Subjects -> EARTH SCIENCES (Total: 771 journals)
    - EARTH SCIENCES (527 journals)
    - GEOLOGY (94 journals)
    - GEOPHYSICS (33 journals)
    - HYDROLOGY (29 journals)
    - OCEANOGRAPHY (88 journals)

EARTH SCIENCES (527 journals)            First | 1 2 3     

Showing 201 - 371 of 371 Journals sorted alphabetically
Hydrological Processes     Hybrid Journal   (Followers: 44)
Hydrology and Earth System Sciences     Open Access   (Followers: 38)
ICES Journal of Marine Science: Journal du Conseil     Hybrid Journal   (Followers: 53)
IEEE Geoscience and Remote Sensing Letters     Hybrid Journal   (Followers: 151)
IEEE Geoscience and Remote Sensing Magazine     Hybrid Journal   (Followers: 6)
IEEE Journal of Oceanic Engineering     Hybrid Journal   (Followers: 11)
Indian Geotechnical Journal     Hybrid Journal   (Followers: 4)
Indonesian Journal on Geoscience     Open Access   (Followers: 1)
Inland Waters     Hybrid Journal  
Innovative Infrastructure Solutions     Hybrid Journal  
Interdisciplinary Environmental Review     Hybrid Journal   (Followers: 3)
International Geology Review     Hybrid Journal   (Followers: 17)
International Journal of Advanced Geosciences     Open Access   (Followers: 2)
International Journal of Advanced Remote Sensing and GIS     Open Access   (Followers: 50)
International Journal of Applied Earth Observation and Geoinformation     Open Access   (Followers: 36)
International Journal of Coal Geology     Hybrid Journal   (Followers: 2)
International Journal of Disaster Risk Reduction     Hybrid Journal   (Followers: 18)
International Journal of Earth Sciences     Hybrid Journal   (Followers: 37)
International Journal of Earthquake and Impact Engineering     Hybrid Journal   (Followers: 4)
International Journal of Energetic Materials     Full-text available via subscription  
International Journal of Environment and Geoinformatics     Open Access   (Followers: 4)
International Journal of Geo-Engineering     Open Access   (Followers: 2)
International Journal of Geographical Information Science     Hybrid Journal   (Followers: 55)
International Journal of Geomechanics     Full-text available via subscription   (Followers: 6)
International Journal of Geosciences     Open Access   (Followers: 10)
International Journal of Geosynthetics and Ground Engineering     Full-text available via subscription   (Followers: 3)
International Journal of Geotechnical Earthquake Engineering     Full-text available via subscription   (Followers: 9)
International Journal of Image and Data Fusion     Hybrid Journal   (Followers: 3)
International Journal of Remote Sensing     Hybrid Journal   (Followers: 144)
International Journal of Remote Sensing Applications     Open Access   (Followers: 49)
International Journal of Soil, Sediment and Water     Open Access   (Followers: 4)
International Journal of Speleology     Open Access   (Followers: 3)
Iraqi National Journal of Earth Sciences     Open Access  
iScience     Open Access   (Followers: 1)
Island Arc     Hybrid Journal   (Followers: 5)
ISPRS International Journal of Geo-Information     Open Access   (Followers: 5)
Italian Journal of Geosciences     Open Access  
Izvestiya, Atmospheric and Oceanic Physics     Full-text available via subscription   (Followers: 1)
Izvestiya, Physics of the Solid Earth     Hybrid Journal   (Followers: 2)
Jahresberichte und Mitteilungen des Oberrheinischen Geologischen Vereins     Full-text available via subscription   (Followers: 2)
JETP Letters     Hybrid Journal   (Followers: 3)
Journal of Earth Science & Climatic Change     Open Access   (Followers: 14)
Journal of Advances in Modeling Earth Systems     Open Access   (Followers: 5)
Journal of African Earth Sciences     Hybrid Journal   (Followers: 11)
Journal of Analytical and Numerical Methods in Mining Engineering     Open Access  
Journal of Applied Geophysics     Hybrid Journal   (Followers: 15)
Journal of Applied Volcanology     Open Access   (Followers: 7)
Journal of Arid Land     Hybrid Journal  
Journal of Asian Earth Sciences     Hybrid Journal   (Followers: 15)
Journal of Asian Earth Sciences : X     Open Access  
Journal of Atmospheric and Oceanic Technology     Hybrid Journal   (Followers: 33)
Journal of Atmospheric and Solar-Terrestrial Physics     Hybrid Journal   (Followers: 133)
Journal of Big History     Open Access   (Followers: 3)
Journal of Coastal Conservation     Hybrid Journal   (Followers: 6)
Journal of Coastal Research     Hybrid Journal   (Followers: 31)
Journal of Contemporary Physics (Armenian Academy of Sciences)     Hybrid Journal   (Followers: 9)
Journal of Contemporary Water Resource & Education     Hybrid Journal   (Followers: 2)
Journal of Earth Science     Hybrid Journal   (Followers: 12)
Journal of Earth System Science     Open Access   (Followers: 52)
Journal of Earth, Environment and Health Sciences     Open Access   (Followers: 2)
Journal of Earthquake and Tsunami     Hybrid Journal   (Followers: 2)
Journal of Earthquake Engineering     Hybrid Journal   (Followers: 14)
Journal of Environment and Earth Science     Open Access   (Followers: 11)
Journal of Environmental & Engineering Geophysics     Hybrid Journal   (Followers: 2)
Journal of Geodesy     Hybrid Journal   (Followers: 9)
Journal of Geodesy and Geoinformation     Open Access   (Followers: 2)
Journal of Geodynamics     Hybrid Journal   (Followers: 6)
Journal of Geography, Environment and Earth Science International     Open Access  
Journal of Geology     Full-text available via subscription   (Followers: 30)
Journal of Geomorphology     Open Access   (Followers: 3)
Journal of Geophysical Research : Atmospheres     Partially Free   (Followers: 134)
Journal of Geophysical Research : Biogeosciences     Full-text available via subscription   (Followers: 34)
Journal of Geophysical Research : Earth Surface     Partially Free   (Followers: 59)
Journal of Geophysical Research : Oceans     Partially Free   (Followers: 60)
Journal of Geophysical Research : Planets     Full-text available via subscription   (Followers: 116)
Journal of Geophysical Research : Solid Earth     Full-text available via subscription   (Followers: 57)
Journal of Geophysical Research : Space Physics     Full-text available via subscription   (Followers: 136)
Journal of Geophysics and Engineering     Hybrid Journal   (Followers: 2)
Journal of Geoscience Education     Hybrid Journal   (Followers: 1)
Journal of Geoscience, Engineering, Environment, and Technology     Open Access   (Followers: 1)
Journal of Geosciences     Open Access   (Followers: 5)
Journal of Geosciences and Geomatics     Open Access   (Followers: 1)
Journal of Geospatial Applications in Natural Resources     Open Access  
Journal of Geotechnical and Geoenvironmental Engineering     Full-text available via subscription   (Followers: 30)
Journal of Geotechnical Engineering     Full-text available via subscription   (Followers: 4)
Journal of Great Lakes Research     Hybrid Journal   (Followers: 5)
Journal of Hydro-environment Research     Full-text available via subscription   (Followers: 13)
Journal of Hydrologic Engineering     Full-text available via subscription   (Followers: 40)
Journal of International Maritime Safety, Environmental Affairs, and Shipping     Open Access   (Followers: 1)
Journal of Life and Earth Science     Open Access  
Journal of Marine Medical Society     Open Access   (Followers: 1)
Journal of Marine Research     Full-text available via subscription   (Followers: 20)
Journal of Marine Science and Technology     Hybrid Journal   (Followers: 3)
Journal of Marine Systems     Hybrid Journal   (Followers: 9)
Journal of Metamorphic Geology     Hybrid Journal   (Followers: 15)
Journal of Mining Science     Hybrid Journal   (Followers: 2)
Journal of Mountain Science     Hybrid Journal  
Journal of Natural Gas Geoscience     Open Access  
Journal of Ocean and Climate     Open Access   (Followers: 9)
Journal of Oceanology and Limnology     Hybrid Journal   (Followers: 3)
Journal of Petroleum Exploration and Production Technology     Open Access   (Followers: 2)
Journal of Petroleum Science and Engineering     Hybrid Journal   (Followers: 3)
Journal of Petrology     Hybrid Journal   (Followers: 11)
Journal of Plasma Physics     Hybrid Journal   (Followers: 21)
Journal of Population and Sustainability     Open Access  
Journal of Quaternary Science     Hybrid Journal   (Followers: 31)
Journal of Rock Mechanics and Geotechnical Engineering     Open Access   (Followers: 3)
Journal of Sea Research     Hybrid Journal   (Followers: 6)
Journal of Sedimentary Environments     Open Access  
Journal of Seismology     Hybrid Journal   (Followers: 9)
Journal of Spatial Information Science     Open Access   (Followers: 4)
Journal of Structural Geology     Hybrid Journal   (Followers: 26)
Journal of Systematic Palaeontology     Hybrid Journal   (Followers: 7)
Journal of the Atmospheric Sciences     Hybrid Journal   (Followers: 83)
Journal of the Geological Society     Hybrid Journal   (Followers: 17)
Journal of the Royal Society of New Zealand     Hybrid Journal   (Followers: 48)
Journal of the World Aquaculture Society     Hybrid Journal   (Followers: 13)
Journal of Volcanology and Geothermal Research     Hybrid Journal   (Followers: 17)
Journal of Water and Climate Change     Open Access   (Followers: 52)
Journal on Geoinformatics, Nepal     Open Access   (Followers: 2)
Jurnal Ilmiah Perikanan dan Kelautan / Scientific Journal of Fisheries and Marine     Open Access  
Kartografija i geoinformacije (Cartography and Geoinformation)     Open Access  
Lake and Reservoir Management     Hybrid Journal   (Followers: 7)
Landslides     Hybrid Journal   (Followers: 26)
Latin American Journal of Sedimentology and Basin Analysis     Open Access   (Followers: 1)
Lethaia     Hybrid Journal   (Followers: 5)
Letters in Mathematical Physics     Hybrid Journal   (Followers: 4)
Limnologica     Hybrid Journal   (Followers: 4)
Limnology     Hybrid Journal   (Followers: 9)
Lithology and Mineral Resources     Hybrid Journal   (Followers: 3)
Lithos     Hybrid Journal   (Followers: 9)
Malaysian Journal of Geosciences     Open Access  
Marine and Freshwater Research     Hybrid Journal   (Followers: 6)
Marine and Petroleum Geology     Hybrid Journal   (Followers: 21)
Marine Biology Research: New for 2005     Hybrid Journal   (Followers: 2)
Marine Economics and Management     Open Access   (Followers: 3)
Marine Environmental Research     Hybrid Journal   (Followers: 31)
Marine Geodesy     Hybrid Journal   (Followers: 4)
Marine Geology     Hybrid Journal   (Followers: 31)
Marine Geophysical Researches     Hybrid Journal   (Followers: 5)
Marine Georesources & Geotechnology     Hybrid Journal  
Marine Mammal Science     Hybrid Journal   (Followers: 10)
Marine Policy     Hybrid Journal   (Followers: 61)
Mathematical Geosciences     Hybrid Journal   (Followers: 4)
Mathematical Physics, Analysis and Geometry     Hybrid Journal   (Followers: 3)
Mediterranean Geoscience Reviews     Hybrid Journal  
Meteoritics & Planetary Science     Hybrid Journal   (Followers: 18)
Meteorologische Zeitschrift     Full-text available via subscription   (Followers: 4)
Mineralium Deposita     Hybrid Journal   (Followers: 4)
Mineralogia     Open Access   (Followers: 2)
Mineralogy and Petrology     Hybrid Journal   (Followers: 2)
Mineria y Geologia     Open Access  
Mining, Metallurgy & Exploration     Hybrid Journal  
Momona Ethiopian Journal of Science     Open Access   (Followers: 5)
Mongolian Geoscientist     Open Access  
Moscow University Geology Bulletin     Hybrid Journal  
Moscow University Physics Bulletin     Hybrid Journal  
Natural Hazards     Hybrid Journal   (Followers: 53)
Natural Hazards and Earth System Sciences (NHESS)     Open Access   (Followers: 10)
Natural Hazards and Earth System Sciences Discssions     Open Access  
Natural Hazards Research     Open Access  
Natural Hazards Review     Full-text available via subscription   (Followers: 16)
Natural Resources & Engineering     Hybrid Journal  
Natural Resources Research     Hybrid Journal   (Followers: 8)
Nature Geoscience     Full-text available via subscription   (Followers: 162)
Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen     Full-text available via subscription   (Followers: 3)
Neues Jahrbuch für Mineralogie - Abhandlungen     Full-text available via subscription   (Followers: 1)
Newsletters on Stratigraphy     Full-text available via subscription   (Followers: 2)
Nonlinear Processes in Geophysics (NPG)     Open Access  
Nonlinear Processes in Geophysics Discussions     Open Access  
Ocean & Coastal Management     Hybrid Journal   (Followers: 62)
Ocean Development & International Law     Hybrid Journal   (Followers: 15)
Ocean Dynamics     Hybrid Journal   (Followers: 6)
Ocean Engineering     Hybrid Journal   (Followers: 6)
Ocean Modelling     Hybrid Journal   (Followers: 12)
Ocean Science (OS)     Open Access   (Followers: 7)
Ocean Science Journal     Hybrid Journal   (Followers: 6)
Open Geospatial Data, Software and Standards     Open Access   (Followers: 3)
Open Journal of Earthquake Research     Open Access   (Followers: 3)
Open Journal of Soil Science     Open Access   (Followers: 9)
Ore and Energy Resource Geology     Open Access  
Ore Geology Reviews     Hybrid Journal   (Followers: 11)
Organic Geochemistry     Hybrid Journal   (Followers: 4)
Osterreichische Wasser- und Abfallwirtschaft     Hybrid Journal  
Paläontologische Zeitschrift     Hybrid Journal   (Followers: 4)
Papers in Palaeontology     Hybrid Journal  
Permafrost and Periglacial Processes     Hybrid Journal   (Followers: 5)
Perspectives of Earth and Space Scientists i     Open Access   (Followers: 1)
Petroleum Geoscience     Hybrid Journal   (Followers: 5)
Petroleum Science     Open Access  
Petrology     Full-text available via subscription   (Followers: 6)
PFG : Journal of Photogrammetry, Remote Sensing and Geoinformation Science     Hybrid Journal   (Followers: 4)
Photogrammetrie - Fernerkundung - Geoinformation     Full-text available via subscription  
Physical Geography     Hybrid Journal   (Followers: 8)
Physical Science International Journal     Open Access  
Physics of Life Reviews     Hybrid Journal   (Followers: 1)
Physics of Metals and Metallography     Hybrid Journal   (Followers: 18)
Physics of Plasmas     Hybrid Journal   (Followers: 10)
Physics of the Earth and Planetary Interiors     Hybrid Journal   (Followers: 34)
Physics of the Solid State     Hybrid Journal   (Followers: 7)

  First | 1 2 3     

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Journal Cover
Limnology
Journal Prestige (SJR): 0.419
Citation Impact (citeScore): 1
Number of Followers: 9  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1439-863X - ISSN (Online) 1439-8621
Published by Springer-Verlag Homepage  [2469 journals]
  • Stream water acidification in the Far East of Russia under changing
           atmospheric deposition and precipitation patterns

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      Abstract: Abstract Despite the reduction in S and N emissions, acid deposition continues to be a problem for the inland water in Northeast Asia. However, catchment-scale studies on acid deposition in the Asian part of Russia are limited. Based on the long-term data of the Acid Deposition Monitoring Network in East Asia (EANET), we evaluated the effects of acid deposition on the stream water (SW) chemistry in a catchment of the Komarovka River (KMR) located in the Far East of Russia for the period 2005–2019. The SW pH has been decreasing over the last decade, with an increase in acidifying agents, such as SO42– and NO3–. The N/S ratio increased in SW due to a rise in NO3–, which plays a key role in acidification. In contrast, the rainwater pH has been rising at the nearby EANET site. There were transition periods from a decreasing trend to an increasing trend of S and dissolved inorganic nitrogen (DIN) in 2011 and 2014, respectively. Moreover, because of changing precipitation patterns, the contribution of warm season deposition to acidification has increased, which may accelerate the leaching of S and DIN from the forested catchment. The recent increase in S and DIN deposition and increased warm-season precipitation appeared to cause acidification of SW at KMR. The N leaching at KMR was largely influenced by the precipitation patterns, while DIN deposition and forest conditions should be taken into consideration. An interlinkage between air pollution and climate change should be carefully assessed to understand the forested catchment.
      PubDate: 2022-05-11
       
  • Characteristics of streambed morphology at reach and unit scales in a
           sandstone-dominated headstream area of the Kantō Range

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      Abstract: Abstract Headstream areas, which are located in the uppermost reaches of mountain streams, are important sections for investigating the geomorphology of stream channels and their generative mechanisms, because they are close to sediment supply sources and generally suffer little anthropogenic impacts. In this study, the occurrences and characteristics of bed morphologies in a sandstone-dominated headstream area are explored at two scales—reach and unit—which are often overlooked. As a result of field investigations, cascades and step–pools were found to occupy the majority of the stream channel laterally at the reach scale. However, most of the elevation differences were accounted for by fall–pools, cascades, and step–pools, suggesting the importance of bed morphologies with large elevation losses in the headstream area. In addition, the characteristics of the bed morphologies at the reach scale were closely related to the longitudinal profiles of each stream. The mean gradients of the reach-scale bed morphologies were 46.9% for fall–pools, 23.9% for cascades, 16.8% for step–pools, and 5.9% for pool–riffles. At the unit scale, pools occupied the majority of the stream laterally, and > 80% of the elevation differences in all the studied rivers were occupied by falls, bedrock cascades, cascades, and steps. Although there have been no studies on the elevation loss functions and characteristics of falls, this study revealed the importance of fall–pool reaches and fall units in a sandstone-dominated headwater area in the Kantō Range of Japan.
      PubDate: 2022-04-01
       
  • Convection of waters in Lakes Maninjau and Singkarak, tropical oligomictic
           lakes

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      Abstract: Abstract The ecology of a lake is mainly controlled by mixing processes; particularly, in tropical oligomictic lakes, the occurrence frequency and magnitude of convection govern the vertical mixing of chemicals and organisms. In this study, vertical profiles of water temperature, dissolved oxygen, electric conductivity, turbidity, and chlorophyll a were measured in 2014, 2015, 2017, and 2018 in two Sumatran deep lakes, Lakes Maninjau and Singkarak. In Lake Maninjau, intensive surveys on the profiles were also conducted in three different seasons in 2018. The comparison of the profiles between 2015 and 2017 indicated the events of large convection down to the lake bottoms happened in both of the lakes. Similarly, small convection down to around 30 m depth was found in the period between May and Jul, 2018. Air temperature drops up to five degrees centigrade were observed in these periods, confirmed by the changes in lake surface temperature estimated by MODIS imagery for the lakes. The magnitudes of the convective events were discussed with the observed amounts of heat loss and the estimated heat transfer through lake surface. Furthermore, the influences of such events on anoxic hypolimnetic waters were evaluated and considered from the view of climate change.
      PubDate: 2022-04-01
       
  • Abundance estimation of riverine macrophyte Egeria densa using
           environmental DNA: effects of sampling season and location

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      Abstract: Abstract Invasive macrophytes can have a variety of effects on aquatic ecosystems. The early detection and abundance estimation of an invasive species is important to effectively control it and minimize the ecosystem impacts. It is imperative to develop more efficient sampling methods for the abundance quantification of aquatic plants in large riverine systems. We examined (1) relationships between the environmental DNA (eDNA) concentrations of the invasive macrophyte, Egeria densa, and the upstream coverage area on the multiple life-history stages (dormant, growing, and senescence seasons) in a large riverine system in Japan and (2) if the relationships between the eDNA concentrations and coverage area could vary with the lateral sampling locations (left bank, middle, and right bank). The eDNA concentrations had significant positive relationships with the upstream coverage area of E. densa at multiple spatial scales for the dormant and senescence seasons. These results suggest that the eDNA analysis could be useful to quantify the relative abundance of this aquatic macrophyte in the riverine system; however, the selection of the eDNA sampling season could be important to accurately estimate abundance. Our results also showed that the eDNA concentrations of E. densa did not significantly differ from the lateral sampling location, suggesting that the eDNA samples could reflect the relative abundance of E. densa upstream of the study sites regardless of the lateral sampling location.
      PubDate: 2022-04-01
       
  • New data on morphology, distribution, and relationship of two Asian
           endemics Netzelia tuberspinifera and Netzelia mulanensis (Amoebozoa:
           Arcellinida) co-existing in the largest natural freshwater lake of Vietnam
           

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      Abstract: Abstract Data on the distribution and species-environment relationships of rare and endemic species of protists in Asian tropical waterbodies could provide valuable information for better understanding of auto- and synecology of microbes in tropical ecosystems. We studied the morphology, abundance and distribution of two rare endemic species of testate amoebae Netzelia tuberspinifera and Netzelia mulanensis co-existing in Ba Be Lake (Bac Kan province), the largest natural lake of Vietnam. The results of NMDS and ANOSIM analyses showed insignificant difference by measured physicochemical parameters of water between nearshore and open water areas of the lake. Difference of abundances of each studied species between nearshore and open water areas of Ba Be Lake was not statistically significant. Additionally, abundances of N. tuberspinifera and N. mulanensis were weakly and insignificantly correlated at the time of investigation. The relation between environmental parameters and species distribution was investigated using a redundancy analysis (RDA) following forward selection procedure. The first and second RDA axes explained together 67% of the total variance in the data. Forward selection identified that water temperature and turbidity should be retained for the parsimonious RDA model. It is suggested that water turbidity should be considered in the next studies of relation between environmental variables and testate amoeba data. There were statistically significant differences in morphology between Vietnamese and Chinese populations of both investigated species.
      PubDate: 2022-04-01
       
  • Hovenia dulcis Thunb. (Rhamnaceae) invasion in the riparian zone alters
           the dynamics and decomposition of organic matter in subtropical streams,
           but not of associated invertebrate assemblages

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      Abstract: Abstract Stream functioning is affected by allochthonous and autochthonous energy sources, organic matter decomposition and the structure and composition of the aquatic community. The presence of non-native tree species in the riparian zone may affect stream functioning. Thus, we quantified the allochthonous organic matter input to streams from native tree species and Hovenia dulcis, a non-native species, over a year, and we evaluated litter colonization and decomposition by aquatic invertebrates. The input of native organic matter was greater in Winter and Spring. On the other hand, the input of H. dulcis was higher in Autumn. The annual contribution of native organic matter was twofold greater than that of H. dulcis and was correlated with rainfall. H. dulcis leaf litter had decomposition rates that were three- to fourfold greater than those of native leaf litter. The invertebrate abundance and richness, and functional feeding groups did not vary between native and non-native leaf litter. We conclude that the presence of H. dulcis in the riparian zone changed the input patterns of allochthonous organic matter into streams. Furthermore, H. dulcis litter broke down faster than that of native species and did not directly affect the associated invertebrate community. However, the dominance of this species in riparian zones causes homogenisation of environment, resulting in changes in the composition of other biological communities (e.g., fungi and fish).
      PubDate: 2022-01-31
      DOI: 10.1007/s10201-021-00695-7
       
  • Biodiversity, distribution and production of macrozoobenthos communities
           in the saline Chernavka River (Lake Elton basin, South-West Russia)

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      Abstract: Abstract The rise of salinity of inland waters in many regions of the world highlights the necessity of investigations of ecosystems with a naturally high level of salinity to be able to predict possible changes in freshwater under the influence of modern environmental hazards. We studied species composition, density, biomass, and estimated production of macrozoobenthos communities in the middle reach and mouth of the saline Chernavka River (Lake Elton basin, Russia) from October 2018 to September 2019. The salinity of the water varied from 24 to 34 g l−1 during the investigation period. Species richness was poor: only a total of 21 taxa were found during the study period in the Chernavka River. The average density of benthic taxa in the middle reach was 8294 ind. m−2, and in the river mouth, the average density of benthic taxa was 12,893 ind. m−2. Chironomid larvae and Ceratopogonid larvae had high density and biomass in both sites throughout the growing season. Beetle larvae had high density in summer and autumn in the mouth of the river. The production of macrozoobenthos in the middle reach was 57.7 g dry wt m−2 year−1. In the mouth reach, the production was 707.2 g dry wt m−2 year−1. In the middle reach, the greatest contribution to production was made by Palpomyia schmidti, Cricotopus salinophilus, and Ephydra sp. In the mouth reach, Chironomus salinarius, Berosus spp., and C. salinophilus contributed to benthic production the most.
      PubDate: 2022-01-26
      DOI: 10.1007/s10201-021-00692-w
       
  • Biological traits analysis of free-living nematodes as indicators of
           environmental quality at Lake Bacalar, Mexico

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      Abstract: Abstract Free-living nematode distribution, abundance, diversity, and biological traits at Lake Bacalar were evaluated to assess the environmental quality of the water body. Using an Ekman grab, triplicate sediment samples were collected at 15 sampling sites. Nematodes were identified at family and genus levels, while abundance and diversity indices were calculated. Additionally, functional traits were calculated, and a PCA analysis was applied. The nematode fauna was represented by 6 orders, 18 families and 29 genera. Chromadorida had the highest number of taxa (9 genera), followed by Monhysterida (7 genera) and Enoplida (7 genera). Genera richness was higher at coarse sediments, with Simpson index values ranging 3.96−4.60, which were consistent with the Shannon index (H′ > 3 bits. ind−1). The maturity index varied from 2.5 to 3.1, with a higher percentage of cp-3–5 nematodes (> 55%). Multivariate analysis showed three nematode groups, one associated with chlorophyll a, pH, salinity, and silicates, the second group with dissolved oxygen, and organic matter, and a third group related with nutrient content in water. Biological traits showed a dominance of deposit feeders (37%) and epistrate feeders (35%). Nematode body shape was represented by slender (39%), medium plump (31%), while conical tails were dominant (68%) and the body length varied from < 500 to 3000 µm, with dominance of lengths > 500−750 (46%) and > 750−1250 (38%), organisms typical of oligotrophic lakes. Nematode assemblages, water chemical characteristics, mainly nutrient concentrations, and biological traits confirm the oligotrophic conditions at Lake Bacalar.
      PubDate: 2022-01-23
      DOI: 10.1007/s10201-021-00693-9
       
  • Understanding the effects of environmental heterogeneity on the
           morphofunctional structure of the phytoplankton community during the
           hydrological year in an Amazon floodplain lake, Brazil

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      Abstract: Abstract The Amazon floodplains are complex systems influenced by the annual hydrological regime with an effect on the structuring of physical, chemical and biological processes. Thus, we evaluated the relationship of environmental factors with the composition and variation of functional groups based on morphology (MBFG) during the hydrological year in an Amazonian floodplain lake, with monthly sampling (2013 to 2014). We used analysis of variance (ANOVA) and Kruskal–Wallis to show differences in physicochemical variables between hydroperiods. We performed permutation analysis of variance (PERMANOVA) to assess the dissimilarity of morphofunctional groups between hydroperiods and also of environmental data between the months of the study and RDA redundancy analysis to assess the relationship between MBFGs and environmental data. It was registered 101 taxa distributed in eight taxonomic categories and was grouped into 5 MBFGs (III, IV, V, VI and VII), with Chlorophyceae (31 taxa) and Cyanobacteria (27 taxas) with the higher number of taxa. Furthermore, there was a dominance of Cyanobacteria in the total biovolume, which form blooms (MBFGs III and VII) during the periods of falling and low water in lake, influenced mainly by the reduction in the availability of light and an increase in temperature. In another scenario, the dominance of MBFGs V and VI occurred during periods of rising and high water with association with carbon compounds, rainfall, SRP and NO2. Thus, our results demonstrate that the availability of light, the concentration of nutrients and temperature were the most important variables for the morphofunctional structuring of phytoplankton in aquatic system.
      PubDate: 2022-01-09
      DOI: 10.1007/s10201-021-00685-9
       
  • Insect dispersal ability is crucial to overcome limitations in patch
           colonization of Eichhornia crassipes floating meadows

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      Abstract: Abstract Dispersal is a pivotal process in ecology since it determines species presence across patches in landscapes. Therefore, understanding dispersal may be critical in light of current environmental changes. Here, we conducted an experiment to evaluate how richness, density, and β-diversity of insects with strong and/or weak aquatic and aerial dispersal abilities are influenced by colonization limitation of aerial and aquatic patches of a floating macrophyte. We used nets to isolate the aquatic (by roots) and aerial (by leaves) routes by which insects may colonize floating macrophytes. We found that strong aquatic and aerial dispersers were not affected by colonization limitation, since the richness and density of these groups did not decrease with limited colonization. Conversely, limited colonization resulted in a strong decrease in the richness and density of weak aquatic and aerial dispersers. Also, the beta diversity of weak dispersers strongly increased with limited colonization, whereas strong dispersers produced more homogeneous communities (low beta diversity). Our findings illustrate that increasing habitat fragmentation and destruction should have stronger impacts on weak dispersers as they are not able to overcome the habitat scarcity. Consequently, only strong dispersers may persist, leading to high community similarity.
      PubDate: 2022-01-09
      DOI: 10.1007/s10201-021-00688-6
       
  • Biogeochemical characteristics of the Hövsgöl–Ustilimsk water system
           in Mongolia and Russia: the effect of environmental factors on dissolved
           chemical components

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      Abstract: Abstract The objective of this study is to clarify the biogeochemical characteristics of the Hövsgöl–Ustilimsk water system in Mongolia and Russia. For this purpose, we measured dissolved major elements, minor elements, and nutrients in surface water throughout the system. Calcium ions and HCO3 + 2CO3 were the dominant cations and anions in Lake Hövsgöl, respectively. As the water flows down from Lake Hövsgöl to the Egiin Gol and Selenga Rivers in Mongolia, the water quality derived from carbonate rock was found to be influenced by river confluences. In the Selenga River in Russia, major elements were diluted with low-salinity waters from the tributaries. At the boundaries between the Angara River and Bratsk or Ustilimsk Reservoirs, the behaviors of nutrients were affected by the transition of the water area from a riverine zone to a lacustrine zone. Although the composition of cations and anions changes gradually as river water flows further downstream, the water type remains to be Ca–HCO3 throughout the system. Thus, it can be concluded that the fundamental water quality of this system was determined in northern Mongolia, the source area of this water system, and that the environmental factors such as the climate, geology and, geography in its basin from Hövsgöl to Ustilimsk regulated the dissolved chemical components.
      PubDate: 2022-01-03
      DOI: 10.1007/s10201-021-00694-8
       
  • Spatial pattern of freshwater habitats and their prioritization using
           additive partitions of beta diversity of inhabitant piscine assemblages in
           the Terai–Dooars ecoregion of Eastern Himalayas

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      Abstract: Abstract Underlying spatial and habitat attributes of a river network are crucial to comprehend the bio-spatial arrangements within it, the study of which suffers from a paucity of information. Despite several reports on various piscine assemblages, no study contributes to understanding the characteristic attributes of the freshwater habitats of the sub-Himalayan Terai–Dooars ecoregion. Therefore, this study aims to uncover such underlying features through a precise understanding of the spatial profile of freshwater habitats and additive partitions of piscine beta diversity. A significant spatial association is found in the upper stretches of most of these torrential freshwater reaches confined to the eastward of the River Teesta basin to the tributaries of River Jaldhaka. Such a pattern is aligned with a higher local contribution to beta diversity (LCBD) values. The spatial map of LCBD indicates that the mid-altitude (100 > elevation > 2000 m) region contains unique or rare species assemblages. This fact is further confirmed by the spatial aggregation of characteristically adapted hill stream fish species with higher species contribution to beta diversity (SCBD) values. The results are further explained by relevant climatic, topographic, nutrients (sediments), and habitat attributes of which climate, topographic, substrate, and land cover features are the most contributory factors. Such variables are subjected to severe modulation following increasing anthropogenic pressure and changing climatic conditions, leading to the jeopardy of these freshwater habitats. Therefore, prime importance should be accorded to the ecological restoration value of these spatially structured torrential freshwater habitats for conservation and monitoring in the coming days.
      PubDate: 2022-01-01
      DOI: 10.1007/s10201-021-00666-y
       
  • Geographical fine-scaled distributional differentiation caused by niche
           differentiation in three closely related mayflies

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      Abstract: Abstract The distribution area of a species is determined by a combination of factors and since each species of aquatic insect has adapted to drastically changing environments along river channels, they are excellent targets for study. Considering these factors, we focused on three Ephemera mayflies inhabiting the Japanese Archipelago and investigate their niche differentiation patterns. A total of 29 study sites were established within the Asahi-gawa River System to study the relationship between various environmental factors and these mayflies' population structures. From the results of RDA and/or GLMMs, Ephemera japonica tended to distribute in locations with a small degree of canopy openness and a lot of cobbles and boulders. In contrast, Ephemera orientalis tended to distribute in locations with small riverbed slope degree, and small grain size. The distribution area of Ephemera strigata was intermediate between that of E. japonica and E. orientalis. At several study sites, although the distribution patterns appeared irregular due to surrounding environments affected by artificial structures, these patterns can be explained by examining the environmental factors around dams. These results on geographical fine-scaled niche differentiation within a closely related species provide significance knowledge to support understanding of the mechanisms of species coexistence and biodiversity creation.
      PubDate: 2022-01-01
      DOI: 10.1007/s10201-021-00673-z
       
  • Horizontal variability and regulation of bacterial production in Lake
           Biwa, Japan

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      Abstract: Abstract To clarify horizontal variability and regulation of bacterial production (BP), we investigated BP and environmental variables along three east–west transects (lines 12, 15, and 17) covering inshore/offshore stations in Lake Biwa, Japan, during four seasons using 15N-labeled deoxyadenosine for measuring BP. In winter, surface BP along Line 12 (southern transect) was higher than Lines 15 and 17 (central and northern transects) and reflected the water-temperature distribution. Additionally, any nutrients and dissolved organic carbon did not correlate to BP, suggesting water temperature primarily regulated BP in winter. In spring, surface BP was higher at eastern inshore stations, near large agricultural fields, and was correlated with nutrient concentrations rather than water temperature, suggesting that the limitation shifted to nutrient availability. In summer, surface BP at offshore stations along Lines 15 and 17 was notably lower than the other stations, and the horizontal heterogeneity became largest (maximum to minimum BP ratio = 9.5, compared to 2.8 ~ 4.1 in the other seasons). The BP was also positively correlated to nutrient concentrations, especially phosphorus. Surface BP in autumn also showed higher values at eastern stations as well as spring and positively correlated to phosphorus concentration. Additionally, there was a negative relationship between BP and water temperature, suggesting that bacterial growth was enhanced by groundwater seepage at the eastern stations. The results suggest that the horizontal distribution is characterized by a north–south distribution with a temperature gradient in winter, and allochthonous nutrient loading determines horizontal BP variations in the other seasons in this lake.
      PubDate: 2021-11-18
      DOI: 10.1007/s10201-021-00687-7
       
  • Interstitial water chemistry and soil particles determine vegetation in
           Ozegahara Mire, Japan

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      Abstract: Abstract The importance of pore water chemistry for the peatland vegetation was closely examined in Ozegahara mire, Japan. Along a transect from a riverside to the center of mire, dominant vegetation changed in an almost decreasing order of plant height: gallery forest, skunk cabbage, reed, sasa-bamboo, Moliniopsis japonica, and sphagnum, with sporadic appearance of cinnamon fern (Osmunda cinnamomea) with heights of around 100 cm along the way. It was found that these vegetations had different (Ca2+  + Mg2+) concentration in peat interstitial waters and ash content in peat, respectively (p < 0.05), suggesting a close association of the vegetation types with each physicochemical environment. Most of the sites along the transect were found to be ombrotrophic, on the basis of the groundwater tables much higher than the river surface (up to 6.0 m) and SiO2 concentrations in peat interstitial waters (2.4 ± 0.9 mg/L) that were only around one-tenth of that in the river. Nevertheless, the analysis of ash content in peat demonstrated that soil particles had been transported through river overflows to the mire, especially in the cinnamon fern sites, which had ash contents more than 50% in deeper layers (15–20 cm and 20–25 cm). It was found that SiO2, Ca2+, Mg2+, and K+ concentrations in peat interstitial waters were significantly correlated with fine-sand contents in peat sampled at 5–10 cm depth (p < 0.05). In addition, plant heights showed significant positive correlations with both K+ and Ca2+ concentrations (p < 0.05). The results suggest that, in this mire where is mostly ombrotrophic, soil particles derived from flooding would serve as an important mineral source to affect the vegetation type.
      PubDate: 2021-11-03
      DOI: 10.1007/s10201-021-00682-y
       
  • Benthic macroinvertebrate assemblages detect the consequences of a sewage
           spill: a case study of a South American environmental challenge

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      Abstract: Abstract Benthic macroinvertebrate assemblages are used to assess anthropogenic stressors and pressures globally—although considerable spatial and temporal variability in those assemblages occur naturally and in their sampling. We evaluated the effects of an untreated domestic sewage spill on the spatial–temporal occurrence, structure and dynamics of benthic macroinvertebrate assemblages, through use of occupancy probability and time series modelling. Our study produced three key results: (1) Site colonization, extirpation, and occupancy probabilities of resistant and sensitive assemblages were not influenced by the predictor variables measured before and after the spill nor between sites. (2) Over time, site occupancy for the proportion of sensitive taxa increased while the proportion of resistant taxa decreased. (3) Artificial substrates reduced natural variability more than Surber sampling of natural substrates, but macroinvertebrate family richness differed over time regardless of sampling device. We conclude that rigorous monitoring and data analyses of benthic bioindicators can be a cost-effective approach for assessing the biotic effects of sewage discharges on neotropical urban streams.
      PubDate: 2021-10-09
      DOI: 10.1007/s10201-021-00680-0
       
  • Hydrography of Crater Lake of Isabel Island, Nayarit, México

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      Abstract: Abstract An observational campaign was carried out in the hypersaline Crater Lake of Isabel Island to explain the main factors of its hydrodynamics. Wind, temperature and relative humidity time series data were obtained from a weather station installed on the island, sea level atmospheric pressure data were obtained from North American Regional Reanalysis data from which, the seasonal pattern and diurnal breezes can be observed. CTD (Conductivity, Temperature, Depth device) surveys were conducted to analyze the hydrography, and a spectral analysis of temperature time series derived from a chain of thermistors anchored inside the volcanic lake was performed. The results show that the maximum temperature is found not in the first layers of water but at a depth of 1.8 m at 37.9 °C; while from 4 m of depth to the bottom, the temperature remains constant at 27 °C. The lower density water from rain flows into the lake, covering the surface layer of the lake and maintaining this temperature profile. The thermal changes in the first three meters of depth are due to the atmospheric influence and diurnal solar radiation and some strong wind events. To confirm this information, a calculation of heat fluxes through the lake surface was performed. Changes at greater depths are a consequence of the variations in the seasonal effects on the water column.
      PubDate: 2021-10-07
      DOI: 10.1007/s10201-021-00678-8
       
  • Pre-centrifugation before DNA extraction mitigates extraction efficiency
           reduction of environmental DNA caused by the preservative solution
           (benzalkonium chloride) remaining in the filters

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      Abstract: Abstract In the biomonitoring using environmental DNA (eDNA) analysis, the suppression of eDNA degradation has been an important issue to estimate accurately the presence of target species and their eDNA concentrations. A recently proposed eDNA preservation technique requires only the addition of benzalkonium chloride (BAC) to water samples and has been used for various studies as an alternative solution to on-site filtration. However, BAC remaining in filters may adsorb to and inhibit the function of the enzyme used to extract eDNA from filters. In this study, we tested whether eDNA yield is affected by BAC addition immediately before filtration and demonstrated that the BAC in water remaining in filters decreased the eDNA yield significantly. We found that simple pre-centrifugation is effective for removing the remaining water from the filters to prevent the eDNA yield reduction due to the use of BAC. This is the most important finding in the present study. Appropriate eDNA extraction techniques are needed when BAC is used to secure eDNA yields and expand the application of eDNA analysis for biomonitoring.
      PubDate: 2021-09-17
      DOI: 10.1007/s10201-021-00676-w
       
  • Biomonitoring of freshwater lentic habitats using desmids

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      Abstract: Abstract Freshwater ponds besides being a source of potable water, also serve as a habitat for a range of aquatic organisms. The quality of the pond water is dependent on several interrelated parameters like physical, chemical and biological factors which render the water source either fit or unfit for consumption. In this communication, we have discussed the utilization of the desmids flora in assessing the water quality by comparing diversity indices with physical and chemical parameters of the habitat. Further, based on the Shannon–Wiener diversity index, the sites were classified as oligotrophic, mesotrophic and eutrophic. About 46 species of desmids were studied from five study sites, out of which seven are new records to India. The genera with the largest number of species were Cosmarium, Micrasterias, Closterium and Staurastrum with 12, 6, 5, and 4 species, respectively. Further, statistical analysis reveals that Netrium digitus, Closterium acerosum, C. setaceum, Cosmarium circulare, and C. quadrum var minus could be utilized as indicator species of the eutrophic lentic ecosystems. The results justify that the analysis of the desmid species richness and dominance in the aquatic habitats could aid as a potential biomonitoring tool for the conservation of the freshwater habitats.
      PubDate: 2021-08-18
      DOI: 10.1007/s10201-021-00664-0
       
  • Differential use of trophic resources between an exotic and a coexisting
           native snail

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      Abstract: Abstract Knowing the interactions between exotic and native species is essential to establish possible threats to the local fauna. In this study, we assessed the use of food resources and diet overlap between a recently introduced snail, Sinotaia quadrata, and a native species, Pomacea canaliculata. We analyzed the gut content and stable isotope of snails and resources in a lowland stream where both species coexist. Both Schoener’s and isotope dietary overlap indexes supported dietary overlap. Conversely, gut content analysis showed differences in consumption: S. quadrata consumed more detritus and diatoms than P. canaliculata, whose diet was characterized by detritus and macrophyte remains. Macrophytes were the resource that most contributed to the diet of both species, as shown by stable isotope mixing models. The combination of both techniques, gut content and stable isotope analysis, indicated that S. quadrata consumed macrophyte detritus while P. canaliculata ate fresh macrophytes. This difference indicates differential use of food resources between the studied species coexisting in a lowland stream. Although no negative trophic interaction was found, we highlight the importance of continuing to monitor interactions for other resources and studying possible risks to the local fauna.
      PubDate: 2021-08-11
      DOI: 10.1007/s10201-021-00671-1
       
 
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