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HYDROLOGY (29 journals)

Showing 1 - 30 of 30 Journals sorted by number of followers
Journal of Hydrology     Hybrid Journal   (Followers: 68)
Journal of Hydrology and Meteorology     Open Access   (Followers: 39)
Journal of Contaminant Hydrology     Hybrid Journal   (Followers: 22)
Hydrological Sciences Journal - Journal des Sciences Hydrologiques     Full-text available via subscription   (Followers: 21)
Water Environment and Technology     Hybrid Journal   (Followers: 20)
Journal of Hydrology : Regional Studies     Open Access   (Followers: 20)
Ecohydrology     Hybrid Journal   (Followers: 11)
Bulletin of Marine Science     Full-text available via subscription   (Followers: 9)
Journal of Hydrogeology and Hydrologic Engineering     Hybrid Journal   (Followers: 8)
Hydrology     Open Access   (Followers: 6)
Journal of Limnology     Open Access   (Followers: 6)
International Journal of Hydrology Science and Technology     Hybrid Journal   (Followers: 6)
Water Security     Hybrid Journal   (Followers: 6)
Open Journal of Modern Hydrology     Open Access   (Followers: 5)
Ecohydrology & Hydrobiology     Full-text available via subscription   (Followers: 5)
Journal of Hydrology (New Zealand)     Full-text available via subscription   (Followers: 5)
Journal of Hydrology X     Open Access   (Followers: 5)
Journal of Hydrology and Hydromechanics     Open Access   (Followers: 4)
Anais Hidrográficos     Open Access   (Followers: 4)
Russian Meteorology and Hydrology     Hybrid Journal   (Followers: 3)
Geology, Ecology, and Landscapes     Open Access   (Followers: 2)
Regional Studies in Marine Science     Hybrid Journal   (Followers: 2)
Proceedings of the International Association of Hydrological Sciences     Open Access   (Followers: 2)
Águas Subterrâneas     Open Access   (Followers: 1)
HydroResearch     Open Access   (Followers: 1)
Discover Water     Open Access  
Hydrosphere. Hazard processes and phenomena     Open Access  
International Hydrographic Review     Open Access  
Water Conservation Science and Engineering     Hybrid Journal  
Hidrobiológica     Open Access  
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Journal of Limnology
Journal Prestige (SJR): 0.632
Citation Impact (citeScore): 2
Number of Followers: 6  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1129-5767 - ISSN (Online) 1723-8633
Published by PAGEPress Homepage  [51 journals]
  • Relationships between air temperature and ice conditions on the southern
           Baltic coastal lakes in the context of climate change

    • Authors: Józef Piotr Girjatowicz, Małgorzata Świątek, Halina Kowalewska-Kalkowska
      Abstract: Shallow, lagoonal coastal lakes of the Southern Baltic are exceptionally susceptible to atmospheric factors. This work examines the influence of winter air temperatures in Ustka on ice parameters (dates of first ice occurrence and last ice disappearance, ice season duration, number of days with ice, and maximum ice thickness) on Southern Baltic coastal lakes (Jamno, Bukowo, Gardno, Łebsko), and trends displayed by changes in these parameters over the period spanning 1960/61-2019/20. The research data was retrieved from the archives of Institute of Meteorology and Water Management – National Research Institute. As a first step of the analysis, we investigated the statistical relationships in spatial and temporal variations in winter air temperature and coastal lake ice parameters. Correlation and regression method was employed to determine the influence of air temperature on coastal lake ice conditions. Correlation and determination coefficients were calculated, and linear regression equations were determined. The statistical significance of the observed relationships was assessed using Fisher-Snedecor test. Additionally, linear trend models were constructed. Our analysis indicates that from 1960/61 to 2019/20, the average rate of increase in winter temperature (December-March) in Ustka equalled 0.04°C ⋅year-1. The correlation coefficients for air temperature versus ice parameters were highly statistically significant (p<0.001). The strongest relationships (with correlation coefficients below -0.90) occurred between air temperature and number of days with ice. Ice season duration and number of days with ice are both closely linked with last ice disappearance date and ice thickness. Our analysis shows that a 1°C increase in average seasonal air temperature will result in the number of days with ice on the studied coastal lakes becoming reduced by 16-17 days. All trends in ice parameters indicate a mildening of ice conditions. Most of the assessed trends are statistically significant. The strongest trends were observed for ice season duration, and indicate its shortening toward the east, from 0.66 day ⋅year-1 (Lake Jamno) to 1.16 day ⋅year-1 (Lake Łebsko). All correlation coefficients for ice trends were found to increase eastward, which could be explained by an increasing influence of the warming climate over the Southern Baltic in this direction. The strong relationships between air temperature and Southern Baltic coastal lake ice parameters, and the determined rate of changes may have a significance for forecasting, as the shifting dates of ice formation and disappearance on lakes are highly important for the lake hydrodynamics, and the functioning of aquatic ecosystems.
      PubDate: 2022-04-22
      DOI: 10.4081/jlimnol.2022.2060
      Issue No: Vol. 81, No. 1 (2022)
  • Daily and seasonal dynamics of littoral zone fish communities in the
           lowland Włocławek Reservoir (central Poland), with a special emphasis on
           alien invasive gobies

    • Authors: Maciej Błażejewski, Jarosław Król, Tomasz Kakareko, Katarzyna Mierzejewska, Piotr Hliwa
      Abstract: The aim of the study was to examine the daily and seasonal dynamics of changes in fish communities in two environmentally different littoral zones of the Włocławek Reservoir (central Poland), i.e., the floodplain (limnic Dobiegniewo site) and lotic area (Murzynowo site). During seasonal catches using trawl nets, in the daily cycle (at 00.00, 06.00, 12.00, and 18.00 hours), the presence of 18 fish species representing 4 families (Cyprinidae, Percidae, Gasterosteidae, Gobiidae) was confirmed. In both localities, the domination of native taxa, such as roach Rutilus rutilus (L.) and Eurasian perch Perca fluviatilis L., in Dobiegniewo (26.6 and 26.6%, respectively) and Murzynowo (13.6 and 22.7%, respectively) of all caught specimens was noted. The quantitative share of three alien invasive gobies, racer goby Neogobius gymnotrachelus (Kessler, 1857), monkey goby Neogobius fluviatilis (Pallas, 1814), and western tubenose goby Proterorhinus semilunaris (Heckel, 1837), varied in the range between 2.7 and 35.3% in samples throughout the season. The results indicate the significant role of gobies in the structure of the sublittoral fish communities of Włocławek Reservoir and the necessity of expansion process studies, as well as the observation of the interactions with native fish species in invaded areas.
      PubDate: 2022-04-22
      DOI: 10.4081/jlimnol.2022.2059
      Issue No: Vol. 81, No. 1 (2022)
  • Habitat expansion of a tropical chironomid by seasonal alternation in use
           of littoral and profundal zones

    • Authors: Javier Alcocer, William M. Lewis Jr., María del Carmen Hernández, Luis A. Oseguera, Vania J.J. Pérez, Narcís Prat
      Abstract: The consistent warming of tropical lakes at all depths causes rapid development and long persistence of seasonal hypoxia in the hypolimnion, which greatly reduces the biodiversity of hypolimnetic benthic invertebrates. Full mixing of the water column in a typically annual cool-season creates a benthic habitat suitable for invertebrates but offers little time for colonization before the return of anoxia. In Lake Alchichica, Mexico, the endemic midge Chironomus alchichica has evolved a life cycle consisting of reproduction in waters of the littoral zone, which is suboptimal for development, followed by colonization of the hypolimnetic benthic zone during its oxic phase. As shown by the sampling of both littoral and benthic habitats over an annual cycle, the development of Ch. alchichica in the profundal zone is favoured by minimal competition (only one other invertebrate species present) and no significant predation. The rapid maturation of the midge leads to a high density of pupation before the seasonal anoxia.
      PubDate: 2022-03-10
      DOI: 10.4081/jlimnol.2022.2055
      Issue No: Vol. 81, No. 1 (2022)
  • Complex effects of acidification, habitat properties and fish stock on
           littoral macroinvertebrate assemblages in montane standing waters

    • Authors: Jana Petruželová, Jindřiška Bojková, Jan Sychra, Vanda Šorfová, Vendula Polášková, Jaroslav Vrba
      Abstract: Littoral macroinvertebrates in acidified waterbodies are affected by the interaction of acidification and local environmental conditions. Understanding the interplay of these factors in the structuring of communities is essential for interpreting responses to and/or recovery from acidification. Here, we analyse the species composition and richness of littoral macroinvertebrates in a range of acidified montane standing waters in relation to water chemistry, littoral characteristics and fish stock. The main species composition gradients were related to pH and conductivity; however, considerable variation along these gradients was associated with local habitat characteristics (changing water levels and littoral structure) and concentration of ionic aluminium and dissolved organic carbon. Although fish stock effects were confounded by correlated acidity, we observed a significant decline in abundance of macroinvertebrates vulnerable to fish predation at sites with fish stock. Overall, littoral macroinvertebrates of acidic waterbodies were diverse due to the heterogeneity of local habitat properties, despite they were dominated by acid-tolerant species. Acidic humic sites with dense, heterogeneous littoral vegetation were species-rich, hosting numerous habitat specialists and rare species, while chronically acidified lakes with high aluminium concentrations and sparse littoral vegetation had species-poor assemblages, characteristic of strong acid-stress. Water level manipulation resulted in serious assemblage impoverishment, overriding the effects of more favourable water chemistry. This study shows that the littoral fauna of acidic waterbodies is structured by complex effects induced by local factors in addition to acidity, resulting in acid-stressed assemblages with relatively high variability, emphasising a need to analyse local habitat factors when evaluating the impact of acidification on macroinvertebrates.
      PubDate: 2022-01-11
      DOI: 10.4081/jlimnol.2022.2053
      Issue No: Vol. 81, No. 1 (2022)
  • First ecological analysis of lacustrine testate amoebae in Guatemala: A
           case study from the highland Lake Chichoj

    • Authors: Andrea Eunice Rodas-Moran, Carlos Avendaño, Itzel Sigala, Bessie Evelyn Oliva-Hernandez
      Abstract: Freshwater quality represents a central issue for human populations and the conservation of aquatic communities. In this sense, freshwater reservoirs, such as lakes, require proper management and monitoring plans to avoid their deterioration and pollution. Bioindicators, such as testate amoebae, are an excellent tool increasingly utilized for limnology and paleolimnology to assess the trophic status of lacustrine environments. However, despite their potential as bioindicators, the ecological research status of testate amoebae in Central American lakes remains poor. We conducted our research at highland Lake Chichoj, Alta Verapaz, Guatemala, which has become increasingly eutrophic since the 1980s. This study contributes to fill the knowledge gap about neotropical testate amoebae, parallel to testing their utility as bioindicators of lacustrine conditions. From a collection of 12 surface sediment samples (associated with different land uses), we found 19 testate amoebae taxa, and for the first time in Guatemala, we recorded Arcella megastoma, Arcella gibbosa, Cucurbitella tricuspis, Difflugia protaeiformis strain “acuminata”, Difflugia urceolata strain “elongata”, Lesquereusia spiralis, Lesquereusia modesta, and Mediolus corona. Our cluster analyses revealed three testate amoebae assemblages in connection to trophic conditions: 1) Stressed Conditions (SC), 2) Lowest Contamination Conditions (LC), and 3) Deep Transitional Conditions Assemblage (DT). After performing a transformation-based redundancy analysis (tb-RDA), we found total organic carbon as the only significant environmental parameter associated with testate amoebae assemblages (p<0.004). Our indicator species analysis (IndVal) confirms the eutrophic regime of Lake Chichoj in connection to the presence of Cucurbitella tricuspis and Centropyxis aculeata strain “aculeata” as indicators of nutrient enrichment and stressful conditions. The testate amoebae assemblages identified in Lake Chichoj represent a critical baseline for future studies of Guatemalan lakes, strengthening our understanding of the causal factors behind water quality in neotropical regions.
      PubDate: 2022-11-30
      DOI: 10.4081/jlimnol.2022.2082
      Issue No: Vol. 81 (2022)
  • Changes in and driving factors of the lake area of Huri Chagannao’er
           Lake in Inner Mongolia

    • Authors: Danyang Danyang, Chenhao Li, Lijie Pu, Hugejiletu Hugejiletu, Xiaojing Suo, Ming Zhu, Yalu Zhang, Xiaoqing Wang, Gaili He, Dejing Chen
      Abstract: Inland lakes are an important component of the terrestrial water cycle in Inner Mongolia's typical steppe region, and their variations have far-reaching implications for the sustainable development of water resources in this region. Huri Chagannao'er Lake, one of Inner Mongolia's four major freshwater lakes and the second largest inland lake in the typical steppe region, was chosen as the research object. In this study, the spatiotemporal changes in the area of Huri Chagannao’er Lake over the last 30 years were analyzed using the modified normalized difference water index method and Landsat data. Then, we used regression analysis, correlation analysis, gray relational analysis, and Geodetector to investigate the potential causes of lake area changes. Changes in the lake's water balance, meteorological and climatic changes near the lake, and changes in land use and land cover in the drainage basin are all possible driving factors. Finally, the main driving factors of the lake area change are discussed in conjunction with the literature and field investigation, and measures and suggestions for the lake's sustainable utilization and protection are proposed. The findings revealed that i) from 1988 to 2017, the lake shrank from 98.99 km2 to 29.81 km2, with year 2000 marking the start of the dramatic changes in lake areas; ii) the lake shrinkage was primarily concentrated in the western part of the lake, while the eastern part of the lake remained stable; iii) human activities, such as water interception and storage, as well as excessive exploitation of water resources, were the most significant causes of the dramatic fluctuation in the area of the lake's western part; iv) climate change also had some influence on the lake area changes. The regional climate became warmer and drier, reducing the amount of water entering the drainage basin. The findings of this study highlight the dominant role of human activity intensity in lake area changes and provide a theoretical foundation and technical support for the study of inland lakes in Inner Mongolia's typical steppe region.
      PubDate: 2022-10-26
      DOI: 10.4081/jlimnol.2022.2079
      Issue No: Vol. 81 (2022)
  • Water chemistry and periphyton biomass in the Rideau River: Have
           conditions changed after 24 years'

    • Authors: Lindsay Trottier, John Chételat, Chantal Vis, Paul B. Hamilton, Frances R. Pick, Jesse C. Vermaire
      Abstract: Over the past three decades, the Rideau River (Ontario, Canada) watershed has experienced a land-use change from rural and agricultural land towards urban land, and the introduction and expansion of invasive species. This study examined spatial and temporal patterns of periphyton biomass (chlorophyll-a and ash-free dry mass) collected from riffle zones in 1995 and 2019 along a 66-km stretch of the Rideau River. This study also examined long-term changes in water nutrient and chloride concentrations collected through the Provincial Water Quality Monitoring Network between 2000 and 2018. Declines in total nitrogen between 2000 and 2018 occurred in areas that have not experienced urbanization since the 2000s. In contrast, declines in total phosphorus and increases in chloride between 2000 and 2018 occurred at midstream and downstream sites that have undergone urbanization during the same time period. Conductivity also showed an increase with distance downstream similarly in both 1995 and 2019. Average total phosphorus and total Kjeldahl nitrogen concentrations were lower in 2019 compared to 1995 but did not increase with distance downstream as seen in many river systems, including the Rideau River, in earlier years. Periphyton biomass did not change along the length of the river between 1995 and 2019, despite the declines in nutrient concentrations. These findings highlight the persistence of riverine periphyton in a multi-use watershed experiencing ongoing anthropogenic changes.
      PubDate: 2022-08-04
      DOI: 10.4081/jlimnol.2022.2065
      Issue No: Vol. 81 (2022)
  • Sub-fossil chironomids as indicators of hydrological changes in the
           shallow and high-altitude lake Shen Co, Tibetan Plateau, over the past two

    • Authors: Sonja Rigterink, Paula Echeverría-Galindo, Rodrigo Martínez-Abarca, Julieta Massaferro, Philipp Hoelzmann, Bernd Wünnemann, Andreas Laug, Liseth Pérez, Wengang Kang, Nicole Börner, Anja Schwarz, Ping Peng, Junbo Wang, Liping Zhu, Antje Schwalb
      Abstract: Understanding climate and monsoonal dynamics on the Tibetan Plateau is crucial, as recent hydrological changes, evidenced by rising lake levels, will be accelerated by current global warming and may alter aquatic habitats and species inventories. This study combines chironomid assemblages with sedimentological, mineralogical and geochemical data of a short sediment core (37.5 cm) from the high-altitude (> 4,733 m asl), saline (9 g L-1) and shallow (~5 m water depth) Shen Co, located in the southern part of the central Tibetan Plateau. The predominantly littoral, species-poor (10 chironomid morphotypes) chironomid assemblages are dominated by salt-tolerant taxa, that are highly sensitive to lake level fluctuations and macrophyte vegetation dynamics, making them ideally suited for tracking lake level changes over time. Results indicate a period (from ca. 1830 to 1921 CE) of drier conditions with low runoff and high evaporation rates in the Shen Co catchment, as indicated by a dominance of low-Mg calcite and dolomite and increased Ca/Fe and Sr/Rb ratios. This resulted in a decline in lake levels, an increase in salinity and the periodic occurrence of desiccation events at the sampling site. The first chironomid morphotype to appear after the dry period is Acricotopus indet. morphotype incurvatus, which indicate still low (<2 m) but rising lake levels after 1921 CE due to increasing runoff and a lower evaporation/precipitation ratio, as reflected by coarser grain size, higher quartz content and increased TN, TOC and Al/Si ratios. A replacement of A. indet. morphotype incurvatus by Procladius is observed as lake level rise continued after 1950 CE. The highest lake level is proposed for the period since 2006 CE. From 1955 to 1960 CE and from 2011 to 2018 CE, the presence of the phytophilic taxon Psectrocladius sordidellus-type supported abundant macrophyte growth. These changes are consistent with climate reconstructions from the northern and central Tibetan Plateau, indicating warmer and wetter climate conditions since the beginning of the 20th century, which have led to an increase in lake level in a number of Tibetan lakes. Our study specifically highlights 1920 and 1950 as years with enhanced precipitation. This can be attributed to the strong, with overlapping multidecadal cycles of Westerlies and monsoon systems. This study demonstrates the significance of studying small, shallow lakes, as they frequently contain aquatic communities that respond more rapidly to the changes in the lake system. In addition, this study expands our understanding of the ecology of Tibetan chironomid morphotypes, highlighting this group’s potential as paleolimnological proxies for investigating past environmental and climatic changes.
      PubDate: 2022-07-28
      DOI: 10.4081/jlimnol.2022.2077
      Issue No: Vol. 81 (2022)
  • Larval fish sensitivity to a simulated cold-water pulse varies between
           species and age

    • Authors: Scott Raymond, Jordi Ryall, John Koehn, Ben Fanson, Sarah Hill, Daniel Stoessel, Zeb Tonkin, Joanne Sharley, Charles Todd, Ashlen Campbell, Jarod Lyon, Mark Turner, Brett Ingram
      Abstract: The release of cold-water from hypolimnetic zones of impoundments sharply reduces downstream riverine water temperature. This cold-water pollution (CWP) can extend for hundreds of kilometres, severely challenging the physiological ability of aquatic fauna, particularly ectotherms such as fish, to maintain essential processes such as metabolism, development and growth and survival. The impact of CWP on native fish, especially early life stages, is poorly known. We investigated the effect of a 24-hour exposure to a range of environmentally-related water temperatures (8, 10, 12, 14, 16, 18 and 20°C) on three age-classes (<24-hour-old, 7-day and 14-day-old larvae) of two Australian native fish species: Murray cod (Maccullochella peelii) and Macquarie perch (Macquaria australasica). Overall, larvae of M. peelii were more sensitive to lower water temperatures and hence CWP than M. australasica, indicated by higher rates of equilibrium loss. Larvae of M. peelii were most sensitive to exposure at seven days old whereas M. australasica larvae were most sensitive at <24-h-old. Using our results, we modelled pre- and post-impoundment temperature scenarios and estimated the downstream CWP footprint for both species in an Australian river reach. Larvae of M. peelii were predicted to be absent from the first 26 km of river downstream of the impoundment compared with no impact on the distribution of M. australasica. Managing riverine water temperature below impoundments is fundamental to promoting positive outcomes for endemic fish on not only a local, but global basis. This study emphasises the differential impact of CWP among the critical early life stages and fish species and highlights the urgent need to better manage hypolimnetic water releases to improve downstream river ecosystems.
      PubDate: 2022-07-22
      DOI: 10.4081/jlimnol.2022.2056
      Issue No: Vol. 81 (2022)
  • Identification of aquatic consumer trophic pathways in four volcanic
           tropical lakes using fatty acid biomarkers

    • Authors: Justine R. de Leon, Megumu Fujibayashi, Frances Mikayla Petilla, Bon Ivan Yumul, Milette U. Mendoza-Pascual, Rey Donne S. Papa, Noboru Okuda
      Abstract: Food web studies rely heavily on the use of traditional gut content analysis or the fairly popular stable isotope analysis rather than fatty acid analysis (FAA) despite its straightforward process, and ability to identify and characterize more diverse trophic pathways. In this study, we employed fatty acid (FA) biomarkers as a preliminary attempt to trace and characterize trophic pathways in food webs of four tropical lakes of volcanic origin in Luzon Island, Philippines - three clustered maar lakes (Yambo, Pandin and Calibato) and a large caldera lake (Taal). These lakes have a long history of human disturbance but limited ecological data. Knowledge of basal food sources and existing trophic dynamics of organisms are generally non-existent. Particulate organic matter (POM), zooplankton, and fish species were collected in August 2019 from the study lakes as representative of three trophic guilds. Non-metric multidimensional scaling (NMDS) and principal component analysis (PCA) were conducted to analyse FA profiles and characterize trophic relationships between representative organisms. For the POM, within lakes comparison of taxon-specific FA profiles showed a significant difference between the surface and near bottom depths, with the former dominated by photoautorophs and the latter by chemotrophs, suggesting the ability of FAA to effectively delineate between micro-organisms. Between lakes comparison also showed significant difference between the caldera and maar lakes, with the latter containing higher composition of bacterial FA, reminiscent of the considerably smaller lakes’ response to the impact of unmitigated organic loadings from anthropogenic activities. Taken together with the primary consumers’ FA profiles, analysis confirmed the ability of FAA to discriminate between FA profile sources. PCA explained >70% of the variance in the FA compositions for three trophic guilds in the two deepest lakes, which delineated both zooplankton and fish species food selectivity in each lake, alluding to FAA’s capacity to characterize dietary reliance of various species in an environment with numerous food sources. Although certain limitations were encountered, such as the specificity of the sampling depths for POM, and the small sample size of the representative species of the third trophic level, this study demonstrated the effectiveness of FAA as a powerful ecological tool for disentangling intricate lake food webs comprising various food sources. Overall, this study provided baseline information on basal food sources and trophic pathways of representative organisms from four tropical lakes. Taken together, FAA studies have wide application in understanding food webs, including anthropogenically-threatened lake ecosystems.
      PubDate: 2022-07-19
      DOI: 10.4081/jlimnol.2022.2070
      Issue No: Vol. 81 (2022)
  • Effects of natural surfactants on the spatial variability of surface water
           temperature under intermittent light winds on Lake Geneva

    • Authors: Mehrshad Foroughan, Ulrich Lemmin, David Andrew Barry
      Abstract: The spatial variability of lake surface water temperature (LSWT) between smooth and rough surface areas and its potential association with the natural surfactant distribution in the surface microlayer were investigated for the first time in a lake. In spring 2019, two different field campaigns were carried out in Lake Geneva to measure: i) the enrichment factor of fluorescent dissolved organic matter (FDOM) as a proxy for biogenic surfactants, and ii) LSWT and near-surface water temperature profiles while simultaneously monitoring water surface roughness in both cases. Results indicate that, under intense incoming short-wave radiation and intermittent light wind conditions, the atmospheric boundary layer (ABL) was stable and the accumulation of heat due to short-wave radiation in near-surface waters was greater than heat losses by surface cooling, thus creating a diurnal warm layer with strong thermal stratification in the water near-surface layer. A threshold wind speed of 1.5 m s-1 was determined as a transition between different dynamic regimes. For winds just above 1.5 m s-1, the lake surface became patchy, and smooth surface areas (slicks) were more enriched with FDOM than rough areas (non-slick) covered with gravity-capillary waves (GCW). Sharp thermal boundaries appeared between smooth and rough areas. LSWT in smooth slicks was found to be more than 1.5°C warmer than in rough non-slick areas, which differs from previous observations in oceans that reported a slight temperature reduction inside slicks. Upon the formation of GCW in non-slick areas, the near-surface stratification was destroyed and the surface temperature was reduced. Furthermore, winds above 1.5 m s-1 continuously fragmented slicks causing a rapid spatial redistribution of LSWT patterns mainly aligned with the wind. For wind speeds below 1.5 m s‑1 the surface was smooth, no well-developed GCW were observed, LSWT differences were small, and strong near-surface stratification was established. These results contribute to the understanding and the quantification of air-water exchange processes, which are presently lacking for stable Atmospheric Boundary Layer conditions in lakes.
      PubDate: 2022-07-18
      DOI: 10.4081/jlimnol.2022.2048
      Issue No: Vol. 81 (2022)
  • The first floristic study of freshwater dinoflagellates (Dinophyceae) in

    • Authors: Carolina Bustamante-Gil, Eduardo Amat, Andrés Boltovskoy, John J. Ramírez-Restrepo
      Abstract: The first comprehensive study of dinoflagellate flora and their related environmental variables in reservoirs, swamps, and an insular lake of Colombia is presented. Fourteen Colombian water bodies were assessed. In each, water temperature, electric conductivity, oxygen saturation, turbidity, and apparent color were the physical and chemical variables measured. Twelve dinoflagellate taxa were recorded, indicating a considerable richness compared to similar surveys. Ensembles recovered showed a spatial structuration mediated by the type of the water bodies (reservoirs and swamps); environmental variables and species richness explained equally the differences among the water bodies. The dinoflagellate flora showed altitudinal segregation, with intermediate altitude systems displaying the highest richness values. A brief discussion about the geographical distribution of the species collected is offered. The study contributes to the knowledge of the ecological aspects of dinoflagellate flora and outlines preliminary biodiversity tendencies of ensembles in tropical water systems.
      PubDate: 2021-10-07
      DOI: 10.4081/jlimnol.2021.2023
      Issue No: Vol. 81, No. 1 (2021)
  • Experiments on invertebrate predation on cladocerans and its relationships
           with lake data

    • Authors: Tânia C. dos Santos Ferreira, Marlene S. Arcifa
      Abstract: Until recently, knowledge of the impact of invertebrate predators on cladocerans in the Brazilian Lake Monte Alegre was limited to a few species. In order to assess the effects of predation on other cladoceran species, experiments were carried out with different pair-wise combinations of prey species. The experiments tested predation by fourth instar larvae of the dipteran Chaoborus brasiliensis Theobald on neonates and adults of the cladocerans Daphnia gessneri Herbst, Diaphanosoma birgei Kořínek, and Ceriodaphnia richardi Sars, and predation by the water mite Krendowskia sp. on neonates and adults of C. richardi and D. gessneri. In replicated treatments, the prey was offered alone or in combination with neonates and adults of two species and kept in bottles on a plankton wheel under controlled temperature, photoperiod, and light conditions. Chaoborus larvae preyed on neonates of D. birgei and D. gessneri and on adults of the former species. They preyed preferentially on neonates and adults of D. birgei over neonates and adults of C. richardi. The mite Krendowskia sp. preyed on only one species: neonates and adults of D. gessneri. Data on the distribution and strategies of prey in the lake are discussed in light of the experimental results, in an attempt to establish a link between laboratory data and field conditions.
      PubDate: 2021-10-07
      DOI: 10.4081/jlimnol.2021.1987
      Issue No: Vol. 81, No. 1 (2021)
  • Influence of wastewater discharges on benthic macroinvertebrate
           communities in a cantabrian-atlantic coastal river

    • Authors: David Gutiérrez, Romina Álvarez-Troncoso, Yasmina Martínez-Barciela, Alejandro Polina, Josefina Garrido
      Abstract: This paper studies the effect of wastewater discharges on benthic macroinvertebrates in the Furnia River (Pontevedra, NW Spain). Semiquantitative surveys were carried out in spring 2008 and 2017 in three different locations, upstream and downstream of a sewage treatment plant built in 2013. Different indexes were calculated based on benthic macroinvertebrate assemblages: abundance, richness, Shannon-Wiener, EPT, IASPT, IBMWP and several physicochemical variables were measured concurrently. Although the indexes values decreased slightly along the water course, the results indicate an optimal water quality of the Furnia River, supporting a very diverse community of aquatic macroinvertebrates.
      PubDate: 2021-10-25
      DOI: 10.4081/jlimnol.2021.2014
      Issue No: Vol. 81 (2021)
  • Behavioural responses of juvenile Daphnia magna to two
           organophosphorus insecticides

    • Authors: Valeria Di Nica, Cristiana Rizzi, Antonio Finizio, Lorenzo Ferraro, Sara Villa
      Abstract: In this study, the behaviour of Daphnia magna was studied under equipotent and sub-lethal concentrations of two pesticides congeners: chlorpyrifos (CPF; 5 ng L-1 to 50 ng L-1) and chlorpyrifos-methyl (CPF-m; 30 ng L-1 to 300 ng L-1) with aims to assess and compare the behavioural swimming responses (BSRs) of the cladocerans elicited by both compounds at different concentrations and exposure times. A video tracking analysis after 24 h and 48 h of exposure allowed us to evaluate different behavioural responses (distance moved, average velocity, active time, and average acceleration). The results indicate that BSRs are sensitive indicators of sub-lethal stress. Highly concentration- and time-response changes for both compounds were observed during the experiments. In particular, in the first 24 h of exposure, both compounds elicited a similar decreasing trend in swimming behaviour, in which CPF induced the highest decline. Further, hypoactivity was associated with the narcotic effects of both compounds. Conversely, after 48 h of exposure, we observed an increasing tendency in the swimming parameters, particularly at the highest tested concentrations. However, the compounds did not exhibit the same trend. Rather, CPF-m induced high variations from the control groups. This reversal trend could be due to the activation of compensatory mechanisms, such as feeding, searching, or avoidance behaviours. These results suggest that BSRs are measurable active responses of organisms, which are controlled by time.
      PubDate: 2021-10-07
      DOI: 10.4081/jlimnol.2021.2015
      Issue No: Vol. 81 (2021)
  • Ciliates in different types of pools in temperate, tropical, and polar
           climate zones – implications for climate change

    • Authors: Tomasz Mieczan, Urszula Bronowicka-Mielniczuk
      Abstract: Small water bodies are typically characterized by high diversity of various groups of microorganisms. Moreover, these ecosystems react very quickly to even the slightest climate changes (e.g. a temperature increase or water level fluctuations). Thus far, studies of planktonic ciliates in small water bodies having different origins and located in various climate zones have been scarce. Our study aimed to verify the following hypotheses: planktonic ciliate assemblages exhibit higher diversity in pools with higher concentrations of biogenic compounds; pools in warmer climates have higher biodiversity of planktonic ciliates than those in the polar climate zone; individual functional groups of ciliates demonstrate considerable diversity, both between individual pool types and between climate zones. The study was conducted in 21 small pools in temperate, tropical, and polar climate zones. While the type of pool clearly influenced the makeup of microbial communities, the influence of climate was stronger. The factors with the greatest influence on the occurrence of these microorganisms were temperature, total organic carbon, and nutrients. Our results show that in warmer climates the abundance of bacterivorous ciliates is higher, while that of mixotrophs is lower. This has consequences for modelling of climate change and assessment of its influence on the carbon cycle in small water body ecosystems.
      PubDate: 2021-09-28
      DOI: 10.4081/jlimnol.2021.1997
      Issue No: Vol. 81 (2021)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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