Subjects -> BIOLOGY (Total: 3174 journals)
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BIOLOGY (1491 journals)            First | 1 2 3 4 5 6 7 8 | Last

Showing 401 - 600 of 1720 Journals sorted alphabetically
Cryoletters     Full-text available via subscription   (Followers: 4)
Cuadernos de Neuropsicología     Open Access   (Followers: 1)
Current Applied Science and Technology     Open Access  
Current Bioinformatics     Hybrid Journal   (Followers: 13)
Current Biology     Full-text available via subscription   (Followers: 226)
Current Genomics     Hybrid Journal   (Followers: 8)
Current Landscape Ecology Reports     Hybrid Journal   (Followers: 2)
Current Medical Science     Hybrid Journal   (Followers: 1)
Current Molecular Medicine     Hybrid Journal   (Followers: 3)
Current Opinion in Cell Biology     Hybrid Journal   (Followers: 51)
Current Opinion in Molecular Therapeutics     Full-text available via subscription   (Followers: 8)
Current Opinion in Neurobiology     Hybrid Journal   (Followers: 32)
Current Opinion in Structural Biology     Hybrid Journal   (Followers: 26)
Current Opinion in Systems Biology     Hybrid Journal   (Followers: 2)
Current Pharmacogenomics and Personalized Medicine     Hybrid Journal   (Followers: 3)
Current Protein and Peptide Science     Hybrid Journal   (Followers: 8)
Current Proteomics     Hybrid Journal   (Followers: 4)
Current Protocols in Bioinformatics     Hybrid Journal   (Followers: 1)
Current Protocols in Cell Biology     Hybrid Journal  
Current Protocols in Molecular Biology     Hybrid Journal  
Current Protocols in Mouse Biology     Hybrid Journal  
Current Protocols in Neuroscience     Hybrid Journal  
Current Protocols in Plant Biology     Hybrid Journal   (Followers: 2)
Current Protocols in Protein Science     Hybrid Journal   (Followers: 1)
Current Protocols in Stem Cell Biology     Hybrid Journal  
Current Research in Bacteriology     Open Access   (Followers: 3)
Current Research in Biostatistics     Open Access   (Followers: 8)
Current Research in Chemical Biology     Open Access  
Current Research in Neurobiology     Open Access  
Current Research in Parasitology & Vector-Borne Diseases     Open Access  
Current Research in Structural Biology     Open Access  
Current Research in Translational Medicine     Full-text available via subscription   (Followers: 1)
Current Research in Virological Science     Open Access   (Followers: 2)
Current Science     Open Access   (Followers: 115)
Current Stem Cell Reports     Hybrid Journal   (Followers: 4)
Current Stem Cell Research & Therapy     Hybrid Journal   (Followers: 8)
Current Topics in Developmental Biology     Full-text available via subscription   (Followers: 3)
Current Topics in Membranes     Full-text available via subscription   (Followers: 1)
Cytotechnology     Hybrid Journal   (Followers: 11)
Database : The Journal of Biological Databases and Curation     Open Access   (Followers: 10)
Dendrochronologia     Hybrid Journal   (Followers: 1)
Developing World Bioethics     Hybrid Journal   (Followers: 6)
Developmental & Comparative Immunology     Hybrid Journal   (Followers: 5)
Developmental Biology     Hybrid Journal   (Followers: 26)
Developmental Cell     Full-text available via subscription   (Followers: 46)
Developmental Dynamics     Hybrid Journal   (Followers: 4)
Developmental Neurobiology     Hybrid Journal   (Followers: 6)
Dhaka University Journal of Biological Sciences     Open Access  
Diatom Research     Hybrid Journal   (Followers: 3)
Differentiation     Hybrid Journal  
Digital Biomarkers     Open Access   (Followers: 1)
Disease Models and Mechanisms     Open Access   (Followers: 1)
Diseases of Aquatic Organisms     Hybrid Journal  
DNA and Cell Biology     Hybrid Journal   (Followers: 9)
DNA Repair     Hybrid Journal   (Followers: 3)
DNA Research     Open Access   (Followers: 4)
Doklady Physics     Hybrid Journal   (Followers: 1)
Drug Discovery Today: Technologies     Full-text available via subscription   (Followers: 13)
Drug Resistance Updates     Hybrid Journal   (Followers: 3)
e-Jurnal Rekayasa dan Teknologi Budidaya Perairan     Open Access  
Ecocycles     Open Access   (Followers: 4)
Ecohydrology & Hydrobiology     Full-text available via subscription   (Followers: 4)
Ecología en Bolivia     Open Access  
Ecological Engineering     Hybrid Journal   (Followers: 4)
Ecological Questions     Open Access   (Followers: 5)
Ecological Solutions and Evidence     Open Access   (Followers: 1)
Ecology and Society     Open Access   (Followers: 50)
Ecology Letters     Hybrid Journal   (Followers: 245)
Economics & Human Biology     Hybrid Journal   (Followers: 1)
Ecoprint : An International Journal of Ecology     Open Access   (Followers: 4)
Ecoscience     Hybrid Journal   (Followers: 2)
Ecosystem Health and Sustainability     Open Access   (Followers: 1)
Ecosystems and People     Open Access   (Followers: 2)
Educational Technology Research and Development     Partially Free   (Followers: 45)
EDUSAINS     Open Access  
EFB Bioeconomy Journal     Open Access  
Egyptian Journal of Basic and Applied Sciences     Open Access  
Egyptian Journal of Biology     Open Access  
Egyptian Journal of Natural History     Open Access   (Followers: 1)
EJNMMI Research     Open Access  
Ekologia     Open Access  
el-Hayah     Open Access  
Electromagnetic Biology and Medicine     Hybrid Journal  
eLife     Open Access   (Followers: 95)
Embo Molecular Medicine     Open Access   (Followers: 10)
EMBO reports     Full-text available via subscription   (Followers: 23)
Emotion Review     Hybrid Journal   (Followers: 20)
Endangered Species Research     Open Access   (Followers: 6)
Endocrine Connections     Open Access   (Followers: 4)
Endothelium: Journal of Endothelial Cell Research     Full-text available via subscription   (Followers: 3)
Engineering & Technology     Hybrid Journal   (Followers: 22)
Engineering Economist, The     Hybrid Journal   (Followers: 4)
Engineering in Life Sciences     Hybrid Journal   (Followers: 3)
Engineering Optimization     Hybrid Journal   (Followers: 19)
Ensaios e Ciência : Ciências Biológicas, Agrárias e da Saúde     Open Access  
Environmental Biology of Fishes     Hybrid Journal   (Followers: 4)
Environmental DNA     Open Access  
Environmental Dynamics and Global Climate Change     Open Access   (Followers: 21)
Environmental Epigenetics     Open Access   (Followers: 2)
Environmental Microbiology     Hybrid Journal   (Followers: 27)
Environmental Microbiome     Open Access  
Environmental Science & Technology     Hybrid Journal   (Followers: 180)
Enzyme and Microbial Technology     Hybrid Journal   (Followers: 12)
Enzyme Research     Open Access   (Followers: 4)
Epidemiology & Infection     Open Access   (Followers: 23)
Epigenomes     Open Access  
EPMA Journal     Open Access  
Ethiopian Journal of Biological Sciences     Open Access   (Followers: 3)
Ethnobiology and Conservation     Open Access   (Followers: 3)
Ethnobiology Letters     Open Access  
Ethnobotany Research & Applications : a journal of plants, people and applied research     Open Access   (Followers: 2)
Ethnoscientia : Brazilian Journal of Ethnobiology and Ethnoecology     Open Access  
Ethology     Hybrid Journal   (Followers: 11)
Ethology Ecology & Evolution     Hybrid Journal   (Followers: 16)
EuPA Open Proteomics     Open Access   (Followers: 2)
EUREKA : Life Sciences     Open Access  
European Journal of Biological Research     Open Access   (Followers: 1)
European Journal of Biology     Open Access   (Followers: 1)
European Journal of Cell Biology     Hybrid Journal   (Followers: 6)
European Journal of Ecology     Open Access   (Followers: 1)
European Journal of Neuroscience     Hybrid Journal   (Followers: 36)
European Journal of Obstetrics & Gynecology and Reproductive Biology     Hybrid Journal   (Followers: 19)
European Journal of Obstetrics & Gynecology and Reproductive Biology : X     Open Access  
European Journal of Phycology     Hybrid Journal   (Followers: 4)
European Journal of Protistology     Hybrid Journal   (Followers: 5)
European Journal of Soil Biology     Hybrid Journal   (Followers: 3)
European Online Journal of Natural and Social Sciences     Open Access   (Followers: 4)
European Scientific Journal     Open Access   (Followers: 1)
Evidência - Ciência e Biotecnologia - Interdisciplinar     Open Access  
EvoDevo     Open Access   (Followers: 4)
Evolution     Partially Free   (Followers: 129)
Evolution and Human Behavior     Hybrid Journal   (Followers: 22)
Evolution Letters     Open Access   (Followers: 8)
Evolutionary Applications     Open Access   (Followers: 6)
Evolutionary Bioinformatics     Open Access   (Followers: 12)
Evolutionary Biology     Hybrid Journal   (Followers: 25)
Evolutionary Computation     Hybrid Journal   (Followers: 11)
Evolutionary Systematics     Open Access   (Followers: 2)
EXCLI Journal : Experimental and Clinical Sciences     Open Access  
Experimental & Molecular Medicine     Open Access  
Experimental and Applied Acarology     Hybrid Journal   (Followers: 1)
Experimental Parasitology     Hybrid Journal   (Followers: 1)
Expert Opinion on Biological Therapy     Hybrid Journal   (Followers: 4)
Expert Opinion on Environmental Biology     Hybrid Journal  
Expert Review of Proteomics     Hybrid Journal   (Followers: 4)
ExRNA     Open Access  
Extreme Life, Biospeology & Astrobiology - International Journal of the Bioflux Society     Full-text available via subscription   (Followers: 4)
Extremophiles     Hybrid Journal   (Followers: 1)
F&S Science : Official journal of the American Society for Reproductive Medicine     Open Access  
Facta Universitatis, Series : Medicine and Biology     Open Access  
Familial Cancer     Hybrid Journal   (Followers: 2)
FASEB BioAdvances     Open Access  
Fauna Norvegica     Open Access  
Fauna of New Zealand     Open Access  
Febs Journal     Hybrid Journal   (Followers: 29)
Feddes Repertorium     Hybrid Journal  
Fems Yeast Research     Hybrid Journal   (Followers: 11)
FIGEMPA : Investigación y Desarrollo     Open Access   (Followers: 1)
Fire Ecology     Open Access   (Followers: 2)
Fish & Shellfish Immunology     Hybrid Journal   (Followers: 10)
Fish and Shellfish Immunology Reports     Open Access   (Followers: 1)
Fishes     Open Access  
Fitoterapia     Hybrid Journal   (Followers: 4)
Florea : Jurnal Biologi dan Pembelajarannya     Open Access  
Fly     Full-text available via subscription  
Folia Biologica     Free   (Followers: 1)
Folia Histochemica et Cytobiologica     Open Access  
Folia Microbiologica     Hybrid Journal   (Followers: 2)
Folia Primatologica     Full-text available via subscription   (Followers: 4)
Food and Bioproducts Processing     Hybrid Journal   (Followers: 3)
Food and Ecological Systems Modelling Journal     Open Access  
Food and Waterborne Parasitology     Open Access  
Food Webs     Hybrid Journal   (Followers: 1)
Forensic Genomics     Full-text available via subscription   (Followers: 2)
Forest Pathology     Hybrid Journal   (Followers: 1)
Forschung     Hybrid Journal   (Followers: 1)
Foundations of Physics     Hybrid Journal   (Followers: 40)
Free Radical Biology and Medicine     Hybrid Journal   (Followers: 6)
Free Radical Research     Hybrid Journal   (Followers: 2)
Freshwater Science     Full-text available via subscription   (Followers: 14)
Frontiers in Ecology and Evolution     Open Access   (Followers: 45)
Frontiers in Evolutionary Neuroscience     Open Access   (Followers: 7)
Frontiers in Life Science     Hybrid Journal   (Followers: 1)
Frontiers in Marine Science     Open Access   (Followers: 13)
Frontiers in Network Physiology     Open Access   (Followers: 2)
Frontiers in Neurogenesis     Open Access   (Followers: 2)
Frontiers in Neuroprosthetics     Open Access   (Followers: 6)
Frontiers of Biogeography     Open Access   (Followers: 4)
Frontiers of Biology     Hybrid Journal   (Followers: 2)
Frontiers of Environmental Science & Engineering     Hybrid Journal   (Followers: 3)
Frontiers of Medical and Biological Engineering     Hybrid Journal  
Functional & Integrative Genomics     Hybrid Journal   (Followers: 7)
Fundamental and Applied Limnology / Archiv für Hydrobiologie     Full-text available via subscription   (Followers: 3)
Fundamental Research     Open Access  
Fungal Biology     Hybrid Journal   (Followers: 6)
Fungal Biology and Biotechnology     Open Access   (Followers: 2)
Fungal Biology Reviews     Full-text available via subscription   (Followers: 9)
Fungal Diversity     Hybrid Journal   (Followers: 2)
Fungal Ecology     Hybrid Journal   (Followers: 6)
Fungal Genetics Reports     Open Access  

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Similar Journals
Journal Cover
Environmental Biology of Fishes
Journal Prestige (SJR): 0.722
Citation Impact (citeScore): 1
Number of Followers: 4  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1573-5133 - ISSN (Online) 0378-1909
Published by Springer-Verlag Homepage  [2469 journals]
  • Anthropogenic structures influence small-fish movement in wetlands

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      Abstract: Abstract Addition of canals and levees to wetlands is common in hydrological management. Permanently flooded canals provide fishes with refuge from desiccation and corridors for long-distance movement, but also may present high risk of predation. Levees create barriers to movement. We evaluated the effect of canals and levees on the movement of fish in seasonally fluctuating marshes in Everglades National Park between 2003 and 2016. We used directional traps to quantify activity and directional movement of seven species of fishes moving through marshes near canals and levees, and farther into the wetland. Eastern mosquitofish (Gambusia holbrooki) were ubiquitous, were active at all sites throughout the year, and moved towards canals consistent with their use as refuge habitat. Sailfin mollies (Poecilia latipinna) and bluefin killifish (Lucania goodei) were also likely to swim towards canals as water levels dropped in the dry season. Flagfish (Jordanella floridae), golden topminnows (Fundulus chrysotus), and marsh killifish (F. confluentus) used wetlands associated with anthropogenic structures but showed no directional bias with respect to canals and these species did not appear to use them as a drought refuge. Non-native African Jewelfish (Hemichromis letourneauxi) displayed directed movement related to canals, but were most active at sites distant from canals. This study provides evidence for interspecific differences among seven fishes in how they move through a marsh near different anthropogenic structures and in different seasons of the hydrologic year. Modification of wetland landscapes with structures has implications for species sorting and metacommunity dynamics filtered by species-specific behavioral traits. Monitoring efforts like this support understanding how important members of the community, like small fishes, respond to environmental and anthropogenic factors that are subject to management decisions.
      PubDate: 2022-05-14
       
  • Tidal and diel effects on the movement and space use of bull sharks
           (Carcharhinus leucas) and bonnetheads (Sphyrna tiburo) in a Florida
           Estuary

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      Abstract: Large estuaries are often highly productive and biodiverse areas of ecological and economical significance. Assessing the movement behavior and space use patterns of mobile organisms in these highly dynamic areas is critical for understanding ecological dynamics within systems. Fine-scale movement data, which is useful for successful species management and conservation, is lacking for ecologically relevant species in many estuarine systems, due to the demands for fine-scale data collection methods and increased use of more passive tracking methods. Six bonnetheads (Sphyrna tiburo) and four bull sharks (Carcharhinus leucas) were tracked within the Apalachicola Bay system using active acoustic telemetry for periods up to 52 h to compare space use patterns and rates of movement across tidal and diel cycles. Tidal and diel periods had significant effects on the rate of movement (ROM) of both species, with increased ROM during crepuscular periods. Movement behavior was likely driven by a combination of optimal foraging strategies, predator avoidance, and abiotic factors. Unique movement behaviors exhibited by mature bonnetheads provide clarity for their high bycatch rates in the Gulf of Mexico shrimp trawl and should be considered during the formulation of conservation and management measures for the species. By comparing simultaneous active and passive acoustic telemetry data from bonnetheads, we determined that ROM has a negative effect on passive acoustic detection success. More investigation into the effects of environmental conditions and movement on detection efficiency is needed as passive telemetry becomes more widely used to study aquatic animal movement.
      PubDate: 2022-05-07
       
  • Do reef fish assemblages benefit from a marine protected area in the north
           Pacific coast of Costa Rica'

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      Abstract: Abstract Reef fish assemblages under fishing pressure generally exhibit a lower fish biomass, abundance, and size structure, which can be counteracted with the creation of marine protected areas (MPAs). The effectiveness of MPAs relies on enforcement and compliance, which is particularly challenging in developing countries with financial and socioeconomic limitations. By combining underwater visual surveys (UVS) and baited remote underwater video stations (BRUVS), we determined the abundance, size distribution, and biomass of economic (e.g., target and ornamental species) and ecological (e.g., small/large predators and herbivorous) indicator fish groups inside and outside a no-take MPA from the north Pacific coast of Costa Rica. The biomass of economic fish groups was not affected by protection, yet overall abundance and size distribution of fishes differed between no-take and open-fishing zones. These results suggest that although illegal fishing may be occurring inside the MPA, there are at least partial benefits of protection on particular groups within the fish assemblage. Herbivores and ornamental fishes, two groups that are targeted by the artisanal compressor fishery and by the aquarium trade, respectively, had higher biomass and were more abundant inside the no-take MPA. Additionally, large shark species (e.g., Galeocerdo cuvier, Carcharhinus leucas, C. limbatus) were only present inside the MPA. Habitat quality was particularly important for ornamental fishes which showed higher biomass in areas with high coral cover. Our study adds to a growing body of evidence suggesting that, even with limited enforcement, MPAs still provide ecological benefits for reef fish assemblages.
      PubDate: 2022-05-06
       
  • Records of bentfin devil ray, Mobula thurstoni, in a marine protected area
           in Brazilian Equatorial Atlantic: implications for the species’
           distribution and local conservation strategies

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      Abstract: Abstract The bentfin devil ray (Mobula thurstoni) is a migratory elasmobranch species with a wide distribution range. Despite the recent increase in mobulid research, critical habitats and home ranges are still being identified for these threatened species. In the present study, photo and video records opportunistically gathered by SCUBA diving effort were used to identify individuals and habitat usage by M. thurstoni in a marine protected area in the western equatorial Atlantic Ocean, Fernando de Noronha Archipelago (FNA). The bentfin devil ray was identified in five distinct records, in different years and sites around the archipelago. All the males showed developed claspers, suggesting mature individuals using the area. The UNESCO heritage site of FNA is considered an area of high biological importance, containing essential habitats for several species of fish, turtles and marine mammals. However, habitat usage by devil ray species is poorly reported in the region; therefore, the present study presents the first report of M. thurstoni at FNA, which adds the fifth mobulid ray species recorded in the region. Additionally, these results correspond to the second record of living specimens of M. thurstoni in Brazilian jurisdictional waters, highlighting new information on the species’ distribution and the home range of mobulids in Brazil.
      PubDate: 2022-05-05
       
  • The interrelationship of temperature, growth parameters, and activity
           level in fishes

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      Abstract: Abstract This study presents a multiple regression of the parameter K, i.e., the rate at which the asymptote of the von Bertalanffy Growth Function (VBGF) is approached vs. the asymptotic weight (W∞), environmental temperature (T’), and an index of activity level (the aspect ratio of the caudal fin, or A) in 4251 populations and 1155 fish species extracted from FishBase (www.fishbase.org). The resulting model was log(K) = 3.674 − 0.2362·log(W∞) − 1.035·T’ + 0.2838·log(A), with K in year−1, W∞ in g, and T’ = −1000/Kelvin. It explained 57 % of the variance in the dataset, with all partial slopes significantly different from zero (p < 0.01), and having the expected signs. Thus, temperature decreases the asymptotic size of fish, but increases their parameter K, and thus decreases traits associated with K, e.g., longevity. Also, our model suggests that A, which take values around 1 in less active fish such as groupers and 8–9 in active swimmers such as tuna, correlates with K values. This implies that active fish have large gill areas supplying the oxygen required for both a high level of activity and rapid growth, both supported by a high feeding rate, which is what we know of these fishes.
      PubDate: 2022-05-04
       
  • Puddingwife wrasse: an important trophic link of an isolated oceanic
           island in Brazil

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      Abstract: Abstract Invertivorous fish species such as Halichoeres radiatus feed on benthic active prey and need to spend most of their time foraging. Even though the Labridae family is one of the most speciose in reef environments, the knowledge on feeding habits and behavior of this group continues being a major topic on trophic ecology. The present work aimed to evaluate the feeding behavior, diet, and the substrate selectivity of H. radiatus in the remote Saint Peter and Saint Paul Archipelago (SPSPA), where this is the only species of this trophic group, and adds understanding about the role of this species in this singular system. Individuals of H. radiatus were captured and had their diet analyzed in the laboratory to identify and quantify their food items. Direct observations using scuba diving were also performed to describe the daily foraging frequency. Photoquadrats were taken to estimate the substrate relative cover, as a proxy of resource availability. The diet of H. radiatus in SPSPA was mainly composed of damselfish eggs and crustaceans in addition to gastropods, mollusks, and sponges, which reinforces its generalist feeding habits. Individuals of H. radiatus foraged mainly on substrates composed by epilithic algal matrix, which was the most abundant substrate in the study area, but preferred bare rocks and sediment. The foraging activity was constant throughout the daytime, decreasing at sunset. Our results suggest that H. radiatus has a generalist habit, supporting the idea that it is a versatile species, foraging all day long, and constituting an important link in the trophic chain of the archipelago.
      PubDate: 2022-05-04
       
  • The first report on food and feeding habits of yellowtail mullet,
           Minimugil cascasia (Hamilton, 1822), of the tropical River Ganga, India

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      Abstract: Abstract This is the first study conducted on the food and feeding habits of the yellowtail mullet (Minimugil cascasia), in the Ganga River (India). The gut contents of 276 individuals (TL: 45.32–89.79 mm) were investigated. Dominant food items of the yellowtail mullet included three diatoms, namely Cyclotella sp., Amphora sp., and Aulacosiera sp.; one green alga, Scenedesmus sp.; two blue-green algae, Merismopedia sp. and Nostoc sp. The food composition varied according to the size class of fish, with small individuals feeding on the blue-green algae and large one feeding on the diatoms and green algae. Sand and detritus comprising 84.16% and 81.87% by frequency and 48.83% and 20.31% by volume, respectively, dominated in the gut contents of the yellowtail mullet. The relative gut length (RGL) of the yellowtail mullet suggested an omnivorous iliophagous feeding habit, where foods items are picked up from the bottom mud layer known as the iliotrophic layer.
      PubDate: 2022-04-30
       
  • Electronic tagging of Bluefin Tunas from the Maltese spawning ground
           suggests size-dependent migration dynamics

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      Abstract: Abstract The purse seine fishery in the Mediterranean represents about 60% of the international catch for Atlantic Bluefin Tuna (Thunnus thynnus). Yet, tagging operations from this segment of the fisheries remain rare and despite its potential importance for management, several aspects related to the migratory behavior of Atlantic Bluefin Tuna from these areas remain unaddressed. In the present manuscript, we report the results of two tagging operations carried out on a commercial purse seiner during two consecutive years in the spawning ground around the Maltese islands in the Central Mediterranean Sea. During these operations, eight individuals were tagged and the results showed that the larger fish (> 200 cm) undertook large-scale migrations outside the Mediterranean, whereas smaller individuals did not. This study suggests that size might affect the migratory behavior of Atlantic Bluefin Tuna, and underlines the potential of large-scale tagging operations from spawning grounds to address scientific questions having significant management implications.
      PubDate: 2022-04-30
       
  • Temperature and oxygen supply shape the demersal community in a tropical
           Oxygen Minimum Zone

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      Abstract: Abstract The organisms that inhabit Oxygen Minimum Zones (OMZ) have specialized adaptations that allow them to survive within a very narrow range of environmental conditions. Consequently, even small environmental perturbations can result in local species distribution shifts that alter ecosystem trophodynamics. Here, we examined the effect of changing sea water temperatures and oxygen levels on the physiological performance and metabolic traits of the species forming marine demersal communities along the OMZ margins in the Costa Rican Pacific. The strong temperature and oxygen gradients along this OMZ margin provide a “natural experiment” to explore the effects of warming and hypoxia on marine demersal communities. We identified two distinct marine fauna communities separated by an environmental oxygen partial pressure threshold of 0.003–0.009 atm. The community inhabiting cooler waters with less oxygen was comprised of species with very low oxygen demands, while the second community inhabiting warmer waters with more oxygen was comprised by a higher diversity of species with higher oxygen demands. We also compared the community composition across different El Niño Southern Oscillation phases. During “neutral” and El Niño conditions, with relatively warmer temperatures and higher oxygen levels, species’ average oxygen demand was higher, and species stayed at greater depths than during the cooler, low oxygen, La Niña phases. Our findings suggest that the effects of environmental temperature and oxygen levels on the structure of demersal communities within OMZs can be predicted by understanding species’ oxygen demand. This study highlights the vulnerability of demersal ecosystem structures surrounding the Costa Rican OMZ to deoxygenation and warming under climate change.
      PubDate: 2022-04-25
       
  • Movement ecology of the white seabream Diplodus sargus across its life
           cycle: a review

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      Abstract: Abstract The white seabream Diplodus sargus (L., 1758) (Osteichthyes, Sparidae) is a littoral species living mainly in rocky habitats and distributed in the eastern Atlantic and the Mediterranean. This species is targeted by artisanal and recreational fisheries and presents a high commercial importance. Although classified by IUCN as a “least concern” species, it has been the object of marine ranching and restocking initiatives to counteract locally intense exploitation. Here, we review the current knowledge on the movement ecology of white seabream given the relevance of animal movement in ecological and behavioral studies and their potential application in management and conservation. The literature on this topic was analyzed in order to summarize the results of past research and to identify the gaps that still exist on the matter. We reviewed a total of 27 papers focusing on the movement ecology of white seabream, where acoustic telemetry (n = 12), underwater visual observation and traditional tagging (n = 6), genetic analysis (n = 6), and otolith microchemistry (n = 3) were used. While the first three methods were applied to juvenile and adult fish, the last one was also used with larvae, which have been the object of experimental trials to ascertain their swimming abilities. The largest amount of information on activity rhythms (diurnal with a few exceptions), movement patterns (short distances), homing (ability to come back to the capture site), site fidelity (high), and home range (< 200 ha on average and highly related with seabed morphology) were obtained through acoustic telemetry, whose main limitation is the minimum body size required for its application. The environmental variables found to affect movement patterns in this species are water temperature (which triggers spawning-based vertical movements), local sea conditions (which affect short-scale movements in juveniles), and the main seabed features (orientation and habitat type). The main gaps identified, which need more extensive research and some technological improvements, include the study of the effects of environmental variables on fish movements and further investigations on the movement patterns of juveniles.
      PubDate: 2022-04-25
       
  • On the relevance of animal behavior to the management and conservation of
           fishes and fisheries

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      Abstract: Abstract There are many syntheses on the role of animal behavior in understanding and mitigating conservation threats for wildlife. That body of work has inspired the development of a new discipline called conservation behavior. Yet, the majority of those synthetic papers focus on non-fish taxa such as birds and mammals. Many fish populations are subject to intensive exploitation and management and for decades researchers have used concepts and knowledge from animal behavior to support management and conservation actions. Dr. David L. G. Noakes is an influential ethologist who did much foundational work related to illustrating how behavior was relevant to the management and conservation of wild fish. We pay tribute to the late Dr. Noakes by summarizing the relevance of animal behavior to fisheries management and conservation. To do so, we first consider what behavior has revealed about how fish respond to key threats such as habitat alteration and loss, invasive species, climate change, pollution, and exploitation. We then consider how behavior has informed the application of common management interventions such as protected areas and spatial planning, stock enhancement, and restoration of habitat and connectivity. Our synthesis focuses on the totality of the field but includes reflections on the specific contributions of Dr. Noakes. Themes emerging from his approach include the value of fundamental research, management-scale experiments, and bridging behavior, physiology, and ecology. Animal behavior plays a key role in understanding and mitigating threats to wild fish populations and will become more important with the increasing pressures facing aquatic ecosystems. Fortunately, the toolbox for studying behavior is expanding, with technological and analytical advances revolutionizing our understanding of wild fish and generating new knowledge for fisheries managers and conservation practitioners.
      PubDate: 2022-04-23
       
  • Chinook salmon prey upon large midwater fish in offshore Pacific Ocean

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      Abstract: Abstract A midwater fish species, duckbill barracudina Magnisudis atlantica, was recorded as a prey item for Chinook salmon Oncorhynchus tshawytscha at high seas for the first time. The prey-to-predator size ratio of this occurrence is evidence that salmon can feed upon bigger prey than considered before.
      PubDate: 2022-04-22
       
  • Signature of climate-induced changes in seafood species served in
           restaurants

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      Abstract: Abstract Climate change is causing shifts in biogeography of marine species, towards higher latitude, deeper waters, or following local temperature gradients. Such species distribution changes are affecting global fisheries through increasing the dominance of warmer-water preferred species as ocean temperature increases. Previous modeling analyses projected that climate-induced changes in seafood availability would affect the entire seafood chain. However, observed climate impacts on seafood retailers and consumers have rarely been demonstrated. Seafood restaurants usually rely on the supply of locally caught species, and thus the impacts of changing catches on the food they serve, and consequently on their diners, may be reflected in their menus. In this study, 362 restaurant menus from Vancouver, British Columbia, Canada, were collated and analyzed over four different time periods (1880–1960, 1961–1980, 1981–1996, and 2019–2021). Moreover, 148 present-day menus from two other cities north (Anchorage, AK, USA) and south (Los Angeles, CA, USA) of Vancouver were also collected. An index, herein called Mean Temperature of Restaurant Seafood (MTRS), was calculated from the average temperature preference of the species of seafood identified in the menus for each time period or location. Overall, the MTRS of menus from Vancouver increased from 10.7 ± 0.7 °C to 13.8 ± 1.0 °C (95% confidence intervals) between 1888–1960 and 2019–2021. Present-day MTRS was among the highest in Los Angeles (16.5 ± 1.7 °C) and lowest in Anchorage (9.6 ± 1.0 °C). The temporal and spatial variations in MTRS are significantly related to observed patterns of average sea surface temperature and the Mean Temperature of the Catch. This suggests that restaurant menus may be used as a complementary information source regarding changes in marine ecosystems and fisheries and the seafood sector’s responses to these changes. This study also highlights the value of using unconventional information sources and their applications in the detection of climate impacts on oceans and their dependent human communities.
      PubDate: 2022-04-15
       
  • Movement patterns of juvenile green sturgeon (Acipenser medirostris) in
           the San Francisco Bay Estuary

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      Abstract: Abstract Little is known about the distribution and ecology of juvenile green sturgeon throughout their range and specifically within California’s Central Valley and the San Francisco Bay Estuary. The objective of our study was to identify rearing movement patterns of juvenile green sturgeon and their interaction with Delta and Bay habitats. Acoustic biotelemetry was used to record juvenile movements and residence within different regions of this highly modified watershed. We document a diversity of movements exhibited by 31 acoustically tagged juvenile green sturgeon monitored over a 9-month period. The juvenile sturgeon either (1) remained in the Delta or moved (2) into the Carquinez Straits, (3) into San Pablo Bay, (4) into San Pablo Bay but returned to Delta, (5) through the estuary and likely left through the mouth of the bay, (6) or left the estuary only to return later. Spatiotemporal habitat quality varies within and between Delta and Bay habitats. Variation in water year and hydrologic connectivity are likely to influence habitat quality and quantity, and behaviors may be differentially optimized for fitness in response to environmental variation. Our results provide initial evidence supporting multiple behavioral movement patterns and a broad use of regional habitats for green sturgeon in the California Central Valley. This apparent behavioral diversity observed through movement patterns may ensure long-term success of all population segments over time in an extremely variable environment, ultimately supporting overall population stability (i.e., the portfolio effect). Enhanced conservation efforts may be needed to protect juvenile green sturgeon and the habitats they rely upon.
      PubDate: 2022-04-13
       
  • Waif or hybrid' Observation records of rare coloration grouper in
           Djibouti

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      Abstract: Abstract We observed groupers with an unusual color pattern in Ghoubet-Al-Kharab Bay, Djibouti, on two occasions in 2014 and 2020. It matches the field observation of a juvenile Cephalopholis formosa in India in 1980. If this is the case, our observation represents a major range extension for C. formosa. Alternatively, based on the intermediate coloration of the specimens and sightings, we propose that they may be hybrids of C. formosa and C. oligosticta. We present two possible scenarios that may have facilitated hybridization: rarity and overlapping ranges in Djibouti with self-recruitment or rarity and overlapping ranges in another location (e.g., Socotra or the Arabian Sea) with long-distance larval dispersal to Djibouti. This hybridization is possible given the genetic similarity between the two putative parent species and because similar hybridization cases have been recorded within this genus and family elsewhere. However, both of these scenarios would require a range extension for one or both parent species as they are not previously known to overlap. Nevertheless, further field observations and genetic studies are required to verify the proposed identification of the putative hybrid and test the presented scenarios.
      PubDate: 2022-04-12
       
  • Feeding niche overlap between native and alien fishes in Swat River,
           Khyber Pakhtunkhwa, Pakistan

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      Abstract: Abstract One of the major causes of biodiversity loss in freshwater ecosystems is the introduction of alien species. The common carp has been established in every freshwater ecosystem of Pakistan and is a leading threat to the native ichthyofauna. In the present study, stable isotopes of nitrogen and carbon (δ15N and δ13C) are used to explore the feeding niche overlap among alien Cyprinus carpio (common carp) and native omnivorous fishes including Tor putitora (mahseer) and Barilius pakistanicus (Pakistani chalwa) from Swat River, Khyber Pakhtunkhwa (KP), Pakistan. Differences in mean values of δ15N and δ13C among the species were found non-significant. Community-wide metrics within δ13C-δ15N bi-plot space reflecting vital aspects of the trophic structure were also calculated. It was found that all the selected species were feeding at the same trophic level, whereas niche size and trophic diversity of common carp was greater compared to both of the native species which indicated that this alien fish is a highly opportunistic feeder on different food items with multiple basal resources having a wide range of δ13C values. Mahseer occupied a very small trophic niche within the niche space of common carp. This shows that mahseer is relatively a specialist feeder on fewer food sources; hence, mahseer might be subjected to the higher threat posed by the alien species. The trophic niche area of Pakistani chalwa was also smaller than common carp but wider than mahseer indicating a relatively lower degree of overlap with common carp.
      PubDate: 2022-04-12
       
  • Potential and limitations of applying the mean temperature approach to
           fossil otolith assemblages

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      Abstract: Abstract Evaluation of the impact of climatic changes on the composition of fish assemblages requires quantitative measures that can be compared across space and time. In this respect, the mean temperature of the catch (MTC) approach has been proven to be a very useful tool for monitoring the effect of climate change on fisheries catch. Lack of baseline data and deep-time analogues, however, prevent a more comprehensive evaluation. In this study, we explore the applicability of the mean temperature approach to fossil fish faunas by using otolith assemblage data from the eastern Mediterranean and the northern Adriatic coastal environments corresponding to the last 8000 years (Holocene) and the interval 2.58–1.80 Ma B. P. (Early Pleistocene). The calculated mean temperatures of the otolith assemblage (MTO) range from 13.5 to 17.3 °C. This case study shows that the MTO can successfully capture compositional shifts in marine fish faunas based on variations in their climatic affinity driven by regional climate differences. However, the index is sensitive to methodological choices and thus requires standardized sampling. Even though theoretical and methodological issues prevent direct comparisons between MTO and MTC values, the MTO offers a useful quantitative proxy for reconstructing spatial and temporal trends in the biogeographic affinity of fossil otolith assemblages.
      PubDate: 2022-04-12
       
  • A new element in the migration cycle of the European river lamprey
           Lampetra fluviatilis: downstream migration from a lake

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      Abstract: Abstract In 2019, during spring flood, we collected unusual Lampetra fluviatilis smolts migrating from a small lake, as part of a multi-year survey in the Chernaya River (Gulf of Finland, Baltic Sea). They differed from the ordinary Lampetra fluviatilis individuals in some of the features, mainly size. The emigration occurred at the darkest period of night and during extreme flooding, which significantly worsened the conditions in the Lake Gladyshevskoe and Chernaya River. In these individuals, lacus smolts, emigration occurred in the spring season with the migration of ordinary flumen specimens. Several hypotheses are discussed to explain the observation of large lacus (148–165 mm) individuals: they are seaward migrants, within expected body sizes of European river lamprey species but unusual for Gulf of Finland tributaries; the lake is a transitional habitat, and the postmetamorphic lacus juveniles migrating through it from a tributary; postmetamorphic lacus juveniles spend some time feeding in a lake but emigrated due to environmental conditions; larvae of European river lamprey, developing in the eutrophic lake, reach greater sizes than riverine larvae before transformation and subsequently produce larger juveniles.
      PubDate: 2022-04-09
       
  • Warmer temperature decreases the maximum length of six species of marine
           fishes, crustacean, and squid in New Zealand

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      Abstract: Abstract As global oceans continue to warm and deoxygenate, it is expected that marine ectotherms will reduce in body size resulting from the interactive effects of temperature and dissolved oxygen availability. A temperature-size response describes how wild populations of ectothermic species grow faster and reach a smaller size within warmer temperatures. While temperature-size responses are well observed in marine ectotherms, the mechanisms underpinning such a reduction in body size remain debated. Here, we analyse the relative influence of temperature, dissolved oxygen concentration, and geographic location (which encompasses multiple latent variables), on the maximum body length of four fish, one crustacean, and one squid species, which inhabit shallow to deep sea (1000 m) New Zealand waters across a temperature gradient of 1.5 to 18 °C. We found that all study species displayed a temperature-size response, with the strongest response exhibited by the largest species, hoki (Macruronus novaezelandiae). We also found that temperature was more important than dissolved oxygen concentration in determining maximum body length, as dissolved oxygen levels were at or near saturation in the study area. Our results suggest that larger-bodied species may experience the strongest temperature-size responses, and support expectations from the gill-oxygen limitation theory (GOLT) and the oxygen and capacity limited thermal tolerance (OCLTT) concept that increases in oxygen demand may be size- and temperature-dependent, thus driving a reduction in maximum body length of marine ectotherms with warming.
      PubDate: 2022-04-09
       
  • Phylogeographic structure and population demography of the leopard
           mandarin fish (Siniperca scherzeri) in the Pearl River drainage

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      Abstract: Abstract Drainage development and climatic fluctuations shape the phylogeographic patterns of freshwater fish species. In this study, we used the mitochondrial control region to determine the population structure and demographical history of the leopard mandarin fish (Siniperca scherzeri) in the Pearl River drainage and to test whether the historical development of the river and climatic changes that occurred in southern China have influenced the phylogeographic patterns of this species. Phylogenetic analyses, the use of haplotype networks, and population structure analyses revealed two geographically distinct genetic lineages, A and B. Lineage A was widespread in the Xijiang and Beijiang Rivers, whereas lineage B was only detected in the Dongjiang River. Dating analyses and biogeographic analyses indicated that the two lineages originated from a vicariance event 1.11 million years ago (Ma), which coincides with the historical development of the drainage during the early Quaternary period. Demographic analyses showed that the populations of lineage B experienced sharp demographic contraction of 0.01 Ma, which suggests that sea-level transgression after the Last Glacial Maximum may have played a critical role in the population demography of lineage B. By contrast, the populations of lineage A were less influenced by the sea-level transgression owing to larger distribution ranges. Overall, our study uncovered the phylogeographic patterns of Siniperca scherzeri in the Pearl River drainage and provides valuable information for the management and conservation of this species.
      PubDate: 2022-03-30
       
 
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