Native fish assemblages in natural lakes across Japan: Endemism deterioration lasting centuries

Diversity and Distributions, Journal Year: 2024, Volume and Issue: 30(6)

Published: April 11, 2024

Abstract Aim This study aimed to illustrate the changing diversity patterns of native freshwater fish in past two centuries and identify priority locations for conservation counter future degradation. Location Japanese archipelago. Methods We used published fauna data 39 lakes across Japan, analysing historical current projecting distribution based on Red List. assessed assemblages' taxonomic, phylogenetic, functional alpha beta different periods. Additionally, we proposed a cumulative index that incorporated phylogenetic facets, then examined its relationship with latitudinal positioning Results observed significant decrease richness since Accompanying this decline were reductions both relatedness redundancy. Fish increased from present is predicted drastically, indicating an ongoing homogenization process. Using index, identified Hokkaido Kyushu as crucial habitats endemic fishes. These islands, unique biogeographical backgrounds, contributed substantially national dissimilarity assemblages period. However, contribution diminishing due endemism. Main Conclusions The Japan should be assigned inhabited species. framework assessing biotic communities presented potential aid macroecological explorations underpin biodiversity conservation.

Language: Английский

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Effects of the Three Gorges Dam on the mandarin fish larvae (Siniperca chuatsi) in the middle reach of the Yangtze River: Spatial gradients in abundance, feeding, growth, and survival

Ecology Of Freshwater Fish, Journal Year: 2024, Volume and Issue: unknown

Published: June 5, 2024

Abstract Large dams significantly impact river ecosystems by disrupting connectivity, altering physicochemical variables, and modifying flow regimes. These modifications influence the spatial temporal dynamics of biological processes species distributions. While much research has focused on potamodromous species, there remains a gap in understanding recovery gradients resident dam‐altered rivers. This study examines responses larvae mandarin fish ( Siniperca chuatsi ), to environmental alterations caused Three Gorges Dam (TGD) middle reach Yangtze River. We hypothesized that larval abundance, feeding, growth, survival would exhibit longitudinal gradients, improving with increased distance from TGD. Our results confirm this hypothesis, showing further TGD exhibited higher feeding intensity, enhanced growth rates, improved rate, earlier peak abundance hatching dates. Key factors, including water temperature discharge, downstream, while transparency decreased. Major tributary inputs contributed these gradients. The observed attributes mirrored changes, underscoring population recruitment. highlight broader implications dam‐induced changes recruitment, potentially affecting entire communities. contributes distinct patterns trends, providing valuable insights for designing more effective conservation management practices freshwater fishes large regulated

Language: Английский

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Simulation of Vertical Water Temperature Distribution in a Megareservoir: Study of the Xiaowan Reservoir Using a Hybrid Artificial Neural Network Modeling Approach

Journal of Hydrologic Engineering, Journal Year: 2024, Volume and Issue: 29(6)

Published: Oct. 10, 2024

Language: Английский

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Spawning cohort trade‐offs of reproductive time and output in cyprinid fish along an elevation gradient

Ecology Of Freshwater Fish, Journal Year: 2023, Volume and Issue: 33(2)

Published: Dec. 7, 2023

Abstract Understanding environmental requirements for fish reproduction in natural habitats is crucial population conservation and restoration. However, such information extremely scarce the highly threatened schizothoracine fishes that cover large elevation ranges on Tibetan Plateau. This research investigated spawning time, output conditions of wild Schizopygopsis thermalis along an elevational gradient (i.e., from 1766 to 4372 m) upper Nu‐Salween River. It found grounds S. were mainly located at elevations between 3600 m, mostly consist still marginal areas (still water <10 cm deep) with gravel substrates. Otolith microstructure analysis revealed, first spawns two seasons winter: December next February, spring: April May), winter period generally longer than spring period. Winter started earlier ended higher elevations, while occurred lower but simultaneously elevations. As increases, reproductive also cohorts shift winter‐dominant spring‐dominant. associated temperatures discharges cohort, both showed elevation‐related preferences. Our results suggest can adapt strategies conditions, which fill gaps characteristics fishes, highlight importance conserving high Qinghai‐Tibetan rivers.

Language: Английский

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