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Dynamics of fish populations and communities within the Tonle Sap flood pulse system.

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Title: Dynamics of fish populations and communities within the Tonle Sap flood pulse system.
Authors: Chevalier, Mathieu1 (AUTHOR) mathieu.chevalier38@gmail.com, Kong, Heng2,3,4 (AUTHOR), Chan, Bunyeth5 (AUTHOR), Laffaille, Pascal3 (AUTHOR), Ngor, Peng Bun6 (AUTHOR), Lek, Sovan2 (AUTHOR), Hogan, Zeb S.7 (AUTHOR)
Source: Ecosphere. Apr2026, Vol. 17 Issue 4, p1-15. 15p.
Subject Terms: *Population dynamics, *Fish populations, *Fish communities, *Floodplain ecology, *Fishery management, *Lakes, Migratory fishes, Seasonal physiological variations
Geographic Terms: Southeast Asia
Abstract: The Tonle Sap Lake (TSL) is the most fish‐diverse lake in Southeast Asia and ranks among the world's richest inland fisheries. Although previous studies have described broad changes in fish abundance and community composition across the lake's annual flood pulse, the spatiotemporal dynamics of individual species and their co‐occurrence patterns remain poorly understood. Fish have traditionally been grouped into three migratory guilds: (1) resident species, (2) lateral migrants (short‐distance movers between lake and floodplain), and (3) longitudinal migrants (long‐distance movers in and out of the lake). If this classification holds, species within the same guild should exhibit similar population dynamics. To test this, we analyzed weekly fish catch data from 2012 to 2015 across five sites, focusing on 71 common species. Using population synchrony analysis and probabilistic models, we found pronounced seasonal variations in both species abundance and occurrence, especially among long‐distance migrators, which increased during high‐ and receding‐water periods. Resident and short‐distance migrators also showed seasonal changes, leading to seasonal shifts in community composition. However, these temporal patterns varied across locations, likely due to differences in environmental conditions and habitat availability. This spatial variation led to low synchrony in population dynamics across sites, though some species showed heightened synchrony during particular hydrological periods. Within sites, species belonging to the same migratory guild, especially resident species, tended to be more synchronized during high‐ and rising‐water periods, suggesting shared responses to local abiotic drivers. Co‐occurrence analyses further revealed periodic shifts in species associations, with more positive associations during high‐ and receding‐water stages. Collectively, these results demonstrate strong seasonal restructuring of fish populations and communities in TSL, but inconsistent spatial patterns. Our findings indicate that guild‐based classifications only partially capture the dynamics of TSL fish assemblages and that effective fishery management should incorporate additional ecological and habitat‐specific factors. [ABSTRACT FROM AUTHOR]
Copyright of Ecosphere is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Dynamics of fish populations and communities within the Tonle Sap flood pulse system.
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  Data: <searchLink fieldCode="AR" term="%22Chevalier%2C+Mathieu%22">Chevalier, Mathieu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> mathieu.chevalier38@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Kong%2C+Heng%22">Kong, Heng</searchLink><relatesTo>2,3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chan%2C+Bunyeth%22">Chan, Bunyeth</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Laffaille%2C+Pascal%22">Laffaille, Pascal</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ngor%2C+Peng+Bun%22">Ngor, Peng Bun</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lek%2C+Sovan%22">Lek, Sovan</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hogan%2C+Zeb+S%2E%22">Hogan, Zeb S.</searchLink><relatesTo>7</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Ecosphere%22">Ecosphere</searchLink>. Apr2026, Vol. 17 Issue 4, p1-15. 15p.
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  Data: *<searchLink fieldCode="DE" term="%22Population+dynamics%22">Population dynamics</searchLink><br />*<searchLink fieldCode="DE" term="%22Fish+populations%22">Fish populations</searchLink><br />*<searchLink fieldCode="DE" term="%22Fish+communities%22">Fish communities</searchLink><br />*<searchLink fieldCode="DE" term="%22Floodplain+ecology%22">Floodplain ecology</searchLink><br />*<searchLink fieldCode="DE" term="%22Fishery+management%22">Fishery management</searchLink><br />*<searchLink fieldCode="DE" term="%22Lakes%22">Lakes</searchLink><br /><searchLink fieldCode="DE" term="%22Migratory+fishes%22">Migratory fishes</searchLink><br /><searchLink fieldCode="DE" term="%22Seasonal+physiological+variations%22">Seasonal physiological variations</searchLink>
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  Label: Geographic Terms
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  Data: <searchLink fieldCode="DE" term="%22Southeast+Asia%22">Southeast Asia</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The Tonle Sap Lake (TSL) is the most fish‐diverse lake in Southeast Asia and ranks among the world's richest inland fisheries. Although previous studies have described broad changes in fish abundance and community composition across the lake's annual flood pulse, the spatiotemporal dynamics of individual species and their co‐occurrence patterns remain poorly understood. Fish have traditionally been grouped into three migratory guilds: (1) resident species, (2) lateral migrants (short‐distance movers between lake and floodplain), and (3) longitudinal migrants (long‐distance movers in and out of the lake). If this classification holds, species within the same guild should exhibit similar population dynamics. To test this, we analyzed weekly fish catch data from 2012 to 2015 across five sites, focusing on 71 common species. Using population synchrony analysis and probabilistic models, we found pronounced seasonal variations in both species abundance and occurrence, especially among long‐distance migrators, which increased during high‐ and receding‐water periods. Resident and short‐distance migrators also showed seasonal changes, leading to seasonal shifts in community composition. However, these temporal patterns varied across locations, likely due to differences in environmental conditions and habitat availability. This spatial variation led to low synchrony in population dynamics across sites, though some species showed heightened synchrony during particular hydrological periods. Within sites, species belonging to the same migratory guild, especially resident species, tended to be more synchronized during high‐ and rising‐water periods, suggesting shared responses to local abiotic drivers. Co‐occurrence analyses further revealed periodic shifts in species associations, with more positive associations during high‐ and receding‐water stages. Collectively, these results demonstrate strong seasonal restructuring of fish populations and communities in TSL, but inconsistent spatial patterns. Our findings indicate that guild‐based classifications only partially capture the dynamics of TSL fish assemblages and that effective fishery management should incorporate additional ecological and habitat‐specific factors. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Ecosphere is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1002/ecs2.70590
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 15
        StartPage: 1
    Subjects:
      – SubjectFull: Population dynamics
        Type: general
      – SubjectFull: Fish populations
        Type: general
      – SubjectFull: Fish communities
        Type: general
      – SubjectFull: Floodplain ecology
        Type: general
      – SubjectFull: Fishery management
        Type: general
      – SubjectFull: Lakes
        Type: general
      – SubjectFull: Migratory fishes
        Type: general
      – SubjectFull: Seasonal physiological variations
        Type: general
      – SubjectFull: Southeast Asia
        Type: general
    Titles:
      – TitleFull: Dynamics of fish populations and communities within the Tonle Sap flood pulse system.
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            NameFull: Kong, Heng
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              M: 04
              Text: Apr2026
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              Y: 2026
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