Spatial and temporal variation in fish community structure and diversity in the largest tropical flood‐pulse system of South‐East Asia

Peng Ngor; Gaël Grenouillet; Sea Phem; Nam So; Sovan Lek

doi:10.1111/eff.12417

journal article Jun 28, 2018

Spatial and temporal variation in fish community structure and diversity in the largest tropical flood‐pulse system of South‐East Asia

Peng Ngor

Gaël Grenouillet

Sea Phem Nam So Sovan Lek

Ecology of Freshwater Fish Vol. 27 No. 4 pp. 1087-1100 · Wiley

View at Publisher Save 10.1111/eff.12417

Abstract

AbstractThe Tonle Sap River and Lake (TSRL) is South‐East Asia's largest tropical flood pulse with a flow‐reversal system that supports one of the world's largest freshwater fisheries. However, among the world's tropical floodplains, the resources of the TSRL have received little ecological research. Here, we described the spatiotemporal TSRL fish diversity and community variation using daily records from 2012 to 2015 on fish abundance from six sites covering the TSRL system. We found that high fish diversity occurred in sites located in the middle of Tonle Sap Lake, and the lowest diversity was observed in the southern section. The spatial abundance distribution patterns displayed a river–lake gradient, with three fish assemblages that were clustered based on their composition similarities and were characterised by 96 indicator species. In the southern section, fish assemblages were characterised by longitudinal migratory fishes; in contrast, in the middle system, fish assemblages were represented by species with combined ecological attributes (i.e. longitudinal and lateral migratory species and floodplain residents). Towards the northern section, fish assemblages were composed of lateral migratory and floodplain resident species. Species richness and abundance peaked at approximately 2–2.5 and 4 months, respectively, after the peak flow in early October, during which Tonle Sap River resumes its normal flow direction (outflow). This suggests that seasonal flood pulses (i.e. rising and falling water levels) play a pivotal role in structuring spatiotemporal variation in the TSRL fish assemblages. Our study has implications for fisheries monitoring and conservation initiatives.

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Details

Published: Jun 28, 2018
Vol/Issue: 27(4)
Pages: 1087-1100
License: View

Authors

P

Peng Ngor

Fisheries Administration Phnom Penh Cambodia; CNRS Université Toulouse III Paul Sabatier ENFA UMR5174 EDB (Laboratoire Évolution & Diversité Biologique) Toulouse France

G

Gaël Grenouillet

CNRS Université Toulouse III Paul Sabatier ENFA UMR5174 EDB (Laboratoire Évolution & Diversité Biologique) Toulouse France; Institut Universitaire de France Paris France

S

Sea Phem

Tonle Sap Authority Phnom Penh Cambodia

N

Nam So

Fisheries Administration Phnom Penh Cambodia; Mekong River Commission Vientiane Laos

S

Sovan Lek

CNRS Université Toulouse III Paul Sabatier ENFA UMR5174 EDB (Laboratoire Évolution & Diversité Biologique) Toulouse France

Funding

Erasmus Plus

European Erasmus+ credit mobility and capacity building CONSEA Programme

Belmont Forum (TLSCC project)

Cite This Article

Peng Ngor, Gaël Grenouillet, Sea Phem, et al. (2018). Spatial and temporal variation in fish community structure and diversity in the largest tropical flood‐pulse system of South‐East Asia. Ecology of Freshwater Fish, 27(4), 1087-1100. https://doi.org/10.1111/eff.12417

Spatial and temporal variation in fish community structure and diversity in the largest tropical flood‐pulse system of South‐East Asia

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