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Seasonal variations in diet composition, diet breadth and dietary overlap between three commercially important fish species within a flood-pulse system: The Tonle Sap Lake (Cambodia).
PLoS One 2018; 13(6):e0198848Plos

Abstract

Tropical lakes and their associated floodplain habitats are dynamic habitat mosaics strongly influenced by seasonal variations in hydrologic conditions. In flood-pulse systems, water level oscillations directly influence the connectivity to floodplain habitats for fish. Here, we aimed to investigate whether seasonal changes in the water level of a flood-pulse system (the Tonle Sap Lake, Cambodia) differentially affect diet breadth and dietary overlap of three common and commercially important fish species (Anabas testudineus, Boesemania microplepis and Notopterus notopterus) presenting important differences in their life-cycle (e.g. seasonal migration). For this purpose, the three fish species were sampled at four locations spread over the lake and their stomach contents extracted for analyses. Dietary differences were investigated across seasons regarding the diet composition and diet breadth of each species as well as the amount of dietary overlap between species. We found that the proportion of empty stomachs changed similarly across seasons for the three species, thus suggesting that ecological differences between species are not sufficient to outweigh the effect of seasonal variations in resource abundance. In contrast, changes in diet composition were species-specific and can be explained by ecological and behavioral differences between species. Diet breadth differed between species in all seasons, except during the wet season, and tended to be higher during the dry season when dietary overlap was the lowest. These variations likely result from changes in the diversity and amount of resources and may lead to habitat use shifts with potential implications for competitive interactions. In particular, increasing connectivity to floodplain habitats may reduce the competitive pressure during the wet season, while resource scarcity during the dry season may constrain individuals to diversify their diet to avoid competition. Overall, our results suggest a considerable plasticity in the feeding behavior of the three species as demonstrated by seasonal variation in both diet breadth and dietary overlap. Such variations can be explained by a number of factors and processes, including changes in resource availability or competitive interactions between individuals for resources, whose relative influence might vary depending on the magnitude and the timing of the flood-pulse driving the connectivity to floodplain habitats. Gaining knowledge on the seasonal evolution of fish's diet is relevant for fisheries management and conservation and our result could be used to guide aquaculture development in Cambodia.

Authors+Show Affiliations

EDB, Université de Toulouse, CNRS, ENFA, UPS, Toulouse, France. EcoLab, Université de Toulouse, CNRS, INPT, UPS, Toulouse, France.EDB, Université de Toulouse, CNRS, ENFA, UPS, Toulouse, France. Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.EDB, Université de Toulouse, CNRS, ENFA, UPS, Toulouse, France.EcoLab, Université de Toulouse, CNRS, INPT, UPS, Toulouse, France.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

29912953

Citation

Heng, Kong, et al. "Seasonal Variations in Diet Composition, Diet Breadth and Dietary Overlap Between Three Commercially Important Fish Species Within a Flood-pulse System: the Tonle Sap Lake (Cambodia)." PloS One, vol. 13, no. 6, 2018, pp. e0198848.
Heng K, Chevalier M, Lek S, et al. Seasonal variations in diet composition, diet breadth and dietary overlap between three commercially important fish species within a flood-pulse system: The Tonle Sap Lake (Cambodia). PLoS ONE. 2018;13(6):e0198848.
Heng, K., Chevalier, M., Lek, S., & Laffaille, P. (2018). Seasonal variations in diet composition, diet breadth and dietary overlap between three commercially important fish species within a flood-pulse system: The Tonle Sap Lake (Cambodia). PloS One, 13(6), pp. e0198848. doi:10.1371/journal.pone.0198848.
Heng K, et al. Seasonal Variations in Diet Composition, Diet Breadth and Dietary Overlap Between Three Commercially Important Fish Species Within a Flood-pulse System: the Tonle Sap Lake (Cambodia). PLoS ONE. 2018;13(6):e0198848. PubMed PMID: 29912953.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Seasonal variations in diet composition, diet breadth and dietary overlap between three commercially important fish species within a flood-pulse system: The Tonle Sap Lake (Cambodia). AU - Heng,Kong, AU - Chevalier,Mathieu, AU - Lek,Sovan, AU - Laffaille,Pascal, Y1 - 2018/06/18/ PY - 2017/11/29/received PY - 2018/05/25/accepted PY - 2018/6/19/entrez PY - 2018/6/19/pubmed PY - 2018/6/19/medline SP - e0198848 EP - e0198848 JF - PloS one JO - PLoS ONE VL - 13 IS - 6 N2 - Tropical lakes and their associated floodplain habitats are dynamic habitat mosaics strongly influenced by seasonal variations in hydrologic conditions. In flood-pulse systems, water level oscillations directly influence the connectivity to floodplain habitats for fish. Here, we aimed to investigate whether seasonal changes in the water level of a flood-pulse system (the Tonle Sap Lake, Cambodia) differentially affect diet breadth and dietary overlap of three common and commercially important fish species (Anabas testudineus, Boesemania microplepis and Notopterus notopterus) presenting important differences in their life-cycle (e.g. seasonal migration). For this purpose, the three fish species were sampled at four locations spread over the lake and their stomach contents extracted for analyses. Dietary differences were investigated across seasons regarding the diet composition and diet breadth of each species as well as the amount of dietary overlap between species. We found that the proportion of empty stomachs changed similarly across seasons for the three species, thus suggesting that ecological differences between species are not sufficient to outweigh the effect of seasonal variations in resource abundance. In contrast, changes in diet composition were species-specific and can be explained by ecological and behavioral differences between species. Diet breadth differed between species in all seasons, except during the wet season, and tended to be higher during the dry season when dietary overlap was the lowest. These variations likely result from changes in the diversity and amount of resources and may lead to habitat use shifts with potential implications for competitive interactions. In particular, increasing connectivity to floodplain habitats may reduce the competitive pressure during the wet season, while resource scarcity during the dry season may constrain individuals to diversify their diet to avoid competition. Overall, our results suggest a considerable plasticity in the feeding behavior of the three species as demonstrated by seasonal variation in both diet breadth and dietary overlap. Such variations can be explained by a number of factors and processes, including changes in resource availability or competitive interactions between individuals for resources, whose relative influence might vary depending on the magnitude and the timing of the flood-pulse driving the connectivity to floodplain habitats. Gaining knowledge on the seasonal evolution of fish's diet is relevant for fisheries management and conservation and our result could be used to guide aquaculture development in Cambodia. SN - 1932-6203 UR - https://www.unboundmedicine.com/medline/citation/29912953/Seasonal_variations_in_diet_composition_diet_breadth_and_dietary_overlap_between_three_commercially_important_fish_species_within_a_flood_pulse_system:_The_Tonle_Sap_Lake__Cambodia__ L2 - http://dx.plos.org/10.1371/journal.pone.0198848 DB - PRIME DP - Unbound Medicine ER -