2016
DOI: 10.1139/cjfas-2015-0214
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Seasonal hydrology shifts production sources supporting fishes in rivers of the Lower Mekong Basin

Abstract: Seasonal hydrology is assumed to be an important reason why the Lower Mekong Basin supports highly productive and biodiverse inland fisheries. We used C and N stable isotope ratios of tissue samples to estimate primary production sources supporting fish biomass in the Mekong and three large tributaries in Cambodia. We used a Bayesian mixing model to estimate relative contributions of four alternative production sources — seston, benthic algae, riparian grasses, and riparian macrophytes. There was little season… Show more

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Cited by 36 publications
(30 citation statements)
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References 87 publications
(67 reference statements)
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“…C 4 grasses are generally unimportant food sources for fish despite their often‐high productivity (Forsberg, Araujo‐Lima, Martinelli, Victoria, & Bonassi, ; Jepsen & Winemiller, ). C 3 plants and algae have been found to support trophic pathways to river fishes of the Mekong basin in Asia (Ou & Winemiller, ), the Paraná and Amazon basins in South America (Forsberg et al., ; Hoeinghaus, Winemiller, & Agostinho, ; Oliveira, Soares, Martinelli, & Moreira, ) and the Brazos River in North America (Zeug & Winemiller, ). Accordingly, inundatable floodplain area is generally positively related to fish biomass and associated fishery yields (Castello, Isaac et al., ; Welcomme, ).…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…C 4 grasses are generally unimportant food sources for fish despite their often‐high productivity (Forsberg, Araujo‐Lima, Martinelli, Victoria, & Bonassi, ; Jepsen & Winemiller, ). C 3 plants and algae have been found to support trophic pathways to river fishes of the Mekong basin in Asia (Ou & Winemiller, ), the Paraná and Amazon basins in South America (Forsberg et al., ; Hoeinghaus, Winemiller, & Agostinho, ; Oliveira, Soares, Martinelli, & Moreira, ) and the Brazos River in North America (Zeug & Winemiller, ). Accordingly, inundatable floodplain area is generally positively related to fish biomass and associated fishery yields (Castello, Isaac et al., ; Welcomme, ).…”
Section: Introductionmentioning
confidence: 99%
“…C 4 grasses are generally unimportant food sources for fish despite their often-high productivity (Forsberg, Araujo-Lima, Martinelli, Victoria, & Bonassi, 1993;Jepsen & Winemiller, 2007). C 3 plants and algae have been found to support trophic pathways to river fishes of the Mekong basin in Asia (Ou & Winemiller, 2016), the Paraná and Amazon basins in South America (Forsberg et al, 1993;Hoeinghaus, Winemiller, & Agostinho, 2007; and the Brazos River in North America (Zeug & Winemiller, 2008).…”
Section: Introductionmentioning
confidence: 99%
“…For a given element, the stable isotope composition of a consumer's tissue is determined by its diet composition and tissue turnover time, isotopic differences among sources, the element's TDF, and other factors (Dalerum and Angerbjorn 2005, Fink et al 2012, Woodland et al 2012, Yeakel et al 2016. Muscle tissue turnover time of Tonle Sap fishes should be sufficiently fast to reflect major dietary shifts between the wet and dry season (see Appendix S1 for details), an assumption supported by findings from a recent study that documented shifts in isotopic ratios of fishes in the Lower Mekong and tributary rivers in eastern Cambodia (Ou and Winemiller 2016). Effect sizes with pooled standard deviations and 95% confidence intervals (Coe 2002) were calculated to explore variation around mean values for trophic position shifts, and quadratic regression was used to explore how the seasonal shift in trophic position related to mean body size and functional group across the 26 species.…”
Section: Methodsmentioning
confidence: 90%
“…Dry season transparency is potentially a sensitive indicator of these development impacts. More importantly, this parameter is the predominant driver of autochthonous benthic primary production in the lower Mekong mainstream, which is essential for sustaining secondary production (Ou & Winemiller, ). Remarkably, despite its profound influence on aquatic ecosystem function in the dry season, there are almost no published records of Mekong River transparency.…”
Section: Discussionmentioning
confidence: 99%