2015
DOI: 10.1590/1982-0224-20140079
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Stable isotope evidence for trophic overlap of sympatric Mexican Lake Chapala silversides (Teleostei: Atherinopsidae: Chirostoma spp.)

Abstract: We explore the trophic role that a diverse sympatric group of fishes in the genus Chirostoma play in a large, shallow lake in central Mexico, Lake Chapala. We use δ13C and δ15N stable isotope - based food web analyses to explore how they relate to other components of the Lake Chapala ecosystem. We find five Chirostoma species in top trophic levels of the Chapala food web compared to other fishes, relying on a combination of zooplankton, fish and benthic resources as energy sources. Food web metric analyses sho… Show more

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Cited by 8 publications
(9 citation statements)
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“…The δ 13 C values of E. crassipes and S. yagara ranged from −31.6‰ to −23.3‰ and from −19.6‰ to −13.9‰, respectively. The δ 13 C values of E. crassipes were similar to those reported in other studies [37][38][40][41][42]. The δ 13 C values of S. yagara were lower than those reported in previous studies [37][38][40][41][42], similar to those reported for higher aquatic plants [43,49].…”
Section: Author Copy • Author Copy • Author Copy • Author Copy • Auth...supporting
confidence: 87%
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“…The δ 13 C values of E. crassipes and S. yagara ranged from −31.6‰ to −23.3‰ and from −19.6‰ to −13.9‰, respectively. The δ 13 C values of E. crassipes were similar to those reported in other studies [37][38][40][41][42]. The δ 13 C values of S. yagara were lower than those reported in previous studies [37][38][40][41][42], similar to those reported for higher aquatic plants [43,49].…”
Section: Author Copy • Author Copy • Author Copy • Author Copy • Auth...supporting
confidence: 87%
“…The δ 13 C values of E. crassipes were similar to those reported in other studies [37][38][40][41][42]. The δ 13 C values of S. yagara were lower than those reported in previous studies [37][38][40][41][42], similar to those reported for higher aquatic plants [43,49]. Eutrophication strongly affects the δ 13 C value of higher aquatic plants.…”
Section: Author Copy • Author Copy • Author Copy • Author Copy • Auth...supporting
confidence: 87%
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“…In the case of species of the humboldtianum group occurring within the Lake Chapala ( C. sphyraena , C. promelas , C. consocium , and C. lucius ), several hypotheses of ecological speciation suggest the coexistence of ecotypes in agreement with a differentiation of morphological traits (e.g., jaw shape, head length, oral gape, and gill raker structure) related to feeding habits [ 10 , 50 ], or an ecological partition that correlates with species body sizes (larger ‘peces blancos’ vs . smaller ‘charales’) [ 10 , 16 , 21 ]. However, no strong evidence showing clear patterns of differentiation between morphospecies or ecotypes has been documented to date [ 21 ].…”
Section: Discussionmentioning
confidence: 99%
“…smaller ‘charales’) [ 10 , 16 , 21 ]. However, no strong evidence showing clear patterns of differentiation between morphospecies or ecotypes has been documented to date [ 21 ].…”
Section: Discussionmentioning
confidence: 99%