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| McMahan,Caleb D.; Matamoros,Wilfredo A.; Elías,Diego J.; Piller,Kyle R.. |
| ABSTRACT Pacific and Atlantic-slope rivers of the Isthmus of Tehuantepec in Mexico contain two cichlid species of the genus Vieja relevant to the current study, V. zonata and V. coatlicue, respectively. The Atlantic-slope species was initially considered a population of uncertain taxonomic status and recently described as a distinct species based on three putatively diagnostic morphological characters. The objective of this study was to combine new and existing genetic data, along with reanalysis of morphological characters, to test the distinctiveness of V. coatlicue. Little genetic variability and no geographic structuring were recovered. Additionally, putatively diagnostic morphological character states were present across both species, failing to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cichlid; Freshwater; Mexico; River; Taxonomy. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000200204 |
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| Mercado-Silva,Norman; Lyons,John; Moncayo-Estrada,Rodrigo; Gesundheit,Pablo; Krabbenhoft,Trevor J.; Powell,Daniel L.; Piller,Kyle R.. |
| 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 showed generally overlapping trophic niches for members of Chirostoma, especially in terms of δ13C. However, C. jordani had lower mean δ15N isotopic values than C. promelas. As a group, "pescados blancos" (C. sphyraena and C. promelas) also had higher... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Charales; Food web; Menidini; Pescadoblanco; Shallow lake. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000200389 |
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