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No. de sistema: 000021437

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008 _ _ 190410m20199999xx^^r^p^o^^^^z0^^^a0eng^d
040 _ _ a| ECO
c| ECO
043 _ _ a| n-mx-cp
a| n-mx-tb
044 _ _ a| xx
245 0 0 a| Trophic structure of fish assemblages varies across a Mesoamerican river network with contrasting climate and flow conditions
506 _ _ a| Disponible para usuarios de ECOSUR con su clave de acceso
520 1 _ a| Assessments of trophic diversity are critical for evaluating ecological integrity of habitats, but interpretations of such assessments require an understanding of variation across natural environmental gradients. This can be problematic when comparing structure of assemblages in under-studied regions or habitats, such as watersheds in dry tropical forests. Here,we compared assemblage-wide trophic metrics and intraspecific variation for a subset of consumer traits across rivers and among different ecosystem types within the Grijalva and Usumacinta River basins of Mexico. The two rivers differ with respect to flow-regime alteration and climate: the Grijalva River has been hydrologically altered by a series of dams and has wet and dry tropical forests in its watershed, whereas the Usumacinta River remains unimpounded with a watershed dominated by tropical wet forest. Use of allochthonous resourceswas pervasive in Usumacinta basin tributaries,with stable isotope signatures suggesting that many fishes directly consumed riparian plants and detritus. In contrast, fish assemblages inGrijalva basin tributaries were supported by higher proportions of in-stream production. Food-chain length was highest in a Grijalva River reservoir fish assemblage, although trophic diversity was lowin the impounded systemcompared to the mainstem Usumacinta River, where fishes consumed the broadest variety of food resources. We also observed differences in trophic ecology and body nutrient content within taxa across habitat types and basins. The differences we observed suggest that even in relatively intact watersheds, expectations for trophic structure in tropical streams should be adjusted based on factors such as discharge, climate, and riparian forest cover.
533 _ _ a| Reproducción electrónica en formato PDF
538 _ _ a| Adobe Acrobat profesional 6.0 o superior
650 _ 4 a| Astyanax
650 _ 4 a| Poecilia mexicana
650 _ 4 a| Peces tropicales
650 _ 4 a| Cadenas de alimentación (Ecología)
650 _ 4 a| Ecología ribereña
651 _ 4 a| Cuenca Grijalva
651 _ 4 a| Cuenca del Río Usumacinta
700 1 _ a| Pease, Allison A.
e| autora
700 1 _ a| Capps, Krista A.
e| autora
700 1 _ a| Rodiles Hernández, María del Rocío
d| 1956-
e| autora
700 1 _ a| Castillo Uzcanga, María Mercedes
e| autora
n| 7202200847
700 1 _ a| Mendoza Carranza, Manuel
c| Dr.
e| autor
700 1 _ a| Soria Barreto, Miriam
e| autora
700 1 _ a| González Díaz, Alfonso Ángel
e| autor
773 0 _
t| Food Webs
g| Vol. 18, no. e00113 (March 2019), p.
x| 2352-2496
900 _ _ a| Solicítelo con su bibliotecario/a
901 _ _ a| Artículo con arbitraje
902 _ _ a| GOG / MM
904 _ _ a| Abril 2019
905 _ _ a| Artecosur
905 _ _ a| Artfrosur
905 _ _ a| Biblioelectrónica
906 _ _ a| Producción Académica ECOSUR
LNG eng
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*Solicítelo con su bibliotecario/a
Trophic structure of fish assemblages varies across a Mesoamerican river network with contrasting climate and flow conditions
Pease, Allison A. (autora)
Capps, Krista A. (autora)
Rodiles Hernández, María del Rocío, 1956- (autora)
Castillo Uzcanga, María Mercedes (autora)
Mendoza Carranza, Manuel (autor)
Soria Barreto, Miriam (autora)
González Díaz, Alfonso Ángel (autor)
Nota: Disponible para usuarios de ECOSUR con su clave de acceso
Contenido en: Food Webs. Vol. 18, no. e00113 (March 2019), p.. ISSN: 2352-2496
No. de sistema: 21437
Tipo: - Artículo con arbitraje
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Inglés

"Assessments of trophic diversity are critical for evaluating ecological integrity of habitats, but interpretations of such assessments require an understanding of variation across natural environmental gradients. This can be problematic when comparing structure of assemblages in under-studied regions or habitats, such as watersheds in dry tropical forests. Here,we compared assemblage-wide trophic metrics and intraspecific variation for a subset of consumer traits across rivers and among different ecosystem types within the Grijalva and Usumacinta River basins of Mexico. The two rivers differ with respect to flow-regime alteration and climate: the Grijalva River has been hydrologically altered by a series of dams and has wet and dry tropical forests in its watershed, whereas the Usumacinta River remains unimpounded with a watershed dominated by tropical wet forest. Use of allochthonous resourceswas pervasive in Usumacinta basin tributaries,with stable isotope signatures suggesting that many fishes directly consumed riparian plants and detritus. In contrast, fish assemblages inGrijalva basin tributaries were supported by higher proportions of in-stream production. Food-chain length was highest in a Grijalva River reservoir fish assemblage, although trophic diversity was lowin the impounded systemcompared to the mainstem Usumacinta River, where fishes consumed the broadest variety of food resources. We also observed differences in trophic ecology and body nutrient content within taxa across habitat types and basins. The differences we observed suggest that even in relatively intact watersheds, expectations for trophic structure in tropical streams should be adjusted based on factors such as discharge, climate, and riparian forest cover."


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