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| Carbajal-Becerra,Omar; Olvera-Rodríguez,Karla Judith; Souza,Gabriel Mariscal de; Durán-Rodríguez,Omar Yair; Ramírez-García,Arely; Ramírez-Herrejón,Juan Pablo. |
| ABSTRACT Pseudoxiphophorus bimaculatus is an invasive species widely spread throughout freshwater ecosystems in central Mexico, for that reason we described its trophic strategy into a gradient of environmental quality. We sampled individuals of P. bimaculatus at eight sites located in the Lerma-Chapala and Pánuco River Basins during dry season. These basins have been impacted by industrialization and urbanization processes, but are considered as water reserves in México. To evaluate the environmental quality of the river, we applied the Visual-based Habitat Assessment, the Index of Biological Integrity and the Family-level Biotic Index. We assessed the trophic guild, the diet width, the omnivory level, and the diet selectivity. We also explored the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biological Invasions; Exotic Species; Feeding Ecology; Freshwater Ecosystems; Poecílidos. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000200201 |
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| Carvalho,Maria Raquel de; Soares,Lucy Satiko Hashimoto. |
| Diel changes in feeding activity and dietary composition of the rough scad Trachurus lathami were investigated through the analysis of stomach contents of 307 fish sampled over a 24-h period on the continental shelf off Ubatuba (23º 35'S 45ºW). Stomach contents were analyzed by frequency of occurrence (O%), percent number (N%), percent mass (M%), and feeding index (FI% = O% * M%). Rough scad fed on mollusks (Gastropoda, Crepidula sp.), crustacean (Ostracoda, Copepoda, decapod larvae), chaetognat and teleostean fish. The main items were calanoid copepods (Eucalanus sp. and Centropages sp.). According to the analysis of the stomach fullness and prey digestion, T. lathami is both a diurnal and nocturnal feeder, showing some seasonal variation in feeding time.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Food Habits; Feeding Ecology; Stomach Contents; Rhythms; Southeast Brazil. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000400005 |
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