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| Teresa,Fabrício Barreto; Souza,Luzia Shirlei de; Silva,Dianne Michelle Alves da; Barbosa,Hugo de Oliveira; Lima,Jane Dilvana; Nabout,João Carlos. |
| ABSTRACT Riffles are unique habitats regarding to assemblage structure. However, understanding how these assemblages respond to environmental variations in small spatial extents, as within a stream, is a challenge. We assess whether the quantitative structure and the trophic composition of fish assemblages vary predictably among stream riffles. We predict that the variation of environmental conditions will explain species abundance and trophic composition, with the latter presenting higher predictive power, since species would be filtered according to their traits (e.g. diet). Moreover, we expect that the low among-riffle dispersal limitation within a stream and the strong habitat filtering would result in lower importance of spatial variables in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Environmental filters; Mass effect; Mesohabitat; Metacommunity; Trophic composition. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000300206 |
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| Olguín,Pamela F.; Attademo,Andrés M.; Beltzer,Adolfo H.; Virgolini,Ana L. Ronchi; Lorenzón,Rodrigo; Caselli,Andrea; Arce,Sofía; Percara,Alejandro. |
| We examined the diet of the Rosy-billed Pochard, Netta peposaca (Vieillot, 1816), (n = 59) during the autumn of 2010 in Santa Fe province, Argentina. Were analyzed a total of 59 ducks (n = 37 females and n = 22 males) to assess their gastrointestinal contents. The trophic spectrum was composed of 16 taxa (plant fraction: animal fraction 9 and 7). The contribution of each food category estimated using the IRI was: Echynochloa sp. (Poaceae) = 4301, Polygonum sp. (Polygonaceae) = 956, and unidentified graminoid species = 53 (females: Echynochloa sp. = 4313, Polygonum sp. = 1095 and males: Echynochloa sp. = 5522, Polygonum sp. = 814). No significant differences were found between females and males in diet composition (Fisher's test, p < 0.05). Moreover, the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Stomach contents analysis; Rosy-billed Pochard; Trophic composition. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702014000100011 |
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