Feeding Ecology of Hypostomus Punctatus in Costal Stream from Foutheast Brazil

3490 WordsAug 19, 201414 Pages
Feeding ecology of Hypostomus punctatus Valenciennes, 1840 (Osteichthyes, Loricariidae) in a costal stream from Southeast Brazil Mazzoni, R.*, Rezende, CF. and Manna, LR. Laboratório de Ecologia de Peixes , Departamento de Ecologia, Universidade do Estado do Rio de Janeiro – IBRAG, Rua São Francisco Xavier, 524, CEP 20550-013, Rio de Janeiro, RJ, Brazil *e-mail mazzoni@uerj.br Received June 25, 2009 – Accepted September 18, 2009 – Distributed August 31, 2010 (With 3 figures) Abstract In the present study we aimed to compare the feeding ecology of Hypostomus punctatus from a coastal stream from Southeast Brazil with data previously published for the same study site before environmental changes. Feeding preferences were assessed…show more content…
Mazzoni and 569 Mazzoni, R., Rezende, CF. and Manna, LR. Iglesias-Rios, 2007). It composes an area where conservation studies are quite recommended (Mazzoni et al., 2000; Myers et al., 2000) and trophic studies should help in the development of managing strategies (Windell and Bowen, 1978; Royce, 1996). The present study is part of a wide research programme on the trophic ecology of stream dwelling-fishes from the East Atlantic basin and aimed to analyse the feeding ecology of H. punctatus from one site of Mato Grosso stream and compare it with the data obtained by Costa (1987) who worked at the same site. The results obtained would be addressed in a wide context of feeding habits associated to environmental changes. water discharge at Lagoa de Saquarema (Figure 1). It is a typical coastal stream with water levels solely regulated by rainfall (~1500 mm.yr-1) and run-off with abundant summer (November/March) rain accentuating water fluctuations; nonetheless, tropical storms (>120 mm in a day) are very common throughout the year. Mato Grosso stream flows through meadows deforested for agricultural practises and cattle breeding and has been changing its course because of sand extraction in its lowland areas. 2.2. Data collection and analysis Bimonthly samples, between March/2006 and February/2007, were done by picarés (mesh size 0.5 mm) in a 100 m long stretch in the lowlands of Mato Grosso stream. Sample site was

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