Ichthyofauna in a terra firme forest stream of the Colombian Amazonia

[Walter]

ARBELÁEZ, F., GÁLVIS, G., MOJICA, J.I. & S. DUQUE:
Composition and richnes of the ichthyofauna in a terra firme forest stream of the Colombian Amazonia
AMAZONIANA XVIII (1/2), 2004, 95-107

Abstract:
An intensive inventory of the ichthyofaune in a small terra firme forest stream of the Comlubian Amazonia was carried out to examine the ichthyological composition of these environments and to identify patterns of fish species permanency during the seasonal cycle. One houndred and nine fish species were collected, which is the highest recorded number of species for this kind of environments in the Amazonia. Richness estimators showed that more than 87 % of the estimated species have been captured. Permanency analyses indicated that 44 species were permanent and only six species were seasonal, suggesting a low seasonal variation of the species composition during the year. Finally, high species richness is discussed in relation to key ecological factors such as productifity, habitat heterogeneity, climatic viariability, harshness, environmental age and biogeographic area.

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