Resumen

YUNOKI, T et al. Cambio Estacional de la Estructura de Comunidades Ictícolas en Relación a la Conectividad y Cobertura Vegetal en Pozas Artificiales en la Amazonia Boliviana. Rev.Cient.Agro.Amaz. [online]. 2013, vol.1, n.1, pp. 1-10. ISSN 2307-9606.

ABSTRACT The present study describes the seasonal change of fish assemblage structure related to the connectivity and the vegetation cover (VC) in artificial ponds of Mojos plain, also suggests the ecological processes that operate in different spatial - temporal scales. Monthly samples were collected during two hydrologic cycles between 2009 and 2011. Samples were collected in two isolated ponds and two connected ponds during the first year; the second year, samples were collected from another two isolated and two connected ponds. Four different treatments each year. The Detrended Correspondence Analysis (DCA) shows the hierarchical organization where the connectivity by means of the association of life history strategies controls in large spatial scale between the connected ponds and also isolated ponds. Moreover, the VC through the adaptation to the aerial breathing controls in small spatial scale among the connected or isolated pools during water decrease. Evenmore, during annual flood, the homogenization of fish assemblage structures was observed, due to the reduction of fish and dom inance of very small tetras. The association of the three life history strategies to the spatial heterogeneity originated by connectivity is not permanent during the water cycle. Small fish probably associated to the opportunistic strategy, colonize all ponds during annual flood, but do not persist during dry season where predation rate is high. Large fish, probably associated to the periodic strategy, require the annual flood and they persist during dry season.

Palabras llave : life history strategy; annual flood; fish assemblage structure.