Relación entre comunidad íctica y cobertura vegetal riparia en períodos hidrológicos (Eje Cafetero, Colombia)

Abstract

<p><strong>Objective.</strong> To assess the relationship between structure and diet of the fish community and the riparian vegetation cover (RVC), in two hydrological periods (HYPE) in streams of the La Vieja river basin. <strong>Materials and methods.</strong> Collections were done with electrofishing and <em>rapiché </em>in March and May 2010. Efficiency of sampling effort was assessed with the estimator Chao2. Structure was analyzed using the indices of richness, dominance, diversity and evenness which were compared with an ANOVA. Gastrointestinal contents were analysed with the indices of vacuity coefficient, frequency, volume and food importance. We examined the relationship among diet, HYPE and RVC using the multiple correlation coefficient (r), the coefficient of determination (r<sup>2</sup>) and a Canonical Correspondence Analysis (CCA). <strong>Results.</strong> According to the Chao2 estimator, in most streams the fish species richness values are representative. There were no significant differences (P>0.05) among the structural variables, the HYPE and the RVC. According to r and r<sup>2</sup> the diet of most fish species did not vary as a function of RVC and HYPE; however, according to the CCA diet varies as a function of HYPE but not of RVC. <strong>Conclusions.</strong> The fish community structure did not show changes according to RVC and HYPE. Although most species showed no changes in their diet, the community did show changes in diet according to HYPE, due to a change in composition; however diet changes were not detected by RVC.</p> <p><strong>Key words:</strong> coffee-growing region, diet, fish community, hydrological period, riparian vegetation cover, structure.</p><br />

Spatial and temporal variation of fish assemblage associated with aquatic macrophyte patches in the littoral zone of the Ayapel Swamp Complex, Colombia

“…In Colombia, knowledge of ecology in the swamps is incipient and fish research has focused on fisheries, given their economic importance for riverside communities that derive their livelihood from this activity ). Only three studies considering the relationship between fish and aquatic vegetation have been conducted in Colombian aquatic environments (Correa, 2008;Rivera-Rondón et al, 2008, Pérez-Mayorga & Prada-Pedreros, 2011. Apart from the study conducted by Ríos-Pulgarín et al (2008), no systematic investigation of the fish fauna associated e espaciais mostraram uma variação de condições ambientais que realça a existência de condições heterogêneas (p<0,05).…”