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SFS Annual Meeting

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Log jams retain organic matter and increase habitat heterogeneity for different organisms that inhabit freshwater ecosystems. However, information on how log jams improve zooplankton diversity even when the log jam is located between the transition of the river and a reservoir is very limited. The log jam we study is located between the transition of the La Miel river and the Amani reservoir in Colombia. Sampling was carried out in February, October and December 2016, thus covering dry and wet seasons. When we were evaluating the three diversities (0D, 1D, 2D) among sites, we found the highest richness in the middle of the log jam. While among the sampling seasons we found that the richness showed highest richness in October and December (wet season) compared to February (dry season). On the other hand, spatial turnover and nesting contributed with similar percentage to beta diversity. This work demonstrate that the presence of log jams between the transition of a river and a reservoir is supporting the presence of higher diversity of zooplankton by increasing heterogeneity and food availability. Especially when zooplankton is composed of groups that differ in their niche requirements.

Yesica Velasques-Duque (Primary Presenter/Author), Department of Biology, Caldas University, Cl. 65 # 26-10, Manizales, Colombia.,;

Silvia Villabona-González (Co-Presenter/Co-Author), Department of Natural Sciences, Catholic University of Orient. Cr. 46-40 B-50, Rionegro, Colombia. ,;

Hilda Palacio (Co-Presenter/Co-Author), Facultad de Ciencias y Biotecnología, Programa de Biología y Ecología. Universidad CES. Cl. 10a #22 – 04, Medellín, Colombia;,;