Reproducción de los peces en embalses en cascada en un río andino tropical (Colombia) ResumenLa variación de las lluvias y el nivel de los ríos han sido identifi cados como los factores más importantes para la reproducción de los peces de agua dulce en el trópico. Las presas y embalses cambian la infl uencia de estos dos factores, por lo tanto, el ensamblaje debe desarrollar nuevas tácticas para continuar reproduciéndose. Nuestro objetivo fue defi nir los periodos y sitios de reproducción del ensamblaje de peces en la cuenca media del río Porce (Antioquia, Colombia), modifi cado por dos embalses en cascada (embalses Porce II y Porce III). Los muestreos se realizaron entre septiembre de 2011 y diciembre de 2016, durante periodos climáticos contrastantes (lluvias y estiajes), en 31 sitios distribuidos en los embalses de Porc e II y Porce III, en el canal del río (antes del embalse Porce II entre los embalses y después del embalse Porce III) y quebradas tributarias a los dos embalses. Los peces fueron capturados con trasmallo, atarraya y electropesca. Se usó la escala de Vazzoler (1996) para determinar el desarrollo gonadal y se estimó la relación gonadosomática; estos datos se utilizaron para hacer los análisis de la temporalidad reproductiva del ensamblaje de peces, que se defi nió de acuerdo con la intensidad reproductiva (IR) y el porcentaje de ínvidos maduros de las especies. Los resultados mostraron que en los embalses los peces se reproducen intensamente independiente del periodo climático, mientras en las quebradas y el río se observa una tendencia similar, aunque con un incremento de la reproducción asociado con los periodos de estiaje; de manera particular se encontró que la especie Brycon henni tiene un mayor porcentaje de individuos maduros durante los periodos de lluvias en el embalse Porce III y en sus quebradas tributarias. AbstractVariations in rainfall and river level have been identifi ed as the most crucial factors in freshwater fi sh reproduction in the tropics. Dams and reservoirs change the seasonality of these factors, so fi sh must develop new tactics to continue reproducing themselves. Our objective was to defi ne the period and sites of reproduction of fi sh in the middle Porce River drainage, which has been modifi ed by the construction of two reservoirs in cascade (reservoirs Porce II and Porce III). Sampling was carried out from September 2011 to December 2016, during contrasting climatic periods (drought and rains) at 31 sites distributed as follows: in the reservoirs of Porce II and Porce III, in the river channel (above Porce II reservoir, between the reservoirs and below Porce III dam) and tributary streams to two reservoirs. The fi sh were captured with gillnet, seines and electro-fi shing gear. The Vazzoler scale (1996) was used to determine the gonadal development, the gonadosomatic relationship was also estimated and these data were used to make the analysis of the reproductive seasonality of the fi sh assemblage, which was defi ned according to the reproductive intensity (RI) a...
Chocó-Darien is an important biogeographic realm, as it is a terrestrial biodiversity hotspot and the southern limit of the Caribbean reefs. However, to date there are no compiled data on the reef fish assemblage of this region. We provide an updated checklist of marine fishes from the Chocó-Darien reef system (Colombia), with comments on their geographic distribution and conservation status. Peer-reviewed studies, unpublished data and in situ visual censuses were surveyed to compose this checklist. A total of 212 reef fish species across 57 families were compiled, eight of which had no previously published records, one of which (Trachinotus falcatus) is recorded for the first time. The most speciose families were Labridae (n = 21), Gobiidae (n = 18) and Serranidae (n = 17). Fourteen threatened species were recorded, including one critically endangered (Epinephelus striatus) and two endangered (Balistes vetula and Scarus coelestinus). This study contributes to fill the knowledge gaps on the reef fish diversity of the Caribbean southern limit and raises concern on the spread of the lionfish invasion into the Chocó-Darién reef system.
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