Peces arrecifales someros en el islote rocoso La Viuda, Golfo Dulce, Costa Rica / Shallow reef fishes around "La Viuda" rocky islet, Golfo Dulce, Costa Rica

Resumen Los arrecifes rocosos proveen una alta diversidad de organismos. Se presentaron cambios en la estructura de la comunidad íctica a lo largo de la estación climática y la acción del oleaje. Este estudio evaluó la diversidad y la abundancia de los peces del arrecife rocoso La Viuda, Golfo Dulce, Costa Rica (8°37'33" N - 83°14'08" W). Los peces fueron estudiados con el método de Bohnsack y Bannerot comparando las estaciones seca y lluviosa, las zonas protegidas y expuestas al oleaje usando índices ecológicos. El total de especies fue 28, las familias más abundantes fueron Pomacentridae y Labridae. La diversidad de Shannon-Wiener resultó entre 1,1 y 1,73 nits/ ind. El índice de Pielou en La Viuda fue 0.43. Se encontró mayor diversidad de especies en la época seca y en la zona protegida al oleaje.

Abstract Rocky reefs maintain a high diversity of organisms. Differences in fish community could be expected by seasonal events and wave action on rocky reefs. I studied "La Viuda" rocky islet, Golfo Dulce, CostA Rica (8°37'33" N - 83°14'08" W) with Bohnsack and Bannerot visual census methods four times between February and December 2002. I identified 28 species and the most abundant families were Pomacentridae and Labridae. Shannon-Wiener diversity was between 1.1 and 1.73 nits/ind., and Pielou 0.43. There is a higher diversity in the dry season and in areas protected from wave action. Rev. Biol. Trop. 63 (Suppl. 1): 329-338. Epub 2015 April 01.

Evaluation of trophic state of lake Uluabat, Turkey.

Lake Uluabat, which is located in Marmara region, is one of the most productive lakes in Turkey. Due to concerns about potential pollution resulting from watershed sources and adjacent agricultural lands, a study of the trophic state of lake Uluabat was conducted during the period February 2003 to January 2004. Total nitrogen (TN), total phosphorus (TP), Secchi disc depth (SD) and chlorophyll a (Chl a) were analyzed monthly in order to assess the trophic state of the lake. According to calculated nutrient ratios, phosphorus was found to be the primary limiting nutrient in lake Uluabat. Carlson’s trophic state index values, based on TP, SD and chl a, indicated that lake Uluabat is an eutrophic system.