The degree of biodiversity was dynamically changing during the centuries and millennia, according to available resources it was gradually growing. In the course of evolution the periods of intensive speciation and relative “speciation rest“ were alternating, with five major episodes of mass extinction (Wilson, 1989; Raup, 1992). The worst extinction event took place at the end of the Permian pe...

The ichthyological biodiversity of Polish lakes is poorly understood, even in not used for fishing and those under strict protection. With this mind, the aim study was to conduct a comprehensive survey several Wolin National Park (Poland). conducted Domysławskie Gardno anthropogenic Stara Kredownia reservoir. Each exercise using benthic nets over 12 h period. fish caught were measured weighed, ...

Fish diets are important indicators of ecosystem change. This aspect the ichthyofauna coast Argentine Islands has been insufficiently studied in comparison with other regions. article presents results dietary and somatic parameters dominant species Notothenia coriiceps depending on point, depth season catch. The sample was collected between February 2006 2007. In year study, N. coriiceps, Trema...

During a survey of Gahar Lake and Gahar River from 2008 to 2009 some specimen obtained by seasonal sampling in 6 stations, 3 stations in the lake and 3 stations in the river. Three different methods were used for sampling, gill net and hook in the lake and electrofishing in the river. Due to the results 3 species from 2 families in Gahar Lake and 12 species form 3 families in Gahar River were...

During a survey of Gahar Lake and Gahar River from 2008 to 2009 some specimen obtained by seasonal sampling in 6 stations, 3 stations in the lake and 3 stations in the river. Three different methods were used for sampling, gill net and hook in the lake and electrofishing in the river. Due to the results 3 species from 2 families in Gahar Lake and 12 species form 3 families in Gahar River were...