Groundfish species diversity and assemblage structure in Icelandic waters during recent years of warming

摘要: Elevated ocean temperatures have been predicted to lead a poleward shift in the latitudinal distribution ranges of fish species. Different responses species increased might changes assemblage structure and local richness. In this study, diversity groundfish Icelandic waters were examined using data from standardized survey conducted annually 1996–2007. We used hierarchical cluster analysis define assemblages two time periods canonical correspondence explore relationships between temperature, depth, latitude, longitude year. further estimates diversity, richness Shannon index. Four major identified. Assemblages hydrographically stable deep north country consistent during while more variable shallow underwent some changes. For period generally increasing sea also revealed towards representative warmer temperatures. Diversity was shown be highly both temporally spatially, vary with depth temperature. Species temperature southwest country, but decreased northeast country. The different trends detected northern southern areas illustrate importance performing analyses at most appropriate scale.