Dispersal, disturbance and the contrasting biogeographies of New Zealand's diadromous and non-diadromous fish species

Abstract

To examine the relationship between diadromy and dispersal ability in New Zealand's freshwater fish fauna, and how this affects the current environmental and geographic distributions of both diadromous and non-diadromous species. New Zealand. Capture data for 15 diadromous and 15 non-diadromous fish species from 13,369 sites throughout New Zealand were analysed to establish features of their geographic ranges. Statistical models were used to determine the main environmental correlates of species' distributions, and to establish the environmental conditions preferred by each species. Environmental predictors, chosen for their functional relevance, were derived from an extensive GIS database d..