The role of anthropogenic vs. natural in-stream structures in determining connectivity and genetic diversity in an endangered freshwater fish, Macquarie perch (Macquaria australasica).

摘要: Habitat fragmentation is one of the leading causes population declines, threatening ecosystems worldwide. Freshwater taxa may be particularly sensitive to habitat loss as connectivity between suitable patches restricted not only by natural stream network but also anthropogenic factors. Using a landscape genetics approach, we assessed impact availability on genetic diversity and an endangered Australian freshwater fish Macquarie perch, Macquaria australasica (Percichthyidae). The relative contribution versus in-stream structures in shaping structure M. was quite striking. Genetic significantly higher locations with river slope, correlate species preferred – riffles. On other hand, barriers degrade impede dispersal, contributing degree differentiation among populations. Our results highlight importance understanding environmental factors affecting populations potential practical application this approach conservation management organisms.