Identifying climatic niche shifts using coarse‐grained occurrence data: a test with non‐native freshwater fish

摘要: Aim We tested whether coarse-grained occurrence data can be used to detect climatic niche shifts between native and non-native ranges for a set of widely introduced freshwater fishes. Location World-wide. Methods global database fish occurrences at the river basin scale identify 18 most species. also examined conditions within each using fine-grained climate data. combined this information test have occurred ranges. defined as instances where variable basins exhibit zero overlap. Results detected least one shift studied However, we did not common patterns in thermal preference or biogeographic origin fish, hence suggesting species-specific response. Main conclusions Coarse-grained shifts. They enable identification species experiencing shifts, although mechanisms responsible these (e.g. local adaptation, dispersal limitation physiological constraints) yet determined. Furthermore, approach, which highlights regions occurred, select specific more detailed, studies.