Aim Insights into the biological and evolutionary traits of species, and their ability to cope with global changes, can be gained by studying genetic diversity within species. A cornerstone hypothesis in evolutionary and conservation biology suggests that genetic diversity decreases with decreasing population size, however, population size is difficult to estimate in threatened species with large distribution ranges, and evide...

Aim Factors that isolate populations and reduce gene flow are considered key drivers of speciation and possibly diversification. Here we analyse the diversification rates of nearly 80% of the actinopterygian fish families in relation to biological traits and habitat factors associated with isolation and fragmentation levels. Location Global. Methods Net diversification rate for each family was estimated using the method‐of‐mom...