| Summary: | This dataset includes the scripts to reproduce the models presented in the paper as well as the four figures. The cleaned data used for the analyses is also available. Abstract: - Dispersal abilities are important to support metapopulation functioning and species distributions. Therefore, dispersal should be considered in conservation due to the ongoing anthropogenic pressures on natural habitats, like on wetlands. We compared the propensity for dispersal between the two fishing spiders present in Europe: the widespread habitat-generalist Dolomedes fimbriatus, and the scarcer red-listed Dolomedes plantarius. - We experimentally tested for airborne and waterborne dispersal using first instar juveniles sampled in nursery webs, and older juveniles. We estimated the propensity for short and long-distance dispersal of airborne and waterborne behaviours and tested the difference between species with generalised linear mixed models. - Airborne (ballooning) and waterborne (sailing) behaviours were more frequent for D. fimbriatus than for D. plantarius, indicating a higher propensity of the former for long-distance dispersal. - The frequency of rappelling behaviour, and thus the propensity for short-distance dispersal, did not differ between species. However, we found contrasting results for short-distance dispersal on the water, with rowing being more frequent and running less frequent for D. plantarius than for D. fimbriatus. - The different propensity for dispersal between the two species might be partly explained by the ecology of D. plantarius, which is known to be more habitat-specialist and more dependent to water bodies than D. fimbriatus. - The limited propensity for dispersal of the red-listed D. plantarius is another argument for conserving an interconnected network of wetlands in Fennoscandia. Indeed, increased isolation of populations would be detrimental for species maintenance.
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