2024-07-29 ワシントン大学セントルイス校
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<関連情報>
- https://artsci.wustl.edu/ampersand/ornamented-dragonflies-better-equipped-survive-human-threats
- https://onlinelibrary.wiley.com/doi/10.1111/ele.14455
人為的に改変された生息地は、装飾トンボにとって、地域的、大陸的なスケールにおいて、非装飾トンボよりも危険度が低い Human-modified habitats imperil ornamented dragonflies less than their non-ornamented counterparts at local, regional, and continental scales
Michael P. Moore, Noah T. Leith, Kasey D. Fowler-Finn, Kim A. Medley
Ecology Letters Published: 07 June 2024
DOI:https://doi.org/10.1111/ele.14455
Abstract
Biologists have long wondered how sexual ornamentation influences a species’ risk of extinction. Because the evolution of condition-dependent ornamentation can reduce intersexual conflict and accelerate the fixation of advantageous alleles, some theory predicts that ornamented taxa can be buffered against extinction in novel and/or stressful environments. Nevertheless, evidence from the wild remains limited. Here, we show that ornamented dragonflies are less vulnerable to extinction across multiple spatial scales. Population-occupancy models across the Western United States reveal that ornamented species have become more common relative to non-ornamented species over >100 years. Phylogenetic analyses indicate that ornamented species exhibit lower continent-wide extinction risk than non-ornamented species. Finally, spatial analyses of local dragonfly assemblages suggest that ornamented species possess advantages over non-ornamented taxa at living in habitats that have been converted to farms and cities. Together, these findings suggest that ornamented taxa are buffered against contemporary extinction at local, regional, and continental scales.
