Poster Presentation Society for Freshwater Science 2026 Annual Meeting

Disentangling climate vulnerability in lentic and lotic odonates using trait-based and geographic metrics (136105)

Wade A Boys 1 , Clay Prater 1 , Michelle A Evans-White 1
  1. University of Arkansas, AR, United States

Freshwater biodiversity is declining faster than any other ecosystem type. Compared to vertebrates, freshwater insects are often left out of large-scale assessments of vulnerability to climate change. Previous work suggests that lotic species are more vulnerable to climate change than lentic species, possibly due to smaller geographic range sizes and greater habitat specialization. Most metrics of climate change vulnerability are derived from either a trait- or geographic-based approach, however combining these two approaches could help illuminate the relationships between species traits, geographic distributions, and their interaction with the scale of assessment. We used the geographic-based Rarity and Climate Sensitivity Index (RCS) to estimate intrinsic sensitivities for over 500 odonate species in the Nearctic realm at three different spatial extents: major river basins, sub-basins, and catchments. We also included biological traits known to influence odonate sensitivities and extinction risk under climate change and assessed their utility in predicting the geographically-derived RCS scores. RCS scores were more congruent across spatial scales for lentic species of both dragonflies and damselflies compared to lotic species. Preliminary results suggest limited utility of biological traits in predicting intrinsic climate sensitivities for both lentic and lotic species at the catchment scale but may be useful at larger scales. This discrepancy demonstrates the importance of conducting vulnerability assessments derived from different approaches at multiple scales. Indeed, such an approach can help managers determine if sensitive species within a focal region are also sensitive more broadly, thus helping inform decisions of resource allocation towards species conservation.