2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/25/2021 | 2:00 PM - 3:30 PM | Larval morphological variation in the giant salmonfly Pteronarcys californica | Virtual Platform

Larval morphological variation in the giant salmonfly Pteronarcys californica

While DNA-based analyses are increasingly being used to assess population genetic structure and infer biodiversity of aquatic invertebrates, the vast majority of bioassessment programs and biodiversity surveys still reply upon morphology-based identifications. Here we report the results of an investigation into morphological variation that supports previous findings of distinct clades with low gene flow from a study of population genetic structure of the giant salmonfly (Pteronarcys californica), a large-bodied stonefly distributed throughout western North America. Morphometric analysis of the larval pronotum indicates significant differences between populations south of San Francisco Bay in Central California and all other sampled populations from the western U.S., especially with regards to the size and shape of the pronotal projections. This morphological variation supports the findings of previous research on population genetic structure in P. californica, which similarly identified a deep phylogenetic split north and south of the SF Bay area. Taken together, the morphological and genetic data suggest that the isolated populations in habitats south of San Francisco Bay, which face vulnerability related to drought, fire, and climate change, should represent an important conservation concern for aquatic biodiversity.

Conservation
Stream
Aquatic–terrestrial biodiversity

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Presenters/Authors

Adersin Vartanyan (), CSU Stanislaus, avartanyan@csustan.edu;