2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/08/2017 | 11:00 AM - 11:15 AM | CRAY CRAY MORPHOMETRICS - ADVANCING MORPHOLOGICAL SPECIES DELIMITATION OF CRAYFISH | 305A
CRAY CRAY MORPHOMETRICS - ADVANCING MORPHOLOGICAL SPECIES DELIMITATION OF CRAYFISH
Crayfishes are considered one of the most imperiled groups of freshwater organisms in the U.S. Effective conservation is predicated on reliable identification of species. Crayfishes typically are distinguished using a suite of morphological characters, both quantitative and qualitative, assumed to be consistent within, but variable among species; however, confident identification is often based on adult reproductive-form males, the presence of which is highly dependent on time of year. Further, increasing evidence suggests that key taxonomic characters may vary with environment. Our primary objective is to extend and automate a technique to examine variation in crayfishes. We compare landmark data among a set of readily distinguishable morphospecies and among populations within a widespread species complex (Cambarus robustus) using geometric morphometric analyses implemented in R. We are assessing results of clustering algorithms, lasso models, and random forest models for consistent species delimitation, and training Haar cascades on a Beowulf cluster to detect specific features for automated landmark placement. Our results will provide insight into how morphological characters vary across space, environment, and taxa, and in turn aid reliable identification of crayfish species.
- C12 Conservation Ecology
- S27 Advancing Consistency in Ecological Assessments
- S12 Challenges, insights, and opportunities in crayfish conservation and ecology
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Presenters/Authors
Melyssa Minto
(), Meredith College, NC Museum of Natural Sciences , msminto@email.meredith.edu;
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