Geometric morphometric analysis of foot pad shape of salt marsh harvest mice and co-occurring rodents in the Suisun Marsh, California


SOCIETY FOR INTEGRATIVE AND COMPARATIVE BIOLOGY
2021 VIRTUAL ANNUAL MEETING (VAM)
January 3 – Febuary 28, 2021

Meeting Abstract


38-11  Sat Jan 2  Geometric morphometric analysis of foot pad shape of salt marsh harvest mice and co-occurring rodents in the Suisun Marsh, California Robles Martinez, D*; Sustaita, D; California State University San Marcos; California State University San Marcos roble055@cougars.csusm.edu

Differences in the foot morphology among species with different locomotion strategies have been previously described for the order Rodentia. In this study we used geometric morphometric analysis to compare the palmar and plantar pad configurations of salt marsh harvest mice (SMHM) and co-occurring rodents in Suisun Marsh, California. We hypothesized the SMHM would exhibit shorter and wider configurations for both palmar and plantar pads compared to co-occurring rodent species. This configuration type should provide greater contact surface for frictional support on vertical substrates which the SMHM uses to escape inundation. Preliminary Procrustes ANOVA analyses based on n=20 individuals indicated significant differences in plantar pad, but not palmar pad, configurations among species after controlling for allometry. However, the differences were contrary to what we hypothesized, in that SMHM plantar pads were relatively narrow and elongated compared to those of the California voles and house mice. Species appeared to group more by phylogeny in plantar pad shape morphospace, and more by locomotor behavior in palmar pad shape morphospace, suggesting some degree of independence in their potential responses to selective pressures. These preliminary results provide a foundation for investigating the specific role of foot pad shape in the locomotor performance of these species in their wetland habitat.

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