Consistent nest site selection by turtles across sites with varying levels of human disturbance


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

Meeting Abstract


P34-7  Sat Jan 2  Consistent nest site selection by turtles across sites with varying levels of human disturbance Caldwell, MF*; Lopez-Perez, JE; Warner, DA; Wolak, ME; Auburn University, AL; Eckerd College, St. Petersburg, FL; Auburn University, AL; Auburn University, AL mmf0009@auburn.edu

Human disturbance impacts the breeding behavior of many species, and it is particularly important to understand how human-caused changes affect vulnerable taxa such as turtles. Habitat alteration can change the amount and quality of suitable nesting habitat, while human presence during nesting may influence nesting behavior. Consequently, both habitat alteration and human presence can influence the qualities of a site that females select for nesting. In summer 2019, we located emydid turtle nests in Macon and Lee counties, AL, at three site types (high, intermediate, and low levels of human disturbance). We built linear mixed-effects models to determine the relationship between site type and maternal microhabitat selection, and to determine if turtles selected sites differently than what was randomly available. We found a significant effect of site type on the slope, canopy, and average nest temperature. Additionally, maternally-selected nest sites had less variance in canopy cover than randomly-chosen sites. Results suggest that turtles discriminate among abiotic factors when selecting nest sites, but that turtles are generally selecting sites with similar microhabitat at each disturbance level. These results suggest that turtles are not adjusting their nesting choices when faced with anthropogenic change, highlighting the importance of preserving natural areas.

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