Conspecific chemical cues facilitate mate trailing by invasive Argentine black and white tegus


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

Meeting Abstract


11-7  Sat Jan 2  Conspecific chemical cues facilitate mate trailing by invasive Argentine black and white tegus Bukovich, IMG*; Richard, SA; Tillman, EA; Jayamohan, S; Humphrey, JS; Carrington, PE; Bruce, WE; Kluever, BM; Avery, ML; Parker, MR; James Madison University, Harrisonburg, VA; James Madison University, Harrisonburg, VA; USDA APHIS NWRC, Gainesville, FL; James Madison University, Harrisonburg, VA; USDA APHIS NWRC, Gainesville, FL; James Madison University, Harrisonburg, VA; USDA APHIS NWRC, Gainesville, FL; USDA APHIS NWRC, Gainesville, FL; USDA APHIS NWRC, Gainesville, FL; James Madison University, Harrisonburg, VA bukoviim@dukes.jmu.edu

Squamate reptiles (snakes and lizards) rely on chemical cues from conspecifics to search the environment for potential mates. How such cues are used by invasive species in reproduction is a key question in multiple, independent invasions throughout the Southeastern U.S. The Argentine black and white tegu lizard (Salvator merianae) is an invasive reptile species in south Florida threatening native fauna in biodiverse regions such as Everglades National Park. By testing both male (n = 7) and female (n = 7) tegus in a Y-maze apparatus, we assessed if either sex follows chemical trails left by conspecifics and if behaviors were sex- or season-specific. We conducted three types of trials where conspecifics created odor trails: Male-only (male scent only in base and one arm of Y), Female-only, and Male vs. female. Males did not preferentially follow scent trails from either sex, but they did differentially investigate conspecific scent from both sexes. Males also had reduced turning and pausing behavior while trailing in the spring and showed seasonal upregulation of chemosensory sampling in spring. Female tegus exhibited stronger conspecific trailing abilities than males, following both male and female scent trails, and they explored the maze less before making an arm choice. Females also investigated the scent trails intensely compared to males (more passes in scented arms, more time with scent trails). Our results demonstrate for the first time than females of an invasive reptile species can follow conspecific scent trails and provide potential avenues for development of control tools.

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