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Mechanisms of Movement Patterns: Physiology and Sex Influence Gopher Tortoise (Gopherus polyphemus) Movement
Karin Ebey1,2, Michael Hilton1, Jeffrey Goessling1
1Eckerd College Natural Sciences Collegium St. Petersburg Florida USA.
Ecology and Evolution
|July 1, 2026
Summary
Male and female Gopher Tortoises exhibit distinct movement strategies influenced by physiology and sex. Males display greater daily displacement and home range size, reflecting different mating system adaptations.
Area of Science:
- Spatial ecology
- Animal behavior
- Physiological ecology
Background:
- Animal movement patterns are shaped by exogenous and endogenous factors, with sex-based selection pressures influencing predictable variations.
- In polygynous species, males typically exhibit greater movement than females to maximize mating opportunities, while females are thought to favor smaller home ranges and site fidelity.
- Physiological constraints can influence movement patterns, potentially masking sex-specific selection dynamics.
Purpose of the Study:
- To investigate how Gopher Tortoise movement patterns are influenced by physiological factors and sex.
- To determine the relationship between physiological metrics (lactate concentration, body condition) and movement strategies (distance traveled, home range, burrow use).
Main Methods:
- Utilized GPS loggers to track Gopher Tortoise movement patterns.
- Conducted physiological assays to measure baseline and exercise-induced plasma lactate concentrations and body condition.
- Analyzed movement data including total distance, daily distance, maximum daily displacement, home range area, and burrow use.
Main Results:
- Total distance traveled was positively correlated with body condition and negatively with baseline lactate concentration, indicating physiological constraints on movement.
- No significant differences in total or daily distance traveled were observed between sexes.
- Males exhibited larger maximum daily displacements and home range areas compared to females.
Conclusions:
- Gopher Tortoise movement strategies differ between sexes, potentially reflecting adaptations to maximize fitness under distinct selection pressures within their scramble competition mating system.
- Physiological factors, particularly aerobic fitness, constrain overall movement distance.
- While overall movement distance may not differ, sex-specific differences in displacement and home range suggest varied spatial strategies.
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