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Updated: May 24, 2026

Using Enclosed Y-Mazes to Assess Chemosensory Behavior in Reptiles
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Published on: April 7, 2021

Ecological release in White Sands lizards.

S Des Roches, J M Robertson, L J Harmon

    Ecology and Evolution
    |March 7, 2012
    PubMed
    Summary
    This summary is machine-generated.

    Ecological opportunity allowed three lizard species to thrive in White Sands, New Mexico. While density and resource use increased, trait variation did not, challenging ecological release predictions.

    Keywords:
    AdaptationWhite Sandscolonizationdensity compensationecological opportunityecological releasenatural selectionreptilesselectionspeciation

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    Area of Science:

    • Ecology
    • Evolutionary Biology
    • Herpetology

    Background:

    • Ecological opportunity, a release from competition and predation, can lead to ecological release.
    • Ecological release encompasses population size expansion, resource use broadening, and morphological variation increase.
    • Colonization of novel environments provides a natural experiment to study these ecological dynamics.

    Purpose of the Study:

    • To identify ecological opportunity and test for ecological release in three lizard species colonizing White Sands, New Mexico.
    • To investigate the impact of reduced predation and competition on lizard populations.
    • To compare observed trait changes with predictions from ecological release models.

    Main Methods:

    • Assessed ecological opportunity by comparing species richness and predator/competitor abundance at White Sands versus adjacent dark soil habitats.
    • Quantified ecological release by examining density compensation and resource use in the three lizard species (Sceloporus undulatus, Holbrookia maculata, Aspidoscelis inornata).
    • Analyzed trait variation and directional change in Sceloporus undulatus populations.

    Main Results:

    • Evidence of ecological opportunity was found, with lower species richness and abundance of competitors/predators at White Sands.
    • Density compensation was observed in all three lizard species at White Sands.
    • Sceloporus undulatus exhibited expanded resource use but showed directional trait change rather than increased trait variation.

    Conclusions:

    • Ecological opportunity and subsequent ecological release can be identified in natural populations, particularly in isolated ecosystems.
    • Colonization of White Sands provided a unique setting to study lizard adaptation and ecological release.
    • The study highlights that ecological release may involve directional trait change without necessarily increasing overall trait variation.