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Downsizing for downtown: Limb lengths, toe lengths, and scale counts decrease with urbanization in western fence

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Urbanization impacts western fence lizards (Sceloporus occidentalis), causing morphological changes like shorter limbs and fewer scales. These adaptations reflect altered habitat use in urban environments, highlighting varied responses to development.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Urban Ecology

Background:

  • Urbanization poses significant threats to species survival due to habitat loss and alteration.
  • Reptile research on urbanization impacts has been limited, necessitating broader investigation.
  • Understanding species-specific responses is crucial for effective wildlife conservation in changing landscapes.

Purpose of the Study:

  • To investigate morphological differences in western fence lizard (Sceloporus occidentalis) populations across varying urbanization levels.
  • To determine if observed morphological variations correlate with habitat use and environmental characteristics in urbanized areas.
  • To assess the adaptive capacity of a common reptile species to urban pressures.

Main Methods:

  • Quantified habitat characteristics across four sites in Los Angeles County with differing urbanization levels.
  • Measured microhabitat use by western fence lizards in natural, suburban, and urban environments.
  • Assessed morphological variations including body size, limb length, toe length, and scalation in collected lizard specimens.

Main Results:

  • Urban and suburban lizards predominantly utilized human-made substrates, unlike lizards from natural areas using woody substrates.
  • Lizards from the most urban site displayed the broadest range of substrate use, suggesting microhabitat variability.
  • Urban lizards exhibited reduced limb and toe lengths and fewer dorsal scales, correlating with microhabitat use and increased impervious surface cover.

Conclusions:

  • Western fence lizards demonstrate morphological adaptations to urbanization, including limb and scale modifications linked to altered habitat use and environmental factors like the urban heat island effect.
  • These findings differ from previous lizard studies, emphasizing the need for research across diverse taxa to understand varied adaptation pathways.
  • The study underscores the importance of considering species-specific responses for wildlife conservation strategies in urbanizing regions.