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Related Concept Videos

The Evidence for Evolution02:55

The Evidence for Evolution

Genetic variations accumulating within populations over generations give rise to biological evolution. Evolutionary changes can result in the formation of novel varieties and entire new species. These changes are responsible for the diverse forms of life inhabiting the planet. The evidence for evolution suggests that all living organisms descended from common ancestors.The collection of fossils within sedimentary rocks give a record of common ancestry and often depicts the history of evolution.
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Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.

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Field-Based Thermal Physiology Assay: Cold Shock Recovery under Ambient Conditions
07:54

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Published on: March 9, 2021

Testing ecological explanations for biogeographic boundaries.

Richard E Glor1, Dan Warren

  • 1Department of Biology, University of Rochester, Rochester, New York 14620, USA. richard.glor@rochester.edu

Evolution; International Journal of Organic Evolution
|November 9, 2010
PubMed
Summary

Biogeographic boundaries shape biodiversity. This study reveals unsuitable habitat ribbons maintain species boundaries, a key factor in evolutionary divergence, especially for Anolis lizards on Hispaniola.

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Area of Science:

  • Ecology
  • Biogeography
  • Evolutionary Biology

Background:

  • Biogeographic boundaries are crucial for understanding biodiversity patterns.
  • Differentiating ecological, historical, and stochastic factors in boundary formation is challenging.

Purpose of the Study:

  • To develop a framework for testing ecological explanations of biogeographic boundaries.
  • To investigate whether sharp environmental gradients or unsuitable habitat ribbons maintain species boundaries.

Main Methods:

  • Utilized environmental niche models and comparative metrics.
  • Tested hypotheses against a null model of random environmental variation.
  • Applied the framework to Hispaniolan Anolis lizards.

Main Results:

  • Identified a ribbon of unsuitable habitat as the primary driver of the Anolis lizard boundary.
  • Found that this unsuitable habitat maintains divergence between species.
  • Integrated findings with historical biogeography analyses.

Conclusions:

  • Ecological factors, specifically unsuitable habitat, play a significant role in maintaining biogeographic boundaries.
  • The studied Anolis lizard boundary originated from divergence on paleo-islands, reinforced by current ecological conditions.
  • This research provides a novel framework for studying the ecological underpinnings of biogeographic barriers.