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Generation of Chimeric Axolotls with Mutant Haploid Limbs Through Embryonic Grafting

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Ecological radiation with limited morphological diversification in salamanders.

Thomas Blankers¹, D C Adams, J J Wiens

¹Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Amsterdam, The Netherlands. thomasblankers@gmail.com

Journal of Evolutionary Biology

|January 25, 2012

Summary

Morphological diversity in plethodontid salamanders is not strongly linked to microhabitat use across most species. While some clades show associations, many salamander species exhibit decoupled ecological radiation and morphological evolution.

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Area of Science:

Evolutionary biology
Comparative anatomy
Ecology

Background:

Morphological diversity is a key question in evolutionary biology.
Adaptation to microhabitats is a proposed driver of this diversity.
Plethodontid salamanders exhibit significant morphological and microhabitat diversity.

Purpose of the Study:

To investigate the relationship between morphology and microhabitat use in plethodontid salamanders.
To determine if ecological radiation is coupled with morphological evolution in this salamander family.
To compare findings with other vertebrate groups, such as lizards.

Main Methods:

Phylogenetic comparative methods were employed.
Microhabitat data were collected for 189 plethodontid species.
Morphometric and phylogenetic data were analyzed for associations with ecological categories.

Main Results:

Associations between morphology and microhabitat were largely restricted to the Bolitoglossinae subfamily.
Morphological variation in most other plethodontid clades was not related to microhabitat categories.
Ecological radiation and morphological evolution were found to be decoupled in a significant portion of the studied clade.

Conclusions:

Ecological adaptation is not the primary driver of morphological diversity across all plethodontid salamanders.
Morphological evolution and ecological radiation can operate independently within major vertebrate clades.
Findings contrast with typical patterns observed in lizards, highlighting diverse evolutionary pathways.