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Thriving Hybrid Salamanders Contradict Common Wisdom

Date:
October 2, 2007
Source:
University of California, Davis
Summary:
A new study not only has important findings for the future of California tiger salamanders, but also contradicts prevailing scientific thought about what happens when animal species interbreed. They found that more of the hybrid young survived in the wild than did young of the native or the introduced species -- quite a surprise, since animal hybrids are usually less fit than their parents ("hybrid vigor" is largely limited to plant crosses).

Photo shows three types of salamander larvae: native California tiger salamanders (Ambystoma californiense), barred tiger salamanders (Ambystoma tigrinum mavortium), and the hybrid offspring born when the two species mated.
Credit: Bruce Delgado, U.S. Bureau of Land Management

A new UC Davis study not only has important findings for the future of California tiger salamanders, but also contradicts prevailing scientific thought about what happens when animal species interbreed.

The study, by former UC Davis doctoral student Benjamin Fitzpatrick (now on the faculty of University of Tennessee, Knoxville) and professor Bradley Shaffer, was published recently in the Proceedings of the National Academy of Sciences' online edition.

The salamander experts studied the survival rates and genetic makeup of three types of salamanders: native California tiger salamanders (Ambystoma californiense), which are protected under the U.S. Endangered Species Act; barred tiger salamanders that were introduced in California from Texas in the 1950s (Ambystoma tigrinum mavortium); and the hybrid offspring born when the two species mated.

They found that more of the hybrid young survived in the wild than did young of the native or the introduced species -- quite a surprise, since animal hybrids are usually less fit than their parents ("hybrid vigor" is largely limited to plant crosses).

That raises difficult questions for managing endangered native salamander populations, Shaffer said. Some conservationists might say that hybrids are an acceptable change, since they are favored by natural selection, and "improve" the original species. Others might consider hybrids to be genetically impure and regard them as threats to the native salamanders, their competitors and their prey.

Such questions will arise more frequently, Shaffer said, as humans both create new opportunities for hybridization with introduced species, and improve the genetic analyses that detect them.

The study, titled "Hybrid vigor between native and introduced salamanders raises new challenges for conservation," was funded by the U.S. Environmental Protection Agency (EPA), National Science Foundation (NSF), U.S. Department of Agriculture, CALFED Bay-Delta Program, and UC Davis Agricultural Experiment Station.


Story Source:

The above story is based on materials provided by University of California, Davis. Note: Materials may be edited for content and length.


Cite This Page:

University of California, Davis. "Thriving Hybrid Salamanders Contradict Common Wisdom." ScienceDaily. ScienceDaily, 2 October 2007. <www.sciencedaily.com/releases/2007/09/070926143355.htm>.
University of California, Davis. (2007, October 2). Thriving Hybrid Salamanders Contradict Common Wisdom. ScienceDaily. Retrieved July 23, 2014 from www.sciencedaily.com/releases/2007/09/070926143355.htm
University of California, Davis. "Thriving Hybrid Salamanders Contradict Common Wisdom." ScienceDaily. www.sciencedaily.com/releases/2007/09/070926143355.htm (accessed July 23, 2014).

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