Navigation Links
Thriving hybrid salamanders contradict common wisdom

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.


Contact: Brad Shaffer
University of California - Davis

Page: 1

Related biology news :

1. Hybrid grass may prove to be valuable fuel source
2. Agilent Technologies Introduces First Commercial Mouse Microarray for Comparative Genomic Hybridization Research
3. Divergent mating systems and parental conflict as a barrier to hybridization in flowering plants
4. New hybrid virus provides targeted molecular imaging of cancer
5. Ring-like formations in drying DNA drops could affect hybridization studies
6. Study provides new understanding of spontaneous hybridization
7. Geneticists discover genes that make fruit fly hybrids sterile
8. Hybrid molecule causes cancer cells to self-destruct
9. Elusive salamanders have role in developing new sampling models
10. Salamanders suffer delayed effects of common herbicide
11. Its not all genetic: Common epigenetic problem doubles cancer risk in mice
Post Your Comments:
(Date:5/12/2016)... -- , a brand of Troubadour Research ... the Q1 wave of its quarterly wearables survey. A ... to a program where they would receive discounts for ... "We were surprised to see that so ... , CEO of Troubadour Research, "primarily because there are ...
(Date:5/3/2016)... , May 3, 2016  Neurotechnology, a ... the MegaMatcher Automated Biometric Identification System (ABIS) ... large-scale multi-biometric projects. MegaMatcher ABIS can process multiple ... using any combination of fingerprint, face or iris ... MegaMatcher SDK and MegaMatcher Accelerator , ...
(Date:4/28/2016)... First quarter 2016:   , Revenues amounted ... quarter of 2015 The gross margin was 49% (27) ... the operating margin was 40% (-13) Earnings per share ... operations was SEK 249.9 M (21.2) , Outlook   ... M. The operating margin for 2016 is estimated to ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... , June 23, 2016 Apellis ... Phase 1 clinical trials of its complement C3 ... single and multiple ascending dose studies designed to ... (PD) of subcutaneous injection in healthy adult volunteers. ... (SC) either as a single dose (ranging from ...
(Date:6/23/2016)... 23, 2016 Andrew ... Published recently in ... journal from touchONCOLOGY, Andrew D Zelenetz , ... cancer care is placing an increasing burden on ... biologic therapies. With the patents on many biologics ...
(Date:6/23/2016)... San Francisco, CA (PRWEB) , ... June 23, ... ... capture (EDC) software, is exhibiting at the Pennsylvania Convention Center and will showcase ... DIA Annual conference. ClinCapture will also be presenting a scientific poster on Disrupting ...
(Date:6/23/2016)... Connecticut (PRWEB) , ... June 23, 2016 , ... ... introduce a new line of intelligent tools designed, tuned and optimized exclusively for ... September 12–17 in Chicago. The result of a collaboration among several companies with ...
Breaking Biology Technology: