LOGIN

RSS Facebook Twitter YouTube
GLOSSARY       

SEARCHGLOSSARY

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

PROFILESEARCH

Avatar

Please consider registering
guest

sp_LogInOut Log In sp_Registration Register

Register | Lost password?
Advanced Search

— Forum Scope —




— Match —





— Forum Options —





 

Minimum search word length is 4 characters - maximum search word length is 84 characters

sp_Feed Topic RSS sp_TopicIcon
Dramatic Shifts In The Gene Pool Of A Managed Population Of An Endangered Species May Be Exacerbated By High Genetic Load
November 28, 2011
8:37 am
Avatar
Matt
Málaga, Spain
Admin
Forum Posts: 8239
Member Since:
June 13, 2011
sp_UserOfflineSmall Offline

Abstract

The Devils Hole pupfish, Cyprinodon diabolis, is restricted to a small habitat in southwestern Nevada. In 1972 the species was federally listed as an endangered species. Management efforts to mitigate extinction risks have been plagued by the inability to propagate the species in aquaria—anomalous for the genus—and repeated failure of propagation attempts in large, outdoor, artificial pools designed to mimic natural conditions in Devils Hole. These difficulties indicate that the species either has niche requirements that are not adequately recreated under artificial conditions or that it harbors a relatively large genetic load of deleterious mutations that compromises propagation. We used variation at 12 microsatellite loci to evaluate the results of natural, uncontrolled hybridization involving a population of C. diabolis inhabiting an artificial pool and invaders from a nearby population of the closely related C. nevadensis. The results suggest that following invasion of the pool by three C. nevadensis individuals, the gene pool underwent a rapid shift from pure C. diabolis to one comprised mostly of C. nevadensis alleles. Alleles diagnostic for C. nevadensis increased from about 0.03 to an average of 0.76 across four diagnostic loci over the course of 8 years or less. Although we cannot exclude explanations based on adaptation to Devils Hole, genetic drift, or demographic variability, these results and various other aspects of the biology of C. diabolis are best explained by the genetic load hypothesis. The work suggest avenues for future experimental work to evaluate these possibilities directly and provide an explanation for why some previous propagation efforts designed to mitigate extinction risk have failed.

Cake or death?
Forum Timezone: Europe/Paris

Most Users Ever Online: 246

Currently Online:
1 Guest(s)

Currently Browsing this Page:
1 Guest(s)

Devices in use: Desktop (1)

Top Posters:

Stefan: 1567

Plaamoo: 1253

mikev: 1134

Malti: 1099

Mark Duffill: 1012

Member Stats:

Guest Posters: 0

Members: 30289

Moderators: 0

Admins: 2

Forum Stats:

Groups: 4

Forums: 10

Topics: 4595

Posts: 36615

Newest Members: adennett, Brawny, qchris87, grayergroove, bhisma wildan

Administrators: dunc: 1323, Matt: 8239