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
High levels of interspecific gene flow in an endemic cichlid fish adaptive radiation from an extreme lake environment
May 22, 2015
10:47 am
Avatar
Matt
Málaga, Spain
Admin
Forum Posts: 8239
Member Since:
June 13, 2011
sp_UserOfflineSmall Offline

Molecular Ecology - accepted article

Abstract

Studying recent adaptive radiations in isolated insular systems avoids complicating causal events and thus may offer clearer insight into mechanisms generating biological diversity. Here we investigate evolutionary relationships and genomic differentiation within the recent radiation of Alcolapia cichlid fish that exhibit extensive phenotypic diversification, and which are confined to the extreme soda lakes Magadi and Natron in East Africa. We generated an extensive RAD dataset of 96 individuals across multiple sampling sites and find evidence for genetic admixture between species within Lake Natron, with the highest levels of admixture between sympatric populations of the most recently diverged species. Despite considerable environmental separation, populations within Lake Natron do not exhibit isolation by distance, indicating panmixia within the lake, although individuals within lineages clustered by population in phylogenomic analysis. Our results indicate exceptionally low genetic differentiation across the radiation despite considerable phenotypic trophic variation, supporting previous findings from smaller datasets, however with the increased power of densely sampled SNPs we identify genomic peaks of differentiation (FST outliers) between Alcolapia species. While evidence of ongoing gene flow and interspecies hybridisation in certain populations suggests that Alcolapia species are incompletely reproductively isolated, the identification of outlier SNPs under diversifying selection indicates the radiation is undergoing adaptive divergence.

Cake or death?
Forum Timezone: Europe/Paris

Most Users Ever Online: 246

Currently Online: hachge
1 Guest(s)

Currently Browsing this Page:
1 Guest(s)

Devices in use: Desktop (2)

Top Posters:

Stefan: 1567

Plaamoo: 1253

mikev: 1134

Malti: 1099

Mark Duffill: 1012

Member Stats:

Guest Posters: 0

Members: 30292

Moderators: 0

Admins: 2

Forum Stats:

Groups: 4

Forums: 10

Topics: 4596

Posts: 36616

Newest Members: fitzkneemd, mike76, Harvey, adennett, Brawny

Administrators: dunc: 1323, Matt: 8239