Post on 15-Jan-2017
Population genomics reveals multiple drivers of population differentiation in a sex-role-
reversed pipefishSarah P. Flanagan, Emily Rose, Adam G. Jones
Texas A&M UniversityEvolution 2016
@sarahpf19spflanagan.phd@gmail.com
Differences between populations: why do we care?
Variation is the substrate of evolution
What causes population differentiation?
Neutral processes: genetic drift
Natural selection: local adaptation
Geographic variation in selection
F Jones et al. (2012), Nature Mobley & AG Jones(2012), Mol Ecol
What are the relative contributions of these processes?
How do we detect these processes?
Morphology and measurable traits Genomic patterns
Hohenlohe et al. (2010), Int J Plant SciFlanagan et al. (2014), JEB
Questions of Interest
• What is the relative importance of each process?
• Do morphological patterns of differentiation match genetic patterns?
Syngnathus scovelli
Syngnathus scovelli
Flanagan et al. (2014), JEB
Syngnathus scovelli
• Expected low dispersal • Natural selection favoring
crypsis• Strong sexual selection
Collecting
Chapter 1
The approach
ddRAD-sequencing Morphological Characteristics
Analzying RAD-seq Data
• Assembled reads into clusters and identified SNPs
• Created two sets of SNPS:– Pruned (1753)– All filtered SNPs (6348)
Catchen et al. (2011, 2013)
Mantel test: p = 0.02
Neutral Population Structure
Local Adaptation Outlier Loci
H ACA ribonucleoprotein complex non-core subunit NAF1
Phenotypic differentiation
Conclusions• Neutral processes primarily drive genetic
differentiation– Although there is some evidence for local
adaptation• Phenotypic differentiation follows a different
pattern than genetic differentiation
Acknowledgements
– Adam Jones– Emily Rose– Andrew Anderson– Kim Paczolt– Clay Small– Charlyn Partridge– Nicole Ortega– Heather Masonjones– Sawyer Masonjones– David Mahlmann– Emily Kasl– Melissa Giresi– Kevin Records– Alex Saucedo– William Cresko
Migration rates
Bayenv Regions Associated with Environmental Variables GO categories