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Population structure among octocoral adults and recruits identifies scale dependent patterns of population isolation in The Bahamas.

Lasker HR, Porto-Hannes I - PeerJ (2015)

Bottom Line: Analysis of recruits from 4 sites on the LBB from up to 6 years did not detect differences between years nor differences with adult populations.The result suggests that neither selection on recruits nor inter-annual variation in dispersal affected adult population structure.Recognition of these complex patterns is important in developing management plans for A. elisabethae and in understanding the effects of disturbance to adult populations of A. elisabethae and similar species with limited dispersal.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Geology, University at Buffalo , Buffalo, NY , USA ; Graduate Program in Evolution, Ecology and Behavior, University at Buffalo , Buffalo, NY , USA.

ABSTRACT
Patterns of dispersal and connectivity of the Caribbean gorgonian Antillogorgia elisabethae in The Bahamas were assessed in both adults and recently settled recruits from 13 sites using microsatellite loci. Adult populations along the Little Bahama Bank (LBB) exhibited a clear pattern of isolation by distance (IBD) which described 86% of the variance in pairwise genetic distances. Estimates of dispersal based on the IBD model suggested dispersal distances along the LBB on the order of 100 m. Increasing the spatial scale to include sites separated by open ocean generated an apparent IBD signal but the relationship had a greater slope and explained less of the variance. This relationship with distance reflected both stepping stone based IBD and regional differentiation probably created by ocean currents and barriers to dispersal that are correlated with geographic distance. Analysis of recruits from 4 sites on the LBB from up to 6 years did not detect differences between years nor differences with adult populations. The result suggests that neither selection on recruits nor inter-annual variation in dispersal affected adult population structure. Assignment tests of recruits indicated the most likely sources of the recruits were the local or adjacent populations. Most of the patterning in population structure in the northern Bahamas can be explained by geographic distance and oceanographic connectivity. Recognition of these complex patterns is important in developing management plans for A. elisabethae and in understanding the effects of disturbance to adult populations of A. elisabethae and similar species with limited dispersal.

No MeSH data available.


Related in: MedlinePlus

Mantel test of pairwise genetic distance and geographic distance.Relationship between pairwise genetic distance and geographic distance. (A) LBB are comparisons among sites on the Little Bahama Bank; LBB-EGG, comparisons between Little Bahama Bank sites with EGG; + GBB—San Salvador (PR), all other pairwise comparison. The regressions are for the entire data set and for pairwise comparisons among the Little Bahama Bank sites (LBB).
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fig-2: Mantel test of pairwise genetic distance and geographic distance.Relationship between pairwise genetic distance and geographic distance. (A) LBB are comparisons among sites on the Little Bahama Bank; LBB-EGG, comparisons between Little Bahama Bank sites with EGG; + GBB—San Salvador (PR), all other pairwise comparison. The regressions are for the entire data set and for pairwise comparisons among the Little Bahama Bank sites (LBB).

Mentions: The pattern of increasing genetic differentiation with geographic distance suggested by the FST values is evident in the Mantel tests (Fig. 2A). Plots of genetic distance versus geographic distance were significant (Fig. 2A, P = 0.01) and the results were very similar regardless of whether geographic distance or adjusted geographic distance was used (geographic distance, y = 0.0007x − 0.0208, R2 = 0.6775, P = 0.010; adjusted geographic distance, y = 0.0005x + 0.0008, R2 = 0.4857, P = 0.010). The proportion of variance explained by the relationship was greater using geographic distance and those data are presented. As evident in Fig. 2B pairwise comparisons among sites from the LBB as well as those comparing LBB sites with EGG form a clear linear pattern. If the regression for the LBB is recalculated including the comparisons with EGG, the slope of the line is unchanged and the regression explains 84% of the variation. The regression that included comparisons among the other sites (Fig. 2A) and of those sites to LBB sites also generated a significant regression, but inspection of the data suggests there are several subsets of comparisons, that do not appear to change with distance. The pairwise comparisons with FST/(1 − FST) values >0.15 are all comparisons of Exuma Sound (HC) and San Salvador (PR) with the other sites, and each of those sets of comparisons shows little change with distance and perhaps even an inverse relationship.


Population structure among octocoral adults and recruits identifies scale dependent patterns of population isolation in The Bahamas.

Lasker HR, Porto-Hannes I - PeerJ (2015)

Mantel test of pairwise genetic distance and geographic distance.Relationship between pairwise genetic distance and geographic distance. (A) LBB are comparisons among sites on the Little Bahama Bank; LBB-EGG, comparisons between Little Bahama Bank sites with EGG; + GBB—San Salvador (PR), all other pairwise comparison. The regressions are for the entire data set and for pairwise comparisons among the Little Bahama Bank sites (LBB).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4493681&req=5

fig-2: Mantel test of pairwise genetic distance and geographic distance.Relationship between pairwise genetic distance and geographic distance. (A) LBB are comparisons among sites on the Little Bahama Bank; LBB-EGG, comparisons between Little Bahama Bank sites with EGG; + GBB—San Salvador (PR), all other pairwise comparison. The regressions are for the entire data set and for pairwise comparisons among the Little Bahama Bank sites (LBB).
Mentions: The pattern of increasing genetic differentiation with geographic distance suggested by the FST values is evident in the Mantel tests (Fig. 2A). Plots of genetic distance versus geographic distance were significant (Fig. 2A, P = 0.01) and the results were very similar regardless of whether geographic distance or adjusted geographic distance was used (geographic distance, y = 0.0007x − 0.0208, R2 = 0.6775, P = 0.010; adjusted geographic distance, y = 0.0005x + 0.0008, R2 = 0.4857, P = 0.010). The proportion of variance explained by the relationship was greater using geographic distance and those data are presented. As evident in Fig. 2B pairwise comparisons among sites from the LBB as well as those comparing LBB sites with EGG form a clear linear pattern. If the regression for the LBB is recalculated including the comparisons with EGG, the slope of the line is unchanged and the regression explains 84% of the variation. The regression that included comparisons among the other sites (Fig. 2A) and of those sites to LBB sites also generated a significant regression, but inspection of the data suggests there are several subsets of comparisons, that do not appear to change with distance. The pairwise comparisons with FST/(1 − FST) values >0.15 are all comparisons of Exuma Sound (HC) and San Salvador (PR) with the other sites, and each of those sets of comparisons shows little change with distance and perhaps even an inverse relationship.

Bottom Line: Analysis of recruits from 4 sites on the LBB from up to 6 years did not detect differences between years nor differences with adult populations.The result suggests that neither selection on recruits nor inter-annual variation in dispersal affected adult population structure.Recognition of these complex patterns is important in developing management plans for A. elisabethae and in understanding the effects of disturbance to adult populations of A. elisabethae and similar species with limited dispersal.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Geology, University at Buffalo , Buffalo, NY , USA ; Graduate Program in Evolution, Ecology and Behavior, University at Buffalo , Buffalo, NY , USA.

ABSTRACT
Patterns of dispersal and connectivity of the Caribbean gorgonian Antillogorgia elisabethae in The Bahamas were assessed in both adults and recently settled recruits from 13 sites using microsatellite loci. Adult populations along the Little Bahama Bank (LBB) exhibited a clear pattern of isolation by distance (IBD) which described 86% of the variance in pairwise genetic distances. Estimates of dispersal based on the IBD model suggested dispersal distances along the LBB on the order of 100 m. Increasing the spatial scale to include sites separated by open ocean generated an apparent IBD signal but the relationship had a greater slope and explained less of the variance. This relationship with distance reflected both stepping stone based IBD and regional differentiation probably created by ocean currents and barriers to dispersal that are correlated with geographic distance. Analysis of recruits from 4 sites on the LBB from up to 6 years did not detect differences between years nor differences with adult populations. The result suggests that neither selection on recruits nor inter-annual variation in dispersal affected adult population structure. Assignment tests of recruits indicated the most likely sources of the recruits were the local or adjacent populations. Most of the patterning in population structure in the northern Bahamas can be explained by geographic distance and oceanographic connectivity. Recognition of these complex patterns is important in developing management plans for A. elisabethae and in understanding the effects of disturbance to adult populations of A. elisabethae and similar species with limited dispersal.

No MeSH data available.


Related in: MedlinePlus