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Evaluation of rockfish conservation area networks in the United States and Canada relative to the dispersal distance for black rockfish (Sebastes melanops).

Lotterhos KE, Dick SJ, Haggarty DR - Evol Appl (2013)

Bottom Line: We used isolation-by-distance theory to estimate the scale of dispersal from microsatellite data in the black rockfish, Sebastes melanops, and compared this estimate with the distance between RCAs that would protect this species.Within each country, we found that the distance between RCAs was generally within the confidence intervals of mean dispersal per generation.The distance between these two RCA networks, however, was greater than the average dispersal per generation.

View Article: PubMed Central - PubMed

Affiliation: Department of Zoology, University of British Columbia Vancouver, BC, Canada.

ABSTRACT
Marine reserves networks are implemented as a way to mitigate the impact of fishing on marine ecosystems. Theory suggests that a reserve network will function synergistically when connected by dispersal, but the scale of dispersal is often unknown. On the Pacific coast of the United States and Canada, both countries have recently implemented a number of rockfish conservation areas (RCAs) to protect exploited rockfish species, but no study has evaluated the connectivity within networks in each country or between the two countries. We used isolation-by-distance theory to estimate the scale of dispersal from microsatellite data in the black rockfish, Sebastes melanops, and compared this estimate with the distance between RCAs that would protect this species. Within each country, we found that the distance between RCAs was generally within the confidence intervals of mean dispersal per generation. The distance between these two RCA networks, however, was greater than the average dispersal per generation. The data were also consistent with a genetic break between southern Oregon and central Oregon. We discuss whether additional nearshore RCAs in southern Oregon and Washington would help promote connectivity between RCA's for shallow-water rockfishes.

No MeSH data available.


Genetic distance as a function of geographic distance for all sampled sites.
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fig03: Genetic distance as a function of geographic distance for all sampled sites.

Mentions: Across all sampled populations, we observed a significant correlation between geographic distance and genetic distance (Mantel test r = 0.57, P = 0.005) and a significant IBD slope RMA slope = 1.25*10−5 with 95% CI in (7.35*10−6, 2.15*10−5), (Fig. 3). To determine whether the population was at or near equilibrium, we (i) examined the IBD slope on smaller spatial scales and (ii) analyzed correlations between latitude and allelic richness and latitude and He. We found positive IBD slopes at each end of the range, with a slightly higher slope in the south [samples 1–5: Mantel correlation = 0.73, Mantel P = 0.02, RMA slope = 2.41*10−5, 95% CI in (1.09*10−5 6.34*10−5)] than in the north [samples 5–9: Mantel correlation = 0.44, Mantel P = 0.086, RMA slope = 1.18*10−5, 95% CI in (5.38*10−6, 2.09*10−5)]. Likewise, there was no significant correlation between latitude and He (Pearson's ρ = 0.09, P = 0.82), and a positive but nonsignificant relationship between latitude and allelic richness (Pearson's ρ = 0.59, P = 0.09). These data suggest that the population is at or near equilibrium and that IBD theory can be used to estimate the scale of dispersal.


Evaluation of rockfish conservation area networks in the United States and Canada relative to the dispersal distance for black rockfish (Sebastes melanops).

Lotterhos KE, Dick SJ, Haggarty DR - Evol Appl (2013)

Genetic distance as a function of geographic distance for all sampled sites.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3927886&req=5

fig03: Genetic distance as a function of geographic distance for all sampled sites.
Mentions: Across all sampled populations, we observed a significant correlation between geographic distance and genetic distance (Mantel test r = 0.57, P = 0.005) and a significant IBD slope RMA slope = 1.25*10−5 with 95% CI in (7.35*10−6, 2.15*10−5), (Fig. 3). To determine whether the population was at or near equilibrium, we (i) examined the IBD slope on smaller spatial scales and (ii) analyzed correlations between latitude and allelic richness and latitude and He. We found positive IBD slopes at each end of the range, with a slightly higher slope in the south [samples 1–5: Mantel correlation = 0.73, Mantel P = 0.02, RMA slope = 2.41*10−5, 95% CI in (1.09*10−5 6.34*10−5)] than in the north [samples 5–9: Mantel correlation = 0.44, Mantel P = 0.086, RMA slope = 1.18*10−5, 95% CI in (5.38*10−6, 2.09*10−5)]. Likewise, there was no significant correlation between latitude and He (Pearson's ρ = 0.09, P = 0.82), and a positive but nonsignificant relationship between latitude and allelic richness (Pearson's ρ = 0.59, P = 0.09). These data suggest that the population is at or near equilibrium and that IBD theory can be used to estimate the scale of dispersal.

Bottom Line: We used isolation-by-distance theory to estimate the scale of dispersal from microsatellite data in the black rockfish, Sebastes melanops, and compared this estimate with the distance between RCAs that would protect this species.Within each country, we found that the distance between RCAs was generally within the confidence intervals of mean dispersal per generation.The distance between these two RCA networks, however, was greater than the average dispersal per generation.

View Article: PubMed Central - PubMed

Affiliation: Department of Zoology, University of British Columbia Vancouver, BC, Canada.

ABSTRACT
Marine reserves networks are implemented as a way to mitigate the impact of fishing on marine ecosystems. Theory suggests that a reserve network will function synergistically when connected by dispersal, but the scale of dispersal is often unknown. On the Pacific coast of the United States and Canada, both countries have recently implemented a number of rockfish conservation areas (RCAs) to protect exploited rockfish species, but no study has evaluated the connectivity within networks in each country or between the two countries. We used isolation-by-distance theory to estimate the scale of dispersal from microsatellite data in the black rockfish, Sebastes melanops, and compared this estimate with the distance between RCAs that would protect this species. Within each country, we found that the distance between RCAs was generally within the confidence intervals of mean dispersal per generation. The distance between these two RCA networks, however, was greater than the average dispersal per generation. The data were also consistent with a genetic break between southern Oregon and central Oregon. We discuss whether additional nearshore RCAs in southern Oregon and Washington would help promote connectivity between RCA's for shallow-water rockfishes.

No MeSH data available.