Genetic Clines in the Bay of Biscay Provide Estimates of Migration for Sardina pilchardus

Laurent, Véronique; Voisin, Marie; Planes, Serge

doi:10.1093/jhered/esj005

Cited by 11 publications

(6 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This result certainly confirms the hypothesis of a single genetic stock of sardine in the Bay of Biscay, as already proposed for hake (Lundy et al ., 2000), mackerel (Nesbo et al ., 2000), and blue whiting (Giaever & Stien, 1998) in the same area. The only exception to this general pattern in S. pilchardus is a cline identified from the 2002 sampling with an overall significant relationship between allelic frequencies in PGM‐1 * locus and longitude (Laurent, Voisin & Planes, 2006). Samples from 2001 and 2003 did not exhibit a similar cline for these years.…”

Section: Resultsmentioning

confidence: 91%

Effective population size estimation on Sardina pilchardus in the Bay of Biscay using a temporal genetic approach

Laurent

Planes

2007

Biological Journal of the Linnean Society

Self Cite

View full text Add to dashboard Cite

Over three consecutive years, we surveyed the temporal variability in genetic structure of sardine populations in the Bay of Biscay and effective population size. Based on individual age, the genetic structure of year classes of the fishes was also surveyed, showing that populations of sardines have weak but significant genetic differences between sampling years and between year classes. We used two different methods to assess effective population size. The methods resulted in different values but a similar range, indicating a low effective population for Sardina pilchardus . Effective population size decreased over the 3 years, probably resulting from an abundance of fish in the Bay. Based on these results, we conclude that temporal variability in the genetic structure of the sardine population and effective size are likely related to environmental conditions in the Bay. Finally, we propose to use effective population size to estimate biomass of sardines in the Bay.

show abstract

Section: Resultsmentioning

confidence: 91%

Effective population size estimation on Sardina pilchardus in the Bay of Biscay using a temporal genetic approach

Laurent

Planes

2007

Biological Journal of the Linnean Society

Self Cite

View full text Add to dashboard Cite

show abstract

“…An alternative approach is to assume a reasonable range of selection differentials to derive a range of likely dispersal distances. Such use of selected markers for the estimation of gene flow is commonplace in the hybrid zone literature (Barton and Hewitt 1985), and has been recently extended to intraspecific genetic clines expected from selected markers (Laurent et al. 2006; Sotka and Palumbi 2006).…”

Section: Spatial and Temporal Scale Of Adaptationmentioning

confidence: 99%

Paradigm shifts in marine fisheries genetics: ugly hypotheses slain by beautiful facts

2008

View full text Add to dashboard Cite

Introduction 334Population structure in marine fishes 335 Paradigm shift 335Genetic differentiation in space and time 336Population connectivity in marine fishes on a fine scale 338Spatial and temporal scale of adaptation 339 Paradigm shifts 339Spatial scale of adaptive differentiation 340Temporal scale of adaptive differentiation 342 AbstractBy providing new approaches to the investigation of demographic and evolutionary dynamics of wild populations, molecular genetics has led to fundamental changes in our understanding of marine ecology. In particular, genetic approaches have revolutionized our understanding in three areas: (i) most importantly, they have contributed to the discovery of extensive genetic population structure in many marine species, overturning the notion of large, essentially homogenous marine populations limiting local adaptation and speciation. (ii) Concomitant differences in ecologically important traits now indicate extensive adaptive differentiation and biocomplexity, potentially increasing the resilience to exploitation and disturbance. Evidence for rapid adaptive change in many populations underlies recent concerns about fisheries-induced evolution affecting life-history traits. (iii) A compilation of recent published research shows estimated effective population sizes that are 2-6 orders of magnitude smaller than census sizes, suggesting more complex recruitment dynamics in marine species than previously assumed. Studies on Atlantic cod are used to illustrate these paradigm shifts. In our synthesis, we emphasize the implications of these discoveries for marine ecology and evolution as well as the management and conservation of exploited marine fish populations. An important implication of genetic structuring and the potential for adaptive divergence is that locally adapted populations are unlikely to be replaced through immigration, with potentially detrimental consequences for the resilience to environmental changea key consideration for sustainable fisheries management.

show abstract

“…These results suggested different selective pressures on flounder depending on the habitat they colonised. As for sole, sardine (Sardinus pilchardus) is considered a panmictic stock in the Bay of Biscay (Laurent et al 2006). However, authors demonstrated clinal patterns of genetic variation at some allozymic loci that correlated with physical features such as the distance to the coast or longitude, and with biological features such as age and length of the individuals.…”

Section: Introductionmentioning

confidence: 99%

Genetic structure of the common sole (Solea solea) in the Bay of Biscay: Nurseries as units of selection?

Guinand

Rolland

Bonhomme

2008

Estuarine, Coastal and Shelf Science

View full text Add to dashboard Cite

Coastal and estuarine areas in the Bay of Biscay are essential nursery habitats for sole (Solea solea). Using three intronic markers, we investigated patterns of genetic differentiation among cohorts of juveniles (0+, 1+, sub-adults) inhabiting four major nurseries in the Vilaine and Loire river estuaries, the Pertuis d'Antioche strait, and the Gironde estuary. Genetic differentiation was not significant for the age 0-and 1-groups, but was among sub-adult samples (θWC = 0.017; P = 0.031). Hierarchical analyses of genotypic frequencies by nested multivariate ANOVA using redundancy analysis indicated that northern nurseries of Loire and Vilaine rivers had different patterns of genotypic variation with age than southern nurseries of the Pertuis d'Antioche and Gironde estuaries (F = 1.36; P = 0.007). Bay of Biscay nurseries appeared to be spatially structured between a southern and a northern group that exhibit different genotypic distributions. Genetic drift and gene flow explains this pattern poorly, but a statistical test (P < 0.035) suggested that the metallothionein (MT) locus may be significantly impacted by selection in southern estuaries. As metallothionein is involved in heavy-metal detoxification, and southern nurseries are known to be affected by cadmium, this indicates a possible correlation between observed genotypic distributions and some nursery habitat features in sole. Some selective patterns might also be proposed to explain patterns of linkage disequilibrium observed at amylase loci in three of the four nurseries.

show abstract

Genetic Clines in the Bay of Biscay Provide Estimates of Migration for Sardina pilchardus

Cited by 11 publications

References 51 publications

Effective population size estimation on Sardina pilchardus in the Bay of Biscay using a temporal genetic approach

Effective population size estimation on Sardina pilchardus in the Bay of Biscay using a temporal genetic approach

Paradigm shifts in marine fisheries genetics: ugly hypotheses slain by beautiful facts

Genetic structure of the common sole (Solea solea) in the Bay of Biscay: Nurseries as units of selection?

Contact Info

Product

Resources

About