Field evidence for an association between growth and protein polymorphism in the acorn barnacle Semibalanus balanoides

Véliz, David; Bourget, Edwin; Bernatchez, Louis

doi:10.3354/meps308197

Cited by 4 publications

(7 citation statements)

References 47 publications

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“…These results support those of Véliz et al (2006a), who suggested a 2-stage selection process consisting of genotype-specific mortality shortly after settlement, followed by a genotype-specific growth association in later life. Opercular width is a classic measurement of barnacle size; however, cirral length is expected to be an important fitness trait due to its relationship with resource acquisition in filter feeding.…”

Section: Genetic Effectssupporting

confidence: 81%

“…Opercular width is a classic measurement of barnacle size; however, cirral length is expected to be an important fitness trait due to its relationship with resource acquisition in filter feeding. Previous links between size and genotype have been documented at both the Mpi and Gpi loci (Schmidt 2001, Véliz et al 2006a. In the present study, Mpi-SS homozygotes represented the largest class of individuals among fieldcollected barnacles in the first 2 mo after settlement.…”

Section: Genetic Effectsmentioning

confidence: 56%

“…It may be that genotype frequency shifts are the result of latent effects tied to the carbohydrate composition and productivity of the planktonic community north and south of the estuary, but this remains speculative (Véliz et al 2004). Out of these 2 loci, the locus primarily correlated with barnacle size also varies with location, as Gpi covaries with size phenotypes in New Brunswick, but Mpi covaries with size in Maine (Schmidt 2001, Véliz et al 2006a). …”

Section: Introductionmentioning

confidence: 99%

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Physiological stress and the fitness effects of Mpi genotypes in the acorn barnacle Semibalanus balanoides

Flight

Schoepfer²,

Rand³

2010

Mar. Ecol. Prog. Ser.

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Balancing selection has been invoked to explain the apparent maintenance of polymorphisms at the mannose-6-phosphate isomerase (Mpi) and glucose-6-phosphate isomerase (Gpi) loci in a diverse array of organisms. However, in many cases the agents of selective stress and the grain size of environmental heterogeneity necessary to preserve genetic variation remain uncertain. In the barnacle Semibalanus balanoides, differing selection regimes have been proposed across the species' range. To test whether or not fitness differences segregate with Mpi and Gpi polymorphisms near the southern range limit, barnacles from Narragansett Bay, Rhode Island, were subjected to physiological challenges in the laboratory. Survivorship was measured in barnacles exposed to an orthogonal combination of salinity, thermal and dietary stresses. Cirral length and genotype frequency shifts at Mpi and Gpi were assessed in low salinity treatments. Mortality from thermal stress was greatly enhanced under low salinity. Across all low salinity treatments there was a nonsignificant trend of decreased fitness associated with the Mpi-SS genotype. Cirral length variation was significantly correlated with Mpi genotypes in a pattern consistent with survivorship data.

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Section: Genetic Effectssupporting

confidence: 81%

Section: Genetic Effectsmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 99%

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Physiological stress and the fitness effects of Mpi genotypes in the acorn barnacle Semibalanus balanoides

Flight

Schoepfer²,

Rand³

2010

Mar. Ecol. Prog. Ser.

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“…First, mating among acorn barnacles can only take place when one individual is within penile distance from other potential mates (Anderson 1994). Moreover, the acorn barnacle is a highly fecund hermaphrodite, each adult producing up to 5000 larvae (Véliz et al . 2006a).…”

Section: Discussionmentioning

confidence: 99%

Genetic evidence for kin aggregation in the intertidal acorn barnacle (Semibalanus balanoides)

et al. 2006

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It is generally assumed that larvae of benthic species are thoroughly mixed in the plankton and distributed randomly at settlement. Yet, it has also been hypothesized that a combination of larval gregarious behaviour coupled with particular oceanographic conditions may prevent larvae from mixing completely, and result in nonrandom spatial distributions following settlement. Using microsatellite markers, the main objective of this study was to investigate the occurrence of statistical connections between relatedness and settlement in the intertidal acorn barnacle from the Gulf of St Lawrence, Canada. A second objective was to test the hypothesis that patches of kin-related individuals came from a common parental site. Our results indicated that a significant number of barnacles within a given sample were more closely related than expected by chance despite the enormous potential for admixture during the planktonic phase. Thus, eight out of 37 samples analysed had relatedness values significantly higher than expected from random settlement. Moreover, analyses of sibship network construction and network complexity tests provided evidence for the occurrence of networks within several samples that were characterized by strong connections among individuals. Thus, nonrandom planktonic dispersal associated with relatively stable oceanic currents, as well as additional ecological factors to be rigorously investigated (e.g. behavioural mechanisms), may be more important in determining patterns of genetic structure in marine benthic invertebrates than generally assumed. Therefore, documenting genetic patterns associated with kin aggregation should be a fruitful and an important avenue for future studies in marine invertebrates.

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“…The differential fitness of MPI genotypes was only realized when barnacles were exposed to both dietary mannose and temperature/desiccation stress, and patterns of survivorship were associated with functional differences between MPI genotypes (Schmidt 2001; Rand et al . 2002; but see Veliz et al . 2006).…”

Section: Discussionmentioning

confidence: 99%

Genetic heterogeneity among intertidal habitats in the flat periwinkle, Littorina obtusata

Schmidt

Phifer‐Rixey

Taylor³

et al. 2007

Molecular Ecology

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Comparisons among patterns exhibited by functionally distinct genetic markers have been widely used to infer the impacts of demography and selection in structuring genetic variation in natural populations. However, such multilocus comparisons remain an indirect evaluation of selection at particular candidate loci; ideally, the identification of a candidate gene by comparative genetic methodologies should be complemented by functional analyses and experimental manipulations of genotypes in the laboratory or field. We examined genotype frequency variation among replicated intertidal habitats at two spatial scales in the grazing snail Littorina obtusata. Both of the candidate allozyme markers varied predictably with environment, and these patterns were consistent at both spatial scales. Three of four reference loci were spatially homogeneous, but one microsatellite exhibited significant structure at both geographical and mesoscales. To initiate a direct examination of whether the observed genotype frequency variation at one of the candidate markers, mannose-6-phosphate isomerase (MPI), was impacted by differential survivorship of genotypes, we conducted a series of laboratory-based thermal stress assays using snails from two geographically disparate source populations. When snails were exposed to bouts of thermal/desiccation stress, patterns of mortality were nonrandom with respect to MPI genotype. Furthermore, patterns of mortality in the laboratory manipulation coincided with the observed distribution of genotypes in the field. The data suggest the operation of selection at the Mpi or a linked locus, but functional studies and further experimentation are required to establish the relationship between MPI genotype and fitness across heterogeneous intertidal environments.

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Field evidence for an association between growth and protein polymorphism in the acorn barnacle Semibalanus balanoides

Cited by 4 publications

References 47 publications

Physiological stress and the fitness effects of Mpi genotypes in the acorn barnacle Semibalanus balanoides

Physiological stress and the fitness effects of Mpi genotypes in the acorn barnacle Semibalanus balanoides

Genetic evidence for kin aggregation in the intertidal acorn barnacle (Semibalanus balanoides)

Genetic heterogeneity among intertidal habitats in the flat periwinkle, Littorina obtusata

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