Genetic structure and shell shape variation within a rocky shore whelk suggest both diverging and constraining selection with gene flow

Gemmell, Michael R.; Trewick, Steven A.; Crampton, James S.; Vaux, Felix; Hills, Simon F. K.; Daly, Elizabeth E.; Marshall, Bruce A.; Beu, Alan G.; Morgan‐Richards, Mary

doi:10.1093/biolinnean/bly142

Cited by 7 publications

(5 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the fossil record is often incomplete, the comparison of phylogeographic patterns among closely related species with a similar geographic distribution can be very useful to identify extrinsic barriers to gene flow impacting on both species or to disclose differences related to species-specific life history or ecological requisites [15][16][17][18][19]. For instance, closely related species with similar dispersal capacity and historical distribution range but showing distinct levels of genetic diversity when facing marginal habitat conditions can inform us about the ability of different taxa to resist environmental changes in different regions across their range [20][21][22][23]. This is fundamental to accurately predict the species responses to natural or human-mediated climate changes.…”

Section: Introductionmentioning

confidence: 99%

Phylogeographic history of flat periwinkles, Littorina fabalis and L. obtusata

et al. 2020

View full text Add to dashboard Cite

Background: The flat periwinkles, Littorina fabalis and L. obtusata, are two sister species widely distributed throughout the Northern Atlantic shores with high potential to inform us about the process of ecological speciation in the intertidal. However, whether gene flow has occurred during their divergence is still a matter of debate. A comprehensive assessment of the genetic diversity of these species is also lacking and their main glacial refugia and dispersal barriers remain largely unknown. In order to fill these gaps, we sequenced two mitochondrial genes and two nuclear fragments to perform a phylogeographic analysis of flat periwinkles across their distribution range. Results: We identified two main clades largely composed by species-specific haplotypes corresponding to L. obtusata and L. fabalis, with moderate to strong support, respectively. Importantly, a model of divergence with gene flow between the two species (from L. obtusata to L. fabalis) was better supported, both in Iberia and in northern-central Europe. Three mitochondrial clades were detected within L. fabalis and two within L. obtusata, with strong divergence between Iberia and the remaining populations. The largest component of the genetic variance within each species was explained by differences between geographic regions associated with these clades. Our data suggests that overall intraspecific genetic diversity is similar between the two flat periwinkle species and that populations from Iberia tend to be less diverse than populations from northern-central Europe.Conclusions: The phylogeographic analysis of this sister-species pair supports divergence with gene flow. This system thus provides us with the opportunity to study the contribution of gene flow and natural selection during diversification. The distribution of the different clades suggests the existence of glacial refugia in Iberia and northern-central Europe for both species, with a main phylogeographic break between these regions. Although the genetic diversity results are not fully conclusive, the lower diversity observed in Iberia could reflect marginal conditions at the southern limit of their distribution range during the current interglacial period.

show abstract

Section: Introductionmentioning

confidence: 99%

Phylogeographic history of flat periwinkles, Littorina fabalis and L. obtusata

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Directly establishing utility through hypothesis formation and experimentation (the “paradigm method” [Rudwick 2018]; e.g., Arnold 1983; Wainwright and Reilly 1994) may help determine whether the feature under investigation is indeed adaptive, exaptive, or nonaptive, and if it is adaptive, how selection may have acted to establish the feature (Wake 1991; Wake et al 2011). The ecological context can also help determine the function of a feature by identifying what environments selected for that feature (e.g., Harvey and Pagel 1991; Vermeij 2002; Gemmell et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Convergence, parallelism, and function of extreme parietal callus in diverse groups of Cenozoic Gastropoda

et al. 2020

View full text Add to dashboard Cite

We use scanning electron microscopy imaging to examine the shell microstructure of fossil and living species in five families of caenogastropods (Strombidae, Volutidae, Olividae, Pseudolividae, and Ancillariidae) to determine whether parallel or convergent evolution is responsible for the development of a unique caenogastropod trait, the extreme parietal callus (EPC). The EPC is defined as a substantial thickening of both the spire callus and the callus on the ventral shell surface such that it covers 50% or more of the surface. Caenogastropods as a whole construct the EPC convergently, using a variety of low-density, poorly organized microstructures that are otherwise uncommon in caenogastropod non-callus shell construction. Within clades, however, we see evidence for parallelism in decreased regulation in both the shell and callus microstructure. Low-density and poorly ordered microstructure—such as used for the EPC—uses less organic scaffolding and is less energetically expensive than normal shell microstructure. This suggests the EPC functions to rapidly and inexpensively increase shell thickness and overall body size. Tests of functional ecology suggest that the EPC might function both to defend against crushing predation through increased body size and dissipation of forces while aiding in shell orientation of highly mobile gastropods. These interpretations hinge on the current phylogenetic placement of caenogastropod families, emphasizing the essential contribution of phylogeny when interpreting homoplasy.

show abstract

“…The low gene flow can lead to low combinations of two or more gene pools so that populations become more isolated. This has implications for the high genetic diversity among the populations because the genetic exchange between populations was low (Bolnick and Nosil, 2007;Gemmell et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

Genetic Diversity of Alpinia Malaccensis (BURM.F.) Roscoe (Zingiberaceae) in Java Island, Indonesia

Setiawan¹,

ARDIYANI²,

MIFTAHUDIN³

et al. 2022

SABRAOJBG

View full text Add to dashboard Cite

Alpinia malaccensis (Burm.f.) Roscoe is a rare plant in Java, Indonesia, that produces essential oils. Its sustained decline causes great concern for future uses. Therefore, the study of its diversity in its natural habitat to predict future survival needs serious focus. The present study aims to determine the genetic diversity of A. malaccensis in Java based on ISSR markers. The sampling of a total of 11 populations yielded 33 accessions, which underwent amplifying using 12 ISSR primers. Using the molecular data analyzed their relationships, population structure, and genetic diversity. The UPGMA cluster, structure, and principal component analysis (PCA) demonstrated that the accessions divide in three groups, a result that correlates with their geography in Java. Group I consisted of var. malaccensis populations, while groups II and III comprised the var. nobilis populations, which proved truer among populations of var. nobilis. The genetic diversity category of A. malaccensis showed moderate based on Nei's genetic diversity (h = 0.2892) and Shannon's information index (I = 0.4438). The coefficient of genetic differentiation (GST) and molecular variance among the populations displayed higher within the individual population, which revealed a significant genetic variance among the 11 populations of A. malaccensis. The latest results confirm that ISSR markers can help distinguish the genotypes of A. malaccensis.

show abstract

Genetic structure and shell shape variation within a rocky shore whelk suggest both diverging and constraining selection with gene flow

Cited by 7 publications

References 72 publications

Phylogeographic history of flat periwinkles, Littorina fabalis and L. obtusata

Phylogeographic history of flat periwinkles, Littorina fabalis and L. obtusata

Convergence, parallelism, and function of extreme parietal callus in diverse groups of Cenozoic Gastropoda

Genetic Diversity of Alpinia Malaccensis (BURM.F.) Roscoe (Zingiberaceae) in Java Island, Indonesia

Contact Info

Product

Resources

About