Introgression in two species of broadcast spawning marine invertebrate

Nydam, Marie L.; Yanckello, Lucille M.; Bialik, Sarah B.; Giesbrecht, Kirsten B.; Nation, Grant K.; Peak, Jessica L.

doi:10.1093/biolinnean/blw012

Cited by 14 publications

(8 citation statements)

References 67 publications

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“…Similar introgression patterns have been also reported for other congeneric marine gastropods in places where they occur in sympatry (Costa et al, 2020; Galindo et al, 2021; Hirase et al, 2021). Scurria , like most Patellogastropoda (Kolbin & Kulikova, 2011) are broadcast spawners and as such, the number and diversity of possible reproductive barriers might be limited compared with other organisms with different reproductive strategies (Nydam et al, 2017). Further studies that include laboratory crosses, genetic field surveys with higher sampling effort, and experiments to measure the performance of hybrids are needed to test these hypotheses.…”

Section: Discussionmentioning

confidence: 99%

Population genomic analyses reveal hybridization and marked differences in genetic structure of Scurria limpet sister species with parapatric distributions across the South Eastern Pacific

Saenz‐Agudelo

Peluso

Nespolo

et al. 2022

Ecology and Evolution

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The study of sister species that occur in parapatry around biogeographic transition zones can help understand the evolutionary processes that underlie the changes in species composition across biogeographic transition zones. The South Eastern Pacific (SEP) coast is a highly productive coastal system that exhibits a broad biogeographic transition zone around 30–35°S. Here, we present a comparative genome‐wide analysis of the sister species Scurria viridula and Scurria zebrina, that occur in parapatry and whose poleward and equatorward range edges intersect in the 30–35°S SEP biogeographic transition zone. We sampled 118 specimens sourced from nine sites from Tocopilla (22°S) to Chiloé (41°S) including one site where both species overlap and analyzed over 8000 biallelic single nucleotide polymorphisms. We found evidence of hybridization between these species in the contact zone and found significant but contrasting population structures for both species. Our results indicate that the genetic structure in S. viridula, which is currently expanding its range poleward, follows a simple isolation by distance model with no traces of natural selection (no evidence of outlier loci). In contrast, S. zebrina, which has its equatorward range edge at the transition zone, displayed a pronounced genetic break approximately at 32–34°S, along a region of marked environmental heterogeneity in association with a semi‐permanent coastal upwelling regime. For S. zebrina we also found 43 outlier loci associated with this genetic break, with a significant proportion of them clustering in a single linkage group. This marked difference in the presence of outlier loci between species suggests that they could be responding differently to local environmental challenges found at their overlapping geographic range edges, thus providing important new insights about genomic changes around biogeographic transition zones in sister species and the forces that shape genetic diversity in intertidal marine species.

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Section: Discussionmentioning

confidence: 99%

Population genomic analyses reveal hybridization and marked differences in genetic structure of Scurria limpet sister species with parapatric distributions across the South Eastern Pacific

Saenz‐Agudelo

Peluso

Nespolo

et al. 2022

Ecology and Evolution

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“…Introgression and mitochondrial capture are likely scenarios for this group given that they often occur sympatrically, are closely related, and have only recently radiated (e.g., Foltz, 1997; Mallet, Besansky, & Hahn, 2015). Although hybridization has been considered rare in marine invertebrates, previous work has shown evidence for introgression in several broadcast spawning invertebrates, including bivalves (e.g., Gardner, Skibinski, & Bajdik, 1993), ascidians (Nydam & Harrison, 2010; Nydam et al., 2017), and corals (Vollmer & Palumbi, 2002; Willis, van Oppen, Miller, Vollmer, & Ayre, 2006). Evidence for introgressive hybridization in Chromodoris is particularly intriguing given that they do not broadcast spawn but rather engage in copulation as simultaneous hermaphrodites.…”

Section: Discussionmentioning

confidence: 99%

Mimicry and mitonuclear discordance in nudibranchs: New insights from exon capture phylogenomics

Layton

Carvajal

Wilson

2020

Ecology and Evolution

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“…Ocean currents are a key physical feature of the marine environment, influencing species' diversity, distribution, reproduction and abundance [1]. Considering the vast majority of marine organisms are broadcast spawners with pelagic larval dispersal [2,3], ocean current dynamics directly impact their population connectivity, recruitment patterns, stock and population genetic structures, physiology, morphology and behaviour [4][5][6]. Developing an understanding of how currents and other oceanographic factors influence key life-history traits of marine organisms is vital for their conservation and management, particularly for species that are important fisheries or aquaculture resources [7].…”

Section: Introductionmentioning

confidence: 99%

Understanding marine larval dispersal in a broadcast-spawning invertebrate: A dispersal modelling approach for optimising spat collection of the Fijian black-lip pearl oyster Pinctada margaritifera

et al. 2020

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Fisheries and aquaculture industries worldwide remain reliant on seed supply from wild populations, with their success and sustainability dependent on consistent larval recruitment. Larval dispersal and recruitment in the marine environment are complex processes, influenced by a multitude of physical and biological factors. Biophysical modelling has increasingly been used to investigate dispersal and recruitment dynamics, for optimising management of fisheries and aquaculture resources. In the Fiji Islands, culture of the blacklip pearl oyster (Pinctada margaritifera) is almost exclusively reliant on wild-caught juvenile oysters (spat), through a national spat collection programme. This study used a simple Lagrangian particle dispersal model to investigate current-driven larval dispersal patterns, identify potential larval settlement areas and compare simulated with physical spat-fall, to inform targeted spat collection efforts. Simulations successfully identified country-wide patterns of potential larval dispersal and settlement from 2012-2015, with east-west variations between biannual spawning peaks and circulation associated with El Niño Southern Oscillation. Localised regions of larval aggregation were also identified and compared to physical spat-fall recorded at 28 spat collector deployment locations. Significant and positive correlations at these sites across three separate spawning seasons (r(26) = 0.435; r(26) = 0.438; r (26) = 0.428 respectively, p = 0.02), suggest high utility of the model despite its simplicity, for informing future spat collector deployment. Simulation results will further optimise black-lip pearl oyster spat collection activity in Fiji by informing targeted collector deployments, while the model provides a versatile and highly informative toolset for the fishery management and aquaculture of other marine taxa with similar life histories.

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Introgression in two species of broadcast spawning marine invertebrate

Cited by 14 publications

References 67 publications

Population genomic analyses reveal hybridization and marked differences in genetic structure of Scurria limpet sister species with parapatric distributions across the South Eastern Pacific

Population genomic analyses reveal hybridization and marked differences in genetic structure of Scurria limpet sister species with parapatric distributions across the South Eastern Pacific

Mimicry and mitonuclear discordance in nudibranchs: New insights from exon capture phylogenomics

Understanding marine larval dispersal in a broadcast-spawning invertebrate: A dispersal modelling approach for optimising spat collection of the Fijian black-lip pearl oyster Pinctada margaritifera

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