Baseline assessments for coral reef community structure and demographics on West Maui : data report.

Vargas-Ángel, Bernardo; White, Darla; Storlazzi, Curt D.; Callender, Tova; Maurin, Paulo

doi:10.7289/v5/sp-pifsc-17-001

Cited by 2 publications

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Genetic structure is stronger across human-impacted habitats than among islands in the coralPorites lobata

Tisthammer

Forsman

Toonen

et al. 2019

Preprint

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We examined genetic structure in the lobe coral Porites lobata among pairs of highly variable and high-stress nearshore sites and adjacent less variable and less impacted offshore sites on the islands of Oʻahu and Maui, Hawai'i. Using an analysis of molecular variance framework, we tested whether populations were more structured by geographic distance or environmental extremes. The genetic patterns we observed followed isolation by environment, where nearshore and adjacent offshore populations showed significant genetic structure at both locations (AMOVA FST = 0.04 ~ 0.19, P < 0.001), but no significant isolation by distance between islands.In contrast, a third site with a less impacted nearshore site showed no significant structure. Strikingly, corals from the two impacted nearshore sites on different islands over 100km apart with similar environmentally stressful conditions were genetically closer (FST ~ 0, P = 0.733) than those within a single location less than 2 km apart (FST = 0.041~0.079, P < 0.01). Our results suggest that ecological boundaries appear to play a strong role in forming genetic structure in the coastal environment, and that genetic divergence in the absence of geographical barriers to gene flow may be explained by disruptive selection across contrasting habitats.# 1

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Genetic structure is stronger across human-impacted habitats than among islands in the coralPorites lobata

Tisthammer

Forsman

Toonen

et al. 2019

Preprint

View full text Add to dashboard Cite

show abstract

Genetic structure is stronger across human-impacted habitats than among islands in the coralPorites lobata

Tisthammer

Forsman

Toonen

et al. 2020

PeerJ

View full text Add to dashboard Cite

We examined genetic structure in the lobe coral Porites lobata among pairs of highly variable and high-stress nearshore sites and adjacent less variable and less impacted offshore sites on the islands of Oahu and Maui, Hawaii. Using an analysis of molecular variance framework, we tested whether populations were more structured by geographic distance or environmental extremes. The genetic patterns we observed followed isolation by environment, where nearshore and adjacent offshore populations showed significant genetic structure at both locations (AMOVA FST = 0.04∼0.19, P < 0.001), but no significant isolation by distance between islands. Strikingly, corals from the two nearshore sites with higher levels of environmental stressors on different islands over 100 km apart with similar environmentally stressful conditions were genetically closer (FST = 0.0, P = 0.73) than those within a single location less than 2 km apart (FST = 0.04∼0.08, P < 0.01). In contrast, a third site with a less impacted nearshore site (i.e., less pronounced environmental gradient) showed no significant structure from the offshore comparison. Our results show much stronger support for environment than distance separating these populations. Our finding suggests that ecological boundaries from human impacts may play a role in forming genetic structure in the coastal environment, and that genetic divergence in the absence of geographical barriers to gene flow might be explained by selective pressure across contrasting habitats.

show abstract

Baseline assessments for coral reef community structure and demographics on West Maui : data report.

Cited by 2 publications

References 0 publications

Genetic structure is stronger across human-impacted habitats than among islands in the coralPorites lobata

Genetic structure is stronger across human-impacted habitats than among islands in the coralPorites lobata

Genetic structure is stronger across human-impacted habitats than among islands in the coralPorites lobata

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