Identifying resilient individuals of Pocillopora verrucosa (Ellis & Solander, 1786): insights from diversity assessments for coral restoration
DOI:
https://doi.org/10.15517/h7pzq822Keywords:
haplotype; branching coral; Eastern Tropical Pacific; molecular markers; resistance.Abstract
Introduction: The genus Pocillopora comprises coral species distributed throughout tropical and subtropical regions. In the Central Mexican Pacific region, Pocillopora verrucosa is the main reef-building species. In response to the recent decline in coral coverage, restoration protocols have been implemented over the past decade. However, to date, no genetic diversity records are available as potential markers to evaluate the effect of assisted recruitment on site dynamics in the area.
Objective: Determine the genetic diversity of P. verrucosa in an insular (Islas Marietas National Park) and a coastal (Punta de Mita) restoration site within the Central Mexican Pacific.
Methods: A 2 cm2 fragment from 15 colonies per site was collected. Mitochondrial markers for the COI and ATP6 genes were amplified. A total of 40 sequences of the COI (n = 19) and ATP6 (n = 21) genes were obtained, and the haplotype and nucleotide diversity were determined.
Results: For the COI gene, two haplotypes shared between the sites were identified, with H1 being the most abundant. For the ATP6 gene, one exclusive haplotype was detected in Islas Marietas National Park, and one more abundant haplotype was shared between the two sites. The AMOVA results revealed a homogeneous pattern with Fst values of 0.21603 (p < 0.10655) for COI and Fst = 0.04174 (p < 0.3753) for ATP6.
Conclusions: The low genetic diversity suggests that, as previously reported, asexual reproduction has been the predominant mode throughout the site’s history, and that the assisted propagation implemented may promote the maintenance of the individuals that have historically shown resistance to thermal stressors. However, it is essential to explore alternative propagation techniques in future restoration initiatives, as the long-term success of restoration also relies on reducing the vulnerability of these ecosystems to future environmental stressors.
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