Coral Reefs

, Volume 36, Issue 3, pp 735–748 | Cite as

Connecting Palau’s marine protected areas: a population genetic approach to conservation

  • Annick Cros
  • Robert J. Toonen
  • Megan J. Donahue
  • Stephen A. Karl
Report

Abstract

Bleaching events are becoming more frequent and are projected to become annual in Micronesia by 2040. To prepare for this threat, the Government of Palau is reviewing its marine protected area network to increase the resilience of the reefs by integrating connectivity into the network design. To support their effort, we used high-throughput sequencing of microsatellites to create genotypes of colonies of the coral Acropora hyacinthus to characterize population genetic structure and dispersal patterns that led to the recovery of Palau’s reefs from a 1998 bleaching event. We found no evidence of a founder effect or refugium where colonies may have survived to recolonize the reef. Instead, we found significant pairwise F′st values, indicating population structure and low connectivity among most of the 25 sites around Palau. We used kinship to measure genetic differences at the individual level among sites and found that differences were best explained by the degree of exposure to the ocean [F1,20 = 3.015, Pr(>F) = 0.01], but with little of the total variation explained. A permutation test of the pairwise kinship coefficients revealed that there was self-seeding within sites. Overall, the data point to the population of A. hyacinthus in Palau recovering from a handful of surviving colonies with population growth primarily from self-seeding and little exchange among sites. This finding has significant implications for the management strategies for the reefs of Palau, and we recommend increasing the number and distribution of management areas around Palau to capture the genetic architecture and increase the chances of protecting potential refuges in the future.

Keywords

Microsatellites Connectivity Oceanographic modeling Genetic architecture 

Supplementary material

338_2017_1565_MOESM1_ESM.pdf (21.7 mb)
Fig. S1 clumpak summary plots of Bayesian clustering algorithm of the genotypes of colonies at 25 sites in Palau implemented in structure with a no-admixture model with location as a prior for K = 2 to 4 (PDF 22268 kb)
338_2017_1565_MOESM2_ESM.docx (53 kb)
Supplementary material 2 (DOCX 53 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Annick Cros
    • 1
  • Robert J. Toonen
    • 1
  • Megan J. Donahue
    • 1
  • Stephen A. Karl
    • 1
  1. 1.Hawai‘i Institute of Marine BiologyUniversity of Hawai‘i, MānoaKāne‘oheUSA

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