Population structure and conservation implications for the loggerhead sea turtle of the Cape Verde Islands

Catalina Monzón-Argüello, Ciro Rico, Eugenia Naro-Maciel, Nuria Varo-Cruz, Pedro López, Adolfo Marco, Luis Felipe López-Jurado

Research output: Contribution to journalArticlepeer-review

Abstract

The Cape Verde Islands harbour the second largest nesting aggregation of the globally endangered loggerhead sea turtle in the Atlantic. To characterize the unknown genetic structure, connectivity, and demographic history of this population, we sequenced a segment of the mitochondrial (mt) DNA control region (380 bp, n = 186) and genotyped 12 microsatellite loci (n = 128) in females nesting at three islands of Cape Verde. No genetic differentiation in either haplotype or allele frequencies was found among the islands (mtDNA FST = 0. 001, P > 0. 02; nDNA FST = 0. 001, P > 0. 126). However, population pairwise comparisons of the mtDNA data revealed significant differences between Cape Verde and all previously sequenced Atlantic and Mediterranean rookeries (FST = 0. 745; P < 0. 000). Results of a mixed stock analysis of mtDNA data from 10 published oceanic feeding grounds showed that feeding grounds of the Madeira, Azores, and the Canary Islands, in the Atlantic Ocean, and Gimnesies, Pitiüses, and Andalusia, in the Mediterranean sea, are feeding grounds used by turtles born in Cape Verde, but that about 43% (±19%) of Cape Verde juveniles disperse to unknown areas. In a subset of samples (n = 145) we evaluated the utility of a longer segment (~760 bp) amplified by recently designed mtDNA control region primers for assessing the genetic structure of Atlantic loggerhead turtles. The analysis of the longer fragment revealed more variants overall than in the shorter segments. The genetic data presented here are likely to improve assignment and population genetic analyses, with significant conservation and research applications.

Original languageEnglish (US)
Pages (from-to)1871-1884
Number of pages14
JournalConservation Genetics
Volume11
Issue number5
DOIs
StatePublished - 2010

Keywords

  • Caretta
  • Conservation genetics
  • Macaronesia
  • Microsatellites
  • Mitochondrial DNA
  • Population structure

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics

Fingerprint Dive into the research topics of 'Population structure and conservation implications for the loggerhead sea turtle of the Cape Verde Islands'. Together they form a unique fingerprint.

Cite this