First report of an olive ridley (Lepidochelys olivacea) inside the Mediterranean Sea

Revuelta, Ohiana; Carreras, Carlos; Doménech, Francesc Quiquet de Castàlia Vicent; Gozalbes, Patricia; Tòmàs, Jesús

doi:10.12681/mms.1131

Cited by 6 publications

(8 citation statements)

References 19 publications

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“…The exchange of nesting beaches might form part of a complex phenomenon that the olive ridley turtle uses to colonize new areas or even completely change its nesting site (Tripathy and Pandav, 2008). A recent and novel report describes a female stranded in the Mediterranean Sea in the province of Castellon, Spain (KP117262; Revuelta et al, 2015), a region where the olive ridley turtle does not usually nest, and the haplotype identified for this individual turtle matches reports of haplotype F from the Atlantic (AF051773; Bowen et al, 1998). According to the MSN topology and a mismatch distribution analysis, the rookery of Ceuta beach belongs to a population that recently (on the evolutionary scale) expanded demographically (Grant and Bowen, 1998), and this notion agrees with that proposed by López-Castro and Rocha-Olivares (2005) for Mexican rookeries of olive ridley turtle nesting.…”

Section: Discussionmentioning

confidence: 99%

Haplotypic characterization of the olive ridley turtle (Lepidochelys olivacea) in northwest Mexico: the northernmost limit of its distribution

Campista-León¹,

Espinoza²,

Cornejo³

et al. 2019

Anim. Biodiv. Conserv.

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Haplotypic characterization of the olive ridley turtle (Lepidochelys olivacea) in northwest Mexico: the northernmost limit of its distribution. The olive ridley sea turtle (L. olivacea) has a pantropical distribution. In the Eastern Pacific, the official limits of its reproduction area are south of the Baja California peninsula and south of Sinaloa, Mexico. Ceuta beach in Elota, Sinaloa, Mexico, has served as a protection site for L. olivacea for over three decades. In this study, the L. olivacea population from Ceuta beach was genetically characterized. Specifically, a 712-bp fragment from the control region of mtDNA was amplified from 32 olive ridley turtles. Eight haplotypes (seven after cutting to ~468 bp) were identified, and these included two novel haplotypes (Lo-T7 and Lo-T8) and five haplotypes that were previously identified in other nesting beaches. The Lo-T2 haplotype was dominant (~60 %) in the samples: h = 0.6048 (± 0.0974) and π = 0.002212 (± 0.001504). Although this study was conducted in the northernmost limit of the olive ridley turtle nesting distribution in the eastern Pacific, the sampled group presents moderate genetic diversity and belongs to a population that, on an evolutionary scale, only recently underwent demographic expansion. Because the olive ridley turtle in the eastern Pacific is considered resilient to environmental variation, nesting area studies in northwest Mexico are necessary.

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Section: Discussionmentioning

confidence: 99%

Haplotypic characterization of the olive ridley turtle (Lepidochelys olivacea) in northwest Mexico: the northernmost limit of its distribution

Campista-León¹,

Espinoza²,

Cornejo³

et al. 2019

Anim. Biodiv. Conserv.

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“…4). Loggerhead turtles are also known to frequent some neritic areas in the western Mediterranean, such as the Spanish continental shelf (Bertolero 2003, Cardona et al 2009and references therein, Álvarez de Quevedo et al 2010, Domènech et al 2015, the Balearic Islands (Carreras et al 2004) and the southwestern coasts of Italy (Hochscheid et al 2007) (Fig. 4), although probably at lower levels of abundance.…”

Section: Neritic Foraging and Wintering Areasmentioning

confidence: 99%

“…Time underwater and activity vary seasonally, and single dives can last several hours in winter when water temperatures fall below 15°C and turtles go into a quiescent period during which they mainly rest on the seafloor (Hochscheid et al 2005, Broderick et al 2007. These dormant turtles are more prone to bycatch by bottom trawlers (Casale et al 2004, Domènech et al 2015 because their low metabolism at cooler temperatures makes them slow to respond to such threats (Hochscheid et al 2004). Table S12 and appears to be higher in the oceanic than in the neritic part of the migration.…”

Section: Swimming Orienting and Divingmentioning

confidence: 99%

“…The Mediterranean is also frequented by turtles originating from Atlantic rookeries, including large numbers of loggerhead turtles (Encalada et al 1998, Carreras et al 2011, Clusa et al 2014) and a limited number of leatherback turtles Dermochelys coriacea (Casale et al 2003), and green, olive ridley Lepidochelys olivacea and Kemp's ridley turtles L. kempii (Tomás & Raga 2008, Carreras et al 2014, Revuelta et al 2015).…”

Section: Introductionmentioning

confidence: 99%

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Mediterranean sea turtles: current knowledge and priorities for conservation and research

Casale¹,

Broderick²,

Camiñas³

et al. 2018

Endang. Species. Res.

187

227

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The available information regarding the 2 sea turtle species breeding in the Mediterranean (loggerhead turtle Caretta caretta and green turtle Chelonia mydas) is reviewed, including biometrics and morphology, identification of breeding and foraging areas, ecology and behaviour, abundance and trends, population structure and dynamics, anthropogenic threats and conservation measures. Although a large body of knowledge has been generated, research efforts have been inconsistently allocated across geographic areas, species and topics. Significant gaps still exist, ranging from the most fundamental aspects, such as the distribution of major nesting sites and the total number of clutches laid annually in the region, to more specific topics like age at maturity, survival rates and behavioural ecology, especially for certain areas (e.g. southeastern Mediterranean). These gaps are particularly marked for the green turtle. The recent positive trends of nest counts at some nesting sites may be the result of the cessation of past exploitation and decades of conservation measures on land, both in the form of national regulations and of continued active protection of clutches. Therefore, the current status should be considered as dependent on such ongoing conservation efforts. Mitigation of incidental catch in fisheries, the main anthropogenic threat at sea, is still in its infancy. From the analysis of the present status a comprehensive list of re search and conservation priorities is proposed.

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“…Forward and reverse sequences were trimmed to approximately 800 bps, assembled, and aligned in Geneious v.11 (Kearse et al, 2012) using the CLUSTALW algorithm (Thompson, Gibson, & Higgins, 2003). Olive ridley mtCR haplotypes (~800bp) from prior studies (Bahri, Atmadipoera, & Madduppa, 2018;Bowen et al, 1997;Campista León et al, 2019;Jensen et al, 2013;López-Castro & Rocha-Olivares, 2005;Plot et al, 2012;Revuelta, 2015;Shanker, Ramadevi, Choudhury, Singh, & Aggarwal, 2004) were procured from GenBank and aligned with haplotypes from this study. New and existing haplotypes from Costa Rica were determined using DnaSP 6 (Rozas et al, 2017).…”

Section: Mtcr Analysismentioning

confidence: 99%

Large‐scale connectivity, cryptic population structure, and relatedness in Eastern Pacific Olive ridley sea turtles (Lepidochelys olivacea)

Silver‐Gorges

Koval

Rodríguez-Zárate³

et al. 2020

Ecology and Evolution

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Endangered species are grouped into genetically discrete populations to direct conservation efforts. Mitochondrial control region (mtCR) haplotypes are used to elucidate deep divergences between populations, as compared to nuclear microsatellites that can detect recent structuring. When prior populations are unknown, it is useful to subject microsatellite data to clustering and/or ordination population inference. Olive ridley sea turtles (Lepidochelys olivacea) are the most abundant sea turtle, yet few studies have characterized olive ridley population structure. Recently, clustering results of olive ridleys in the Eastern Tropical Pacific Ocean suggested weak structuring (FST = 0.02) between Mexico and Central America. We analyzed mtCR haplotypes, new microsatellite genotypes from Costa Rica, and preexisting microsatellite genotypes from olive ridleys across the Eastern Tropical Pacific, to further explore population structuring in this region. We subjected inferred populations to multiple analyses to explore the mechanisms behind their structuring. We found 10 mtCR haplotypes from 60 turtles nesting at three sites in Costa Rica, but did not detect divergence between Costa Rican sites, or between Central America and Mexico. In Costa Rica, clustering suggested one population with no structuring, but ordination suggested four cryptic clusters with moderate structuring (FST = 0.08, p < .001). Across the Eastern Tropical Pacific, ordination suggested nine cryptic clusters with moderate structuring (FST = 0.103, p < .001) that largely corresponded to Mexican and Central American populations. All ordination clusters displayed significant internal relatedness relative to global relatedness (p < .001) and contained numerous sibling pairs. This suggests that broadly dispersed family lineages have proliferated in Eastern Tropical Pacific olive ridleys and corroborates previous work showing basin‐wide connectivity and shallow population structure in this region. The existence of broadly dispersed kin in Eastern Tropical Pacific olive ridleys has implications for management of olive ridleys in this region, and adds to our understanding of sea turtle ecology and life history, particularly in light of the natal‐homing paradigm.

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First report of an olive ridley (Lepidochelys olivacea) inside the Mediterranean Sea

Cited by 6 publications

References 19 publications

Haplotypic characterization of the olive ridley turtle (Lepidochelys olivacea) in northwest Mexico: the northernmost limit of its distribution

Haplotypic characterization of the olive ridley turtle (Lepidochelys olivacea) in northwest Mexico: the northernmost limit of its distribution

Mediterranean sea turtles: current knowledge and priorities for conservation and research

Large‐scale connectivity, cryptic population structure, and relatedness in Eastern Pacific Olive ridley sea turtles (Lepidochelys olivacea)

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