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Fig. 3 in Observations on the mortality of olive ridley sea turtles (Lepidochelys olivacea) and associated factors along Ganjam coast, east coast of India

Fig. 3 — Spatial observations of turtle mortality: a) Fishing vs non-fishing beaches; and b) Distance from fish landing center

Fig. 2 in Observations on the mortality of olive ridley sea turtles (Lepidochelys olivacea) and associated factors along Ganjam coast, east coast of India

Fig. 2 — Observed turtle mortality in different locations (Site codes: PP-PB: Podampeta – Puranabandha, RE – NN: Rushikulya Estuary – Nalia Nuagan, GB – MR: Golabandha – Markandi, BE – PS: Bahuda Estuary – Pati Sonapur)

Fig. 5 in Possible hybridization between East Pacific Green Chelonia mydas and Olive Ridley Lepidochelys olivacea sea turtles in northwest Mexico

Fig. 5. Healthy neonate turtles presenting characteristics of both East Pacific Green and Olive Ridley Turtles photographed before release. Photos by C.E. Hart (A) and F. Sanchez (B).

Fig. 6 in Possible hybridization between East Pacific Green Chelonia mydas and Olive Ridley Lepidochelys olivacea sea turtles in northwest Mexico

Fig. 6. Olive Ridley neonate from Nayarit with the commonly found coloration of fine white border to carapace and fore flippers. This coloration is not reported in the literature for this species. Photos by C.E. Hart.

Fig. 4 in Possible hybridization between East Pacific Green Chelonia mydas and Olive Ridley Lepidochelys olivacea sea turtles in northwest Mexico

Fig. 4. Deceased hatchling presenting (A) white coloration to the carapace and flipper border, and (B) the white plastron characteristic of East Pacific Green Turtles, while presenting (C) a typical Olive Ridley carapace and head. Photos by C.E. Hart.

Fig. 3 in Possible hybridization between East Pacific Green Chelonia mydas and Olive Ridley Lepidochelys olivacea sea turtles in northwest Mexico

Fig. 3. Embryo from an Olive Ridley nest, clearly displaying East Pacific Green Turtle coloration on both (A) plastron and flippers, and (B) carapace. Photos by C.E. Hart. Table 1. Morphological features of putative hybrid neonate turtles compared to those usually reported for Lepidochelys olivacea and Chelonia mydas.

Fig. 2 in Possible hybridization between East Pacific Green Chelonia mydas and Olive Ridley Lepidochelys olivacea sea turtles in northwest Mexico

Fig. 2. Carapace (A) and plastron (B) of Lepidochelys olivacea (L.o.) and Chelonia mydas (C.m.) hatchlings.

Fig. 1 in Possible hybridization between East Pacific Green Chelonia mydas and Olive Ridley Lepidochelys olivacea sea turtles in northwest Mexico

Fig. 1. Northwest Mexico. Circles denote nesting beaches where suspected hybrid hatchlings have been observed.

opencc-zeroJan 2024View details →

Linked collectors and determiners for: Genética poblacional y filogeografía de las tortugas marinas golfina (Lepidochelys olivacea) y laúd (Dermochelys coriacea) en el Pacífico mexicano.

Natural history specimen data linked to collectors and determiners held within, "Genética poblacional y filogeografía de las tortugas marinas golfina (Lepidochelys olivacea) y laúd (Dermochelys coriacea) en el Pacífico mexicano". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/1c38e2cb-77fc-4bd0-87b9-f312c8a9e2c9">https://bionomia.net/dataset/1c38e2cb-77fc-4bd0-87b9-f312c8a9e2c9</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/1c38e2cb-77fc-4bd0-87b9-f312c8a9e2c9">https://gbif.org/dataset/1c38e2cb-77fc-4bd0-87b9-f312c8a9e2c9</a>. Formatted as a Frictionless Data package.

Fig. 6 in Observations on the mortality of olive ridley sea turtles (Lepidochelys olivacea) and associated factors along Ganjam coast, east coast of India

Fig. 6 — Association of beach elevation with turtle mortality

Fig. 5 in Observations on the mortality of olive ridley sea turtles (Lepidochelys olivacea) and associated factors along Ganjam coast, east coast of India

Fig. 5 — Changes in the Rushikulya river mouth during the last two decades

Fig. 4 — A dead olive ridley with a in Observations on the mortality of olive ridley sea turtles (Lepidochelys olivacea) and associated factors along Ganjam coast, east coast of India

Fig. 4 — A dead olive ridley with a possible hit mark on its carapace

Fig. 1 in Observations on the mortality of olive ridley sea turtles (Lepidochelys olivacea) and associated factors along Ganjam coast, east coast of India

Fig. 1 — Study area map with survey locations

opencc-zeroJul 2021View details →

Data from: Large-scale connectivity, cryptic population structure, and relatedness in Eastern Pacific olive ridley sea turtles (Lepidochelys olivacea)

<p>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 pre-existing 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<0.001). Across the Eastern Tropical Pacific, ordination suggested nine cryptic clusters with moderate structuring (FST=0.103, p<0.001) that largely corresponded to Mexican and Central American populations. All ordination clusters displayed significant internal relatedness relative to global relatedness (p<0.001) 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.</p>

opencc-zeroDec 2017View details →

Data from: Isolation by environment in the highly mobile olive ridley turtle (Lepidochelys olivacea) in the eastern Pacific

Spatial and temporal scales at which processes modulate genetic diversity over the landscape are usually overlooked, impacting the design of conservation management practices for widely distributed species. We examine processes shaping population divergence in highly mobile species by re-assessing the case of panmixia in the iconic olive ridley turtle from the eastern Pacific. We implemented a biophysical model of connectivity and a seascape genetic analysis based on nuclear DNA variation of 634 samples collected from 27 nesting areas. Two genetically distinct populations largely isolated during reproductive migrations and mating were detected, each composed of multiple nesting sites linked by high connectivity. This pattern was strongly associated with a steep environmental gradient and also influenced by ocean currents. These findings relate to meso-scales features of a dynamic oceanographic interface in the eastern tropical Pacific (ETP) region, a scenario that possibly provides different cost-benefit solutions and selective pressures for sea turtles during both the mating and migration periods. We reject panmixia and propose a new paradigm for olive ridley turtles where reproductive isolation due to assortative mating is linked to its environment. Our study demonstrates the relevance of integrative approaches for assessing the role of environmental gradients and oceanographic currents as drivers of genetic differentiation in widely distributed marine species. This is relevant for the conservation management of species of highly mobile behaviour; and assists the planning and development of large-scale conservation strategies for the threatened olive ridley turtles in the ETP.

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Figure 2 in Repeated sampling adds to the genetic diversity of Lepidochelys olivacea (Eschscholtz 1829) olive ridley sea turtle

Figure 2. Map of sea turtle migration for five tagged olive ridley sea turtles nesting on Campamento Tortuguero La Gloria, Jalisco, Mexico. Sea turtles with haplotype MLK are observed swimming into the pelagic zone in a south-southwest direction, and along the coast (solid line). The single sea turtle with the haplotype MLN also swam in a south-southwest direction (dotted line).

opennotspecifiedJan 2019View details →

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Figure 1. Haplotype network derived from 704 in Repeated sampling adds to the genetic diversity of Lepidochelys olivacea (Eschscholtz 1829) olive ridley sea turtle

Figure 1. Haplotype network derived from 704 bp mitochondrial D-loop fragment. Circle sizes are proportional to the frequency of each haplotype. The black circles are hypothetical haplotypes not sampled. Each colour represents the ocean basin where the sample was taken: blue is Pacific Ocean, yellow is Indian Ocean, red is Atlantic Ocean, and green is Indo-Pacific Ocean.

opennotspecifiedJan 2019View details →

opencc-zeroSep 2021View details →

Evolutionary comparisons of Chelonid alphaherpesvirus 5 (ChHV5) Genomes from Fibropapillomatosis-afflicted green (Chelonia mydas), Olive ridley (Lepidochelys olivacea) and Kemp's ridley (Lepidochelys kempii) sea turtles

<p>The spreading global sea turtle fibropapillomatosis (FP) epizootic is threatening some of Earth's ancient reptiles, adding to the plethora of threats faced by these keystone species. Understanding this neoplastic disease and its likely aetiological pathogen, chelonid alphaherpesvirus 5 (ChHV5), is crucial to understand how the disease impacts sea turtle populations and species and the future trajectory of disease incidence. We generated 20 ChHV5 genomes, from three sea turtle species, to better understand the viral variant diversity and gene evolution of this oncogenic virus. We revealed previously underappreciated genetic diversity within this virus (with an average of 2035 single nucleotide polymorphisms (SNPs), 1.54% of the ChHV5 genome) and identified genes under the strongest evolutionary pressure. Furthermore, we investigated the phylogeny of ChHV5 at both genome and gene level, confirming the propensity of the virus to be interspecific, with related variants able to infect multiple sea turtle species. Finally, we revealed unexpected intra-host diversity, with up to 0.15% of the viral genome varying between ChHV5 genomes isolated from different tumours concurrently arising within the same individual. These findings offer important insights into ChHV5 biology and provide genomic resources for this oncogenic virus.</p>

publicJan 2021View details →

Data from: Large-scale connectivity, cryptic population structure, and relatedness in Eastern Pacific olive ridley sea turtles (Lepidochelys olivacea)

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