710 results match your criteria chelonia mydas

An integrative approach to define chemical exposure threshold limits for endangered sea turtles.

J Hazard Mater 2021 Jul 4;420:126512. Epub 2021 Jul 4.

Australian Rivers Institute, School of Environment and Science, Griffith University, Gold Coast, Australia.

Environmental contaminants pose serious health threats to marine megafauna species, yet methods defining exposure threshold limits are lacking. Here, a three-pillar chemical risk assessment framework is presented based on (1) species- and chemical-specific lifetime bioaccumulation modelling, (2) non-destructive in vitro and in vivo toxicity threshold assessment, and (3) chemical risk quantification. We used the effects of cadmium (Cd) in green sea turtles (Chelonia mydas) as a proof of concept to evaluate the quantitative mechanistic modelling approach. Read More

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Lipid profiling suggests species specificity and minimal seasonal variation in Pacific Green and Hawksbill Turtle plasma.

PLoS One 2021 19;16(7):e0253916. Epub 2021 Jul 19.

Department of Biology, Purdue University-Fort Wayne, Fort Wayne, IN, United States of America.

In this study, we applied multiple reaction monitoring (MRM)-profiling to explore the relative ion intensity of lipid classes in plasma samples from sea turtles in order to profile lipids relevant to sea turtle physiology and investigate how dynamic ocean environments affect these profiles. We collected plasma samples from foraging green (Chelonia mydas, n = 28) and hawksbill (Eretmochelys imbricata, n = 16) turtles live captured in North Pacific Costa Rica in 2017. From these samples, we identified 623 MRMs belonging to 10 lipid classes (sphingomyelin, phosphatidylcholine, free fatty acid, cholesteryl ester, phosphatidylserine, phosphatidylinositol, phosphatidylglycerol, phosphatidylethanolamine, ceramide, and triacylglyceride) and one metabolite group (acyl-carnitine) present in sea turtle plasma. Read More

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High accuracy tracking reveals how small conservation areas can protect marine megafauna.

Ecol Appl 2021 Jul 18:e02418. Epub 2021 Jul 18.

Department of Biosciences, Swansea University, Swansea, Wales, SA2 8PP, UK.

Space use estimates can inform conservation management but relaying high-accuracy locations is often not straightforward. We used Fastloc-GPS Argos satellite tags with the innovation of additional data relay via a ground station (termed a "Mote") to record high volumes (typically > 20 locations per individual per day) of high accuracy tracking data. Tags were attached in the Chagos Archipelago (Indian Ocean) in 2018-2019 to 23 immature turtles of two species for which there have been long-standing conservation concerns: 21 hawksbill turtles (Eretmochelys imbricata) and two green turtles (Chelonia mydas). Read More

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Fibropapillomatosis and the Chelonid Alphaherpesvirus 5 in Green Turtles from West Africa.

Ecohealth 2021 Jul 9. Epub 2021 Jul 9.

MARE - Marine and Environmental Sciences Centre, ISPA - Instituto Universitário, Rua Jardim do Tabaco 34, 1149-041, Lisbon, Portugal.

Fibropapillomatosis (FP) is a tumorigenic panzootic disease of sea turtles, most common in green turtles (Chelonia mydas). FP is linked to the chelonid alphaherpesvirus 5 (ChAHV5) and to degraded habitats and, though benign, large tumours can hinder vital functions, causing death. We analyse 108 green turtles, captured in 2018 and 2019, at key foraging grounds in Guinea-Bissau and Mauritania, West Africa, for the presence of FP, and use real-time PCR to detect ChAHV5 DNA, in 76 individuals. Read More

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Catastrophic loss of tropical seagrass habitats at the Cocos (Keeling) Islands due to multiple stressors.

Mar Pollut Bull 2021 Jul 5;170:112602. Epub 2021 Jul 5.

Centre for Sustainable Aquatic Ecosystems, Harry Butler Institute, Murdoch University, 90 South St, Murdoch, Western Australia 6150, Australia.

Seagrass habitats at the Cocos (Keeling) Islands (CKI), a remote atoll in the Indian Ocean, have suffered a catastrophic decline over the last decade. Seagrass monitoring (1996-2020) in relation to dredging and coastal development works (2009 to 2011) provide a historical baseline, and document the decline of mixed tropical seagrass Thalassia hemprichii and macroalgal (predominantly Caulerpa spp.) beds over a decadal scale time series. Read More

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Green, yellow or black? Genetic differentiation and adaptation signatures in a highly migratory marine turtle.

Proc Biol Sci 2021 Jul 7;288(1954):20210754. Epub 2021 Jul 7.

Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Santiago, Chile.

Marine species may exhibit genetic structure accompanied by phenotypic differentiation related to adaptation despite their high mobility. Two shape-based morphotypes have been identified for the green turtle () in the Pacific Ocean: the south-central/western or yellow turtle and north-central/eastern or black turtle. The genetic differentiation between these morphotypes and the adaptation of the black turtle to environmentally contrasting conditions of the eastern Pacific region has remained a mystery for decades. Read More

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Antibiotic-Resistant Bacteria in Green Turtle () Rearing Seawater.

Animals (Basel) 2021 Jun 21;11(6). Epub 2021 Jun 21.

Department of Oral Biology, Faculty of Dentistry, Mahidol University, Bangkok 10400, Thailand.

Antibiotic resistance of microorganisms is a serious health problem for both humans and animals. Infection of these bacteria may result in therapy failure, leading to high mortality rates. During an early intervention program process, the Sea Turtle Conservation Center of Thailand (STCCT) has faced high mortality rates due to bacterial infection. Read More

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Validating the use of stereo-video cameras to conduct remote measurements of sea turtles.

Ecol Evol 2021 Jun 26;11(12):8226-8237. Epub 2021 May 26.

University of West Florida Pensacola FL USA.

Point 1: Stereo-video camera systems (SVCSs) are a promising tool to remotely measure body size of wild animals without the need for animal handling. Here, we assessed the accuracy of SVCSs for measuring straight carapace length (SCL) of sea turtles. Point 2: To achieve this, we hand captured and measured 63 juvenile, subadult, and adult sea turtles across three species: greens, ( = 52); loggerheads, ( = 8); and Kemp's ridley, ( = 3) in the waters off Eleuthera, The Bahamas and Crystal River, Florida, USA, between May and November 2019. Read More

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Gene expression changes with tumor disease and leech parasitism in the juvenile green sea turtle skin transcriptome.

Gene 2021 Jun 25:145800. Epub 2021 Jun 25.

Department of Biology, University of Central Florida, Orlando, FL, United States. Electronic address:

Emerging infectious diseases are a major threat to biodiversity in the 21st century. Fibropapillomatosis (FP) is an epithelial tumor disease that affects immature and adult marine turtles worldwide, particularly green turtles (Chelonia mydas). We know little about the host factors contributing to FP susceptibility, in part because transcriptomic studies that compare transcript expression in turtles with and without FP are lacking. Read More

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Why do Argos satellite tags stop relaying data?

Ecol Evol 2021 Jun 1;11(11):7093-7101. Epub 2021 May 1.

Faculty of Science and Engineering Swansea University Swansea UK.

Satellite tracking of animals is very widespread across a range of marine, freshwater, and terrestrial taxa. Despite the high cost of tags and the advantages of long deployments, the reasons why tracking data from tags stop being received are rarely considered, but possibilities include shedding of the tag, damage to the tag (e.g. Read More

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J Zoo Wildl Med 2021 Jun;52(2):610-617

College of Veterinary Medicine and Center for Marine Sciences and Technology, North Carolina State University, Morehead City, NC 28557, USA.

Blood fatty acid profiles can indicate an animal's wild-type diet composition and fatty acid status, but have not been reported in sea turtles. Newer technologies allow for fatty acid profiles from very small (less than three drops) samples of whole blood. This study examined whole blood fatty acid profiles of presumably healthy, neritic, juvenile, wild green () ( = 9; 6 males, 3 females) and Kemp's ridley () ( = 8; 6 males, 2 females) turtles from North Carolina, USA. Read More

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Selectivity of marine-debris ingestion by juvenile green turtles (Chelonia mydas) at a South American World Heritage Listed area.

Mar Pollut Bull 2021 Aug 16;169:112574. Epub 2021 Jun 16.

Laboratório de Ecologia e Conservação, Centro de Estudos do Mar, Universidade Federal do Paraná, Av. Beira Mar s/n, 83255-000, Pontal do Sul, Paraná, Brazil. Electronic address:

Beaches in southern Brazil have substantial marine debris and strandings of dead juvenile green turtles (Chelonia mydas). This study investigates associations by quantifying marine debris (1) ingested among new (<40 cm curved carapace length; CCL) and older (≥40 cm CCL) juvenile C. mydas recruits; (2) concentrations on beach transects; and then (3) selective ingestion by C. Read More

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Detection and molecular characteristics of Pyelosomum cochlear (Digenea: Pronocephalidae) in the urinary bladder of the green sea turtle (Chelonia mydas) in the Northwest Pacific Ocean.

Infect Genet Evol 2021 Jun 8;93:104962. Epub 2021 Jun 8.

Laboratory of Veterinary Parasitology, Faculty of Agriculture, Iwate University, 3-18-8 Ueda, Morioka 020-8550, Japan. Electronic address:

The genus Pyelosomum consists of parasitic flukes occurring primarily in marine turtles; Pyelosomum cochlear Looss 1899 is the only species of this genus that parasitizes the urinary bladder. In this study, we detected flukes in the urinary bladders of 20 of 88 green sea turtles (Chelonia mydas) harvested in the Ogasawara Islands, in the Northwest Pacific Ocean. We identified the flukes as P. Read More

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Chelonid Alphaherpesvirus 5 Prevalence and First Confirmed Case of Sea Turtle Fibropapillomatosis in Grenada, West Indies.

Animals (Basel) 2021 May 21;11(6). Epub 2021 May 21.

Department of Pathobiology, School of Veterinary Medicine, St. George's University, True Blue, Grenada.

Chelonid alphaherpesvirus 5 (ChHV5) is strongly associated with fibropapillomatosis, a neoplastic disease of sea turtles that can result in debilitation and mortality. The objectives of this study were to examine green (), hawksbill (), and leatherback () sea turtles in Grenada, West Indies, for fibropapillomatosis and to utilize ChHV5-specific PCR, degenerate herpesvirus PCR, and serology to non-invasively evaluate the prevalence of ChHV5 infection and exposure. One-hundred and sixty-seven turtles examined from 2017 to 2019 demonstrated no external fibropapilloma-like lesions and no amplification of ChHV5 DNA from whole blood or skin biopsies. Read More

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Similar circling movements observed across marine megafauna taxa.

iScience 2021 Apr 18;24(4):102221. Epub 2021 Mar 18.

Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan.

Advances in biologging technology have enabled 3D dead-reckoning reconstruction of marine animal movements at spatiotemporal scales of meters and seconds. Examining high-resolution 3D movements of sharks (, N = 4; , N = 1), sea turtles (, N = 3), penguins (, N = 6), and marine mammals (, N = 4; , N = 1), we report the discovery of circling events where animals consecutively circled more than twice at relatively constant angular speeds. Similar circling behaviors were observed across a wide variety of marine megafauna, suggesting these behaviors might serve several similar purposes across taxa including foraging, social interactions, and navigation. Read More

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Species and population specific gene expression in blood transcriptomes of marine turtles.

BMC Genomics 2021 May 13;22(1):346. Epub 2021 May 13.

Department of Environmental Conservation, University of Massachusetts, Amherst, MA, USA.

Background: Transcriptomic data has demonstrated utility to advance the study of physiological diversity and organisms' responses to environmental stressors. However, a lack of genomic resources and challenges associated with collecting high-quality RNA can limit its application for many wild populations. Minimally invasive blood sampling combined with de novo transcriptomic approaches has great potential to alleviate these barriers. Read More

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Two heads are not always better than one: Craniofacial and axial bifurcation in cheloniid embryos and hatchlings (Chelonia mydas and Caretta caretta).

J Morphol 2021 Aug 20;282(8):1233-1244. Epub 2021 May 20.

Department of Biological Sciences, Florida Atlantic University, Boca Raton, Florida, USA.

Morphological data on craniofacial and axial bifurcation in sea turtles is not well documented in the literature. Here, we use micro-computed tomography (μ-CT) imaging to describe the body, skull, and vertebral morphology in axially-bifurcated cheloniid sea turtle embryos and hatchlings (Chelonia mydas and Caretta caretta) from south Florida beaches. We describe three types of craniofacial and axial bifurcations: bifacial, bicephalic, and bicephalic with biaxial duplication ranging from facial bones to the sacrum. Read More

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Creation of a peptide database of corneous beta-proteins of marine turtles for the identification of tortoiseshell: archaeological combs as case study.

R Soc Open Sci 2021 Feb 24;8(2):201857. Epub 2021 Feb 24.

Smithsonian's Museum Conservation Institute, 4210 Silver Hill Road, Suitland, MD 20746, USA.

Tortoiseshell is a proteinaceous material derived from the scutes of marine turtles, and was shaped into an abundance of objects, especially luxurious items, at its peak in the seventeenth and eighteenth century. It has continued to be used even after the advent of plastics and remains one of the main causes of illegal poaching of marine turtles, in particular the hawksbill turtle . Tortoiseshell is made of structural proteins, of which the most abundant are known as β-keratins, or 'corneous beta-proteins' (CBPs), a family of short proteins containing a central structure in β-sheets. Read More

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February 2021

Detection and molecular characteristics of Rhytidodoides sp. (Digenea: Rhytidodidae) from the gall bladder of green sea turtles (Chelonia mydas) in the Ogasawara Islands, Japan.

Parasitol Int 2021 Aug 7;83:102377. Epub 2021 May 7.

Laboratory of Parasitology, Faculty of Veterinary medicine, Okayama University of Science, 1-3 Ikoinooka, Imabari 794-8555, Japan.

Trematodes of the genus Rhytidodoides are parasitic in marine turtles. Of the already known species, Rhytidodoides similis Price, 1939, occurs especially in the gall bladder. In this study, we surveyed 73 green sea turtles (Chelonia mydas) in the Ogasawara Islands, Japan, and detected Rhytidodoides sp. Read More

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Plasma proteomics of green turtles () reveals pathway shifts and potential biomarker candidates associated with health and disease.

Conserv Physiol 2021 28;9(1):coab018. Epub 2021 Apr 28.

Loggerhead Marinelife Center, 14200 US Highway One, Juno Beach, FL 33408, USA.

Evaluating sea turtle health can be challenging due to an incomplete understanding of pathophysiologic responses in these species. Proteome characterization of clinical plasma samples can provide insights into disease progression and prospective biomarker targets. A TMT-10-plex-LC-MS/MS platform was used to characterize the plasma proteome of five, juvenile, green turtles () and compare qualitative and quantitative protein changes during moribund and recovered states. Read More

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Enrichment devices for green turtles (Chelonia mydas) reared in captivity programs.

Zoo Biol 2021 May 5. Epub 2021 May 5.

Program in Marine and Coastal Resources Management Technology, School of Science, Walailak University, Nakhon Si Thammarat, Thailand.

Environmental enrichment supports the well-being and welfare of captive animals. In the current study, the most suitable form of enrichment device for captive green turtles (Chelonia mydas) was investigated, to support head-start programs rearing turtles for release into their natural habitat. Fifteen-day-old turtles (113-114 g initial weight, n = 75) were randomly distributed into 15 experimental plastic tanks, comprising 5 treatments across three pools of each condition. Read More

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First Atlantic satellite tracks of 'lost years' green turtles support the importance of the Sargasso Sea as a sea turtle nursery.

Proc Biol Sci 2021 05 12;288(1950):20210057. Epub 2021 May 12.

Department of Marine Ecology and Society, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL 33149, USA.

In-water behaviour and long-term movements of oceanic-stage juvenile sea turtles are not well described or quantified. This is owing to technological or logistical limitations of tracking small, fast-growing animals across long distances and time periods within marine habitats. Here, we present, to our knowledge, the first long-term offshore tracks of oceanic green turtles () in western North Atlantic waters. Read More

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High frequency of micro- and meso-plastics ingestion in a sample of neonate sea turtles from a major rookery.

Mar Pollut Bull 2021 Jun 22;167:112363. Epub 2021 Apr 22.

Inwater Research Group, Inc., 4160 NE Hyline Dr., Jensen Beach, FL 34957, USA.

We studied marine litter ingestion in 380 neonate sea turtles that washed ashore dead onto Florida's central Atlantic coast (USA) following onshore winds. Our sample of "washbacks" included 284 loggerheads (Caretta caretta), 95 green turtles (Chelonia mydas), and one hawksbill (Eretmochelys imbricata). Of these, 78. Read More

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Plastic ingestion by juvenile green turtles (Chelonia mydas) off the coast of Southern Brazil.

Mar Pollut Bull 2021 Jun 21;167:112337. Epub 2021 Apr 21.

Laboratório de Ornitologia e Animais Marinhos, Universidade do Vale do Rio dos Sinos, Av. Unisinos, 93.022-750 Rio Grande do Sul, Brazil.

Five of the seven extant sea turtle species in the world forage on the coast of Southern Brazil at least in some stage of their life cycle. The green turtle Chelonia mydas frequently strands on beaches of Rio Grande do Sul State. The species is currently classified as vulnerable to extinction in the region, and pollution by marine debris is one of the most conspicuous threats to its conservation. Read More

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Desmogonius baldassinae n. sp. (Digenea: Pronocephalidae) collected in a green sea turtle-Chelonia mydas-from Brazil.

Parasitol Res 2021 Jun 20;120(6):2281-2285. Epub 2021 Apr 20.

School of Marine and Tropical Biology, James Cook University, Townsville, Queensland, 4811, Australia.

The genus Desmogonius (Digenea: Pronocephalidae) is known only from sea turtles and currently contains two species: D. desmogonius Stephens, 1911 and D. loossi Chattopadhyaya, 1972. Read More

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J Zoo Wildl Med 2021 Apr;52(1):295-299

Department of Biomedical and Diagnostic Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, Tennessee 37996, USA.

The objective of this study was to determine the pharmacokinetics of a single dose of meloxicam administered subcutaneously (SQ) to three species of sea turtles: loggerheads (), Kemp's ridley (), and greens (). A dose of 1 mg/kg was given to the Kemp's ridleys and greens, whereas the loggerheads received 2 mg/kg. After SQ administration, the half-life (t1/2) of meloxicam administered at 1 mg/kg in the Kemp's ridleys was 5. Read More

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The Concurrent Detection of Chelonid Alphaherpesvirus 5 and Papillomavirus 1 in Tumoured and Non-Tumoured Green Turtles.

Animals (Basel) 2021 Mar 5;11(3). Epub 2021 Mar 5.

College of Public Health, Medical and Veterinary Sciences, James Cook University, Townsville, QLD 4814, Australia.

Characterised by benign tumours, fibropapillomatosis (FP) is a debilitating disease that predominantly afflicts the endangered green turtle (). A growing body of histological and molecular evidence has associated FP tumours with Chelonid alphaherpesvirus 5 (ChHV5). However, a recent study which detected both ChHV5 and papillomavirus 1 (CmPV1) DNA in FP tumour tissues has challenged this hypothesis. Read More

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Insights on Immune Function in Free-Ranging Green Sea Turtles () with and without Fibropapillomatosis.

Animals (Basel) 2021 Mar 18;11(3). Epub 2021 Mar 18.

Harbor Branch Oceanographic Institute, Florida Atlantic University, Fort Pierce, FL 34946, USA.

Chelonid alphaherpesviruses 5 and 6 (ChHV5 and ChHV6) are viruses that affect wild sea turtle populations. ChHV5 is associated with the neoplastic disease fibropapillomatosis (FP), which affects green turtles () in panzootic proportions. ChHV6 infection is associated with lung-eye-trachea disease (LETD), which has only been observed in maricultured sea turtles, although antibodies to ChHV6 have been detected in free-ranging turtles. Read More

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Persistent organic pollutants in plasma and stable isotopes in red blood cells of Caretta caretta, Chelonia mydas and Lepidochelys olivacea sea turtles that nest in Brazil.

Mar Pollut Bull 2021 Jun 31;167:112283. Epub 2021 Mar 31.

Universidade de São Paulo, Instituto Oceanográfico, Laboratório de Química Orgânica Marinha, Praça do Oceanográfico 191, São Paulo, SP 05508-120, Brazil.

Studies of persistent organic pollutants (POPs), such as polychlorinated biphenyls (PCBs), organochlorinated pesticides (OCPs), and polybrominated diphenyl ethers (PBDEs), in sea turtles are reported, but there are still spatial data gaps worldwide. POP contamination of live female blood plasma from Caretta caretta (n = 28), Chelonia mydas (n = 31) and Lepidochelys olivacea (n = 19), which nest in Brazil and feed along the South Atlantic Ocean, was investigated. Carbon and nitrogen stable isotopes from red blood cells (RBC) were also evaluated to obtain information about trophic ecology. Read More

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Sea turtles across the North Pacific are exposed to perfluoroalkyl substances.

Environ Pollut 2021 Jun 15;279:116875. Epub 2021 Mar 15.

Hawai'i Pacific University, Center for Marine Debris Research, Waimānalo, HI, USA; National Institute of Standards and Technology, Chemical Sciences Division, Waimānalo, HI, USA. Electronic address:

Perfluorinated alkyl substances (PFASs) are global, persistent, and toxic contaminants. We assessed PFAS concentrations in green (Chelonia mydas) and hawksbill (Eretmochelys imbricata) turtles from the North Pacific. Fifteen compounds were quantified via liquid chromatography tandem mass spectrometry from 62 green turtle and 6 hawksbill plasma samples from Hawai'i, Palmyra Atoll, and the Northern Marianas Islands. Read More

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