scholarly journals Epibiont Assemblages on Nesting Hawksbill Turtles Show Site-Specificity in the Persian Gulf

2021 ◽  
Vol 9 ◽  
Author(s):  
Javad Loghmannia ◽  
Ali Nasrolahi ◽  
Mohsen Rezaie-Atagholipour ◽  
Bahram H. Kiabi
Keyword(s):  
Persian Gulf ◽  
National Park ◽  
Sea Turtle ◽  
Eretmochelys Imbricata ◽  
Lack Of Information ◽  
Harpacticoid Copepods ◽  
Study Sites ◽  
The Persian Gulf ◽  
Almost All ◽  
Hawksbill Turtles

Sea turtle epibionts can provide insights into the hosts' habitat use. However, at present, there is a lack of information on sea turtle epibiont communities in many locations worldwide. Here, we describe the epibiont communities of 46 hawksbill turtles (Eretmochelys imbricata) in the Persian Gulf. Specifically, we sampled 28 turtles from the Dayyer-Nakhiloo National Park (DNNP) in the northern Gulf and 18 turtles from Shibderaz beach in the Strait of Hormuz. A total of 54 macro, meio, and micro-epibiont taxa were identified, including 46 taxa from Shibderaz and 29 taxa from DNNP. The barnacles Chelonibia testudinaria and Platylepas hexastylos, as well as harpacticoid copepods and Rotaliid foraminifers, had the highest frequency of occurrence found on almost all turtle individuals. Harpacticoids were the most abundant epizoic taxa (19.55 ± 3.9 ind. per 9 cm2) followed by forams (Quinqueloculina spp.: 6.25 ± 1.5 ind. per 9 cm2 and Rotaliids: 6.02 ± 1.3 ind. per 9 cm2). Our results showed significant differences between the study sites in the composition of micro and macro-epibiont communities found on hawksbill turtles. We speculate that the differences in epibiont communities were largely influenced by local environmental conditions.

scholarly journals Potential foraging and aggregation zones of the Hawksbill Sea Turtle Eretmochelys imbricata (Testudines: Cheloniidae), near Marino Ballena National Park, Costa Rica

2017 ◽  
Vol 9 (1) ◽  
pp. 171-177
Author(s):  
Adrian Bonilla Salazar ◽  
Oscar Brenes Arias
Keyword(s):  
Costa Rica ◽  
Direct Observation ◽  
National Park ◽  
Sea Turtles ◽  
Sea Turtle ◽  
Sampling Point ◽  
Sample Point ◽  
Eretmochelys Imbricata ◽  
Potential Food ◽  
Size Estimates

Groups of hawksbill sea turtles have been observed over the years, close to the coast of the Marino Ballena National Park. For this reason, in February 2015, we monitored its coast to identify aggregation sites. Turtle size estimates, and identification, were done by direct observation by the divers and from the boat. From February to December 2015, fourteen monitor records per sampling point were done and 41 turtles were recorded. They were 30cm - 80cm long and 59% of the individuals aggregated in one sample point. Five genera of sponges were registered as potential food: Haliclona sp, Spirastrella sp, Mycale sp, Aplyscina sp and Axinella sp and one tunicate, Rhopalaea birkelandi. The E. imbricata population was mainly composed of juveniles, and the turtles were found in zones where they have not been previously reported.

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

PLoS ONE ◽  
2021 ◽  
Vol 16 (7) ◽  
pp. e0253916
Author(s):  
Chelsea E. Clyde-Brockway ◽  
Christina R. Ferreira ◽  
Elizabeth A. Flaherty ◽  
Frank V. Paladino
Keyword(s):  
Sea Turtles ◽  
Multiple Reaction Monitoring ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
Lipid Classes ◽  
Plasma Samples ◽  
Lipid Profiling ◽  
Eretmochelys Imbricata ◽  
Species Specific ◽  
Hawksbill Turtles

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. The relative ion intensities of most lipids (80%) were consistent between species, across seasons, and were not correlated to body size or estimated sex. Of the differences we observed, the most pronounced was the differences in relative ion intensity between species. We identified 123 lipids that had species-specific relative ion intensities. While some of this variability is likely due to green and hawksbill turtles consuming different food items, we found indications of a phylogenetic component as well. Of these, we identified 47 lipids that varied by season, most belonging to the structural phospholipid classes. Overall, more lipids (n = 39) had higher relative ion intensity in the upwelling (colder) season compared to the non-upwelling season (n = 8). Further, we found more variability in hawksbill turtles than green turtles. Here, we provide the framework in which to apply future lipid profiling in the assessment of health, physiology, and behavior in endangered sea turtles.

Plasma biochemistry values in wild female hawksbill turtles (Eretmochelys imbricata), during nesting and foraging seasons in Qeshm Island, Persian Gulf

2014 ◽  
Vol 24 (3) ◽  
pp. 561-566 ◽  
Author(s):  
Maryam Ehsanpour ◽  
Mohammad Reza Ahmadi ◽  
Amir Houshang Bahri ◽  
Majid Afkhami ◽  
Kimberly J. Reich
Keyword(s):  
Persian Gulf ◽  
Plasma Biochemistry ◽  
Wild Female ◽  
Qeshm Island ◽  
Eretmochelys Imbricata ◽  
Hawksbill Turtles

Cytochrome c oxidase subunit 1 barcode data of fish of the Nayband National Park in the Persian Gulf and analysis using meta‐data flag several cryptic species

2011 ◽  
Vol 11 (3) ◽  
pp. 461-472 ◽  
Author(s):  
HOSSEINALI ASGHARIAN ◽  
HOMAYOUN HOSSEINZADEH SAHAFI ◽  
ARIA ASHJA ARDALAN ◽  
SHAHROKH SHEKARRIZ ◽  
ELAHE ELAHI
Keyword(s):  
Cytochrome C ◽  
Cryptic Species ◽  
Cytochrome C Oxidase ◽  
Persian Gulf ◽  
National Park ◽  
Meta Data ◽  
Oxidase Subunit ◽  
The Persian Gulf

scholarly journals mtDNA variation of the critically endangered hawksbill turtle (Eretmochelys imbricata) nesting on Iranian islands of the Persian Gulf

2011 ◽  
Vol 10 (3) ◽  
pp. 1499-1503 ◽  
Author(s):  
M. Tabib ◽  
H. Zolgharnein ◽  
M. Mohammadi ◽  
M.A. Salari-Aliabadi ◽  
A. Qasemi ◽  
...  
Keyword(s):  
Persian Gulf ◽  
Critically Endangered ◽  
Eretmochelys Imbricata ◽  
Mtdna Variation ◽  
The Persian Gulf

scholarly journals Uso de alimentos comerciales en el levante de tortugas carey (Eretmochelys imbricata, Cheloniidae)

2018 ◽  
Vol 47 (2) ◽  
Author(s):  
Ricardo Andrés Sarmiento-Devia ◽  
Guiomar Aminta Jaúregui-Romero ◽  
Adolfo Sanjuan-Muñoz
Keyword(s):  
Growth Rates ◽  
Low Cost ◽  
Sea Turtle ◽  
Eretmochelys Imbricata ◽  
Average Body Mass ◽  
Healthy Growth ◽  
Commercial Feeds ◽  
Nesting Beaches ◽  
Hawksbill Turtles ◽  
Average Body

Headstarting is a recovery strategy for sea turtle populations. It requires captive handling of hatchlings, which are transferred from nesting beaches with low percentages of hatching success. Providing adequate nutritional resources for hatchlings is costly but important, as it influences growth rates of young turtles. Assessing the potential of commercial diets as option for promoting healthy growth and reducing the costs of maintenance for captive Hawksbill Turtles, we evaluated the viability of two commercial feeds on the growth rates of the Hawksbill Turtle (Eretmochelys imbricata). We fed turtles to satiation twice a day between the sixth and tenth month of age. Individuals fed with fish flour meal (n=20) exhibited average body mass and straight carapace length (SCL) growth rates of 2.45±1.39 g.day-1 and 0.04±0.02cm.day-1, respectively. The turtles fed with squid flour meal (n =13) displayed growth rates of 3.35±1.11 g.day-1 and 0.04±0.01 cm.day-1. These differences, associated with the low avidity of the specimens for these pellets, may be due to the food characteristics, particularly the size, flotation capability and palatability of the food. However, the presence of amino acids and vitamins in these compounds, and their low cost, can make them viable as a supplementary item suggesting the use of commercial foods only as a dietary supplement.

scholarly journals Hematology, biochemistry, and toxicology of wild hawksbill turtles (Eretmochelys imbricata) nesting in mangrove estuaries in the eastern Pacific Ocean

2017 ◽  
Author(s):  
Aubrey M. Tauer ◽  
Michael J. Liles ◽  
Sofía Chavarría ◽  
Melissa Valle ◽  
Sada Amaya ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Pacific Ocean ◽  
Organic Pollutants ◽  
Persistent Organic Pollutants ◽  
Sea Turtle ◽  
Eastern Pacific ◽  
Eastern Pacific Ocean ◽  
Eretmochelys Imbricata ◽  
Mangrove Estuary ◽  
Hawksbill Turtles

AbstractSea turtles are a keystone species and are highly sensitive to changes in their environment, making them excellent environmental indicators. In light of environmental and climate changes, species are increasingly threatened by pollution, changes in ocean health, habitat alteration, and plastic ingestion. There may be additional health related threats and understanding these threats is key in directing future management and conservation efforts, particularly for severely reduced sea turtle populations. Hawksbill turtles (Eretmochelys imbricata) are critically endangered, with those in the eastern Pacific Ocean (Mexico–Peru) considered one of the most threatened sea turtle populations in the world. This study establishes baseline health parameters in hematology and blood biochemistry as well as tested for heavy metals and persitent organic pollutants in eastern Pacific hawksbills at a primary nesting colony located in a mangrove estuary. Whereas hematology and biochemistry results are consistent with healthy populations of other species of sea turtles, we identified differences in packed cell volume, heterophils and lympohcyte counts, and glucose when comparing our data to other adult hawksbill analysis (1), (2), (3). Our analysis of heavy metal contamination revealed a mean blood level of 0.245 ppm of arsenic, 0.045 ppm of lead, and 0.008 ppm of mercury. Blood levels of persistent organic pollutants were below the laboratory detection limit for all turtles. Our results suggest that differences in the feeding ecology of eastern Pacific hawksbills in mangrove estuaries may make them less likely to accumulate persistent organic pollutants and heavy metals in their blood. These baseline data on blood values in hawksbills nesting within a mangrove estuary in the eastern Pacific offer important guidance for health assessments of the species in the wild and in clinical rehabilitation facilities, and underscore the importance of preventing contamination from point and non-point sources in mangrove estuaries, which represent primary habitat to hawksbills and myriad other marine species in the eastern Pacific Ocean.

scholarly journals Risk factors in ecosystem of hawksbill turtles (eretmochelys imbricata) from ila playita of machalilla national park

2019 ◽  
Vol 3 (1) ◽  
pp. 31-40
Author(s):  
Yamel Alvarez Gutierrez ◽  
Lady Vazquez Guillen ◽  
Arturo Hernandez Escobar ◽  
Julio Jaramillo Veliz
Keyword(s):  
Risk Factors ◽  
National Park ◽  
Abiotic Factors ◽  
Research Work ◽  
Statistical Processing ◽  
Document Analysis ◽  
Cross Sectional ◽  
Eretmochelys Imbricata ◽  
Observation Methods ◽  
Hawksbill Turtles

The results of research work are presented, which was carried out under a non-experimental, cross-sectional and descriptive design. The objective was to diagnose the presence of risk factors in the habitat of Hawksbill turtles, in the Machalilla National Park. Observation methods, document analysis, induction - deduction and interview techniques were applied to officials of the referred institution. Biotic and abiotic factors were evaluated and the results were subjected to the corresponding statistical processing. It is identified that although in the environmental order the studied habitat collects ideal conditions, factors of biotic origin that threaten the balance of that environment subsists.

Pivotal temperature and predicted sex ratios for hatchling hawksbill turtles from Brazil

1999 ◽  
Vol 77 (9) ◽  
pp. 1465-1473 ◽  
Author(s):  
Matthew H Godfrey ◽  
Adriana F D'Amato ◽  
Maria  Marcovaldi ◽  
N Mrosovsky
Keyword(s):  
Low Temperatures ◽  
Sex Ratios ◽  
Sea Turtle ◽  
Temperature Dependent ◽  
Eretmochelys Imbricata ◽  
Conservation Implications ◽  
Incubation Duration ◽  
Incubation Temperatures ◽  
Hawksbill Turtles ◽  
Pivotal Temperature

Like all other species of sea turtle, the hawksbill turtle (Eretmochelys imbricata) exhibits temperature-dependent sexual differentiation, with high incubation temperatures producing females and low temperatures producing males. Relatively little is known about the sex ratios of hatchlings produced by nesting populations of hawksbill turtles. Here we estimate the overall seasonal sex ratios of hatchling hawksbill turtles produced in Bahia, Brazil, during 6 nesting seasons, based on incubation durations, pivotal temperature, and pivotal incubation duration. The overall sex ratio of hatchlings produced in Bahia from 1991-1992 through 1996-1997 was estimated to be >90% female, which is more female-biased than estimated sex ratios of hatchling loggerhead turtles from Bahia and Florida, U.S.A. The biological and conservation implications of skewed sex ratios are discussed.

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