Assessing the Impacts of Human Activities on Nesting of Loggerhead Sea-turtles (Caretta caretta L.) on Zákynthos Island, Western Greece

The island of Zákynthos, in western Greece, supports the most important nesting biotope of the endangered Loggerhead Sea-turtle (Caretta caretta) within Europe. The evaluation of the impacts of human activities, such as beach-use by people, lights, noise, and traffic, on its nesting habitats revealed that they are running out of time under the pressure of rapid and massive tourist development. It is therefore essential for the protection of this unique species to conserve its nesting biotope. This implies adequate, ecologically sound management, which might well be ensured through the establishment of a Marine Park.

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Intraerythrocytic inclusion bodies in the loggerhead sea turtle Caretta caretta from Madeira

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315400003015 ◽

2000 ◽

Vol 80 (5) ◽

pp. 957-958 ◽

Cited By ~ 3

Author(s):

J.C. Eiras ◽

T. Dellinger ◽

A.J. Davies ◽

G. Costa ◽

A.P. Alves de Matos

Keyword(s):

Red Blood Cells ◽

Blood Cells ◽

Inclusion Bodies ◽

Sea Turtles ◽

Caretta Caretta ◽

Sea Turtle ◽

Loggerhead Sea Turtles ◽

Loggerhead Sea Turtle ◽

Intracytoplasmic Inclusion ◽

Intracytoplasmic Inclusion Bodies

Intracytoplasmic inclusion bodies were detected in the mature red blood cells of twenty juvenile loggerhead sea turtles, Caretta caretta, captured in Madeira. The bodies were mostly single, round to oval, frequently irregular in outline, and their diameter varied from 0.5 to 2.0 μm. Most bodies were associated with small granular areas, often in the form of a tail or projection. In some cells, only granular areas were apparent. The nuclei of most erythrocytes were irregular in outline but degeneration of red blood cells was not observed. The identity of these intraerythrocytic structures is not clear but they may be viral or rickettsial in nature.

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First record of loggerhead sea turtles Caretta caretta in Sebastián Vizcaíno Bay, Baja California Peninsula, Mexico

Latin American Journal of Aquatic Research ◽

10.3856/vol48-issue1-fulltext-2328 ◽

2020 ◽

Vol 48 (1) ◽

pp. 146-149

Author(s):

Helena Fernández-Sanz ◽

Fabián Castillo Romero ◽

Joaquín Rivera Rodríguez ◽

Noé López Paz ◽

Gabriel Arturo Zaragoza Aguilar ◽

...

Keyword(s):

Baja California ◽

Sea Turtles ◽

Chelonia Mydas ◽

Caretta Caretta ◽

First Record ◽

Sea Turtle ◽

Baja California Peninsula ◽

Loggerhead Sea Turtles ◽

Biometric Data ◽

Loggerhead Sea Turtle

The loggerhead sea turtle (Caretta caretta) is an endangered species which distributes around the west coast of the Baja California Peninsula. In Baja California Sur, the conservation efforts for this species were focused in the Gulf of Ulloa; however, within the Pacific coast of the Baja California Peninsula, Sebastián Vizcaíno Bay (SVB) biological active center suit the optimal conditions for the presence of loggerheads. This study aimed to investigate SVB as a potential foraging area for loggerheads. Between July and August 2018, three prospective surveys were conducted, in search of marine turtles in SVB. A total of three loggerhead turtles and one eastern Pacific green turtle (Chelonia mydas) were captured; biometric data were recorded, and organisms were classified as juveniles. This is the first report of the loggerhead sea turtles in the SVB and given the oceanographic characteristics of the bay, it is a potential foraging and development area for the species.

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Helminth Infection of the Loggerhead Sea Turtle Caretta caretta along the Coasts of Sicily and the North West Adriatic Sea

Animals ◽

10.3390/ani11051408 ◽

2021 ◽

Vol 11 (5) ◽

pp. 1408

Author(s):

Antonino Gentile ◽

Tullia Amato ◽

Andrea Gustinelli ◽

Maria Letizia Fioravanti ◽

Delia Gambino ◽

...

Keyword(s):

Adriatic Sea ◽

Sea Turtles ◽

Single Species ◽

Caretta Caretta ◽

Sea Turtle ◽

Helminth Parasites ◽

Loggerhead Sea Turtles ◽

Loggerhead Sea Turtle ◽

North West ◽

The North

We provide new data on the presence of helminth parasites in 64 individual loggerhead sea turtles Caretta caretta stranded along the coasts of Sicily and the northwest Adriatic Sea between June 2014 and August 2016. The necropsy examination revealed 31 individuals (48.4%) positive for endoparasites, showing a greater prevalence of trematodes than nematodes. In particular, seven species and a single genus of Trematoda (Hapalotrema) and a single species and genus of Nematoda (Kathlania) were identified. Among the Digenea flukes the species with the highest prevalence of infection were Rhytidodes gelatinosus (34.6%) and Hapalotrema sp. (33.3%), while among the Nematoda they were Kathlania sp. (33.3%) and Sulcascaris sulcata (33.3%). Analysis of variance (ANOVA) was applied among the recovery sites of the stranded loggerhead sea turtles and prevalence of endoparasites was used to highlight any relationship between the parasites and the origin of the hosts. ANOVA showed significant differences (p < 0.001) among the data used.

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The widely occurring brittlestar Ophiactis savignyi (Amphilepidida: Ophiactidae) as an epibiont on loggerhead sea turtle, Caretta caretta

Zootaxa ◽

10.11646/zootaxa.4695.5.7 ◽

2019 ◽

Vol 4695 (5) ◽

pp. 497-500

Author(s):

RYOTA HAYASHI ◽

MASANORI OKANISHI

Keyword(s):

New Species ◽

Sea Turtles ◽

Caretta Caretta ◽

Sea Turtle ◽

The Novel ◽

Loggerhead Sea Turtles ◽

Loggerhead Sea Turtle ◽

First Occurrence

We describe the first occurrence of the widely occurring brittlestar Ophiactis savignyi (Müller & Troschel, 1842) as epibionts on Caretta caretta (Linnaeus, 1758), the loggerhead sea turtles. On the sea turtle epibionts, the coronulid barnacles were well studied as listed in Hayashi (2013), and recently some crustaceans were collected from loggerhead sea turtles and described as new species (Tanabe et al. 2017; Tanaka and Hayashi 2019). In contrast, echinoderm epibionts listed from sea turtles are poorly understood (Table 1) and this study represents the novel discovery of an ophiuroid, which was not previously known to occur on the surface of this species.

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Record of the Loggerhead Sea Turtle, Caretta caretta (Testudines, Cheloniidae), in the Black Sea with the Review of the Species Occurrence in the Region

Zoodiversity ◽

10.15407/zoo2021.02.127 ◽

2021 ◽

Vol 55 (2) ◽

pp. 127-132

Author(s):

O. Zinenko ◽

K. A. Vishnyakova ◽

L. Stoyanov ◽

P. E. Gol’din

Keyword(s):

Black Sea ◽

Sea Turtles ◽

Caretta Caretta ◽

First Record ◽

Sea Turtle ◽

The Black Sea ◽

Loggerhead Sea Turtles ◽

Loggerhead Sea Turtle ◽

The North ◽

North Western

A rare live record of the loggerhead sea turtle Caretta caretta (Linnaeus, 1758) is reported from the Dzharylgach Gulf in the north-western Black Sea. This is the first record from Ukrainian waters since 1962 and the northernmost record of the species in the Black Sea. The loggerhead sea turtles of the east Mediterranean origin are increasingly often seen in the Marmara and the Black Sea during the latest decade, which is an evidence for potential expansion of this species range, at least partly due to climate changes. Key words: sea turtles, Caretta caretta, Black Sea, Ukraine, range expansion.

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Nesting Patterns of Loggerhead Sea Turtles (Caretta caretta): Development of a Multiple Regression Model Tested in North Carolina, USA

ISPRS International Journal of Geo-Information ◽

10.3390/ijgi7090348 ◽

2018 ◽

Vol 7 (9) ◽

pp. 348 ◽

Cited By ~ 2

Author(s):

Joanne Halls ◽

Alyssa Randall

Keyword(s):

North Carolina ◽

Negative Binomial ◽

Management Strategies ◽

Temporal Trends ◽

Caretta Caretta ◽

Sea Turtle ◽

Multiple Regression Model ◽

Loggerhead Sea Turtles ◽

Loggerhead Sea Turtle ◽

Nesting Patterns

Numerous environmental conditions may influence when a female Loggerhead sea turtle (Caretta caretta) selects a nesting site. Limited research has used Geographic Information Systems (GIS) and statistical analysis to study sea turtle spatial patterns and temporal trends. Therefore, the goals of this research were to identify areas that were most prevalent for nesting and to test social and environmental variables to create a nesting suitability predictive model. Data were analyzed at all barrier island beaches in North Carolina, USA (515 km) and several variables were statistically significant: distance to hardened structures, beach nourishment, house density, distance to inlets, and beach elevation, slope, and width. Interestingly, variables that were not significant were population density, proximity to the Gulf Stream, and beach aspect. Several statistical techniques were tested and Negative Binomial Distribution produced good regional results while Geographically Weighted Regression models successfully predicted the number of nests with an average of 75% of the variance explained. Therefore, the combination of traditional and spatial statistics provided insightful predictive modeling results that may be incorporated into management strategies and may have important implications for the designation of critical Loggerhead nesting habitats.

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Magnetic orientation by hatchling loggerhead sea turtles (Caretta caretta)

Journal of Experimental Biology ◽

10.1242/jeb.155.1.37 ◽

1991 ◽

Vol 155 (1) ◽

pp. 37-49 ◽

Cited By ~ 10

Author(s):

K. J. Lohmann

Keyword(s):

Magnetic Field ◽

Laboratory Experiments ◽

Caretta Caretta ◽

Sea Turtle ◽

Magnetic Orientation ◽

Complete Darkness ◽

Loggerhead Sea Turtles ◽

Loggerhead Sea Turtle ◽

The Earth ◽

The Magnetic Field

Laboratory experiments were conducted to test the ability of loggerhead sea turtle hatchlings (Caretta caretta L.) to orient using the magnetic field of the earth. Hatchlings were tethered to a rotatable lever-arm apparatus which tracked swimming orientation in complete darkness. Hatchlings tested in the earth's magnetic field were nonrandomly oriented with a mean angle of 42 degrees; those tested under an earth-strength field with a reversed horizontal component were also nonrandomly oriented, but with a mean angle of 196 degrees. The distributions under the two magnetic field conditions were significantly different, indicating that loggerhead sea turtle hatchlings can detect the magnetic field of the earth and use it as a cue in orientation.

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Anatomic Interactive Atlas of the Loggerhead Sea Turtle (Caretta caretta) Head

Animals ◽

10.3390/ani11010198 ◽

2021 ◽

Vol 11 (1) ◽

pp. 198

Author(s):

Alberto Arencibia ◽

Aday Melián ◽

Jorge Orós

Keyword(s):

Computed Tomography ◽

Soft Tissue ◽

Sea Turtles ◽

Caretta Caretta ◽

Sea Turtle ◽

Two Dimensional ◽

Loggerhead Sea Turtles ◽

Loggerhead Sea Turtle ◽

Unity 3D ◽

Image Assessment

The head of the sea turtle is susceptible to congenital, developmental, traumatic, and infectious disorders. An accurate interpretation and thorough understanding of the anatomy of this region could be useful for veterinary practice on sea turtles. The purpose of this study was to develop an interactive two-dimensional (2D) atlas viewing software of the head of the loggerhead sea turtle (Caretta caretta) using images obtained via osteology, gross dissections, and computed tomography (CT). The atlas is composed of 10 osteology, 13 gross dissection, 10 sagittal multiplanar reconstructed CT (bone and soft tissue kernels), and 22 transverse CT (bone and soft tissue windows) images. All images were segmented and colored using ITK-SNAP software. The visualization and image assessment were performed using the Unity 3D platform to facilitate the development of interactive content in 2D. This atlas can be useful as an interactive anatomic resource for assessment of the head of loggerhead sea turtles.

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