The distribution of failed eggs and the appearance of fungi in artificial nests of green (Chelonia mydas) and loggerhead (Caretta caretta) sea turtles

2001 ◽  
Vol 49 (6) ◽  
pp. 713 ◽  
Author(s):  
Andrea D. Phillott ◽  
C. John Parmenter
Keyword(s):  
Chelonia Mydas ◽  
Caretta Caretta ◽  
Sea Turtle ◽  
Egg Mass ◽  
Nutrient Source ◽  
Pseudallescheria Boydii ◽  
Artificial Nests ◽  
Eastern Australia ◽  
Hatch Success ◽  
Artificial Incubation

Fungi are often found on the exterior of unhatched eggs in sea turtle nests in eastern Australia. Artificial incubation of green (Chelonia mydas) and loggerhead (Caretta caretta) turtle eggs allowed the radiation of fungi to be monitored. Fortuitous egg mortality provided a nutrient source for common soil mycobiota (Fusarium solani and Pseudallescheria boydii) and served as a focus for the progressive spread of fungal hyphae to adjacent viable eggs. In extreme cases the entire egg mass was enveloped and resulted in nil hatch success.

The ultrastructure of sea turtle eggshell does not contribute to interspecies variation in fungal invasion of the egg

2006 ◽  
Vol 84 (9) ◽  
pp. 1339-1344 ◽  
Author(s):  
A.D. Phillott ◽  
C.J. Parmenter
Keyword(s):  
Chelonia Mydas ◽  
Interspecific Variation ◽  
Sea Turtle ◽  
Direct Access ◽  
Eretmochelys Imbricata ◽  
Loggerhead Sea Turtle ◽  
Fungal Invasion ◽  
Eastern Australia ◽  
Fungal Hyphae ◽  
Natator Depressus

The eggshells of green ( Chelonia mydas (L., 1758)), loggerhead (Caretta caretta (L., 1758)), hawksbill ( Eretmochelys imbricata (L., 1766)), and flatback ( Natator depressus (Garman, 1880)) sea turtles nesting in eastern Australia were examined by scanning electron microscopy to determine if the ultrastructure was contributing to interspecific variation in fungal invasion of eggs. The eggshells of all species investigated were of similar structure (outer inorganic layer of aragonite crystals and an inner organic fibrillar layer) and of similar thickness. Well-defined pores that would allow direct entry of fungal hyphae or spores were not present in any species. It was concluded that the eggshell ultrastructure does not allow direct access by fungal hyphae or spores and does not contribute to interspecific variation in the vulnerability of loggerhead sea turtle eggs to fungal infection.

scholarly journals Loggerhead turtle, Caretta caretta (Linnaeus, 1758) (Testudines, Cheloniidae), as a new host of Monticellius indicum Mehra, 1939 (Digenea: Spirorchiidae) and associated lesiond to spirorchiid eggs

2017 ◽  
Vol 54 (4) ◽  
pp. 363-368 ◽  
Author(s):  
M. R. Werneck ◽  
C. Nunes ◽  
H. Jerdy ◽  
E. C. Q. Carvalho
Keyword(s):  
Present Note ◽  
Endocrine System ◽  
Loggerhead Turtle ◽  
Chelonia Mydas ◽  
Caretta Caretta ◽  
Sea Turtle ◽  
Pathological Changes ◽  
New Host ◽  
Eretmochelys Imbricata

SummaryThe present note describes the occurrence of Monticellius indicum Mehra, 1939 (Digenea: Spirorchiidae) in an adult loggerhead turtle, Caretta caretta (Linnaeus, 1758), found on the coast of the state of Rio de Janeiro, Brazil. Pathological changes due to spirorchiid eggs (type 1 and 3) were found in gastrointestinal system, endocrine system, and heart. This parasite has previously been described in the green turtle, Chelonia mydas (Linnaeus, 1758), from Pakistan, Brazil and Costa Rica as well as in the hawksbill sea turtle, Eretmochelys imbricata (Linnaeus, 1766), in Brazil. This note reports the loggerhead turtle as a new host for M. indicum.

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

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.

scholarly journals Ocular ultrasonography of sea turtles

2020 ◽  
Vol 62 (1) ◽  
Author(s):  
Caterina Muramoto ◽  
Vinícius Cardoso-Brito ◽  
Ana Cláudia Raposo ◽  
Thais Torres Pires ◽  
Arianne Pontes Oriá
Keyword(s):  
Anterior Chamber ◽  
Environmental Changes ◽  
Sea Turtles ◽  
Corneal Thickness ◽  
Anterior Chamber Depth ◽  
Chelonia Mydas ◽  
Caretta Caretta ◽  
Sea Turtle ◽  
Olive Ridley ◽  
Turtle Species

Abstract Background Environmental changes contribute to the development of ophthalmic diseases in sea turtles, but information on their eye biometrics is scarce. The aim of this study was to describe ophthalmic ultrasonographic features of four different sea turtle species; Caretta caretta (Loggerhead turtle; n = 10), Chelonia mydas (Green turtle; n = 8), Eretmochelys imbricata (Hawksbill turtle; n = 8) and Lepidochelys olivacea (Olive ridley; n = 6) under human care. Corneal thickness, scleral ossicle width and thickness, anterior chamber depth, axial length of the lens, vitreous chamber depth and axial globe length were measured by B-mode sonography with a linear transducer. Carapace size and animal weight were recorded. A sonographic description of the eye structures was established. Results The four species presented an ovate eyeball, a relatively thin cornea, and a small-sized lens positioned rostrally in the eye bulb, near the cornea, resulting in a shallow anterior chamber. The scleral ossicles did not prevent the evaluation of intraocular structures, even with a rotated eye or closed eyelids; image formation beyond the ossicles and measurements of all proposed structures were possible. B-mode sonography was easily performed in all animals studied. The sonographic characteristics of the eye were similar among the four species. Since there was a correlation between the size of the eye structures and the size of the individual, especially its carapace size, the differences found between E. imbricata and Caretta caretta are believed to be due to their overall difference in size. Conclusions Sonography is a valuable tool in ophthalmic evaluation of these species. Only minor differences were found between the species in this study, reinforcing their phylogenetic proximity and their similar functions and habitats.

Novel insights into green sea turtle behaviour using animal-borne video cameras

2002 ◽  
Vol 82 (6) ◽  
pp. 1049-1050 ◽  
Author(s):  
Michael R. Heithaus ◽  
Justin J. McLash ◽  
Alejandro Frid ◽  
Lawrence M. Dill ◽  
Greg J. Marshall
Keyword(s):  
Western Australia ◽  
Chelonia Mydas ◽  
Caretta Caretta ◽  
Video Camera ◽  
Sea Turtle ◽  
Data Logger ◽  
Green Sea Turtle ◽  
Video Cameras ◽  
Green Turtles ◽  
Cleaning Behaviour

An animal-borne video camera and data-logger was used to collect behavioural data on green (Chelonia mydas) and loggerhead (Caretta caretta) turtles in Western Australia. This technique provided novel insights into the behaviour of green turtles including an apparent self-cleaning behaviour. Also, ctenophores and jellyfish might be more important in the diet of these turtles than previously thought.

Larvae of two signal fly species (Diptera:Platystomatidae), Duomyia foliata McAlpine and Plagiostenopterina enderleini Hendel, are scavengers of sea turtle eggs

2006 ◽  
Vol 54 (4) ◽  
pp. 245 ◽  
Author(s):  
Sabrina C. B. Hall ◽  
C. John Parmenter
Keyword(s):  
Chelonia Mydas ◽  
Caretta Caretta ◽  
Sea Turtle ◽  
Nest Material ◽  
Emergence Success ◽  
Collection Record ◽  
Low Prevalence ◽  
Dipteran Species ◽  
Larval Species

Dipteran larvae are known to infest turtle eggs. However, the few studies conducted on this topic have presented conflicting conclusions as to whether the larvae function as scavengers of necrotic nest material or as egg and hatchling predators. These two very different roles in the nest will have equally different effects on the subsequent hatch and emergence success of affected sea turtle nests. The association between dipteran larvae and sea turtle nest invasion was investigated by measuring rates of infestation in excavated green (Chelonia mydas) and loggerhead (Caretta caretta) sea turtle nests at field sites in central Queensland, Australia. Excavations were performed within 24 h of hatchling emergence, and necrotic embryos and dead hatchlings were found to be infested with two larval species of the Platystomatidae: Plagiostenopterina enderleini and Duomyia foliata. This work represents the first description of the association between these dipteran species and sea turtle nests, and a new geographic collection record for D. foliata. High rookery infestation rates versus low prevalence of propagule infestation suggest that the larvae preferentially infest dead embryos. The fact that some pipped hatchlings were devoured in-shell presents the possibility that the larvae may act opportunistically as predators. However, the two dipteran species appear to be primarily scavengers of necrotic material within the nests, which means that the threat to sea turtle populations from these flies is probably minimal.

Dipteran infestation of loggerhead (Caretta caretta) and green (Chelonia mydas) sea turtle nests in northern Cyprus

2001 ◽  
Vol 35 (4) ◽  
pp. 573-581 ◽  
Author(s):  
A. McGowan ◽  
A. C. Broderick ◽  
J. Deeming ◽  
B. J. Godley ◽  
E. G. Hancock
Keyword(s):  
Chelonia Mydas ◽  
Caretta Caretta ◽  
Sea Turtle ◽  
Northern Cyprus
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