scholarly journals First record of an immature green turtle Chelonia mydas (Linnaeus, 1758) (Testudines: Cheloniidae) on a fluvial island, Reserva Biológica do Parazinho, Amazonas river, Brazil

Check List ◽  
2013 ◽  
Vol 9 (2) ◽  
pp. 434 ◽  
Author(s):  
Carlos Eduardo Costa Campos ◽  
Rafael Cabral dos Santos ◽  
Ananda Silva Araújo ◽  
Núcia Nayara Guedes Paes
Keyword(s):  
Aquatic Environment ◽  
Green Turtle ◽  
Salt Water ◽  
Marine Species ◽  
Chelonia Mydas ◽  
First Record ◽  
Water Salinity ◽  
Fluvial Island

On March 8th, 2011 we recorded an immature green turtle Chelonia mydas at the Reserva Biológica do Parazinho, eastern Amazonia, Brazil. This record of C. mydas on a fluvial island, where the aquatic environment is a mixture of fresh and salt water, suggests that this typical marine species potentially tolerates lower levels of water salinity.

scholarly journals Hybridization Between a Green Turtle, Chelonia mydas, and Loggerhead Turtle, Caretta caretta, and the First Record of a Green Turtle in Atlantic Canada

2004 ◽  
Vol 118 (4) ◽  
pp. 579 ◽  
Author(s):  
Michael C. James ◽  
Kathleen Martin ◽  
Peter H. Dutton
Keyword(s):  
Coastal Waters ◽  
Green Turtle ◽  
Loggerhead Turtle ◽  
Chelonia Mydas ◽  
Caretta Caretta ◽  
First Record ◽  
Atlantic Canada ◽  
Eastern Canada ◽  
Northwest Atlantic

The Green Turtle (Chelonia mydas) principally occupies tropical and subtropical waters, although juveniles are known to occur seasonally in temperate coastal waters. Collaboration with commercial fishers in eastern Canada yielded the most northerly records of this species in the northwest Atlantic. Here we report on the first confirmed record of a Green Turtle in eastern Canada and on the occurrence of a rare Green Turtle–Loggerhead Turtle (Caretta caretta) hybrid. Hybridization between the Carettini and Chelonini is extraordinary given that these groups have been genetically distinct for 50 million years or more.

scholarly journals Seascape Genetics and the Spatial Ecology of Juvenile Green Turtles

Genes ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 278
Author(s):  
Michael P. Jensen ◽  
Mayeul Dalleau ◽  
Philippe Gaspar ◽  
Maxime Lalire ◽  
Claire Jean ◽  
...  
Keyword(s):  
Green Turtle ◽  
Spatial Ecology ◽  
Conservation Management ◽  
Marine Species ◽  
Chelonia Mydas ◽  
Ocean Currents ◽  
Marine Animals ◽  
Southwest Indian Ocean ◽  
Green Turtles ◽  
Effective Conservation

Understanding how ocean currents impact the distribution and connectivity of marine species, provides vital information for the effective conservation management of migratory marine animals. Here, we used a combination of molecular genetics and ocean drift simulations to investigate the spatial ecology of juvenile green turtle (Chelonia mydas) developmental habitats, and assess the role of ocean currents in driving the dispersal of green turtle hatchlings. We analyzed mitochondrial (mt)DNA sequenced from 358 juvenile green turtles, and from eight developmental areas located throughout the Southwest Indian Ocean (SWIO). A mixed stock analysis (MSA) was applied to estimate the level of connectivity between developmental sites and published genetic data from 38 known genetic stocks. The MSA showed that the juvenile turtles at all sites originated almost exclusively from the three known SWIO stocks, with a clear shift in stock contributions between sites in the South and Central Areas. The results from the genetic analysis could largely be explained by regional current patterns, as shown by the results of passive numerical drift simulations linking breeding sites to developmental areas utilized by juvenile green turtles. Integrating genetic and oceanographic data helps researchers to better understand how marine species interact with ocean currents at different stages of their lifecycle, and provides the scientific basis for effective conservation management.

First Record of Fibropapillomatosis in a Green Turtle Chelonia mydas from the Baja California Peninsula

2016 ◽  
Vol 28 (4) ◽  
pp. 252-257 ◽  
Author(s):  
Eduardo Reséndiz ◽  
Sergio Flores-Ramírez ◽  
Volker Koch ◽  
Amaury Cordero-Tapia
Keyword(s):  
Green Turtle ◽  
Baja California ◽  
Chelonia Mydas ◽  
First Record ◽  
Baja California Peninsula

scholarly journals Determination of acute toxicity of ammonium in juvenile Patagonian blenny (Eleginops maclovinus)

2019 ◽  
Vol 79 (4) ◽  
pp. 646-650
Author(s):  
A. Mardones ◽  
M. González ◽  
C. Rivas-Mancilla ◽  
R. Vega ◽  
A. Augsburger ◽  
...  
Keyword(s):  
Acute Toxicity ◽  
Salt Water ◽  
Marine Species ◽  
First Record ◽  
Control Group ◽  
Ammonium Toxicity ◽  
Eleginops Maclovinus ◽  
Experimental Fish ◽  
Water Ph

Abstract Deionized ammonium (NH3) acute toxicity (LC50-96h) in Patagonian blenny juveniles (Eleginops maclovinus) was assessed. Concentrations of deionized ammonium in salt water were prepared by using 24.09 ± 2.1 g ammonium chloride (NH4Cl). Fish were exposed in triplicates to different ammonium concentrations: 0.05; 0.094; 0.175; 0.325 and 0.605 mg NH3 L-1. Additionally, a control group was included. Experimental fish were kept at a photoperiod of 16:8h. Average temperatures were 16.24 ± 1.40 °C. Oxygen concentration was 7.16 ± 0.40 mg L -1. Water pH was 7.89 ± 0.2. LC50-96 h, was estimated by using Probit statistical method (95% intervals) using EPA software (1993). Juveniles of E. maclovinus showed a LC50-96h of 0.413mg NH3 L-1 value, different from most marine species. This study presents the first record of ammonium toxicity in marine species of Chile.

scholarly journals Colour vision of green turtle (Chelonia mydas) hatchlings: do they still prefer blue under water?

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5572 ◽  
Author(s):  
Rebecca Jehne Hall ◽  
Simon K.A. Robson ◽  
Ellen Ariel
Keyword(s):  
Aquatic Environment ◽  
Green Turtle ◽  
Colour Vision ◽  
Chelonia Mydas ◽  
Spatial Arrangement ◽  
Experimental Tank ◽  
Terrestrial Environment ◽  
Prefer Food ◽  
Green Turtles ◽  
Colour Saturation

Background Several anatomical studies provide evidence that green turtles (Chelonia mydas) possess the necessary anatomy for colour vision. Behavioural experiments have previously been conducted with newly emerged hatchlings, concluding that they are attracted to shorter wavelengths compared to longer wavelengths within a terrestrial environment, suggesting a possible attraction towards blue. This paper assessed the colour vision of hatchlings within an aquatic environment, and investigated whether the attraction for shorter wavelengths remains consistent within water, whether the colour saturation of the chromatic stimuli was an important factor, and whether rearing and testing individual animals in different coloured housing tanks has an impact on their visual choices. Methods Forty-one hatchling green turtles were presented with a three-choice experiment where food was attached to three different coloured plates. The plates (blue, yellow, and red) were randomly arranged in the turtle’s tank and four different colour saturations were tested (100, 75, 50, and 25%). Turtles were individually placed into their housing tanks (coloured either red, white, blue or grey) with three different colour plates in front of them, from the same saturation level. The colour of the plate with food first approached and bitten by the turtle was recorded. Results The colour of the tank in which an individual was reared, and where experiments were conducted, significantly influenced which food item was selected on the different coloured plates. While individual turtles preferred to select the food items associated with blue plates across the entire experiment (66.1% of the time compared to 18.2% and 15.7% for yellow and red plates respectively), the preference for blue plates was influenced by the colour of the rearing/experimental tank. Individuals raised in red, white or blue tanks appeared to consistently prefer food on blue plates, but there appeared to be no plate colour preference by turtles in grey tanks. There was no significant effect of either colour saturation or the spatial arrangement of the three colours within an experimental tank on colour choice, and no significant interaction between tank colour and colour saturation. Discussion Thesefindings confirm that the terrestrial preference towards shorter wavelength colours, such as blue, compared to longer wavelength colours remains consistent within an aquatic environment. This preference for blue continues even as the colour saturation reduces from 100% down to 25%, and the colours become darker. Thus, it is suggested that green turtle hatchlings have a strong attraction towards blue. This attraction, however, is influenced by the colour of the tank the turtles were raised in. While this supports the notion that environmental colour may influence individual turtle visual capabilities, it suggests that this relationship is more complicated, and requires further investigation.

First Record of a Caribbean Green Turtle (Chelonia mydas) Grazing on Invasive Seagrass (Halophila stipulacea)

2014 ◽  
Vol 48 (2-3) ◽  
pp. 162-163 ◽  
Author(s):  
Leontine E. Becking ◽  
Tineke C.J.M. van Bussel ◽  
Adolphe O. Debrot ◽  
Marjolijn J.A. Christianen
Keyword(s):  
Green Turtle ◽  
Chelonia Mydas ◽  
First Record ◽  
Halophila Stipulacea

CONDITIONS OF HILLING HABITAT OF CHELONIA MYDAS (GREEN TURTLE) IN PANGUMBAHAN BEACH UJUNG GENTENG, SUKABUMI SELATAN

2019 ◽  
Vol 1 (02) ◽  
pp. 64-67
Author(s):  
Meilisha Putri Pertiwi ◽  
Suci Siti Lathifah
Keyword(s):  
Data Collection ◽  
Surface Temperature ◽  
Green Turtle ◽  
Data Retrieval ◽  
Distribution Patterns ◽  
Chelonia Mydas ◽  
Nesting Habitat ◽  
Beach Width ◽  
The Many ◽  
Pandanus Tectorius

Research on the condition of the nesting habitat of Chelonia mydas (green turtle) in Pangumbahan Beach, Ujung Genteng, South Sukabumi has been carried out. Data retrieval is done 6 times for 2 days, 27-28 November 2017 at 3 observation stations. The abiotic parameters measured include surface temperature and depth of 50 cm, surface humidity and depth of 50 cm, beach width, beach slope, and the size of sand grains. While the biotic parameters measured were density, relative density, the frequency of attendance, and distribution patterns of Pandanus tectorius (sea pandanus) vegetation. Based on the results of data processing, the biophysical conditions in Pangumbahan Beach are still suitable for the Chelonia mydas nesting habitat. It also got clear evidence of the many Chelonia mydas landings during the data collection.

Structural description of sea turtle fibropapilloma

2020 ◽  
Vol 13 (3) ◽  
pp. 585-591
Author(s):  
Luana Melo ◽  
Isabel Velasco ◽  
Julia Aquino ◽  
Rosangela Rodrigues ◽  
Edris Lopes ◽  
...  
Keyword(s):  
Green Turtle ◽  
Chelonia Mydas ◽  
Sea Turtle ◽  
Tumor Formation ◽  
Neoplastic Disease ◽  
Structural Description ◽  
Chemical Carcinogens ◽  
Epidermal Proliferation ◽  
Turtle Population ◽  
Bulky Mass

Fibropapillomatosis is a neoplastic disease that affects sea turtles. It is characterized by multiple papillomas, fibropapillomas and cutaneous and/or visceral fibromas. Although its etiology has not been fully elucidated, it is known that there is a strong involvement of an alpha - herpesvirus, but the influence of other factors such as parasites, genetics, chemical carcinogens, contaminants, immunosuppression and ultraviolet radiation may be important in the disease, being pointed out as one of the main causes of a reduction in the green turtle population. Thus, the objective of this article was to describe the morphology of cutaneous fibropapillomas found in specimens of the green turtle (Chelonia mydas), using light and scanning electron microscopy in order to contribute to the mechanism of tumor formation. Microscopically, it presented hyperplastic stromal proliferation and epidermal proliferation with hyperkeratosis. The bulky mass was coated with keratin, with some keratinocyte invaginations, that allowed the keratin to infiltrate from the epidermis into the dermis, forming large keratinized circular spirals. Another fact that we observed was the influence of the inflammation of the tumors caused by ectoparasites.

Discovery of a Major East Pacific Green Turtle (Chelonia mydas) Nesting Population in Northwest Costa Rica

2018 ◽  
Vol 17 (2) ◽  
pp. 169
Author(s):  
Luis G. Fonseca ◽  
Pilar Santidrián Tomillo ◽  
Wilbert N. Villachica ◽  
Wagner M. Quirós ◽  
Marta Pesquero ◽  
...  
Keyword(s):  
Costa Rica ◽  
Green Turtle ◽  
Chelonia Mydas ◽  
East Pacific
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