scholarly journals Effectiveness of monitoring techniques employed to determine reproductive success of marine turtles in Cuba

2017 ◽  
Vol 43 (3) ◽  
pp. 548-556
Author(s):  
Julia Azanza-Ricardo ◽  
José Luis Gerhartz-Muro ◽  
Yanet Forneiro Martín-Viaña ◽  
Félix Moncada-Gavilán
Keyword(s):  
Cost Benefit ◽  
Chelonia Mydas ◽  
Eretmochelys Imbricata ◽  
Marine Turtles ◽  
Systematic Monitoring ◽  
Monitoring Frequency ◽  
Monitoring Strategies ◽  
Monitoring Effort ◽  
The Right ◽  
Nesting Beaches

Monitoring of nesting has been used globally to estimate the population size of marine turtles. Nevertheless, monitoring effort varies widely, for instance in Cuba, four different approaches are applied: nighttime systematic monitoring, daytime systematic monitoring, sporadic monitoring with nest verification, and sporadic monitoring with no verification. These variations imply that the amount and accuracy of data gathered and the quality of derived information, differ amongst the approaches. This paper assesses the effectiveness of the different methodologies used for determining the reproduction success of marine turtles in Cuba. Nighttime systematic monitoring is only carried out in one area, while sporadic monitoring with nest verification is the most used approach along the country. The proportion of the nesting season covered with monitoring personnel is low in most of the beaches and for all the three species (Chelonia mydas, Caretta caretta and Eretmochelys imbricata), although the species in the most critical situation is hawksbill. Significant differences were found between systematic and sporadic monitoring, which has important implications for the understanding of the nesting behavior, as the capacity to detect false and true crawls essentially depends on the monitoring frequency, according to our findings. Low detection capacity in sporadic monitoring hampered the development of efficiency assessments in all the nesting beaches. In summary, despite the effort carried out nationwide to monitor nesting populations that has even increased in the last three years, important gaps exists and new monitoring strategies are needed to guarantee the right information for the species is gathered, while adequate cost-benefit balance is achieved.

scholarly journals OBSERVACIONES SOBRE LA ANIDACION DE TORTUGAS MARINAS EN LOS ROQUES (VENEZUELA) Y EVALUACION DE MEDIDAS PARA SU PROTECCION

2016 ◽  
Vol 17 ◽  
Author(s):  
Joaquín Buitrago B.
Keyword(s):  
Hatching Success ◽  
Chelonia Mydas ◽  
Hatching Rate ◽  
Eretmochelys Imbricata ◽  
Marine Turtles ◽  
Turtle Conservation ◽  
The Caribbean ◽  
Mortality Causes ◽  
Nesting Beaches ◽  
Hatching Rates

The nesting beaches and seasons of three species of marine turtles Chelonia mydas, Caretta caretta y Eretmochelys imbricata at Los Roques (Venezuela) were studied. E. imbricata was the most common, while C. mydas and C. caretta were rare. The data about the position of the nest on the beach, clutch size and hatching rate were examined. Five methods for the protection of nests against egg collectors were used camouflage, incubation in boxes from three different development times, and moving the eggs to a protected beach. The hatching success and mortality causes in each method are evaluated, finding that it is possible to move the eggs after 35 days of incubation with good hatching rates. The possibilities of these methods for turtle conservation programs at Los Roques and the Caribbean in general are discused.

scholarly journals Two hundred years after a commercial marine turtle fishery: the current status of marine turtles nesting in the Cayman Islands

Oryx ◽  
2001 ◽  
Vol 35 (2) ◽  
pp. 145-151 ◽  
Author(s):  
Jonathan J. Aiken ◽  
Brendan J. Godley ◽  
Annette C. Broderick ◽  
Timothy Austin ◽  
Gina Ebanks-Petrie ◽  
...  
Keyword(s):  
Chelonia Mydas ◽  
Marine Turtle ◽  
Current Status ◽  
Cayman Islands ◽  
Eretmochelys Imbricata ◽  
Marine Turtles ◽  
Mature Adults ◽  
Large Populations ◽  
Sexually Mature ◽  
Insight Into

AbstractLarge populations of marine turtles breeding in the Cayman Islands were drastically reduced in the early 1800s. However, marine turtle nesting still occurs in the islands. The present-day status of this nesting population provides insight into the conservation of marine turtles, a long-lived species. In 1998 and 1999, the first systematic survey of marine turtle nesting in the Cayman Islands found 38 nests on 22 beaches scattered through the three islands. Three species were found: the green Chelonia mydas, hawksbill Eretmochelys imbricata and loggerhead Caretta caretta turtles. Comparison with other rookeries suggests that the small number of sexually mature adults surviving Cayman's huge perturbations may be impeding population recovery. This shows the need to implement conservation measures prior to massive reductions in population size.

Ocular dimensions and schematic eyes of freshwater and sea turtles

1991 ◽  
Vol 7 (6) ◽  
pp. 627-635 ◽  
Author(s):  
D. P. M. Northmore ◽  
A. M. Granda
Keyword(s):  
Refractive Error ◽  
Sea Turtles ◽  
Chelonia Mydas ◽  
Freshwater Turtle ◽  
Eretmochelys Imbricata ◽  
Marine Turtles ◽  
Pseudemys Scripta

AbstractMeasurements were made of the ocular dimensions from living and frozen eyes of one species of freshwater turtle, Pseudemys scripta elegans, and of three species of marine turtles, Chelonia mydas, Dermochelys cariacea, and Eretmochelys imbricata. Estimates of refractive error by retinoscopy were also obtained with eyes in air and under water. The results suggest that unaccommodated eyes of all four species are approximately emmetropic in air but strongly hyperopic in water. Schematic eyes were calculated for each species in both air and water.

Paramphistomes (Digenea; Paramphistomidae) Parasitic in Marine Turtles (Reptilia: Chelonia).

1983 ◽  
Vol 31 (5) ◽  
pp. 851 ◽  
Author(s):  
D Blair
Keyword(s):  
Green Turtle ◽  
Sea Turtles ◽  
Chelonia Mydas ◽  
Original Material ◽  
Eretmochelys Imbricata ◽  
Marine Turtles ◽  
Australian Region ◽  
Species Inquirenda ◽  
Australian Specimen

Schizamphistomum scleroporum (Creplin, 1844) Groschaft, Otero & Tenora, 1977 nec Looss, 1912, and S. erratum, sp. nov. [=S. scleroporum sensu Looss, 1912 (nec Creplin, 1844)], are described from the green turtle, Chelonia mydas (L.), from Australia. One specimen of the former species was also recovered from an Australian specimen of the hawksbill turtle, Eretmochelys imbricata (L.). Paramphistomum papillostomum MacCallum, 1916 and Schizamphistomoides chelonei Gupta, 1961, are regarded as synonyms of Schizamphistomum scleroporum (Creplin). S. taiwanense Fischthal & Kunz, 1975 is regarded as a species inquirenda. The remaining species known from sea turtles, Schizamphistomoides spinulosum (Looss, 1901) Stunkard, 1925, is redescribed, mostly from original material collected by Looss. This species has not yet been found in the Australian region. The relationships between Schizamphistomum scleroporum, S. erratum and Schizamphntomoides spinulosum are discussed.

scholarly journals Saqueo y depredación de nidadas de tortugas marinas, durante las temporadas 2003 a 2012, en seis playas del Golfo de Paria, Venezuela

1969 ◽  
Vol 6 (2) ◽  
pp. 239-244
Author(s):  
Clemente Balladares ◽  
Eva Dubois
Keyword(s):  
Chelonia Mydas ◽  
Sea Turtle ◽  
Dermochelys Coriacea ◽  
Eretmochelys Imbricata ◽  
Marine Turtles ◽  
Team Activity ◽  
The Common ◽  
Cerdocyon Thous

Poaching and predation of sea turtle clutches, during the 2003 and 2012 seasons, on six beaches of the Paria Gulf in Venezuela. Looting and predation of nests are among the major threats to marine turtles. Six beaches of Paria Gulf, northeastern Venezuela, have been protected and had a reduction of clutch poaching and predation on leatherback (Dermochelys coriacea), green (Chelonia mydas), and hawksbill (Eretmochelys imbricata) turtles. During ten years (2003-2012) of nesting seasons (March through October) the six beaches were observed for nesting, poaching and predation. The most frequent losses are caused by poaching, followed by the common fox (Cerdocyon thous), opossum (Didelphis marsupialis) and tamandua (Tamandua tetradactila). The most poached beach is Silvano, followed by Los Garzos (main nesting beach at the site) and Cerezo, which is more distant from the conservation team activity.

scholarly journals The distribution and conservation status of marine turtles in The Gambia, West Africa: a first assessment

Oryx ◽  
2004 ◽  
Vol 38 (2) ◽  
pp. 203-208 ◽  
Author(s):  
Linda K. Barnett ◽  
Craig Emms ◽  
Alpha Jallow ◽  
Anna Mbenga Cham ◽  
Jeanne A. Mortimer
Keyword(s):  
Conservation Status ◽  
Chelonia Mydas ◽  
The Gambia ◽  
Dermochelys Coriacea ◽  
Olive Ridley ◽  
Leatherback Turtles ◽  
Eretmochelys Imbricata ◽  
Lepidochelys Olivacea ◽  
Marine Turtles ◽  
Green Turtles

This paper reports the first systematic survey of the marine turtles of the 80 km of Gambian coastline, and brings together new data and all past records and reports of marine turtles in The Gambia. Green turtles Chelonia mydas are the most abundant turtles and this is the only species so far observed nesting in The Gambia, with peak nesting between August and October. Although 75% (60 km) of The Gambian coastline appears to be suitable for turtle nesting, most nesting activity is confined to the southern coastline. Offshore foraging habitat is apparently extensive. Strandings of green turtles, olive ridley turtles Lepidochelys olivacea, leatherback turtles Dermochelys coriacea and hawksbill turtles Eretmochelys imbricata have been recorded, but we were unable to find evidence for loggerhead turtles Caretta caretta. Threats are mainly of human origin, and include illegal harvesting of eggs, juveniles and adults, as well as mortality as fisheries bycatch, including trawling. One stranded green turtle apparently had fibropapilloma disease. The major threat to nesting habitats is erosion and unregulated development of the coast for tourism. Marine turtles are fully protected under Gambian law. Other national efforts to conserve turtles in The Gambia are described and assessed.

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

2021 ◽  
Vol 8 (2) ◽  
Author(s):  
Caroline Solazzo ◽  
Jean Soulat ◽  
Timothy Cleland
Keyword(s):  
De Novo ◽  
Variable Region ◽  
Chelonia Mydas ◽  
Eretmochelys Imbricata ◽  
Lepidochelys Olivacea ◽  
Marine Turtles ◽  
C Terminus ◽  
Peptide Database ◽  
Nano Liquid Chromatography ◽  
Beta Proteins

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 Eretmochelys imbricata . 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. There are, however, few CBP sequences of marine turtles in protein databases. The scutes of the five main species of marine turtles ( Chelonia mydas , Caretta caretta, Eretmochelys imbricata , Lepidochelys olivacea and Lepidochelys kempii ) were analysed by proteomics, using nano-liquid chromatography-Orbitrap-mass spectrometry to generate peptidic markers for species identification. A total of 187 marker sequences were identified, the large majority of them obtained from automated de novo sequencing. The sequences were classified into peptides A to F: A to D at the N-terminus and central region that forms the β-pleated sheets, E1–4 for a variable region of glycine-repeats region and F at the C-terminus. The markers were tested against a set of combs discovered in various archaeological sites of modern period in France, successfully identifying hawksbill turtle and highlighting patterns of degradation in archaeological tortoiseshell.

scholarly journals The importance of north-west Madagascar for marine turtle conservation

Oryx ◽  
2007 ◽  
Vol 41 (2) ◽  
pp. 232-238 ◽  
Author(s):  
Jessica Metcalf ◽  
Katie Hampson ◽  
Alain Andriamizava ◽  
Rivo Andrianirina ◽  
Claudine Ramiarisoa ◽  
...  
Keyword(s):  
Environmental Education ◽  
Chelonia Mydas ◽  
Marine Turtle ◽  
Conservation Priority ◽  
Eretmochelys Imbricata ◽  
North West ◽  
Marine Turtles ◽  
Incidental Capture ◽  
Turtle Conservation ◽  
Nesting Activity

AbstractThe coast of north-west Madagascar is an important nesting and feeding ground for marine turtles, but little is known about populations in this area. From July to December 2000 we documented nesting activity of, and investigated threats to, green Chelonia mydas and hawksbill Eretmochelys imbricata turtles at three sites along this coast: Nosy Iranja, the Radama Islands, and the Nosy Hara archipelago. Levels of nesting activity varied between sites, with green and hawksbill turtle nesting concentrated in different areas. The principal threats identified were opportunistic exploitation of nesting females and incidental capture in fishing nets. Commercial importance of marine turtles was negligible, suggesting conservation measures such as targeted environmental education could have beneficial impacts on these populations. Evidence for high levels of nesting activity reported here indicate that education efforts in these areas should be a conservation priority.

scholarly journals Turtle riders: remoras on marine turtles in Southwest Atlantic

2006 ◽  
Vol 4 (1) ◽  
pp. 123-126 ◽  
Author(s):  
Ivan Sazima ◽  
Alice Grossman
Keyword(s):  
Chelonia Mydas ◽  
Oceanic Islands ◽  
Dermochelys Coriacea ◽  
Southwest Atlantic ◽  
Eretmochelys Imbricata ◽  
Turtle Species ◽  
Symbiotic Associations ◽  
Marine Turtles ◽  
Open Sea ◽  
Sw Atlantic

An overview is presented for a poorly documented relationship between reef vertebrates in Southwest Atlantic: remoras (Echeneidae) associated with marine turtles. Two remora species (Echeneis naucrates and Remora remora) and four turtle species (Caretta caretta, Chelonia mydas, Eretmochelys imbricata, and Dermochelys coriacea) are here recorded in symbiotic associations in the SW Atlantic. Echeneis naucrates was recorded both on the coast and on oceanic islands, whereas R. remora was recorded only at oceanic islands and in the open sea. The remora-turtle association is usually regarded as an instance of phoresis (hitchhiking), albeit feeding by the fish is also involved in this symbiosis type. This association seems to be rare in SW Atlantic.

A Revision of the Subfamily Octangiinae (Platyhelminthes, Digenea, Microscaphidiidae) Parasitic in Marine Turtles (Reptilia, Chelonia)

1987 ◽  
Vol 35 (1) ◽  
pp. 75 ◽  
Author(s):  
D Blair
Keyword(s):  
Chelonia Mydas ◽  
Eretmochelys Imbricata ◽  
Marine Turtles ◽  
As Species ◽  
Species Inquirendae

The subfamily Octangiinae Looss, 1902 is considered to contain two genera. Two species are recognised in Octangium Looss, 1902. These are O. sagitta (Looss, 1899) Looss, 1902 (hosts Chelonia mydas (L.); Eretmochelys imbricata (L.): synonyms Octangium hasta Looss, 1902; ?O. takanoi Kobayashi, 1921) and O. hyphalum, sp. nov. (host Chelonia mydas: synonym O. takanoi Kobayashi sensu Mehrotra 1973 and Tandon and Gupta 1981). The genus Neoctangium Ruiz, 1943 contains only N. travassosi Ruiz, 1943 (hosts Chelonia mydas; Eretmochelys imbricata: synonym ?Neoctangium trinidadi Gupta, 1962). Octangium microrchis Chattopadhyaya, 1972 (host E. imbricata) and O. elongatum Chattopadhyaya, 1972 (host C. mydas) are regarded as species inquirendae.

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