Possible Influence of Beach Sand Characteristics on Green Turtle Nesting Activity on Samandağ Beach, Turkey

Özdilek, Şükran Yalçın; Özdılek, Hasan Göksel; Ozaner, F. Sancar

doi:10.2112/06-0630.1

Cited by 26 publications

(16 citation statements)

References 21 publications

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“…Sediments from all seven rookeries used by the northern Great Barrier Reef (nGBR) green turtle population are predominantly composed of well-sorted, medium-grained to coarse-grained sands, which provide suitable sedimentological characteristics for sea turtle activity and egg incubation (Yalçin-Ozdilek et al 2007). Most of the world's major green turtle rookeries are characterised by similar textural characteristics, with moderately sorted sand and mean particle size ranging from very coarse to medium sand (0-2 j) (Mortimer 1990;Yalçin-Ozdilek et al 2007).…”

Section: Discussionmentioning

confidence: 99%

“…Most of the world's major green turtle rookeries are characterised by similar textural characteristics, with moderately sorted sand and mean particle size ranging from very coarse to medium sand (0-2 j) (Mortimer 1990;Yalçin-Ozdilek et al 2007). The rookeries used by the nGBR green turtle population have great compositional diversity and are either dominated by Foraminifera or molluscs, or both.…”

Section: Discussionmentioning

confidence: 99%

“…For instance, death of carbonate producers may lead to an increase in rates of reef framework degradation and increase sediment supply to islands in the short-to medium-term, potentially changing the sediment characteristics at islands. This could be an issue for sea turtles as they require specific sediment characteristics to dig their nest and incubate their eggs (Mortimer 1990;Chen et al 2007;Yalçin-Ozdilek et al 2007). Sediment size influences turtles' reproductive success and hatchling activity (Yalçin-Ozdilek et al 2007).…”

Section: Discussionmentioning

confidence: 99%

“…This could be an issue for sea turtles as they require specific sediment characteristics to dig their nest and incubate their eggs (Mortimer 1990;Chen et al 2007;Yalçin-Ozdilek et al 2007). Sediment size influences turtles' reproductive success and hatchling activity (Yalçin-Ozdilek et al 2007). A smaller grain size compacts the sand and obstructs excavation by nesting turtles (Fletemeyer 1980;Ehrhart and Raymond 1983), slows down emerging hatchlings from the nest chamber (Fletemeyer 1980) and slows embryo development by reducing diffusion of gases (Mortimer 1981).…”

Section: Discussionmentioning

confidence: 99%

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Sedimentological characteristics of key sea turtle rookeries: potential implications under projected climate change

Fuentes

Dawson

Smithers

et al. 2010

Mar. Freshwater Res.

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Sea turtles rely on reef islands for key parts of their reproductive cycle and require specific sediment characteristics to incubate their eggs and dig their nests. However, little is known about the sedimentological characteristics of sea turtle rookeries, how these sediment characteristics affect the vulnerability of rookeries to climate change, and the ecological implications of different sediment or altered sediment characteristics to sea turtles. Therefore, we described the sediment and identified the reef-building organisms of the seven most important rookeries used by the northern Great Barrier Reef (nGBR) green turtle population. We then reviewed the literature on the vulnerability of each identified reef-building organism to climate change and how various sediment characteristics ecologically affect sea turtles. Sediments from the studied rookeries are predominantly composed of well-sorted medium-grained to coarsegrained sands and are either dominated by Foraminifera, molluscs or both. Dissimilarities in the contemporary sedimentology of the rookeries suggest that each may respond differently to projected climate change. Potential ecological impacts from climate change include: (1) changes in nesting and hatchling emergence success and (2) reduction of optimal nesting habitat. Each of these factors will decrease the annual reproductive output of sea turtles and thus have significant conservation ramifications.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Sedimentological characteristics of key sea turtle rookeries: potential implications under projected climate change

Fuentes

Dawson

Smithers

et al. 2010

Mar. Freshwater Res.

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“…The outcome of the spatial analysis is a habitat suitability map for green turtle with three different classes of suitability which includes very suitable (S1), suitable (S2) and unsuitable (S3). Yamamoto et al (2012), Ozdilek et al (2007), Nuitja (1992), Mc.Gehee (1990), and Goin et al (1978).…”

Section: Discussionmentioning

confidence: 99%

HABITAT SUITABILITY AND ZONING ANALYSIS FOR GREEN TURTLE Chelonia mydas IN THE MARINE CONSERVATION AREAS OF PANGUMBAHAN TURTLE PARK, SUKABUMI

Afandy¹,

Yulianda

Agus

et al. 2017

J. Ilmu dan Teknologi Kelautan Tropis

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ABSTRAK Penelitian ini mengkaji tentang kesesuaian habitat penyu hijau di Kawasan Konservasi Perairan Kata kunci: Chelonia mydas, penyu hijau, kesesuaian, konservasi, Pangumbahan ABSTRACTThis study reviews the suitability of habitat for the green turtle in the Pangumbahan Turtle Park. The purpose of this study is to evaluate the existing zoning system and to provide recommendations of alternative zoning approach based on ecological suitability turtle habitat. Observations and fieldwork were undertaken throughout the coastal area of Pangumbahan from January to June 2015 by collecting data which include nesting site for turtles, sand temperature and moisture content, width of the beach, surface slope of the beach, vegetation cover, seagrass and secondary data. Methods of data analysis consists of suitability analysis with the spatial approach using Geographic Information System. The results of the analysis of overlay method were classified into three classes of suitability, which include very suitable covering 6.91 hectares, suitable covering 14.60 hectares and less suitable covering 37.21 hectares. The current existing zones needs to be revised using the recommended zoning system. As an implementation of the findings from this study as well as to effectively manage the conservation area based on the green turtle ecology, it is highly recommended to do a zoning system which is based on the principal of the green turtles habitat suitability to ensure the sustainability of the green turtle within the conservation area. This will ensure the zoning system suits the green turtles' characteristics hence enabling each of the zones to effectively functioning.

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A 21‐year recovery trend in green turtle nesting activity: 2002–2022

Sönmez,

Mestav,

Özdilek

2023

Aquatic Conservation

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Long‐term monitoring and conservation are crucial for effective protection, since sea turtles migrate cyclically every 2–3 years and lay multiple nests during a breeding season. Therefore, this study aimed to investigate the long‐term trend of nesting activities of green turtles over a 21‐year period (2002–2022) on Samandağ beach. An early morning survey was conducted every year during both nesting and hatching seasons. The trend analyses in nesting activities were performed using Mann–Kendall and Sen's slope tests together with the augmented Dickey–Fuller stationarity test. The nest count and female abundance increased significantly, whereas clutch size, fecundity, and hatching success tended to decrease insignificantly. The percentage change between the most recent and oldest 3‐year mean nest count and mean female abundance, which is performed to comply with the Red List assessment method used by the International Union for Conservation of Nature Marine Turtle Specialist Group, was 769% and 764% respectively. Samandağ nesting population accounts for one‐third of the Mediterranean's total nest count and one‐fourth of its total female abundance. The decrease in clutch size and fecundity may be due to the recruitment of individuals with smaller body sizes or malnutrition as a result of population growth. There was an increase in the number of dead embryos and a decline in hatching success. This may be explained by density‐dependent population regulation as a result of an increase in the number of nests. It may be argued that adherence to a uniform strategy and the maintenance of continuous protection through collaboration with governmental and non‐governmental organizations with scientifically rigorous methodology are significant factors contributing to the high recovery. This study emphasizes the necessity of adopting a comprehensive conservation approach encompassing both foraging habitats and the significant role played by the population in Samandağ in the proliferation of Mediterranean green turtles.

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Possible Influence of Beach Sand Characteristics on Green Turtle Nesting Activity on Samandağ Beach, Turkey

Cited by 26 publications

References 21 publications

Sedimentological characteristics of key sea turtle rookeries: potential implications under projected climate change

Sedimentological characteristics of key sea turtle rookeries: potential implications under projected climate change

HABITAT SUITABILITY AND ZONING ANALYSIS FOR GREEN TURTLE Chelonia mydas IN THE MARINE CONSERVATION AREAS OF PANGUMBAHAN TURTLE PARK, SUKABUMI

A 21‐year recovery trend in green turtle nesting activity: 2002–2022

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