Hatching success of Hawksbill sea turtles (Eretmochelys imbricata) in a protected hatchery site in Nakhiloo Island, Persian Gulf

Pazira, Abdolrahim; Moshtaghie, Minoo; Tollab, Mohammd Amin; Ahmadi, Farideh; Rashidi, Mostafa; Faghih, Heidar; Ghorbanzadeh-Zaferani, Ghasem; Mirshekar, Davood; Shamsaie, M; Malekpouri, Pedram

doi:10.1016/j.rsma.2015.11.001

Cited by 12 publications

(7 citation statements)

References 17 publications

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“…Our findings suggest that hawksbill turtles in the Arabian Gulf display a divergent nesting ecology in many aspects relative to other nesting habitats globally [3,4,28,34,35,39]. An extreme environmental setting where air temperatures dramatically change during nesting periods, coupled with the fact that Arabian Gulf hawksbill are smaller and lay smaller clutches per year demonstrates that the region’s population is more vulnerable than those nesting at other rookeries.…”

Section: Discussionmentioning

confidence: 97%

“…ECF is regarded as a more accurate measure of clutch frequency from its recognition of varying survey effort and is a way of accounting for missed nesting events. As hawksbill clutches in the region have been shown to contain small yolkless eggs [39], only bigger, viable eggs were included in the clutch size count.…”

Section: Methodsmentioning

confidence: 99%

“…Despite these recent investigations into hawksbill nesting in the Arabian Gulf, little is known about how their nesting dynamics compare with other global populations [34,35,39,40]. Certain populations of this critically endangered species may be more vulnerable than others due to their natural setting.…”

Section: Introductionmentioning

confidence: 99%

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Nesting ecology of hawksbill turtles, Eretmochelys imbricata, in an extreme environmental setting

et al. 2018

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Relatively few details of hawksbill turtle (Eretmochelys imbricata) nesting ecology exist within the Arabian Gulf. Moreover, little is known about how their nesting dynamics compare to nesting populations throughout the rest of the world. Due to the extreme environmental setting, nesting ecology of hawksbills in the Arabian Gulf is of significant interest to researchers and conservationists. The current research reports on a long-term tagging and monitoring program undertaken at Fuwairit beach, Qatar. To investigate nesting behavior, site surveys and tagging were employed from 2010 to 2016. Presence of nests and clutch sizes were confirmed by excavation. Over the entire study period, nesting hawksbills had a mean curved carapace length of 70.8 cm (SD±2.8). A total 187 nests were confirmed, which contained a mean 78.9 eggs per clutch (SD±17.1), over an annual nesting season that lasted an average of 52.2 days (SD±6.3) from the start of April to the start of June. Meta-analysis with other global regions showed these characteristics to be significantly reduced when compared to nesting hawksbills from other populations. Meteorological data analysis showed air temperatures in the Arabian Gulf to increase on average 13.2°C (SD±0.26) from start to the end of nesting annually, which is significantly greater than other global nesting regions. Their smaller body size and reduced fecundity coupled with the extreme change in ambient air temperatures support the hypothesis that hawksbills in the region are more at risk than the already critically endangered hawksbill populations elsewhere in the world.

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Section: Discussionmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

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Nesting ecology of hawksbill turtles, Eretmochelys imbricata, in an extreme environmental setting

et al. 2018

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“…With regards to the hatching success of temperaturerecorded nests, we found the mean hatching success (74.4 %) to be higher than that of natural nests (47 %, Playa Grande Costa Rica; Santidrian and Swiggs, 2015), which is consistent with our overall finding on hatching success showing that hatchery management increases hatching success. However, the use of a hatchery site may not always guarantee the hatching success (Pazira et al, 2016;Vannini et al, 2011). For example, in a study on leatherback turtle eggs in the Southwestern Caribbean Sea, Patino-Martínez et al (2012) found that the hatching rate was higher in natural nests (79.9 %) than in those transferred to the beach hatchery (67.7 %).…”

Section: Discussionmentioning

confidence: 99%

Incubation temperatures, sex ratio and hatching success of leatherback turtles (Dermochelys coriacea) in two protected hatcheries on the central Mexican coast of the Eastern Tropical Pacific Ocean

García-Grajáles¹,

Hernando²,

Arcos-García³

et al. 2019

Anim. Biodiv. Conserv.

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“…While previous research has predicted hatchling sex ratios using climate data (Hays et al 1999, 2003, Hawkes et al 2007, Fuentes et al 2010, Askari Hesni et al 2016, Laloë et al 2016, Monsinjon et al 2019b, Patrício et al 2019, relatively few studies exist from the extremities of global marine turtle distribution. The Arabian/Persian Gulf (hereafter referred to as 'the Gulf') is an extreme environment in which hawksbill turtles Eretmochelys imbricata nest (Pilcher et al 2014a, Pazira et al 2016, Chatting et al 2018, Rees et al 2019. The sea is a shallow basin with mean and maximum depths of ~35 and 160 m, respectively, and regularly experiences summer sea surface temperatures (SSTs) in excess of 36°C (Price et al 1993, Sheppard et al 2010.…”

Section: Introductionmentioning

confidence: 99%

Feminization of hawksbill turtle hatchlings in the twenty-first century at an important regional nesting aggregation

Chatting

Hamza

Al‐Khayat

et al. 2021

Endang. Species. Res.

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Projected climate change is forecasted to have significant effects on biological systems worldwide. Marine turtles in particular may be vulnerable, as the sex of their offspring is determined by their incubating temperature, termed temperature-dependent sex determination. This study aimed to estimate historical, and forecast future, primary sex ratios of hawksbill turtle Eretmochelys imbricata hatchlings at an important nesting ground in northeastern Qatar. Incubation temperatures from the Arabian/Persian Gulf were measured over 2 nesting seasons. Climate data from same period were regressed with nest temperatures to estimate incubation temperatures and hatchling sex ratios for the site from 1993 to 2100. Future hatchling sex ratios were estimated for 2 climate forecasts, one mid-range (SSP245) and one extreme (SSP585). Historical climate data showed female-biased sex ratios of 73.2 ± 12.1% from 1993 to 2017. Female biases from 2018 to 2100 averaged 85.7% ± 6.7% under the mid-range scenario and 87.9% ± 5.4% under the high-range scenario. In addition, predicted female hatchling production was >90% from 2054 and 2052 for SSP245 and SSP585, respectively. These results show that hawksbill primary sex ratios in Qatar are at risk of significant feminization by the year 2100 and that hawksbill turtle incubation temperatures in an extreme, understudied environment are already comparable to those predicted in tropical rookeries during the latter half of the 21st century. These results can help conservationists predict primary sex ratios for hawksbill turtles in the region in the face of 21st-century climate change.

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Hatching success of Hawksbill sea turtles (Eretmochelys imbricata) in a protected hatchery site in Nakhiloo Island, Persian Gulf

Cited by 12 publications

References 17 publications

Nesting ecology of hawksbill turtles, Eretmochelys imbricata, in an extreme environmental setting

Nesting ecology of hawksbill turtles, Eretmochelys imbricata, in an extreme environmental setting

Incubation temperatures, sex ratio and hatching success of leatherback turtles (Dermochelys coriacea) in two protected hatcheries on the central Mexican coast of the Eastern Tropical Pacific Ocean

Feminization of hawksbill turtle hatchlings in the twenty-first century at an important regional nesting aggregation

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