Assessing hatchery management as a conservation tool for sea turtles: A case study in Setiu, Terengganu

Mutalib, Aini Hasanah Abd; Fadzly, Nik

doi:10.1016/j.ocecoaman.2015.05.010

Cited by 23 publications

(10 citation statements)

References 23 publications

(34 reference statements)

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“…In our study, a greater hatching success was found in the beach hatchery compared to polystyrene boxes. In other studies of ex situ incubation methods of sea turtles (box and beach) and their effect on hatching success, discrepancies have been reported, where some did not find significant differences between methods (Wyneken et al 1988, Chan 1989, Abd-Mutalib and Fadzly 2015, Hart et al 2016) and others have obtained similar results to the present study (Revuelta et al 2014, Santos et al 2019. Differences in findings may be attributed to the studied species, environmental conditions, nesting season, type of transport from the beach to the ex situ site, and even the economic resources of the project.…”

Section: Discussionsupporting

confidence: 52%

Evaluación de 2 métodos de incubación ex situ para huevos de tortugas marinas considerando temperatura del nido, éxito de eclosión, y calidad de los neonatos

Ríos-Huerta¹,

González-Hernández²,

Hart³

et al. 2021

Cienc. Mar.

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Dentro del programa de conservación de tortugas marinas en Boca de Tomates, Jalisco (México), todos los nidos de Lepidochelys olivacea son reubicados a corral de playa o a cajas de poliestireno debido a la recolección ilegal de huevos, la depredación, la erosión y las altas temperaturas de la arena. Con ambos métodos de incubación evaluamos los siguientes términos de viabilidad del nido y calidad de los neonatos: éxito de eclosión, temperatura del nido, duración de incubación y calidad de neonatos (desempeño locomotor, morfometría, peso y malformaciones congénitas). El éxito de eclosión fue significativamente mayor en corral (promedio = 77.4%, n = 1368) que en cajas (promedio = 59.91%, n = 1,160) (P < 0.001). Los nidos incubados en corral eclosionaron en menor tiempo que aquellos incubados en cajas (corral = 46 d, cajas = 51 d) (P < 0.001) debido a una temperatura promedio significativamente más elevada (corral = 32.62 ºC, cajas = 30.58 ºC) (P < 0.001). El corral fue expuesto a menor variabilidad de la fluctuación térmica diaria (corral = 1.46 ºC, cajas = 2.69 ºC) (P < 0.001). No encontramos diferencia significativa en ningún parámetro de calidad de los neonatos entre los métodos de incubación (P > 0.050). Determinamos que las malformaciones en L. olivacea tienen baja prevalencia (corral = 1.35%, caja = 1.89%) y bajo índice de intensidad por organismo (corral = 1.52, cajas = 1.89) en este sitio. Este es el primer estudio que conocemos que compara la calidad de neonatos de una misma especie (L. olivacea) entre estos 2 métodos de incubación ex situ en la misma ubicación y durante el mismo periodo de tiempo. Realizar estudios similares a este es importante, puesto que la calidad de los neonatos puede contribuir a su capacidad de supervivencia y reproducción.

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Section: Discussionsupporting

confidence: 52%

Evaluación de 2 métodos de incubación ex situ para huevos de tortugas marinas considerando temperatura del nido, éxito de eclosión, y calidad de los neonatos

Ríos-Huerta¹,

González-Hernández²,

Hart³

et al. 2021

Cienc. Mar.

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“…For better hatchery management, a series of guidelines have been suggested. The first one is the site selection [13] which should preferentially be on the same beach and located at sufficient elevation to prevent damage from flood intrusion and at a safe distance from any plant roots [ 1 , 13 ]. Hatchery fence should be built using wood and plastic material and metal mesh should be avoided.…”

Section: Methods Validationmentioning

confidence: 99%

Hatchery efficiency for turtle conservation in Cabo Verde

et al. 2021

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This paper evaluated the efficiency of beach hatcheries as a conservation tool for threatened sea turtle clutches. During six nesting seasons (2013 to 2018), several thousand high-risk clutches from loggerhead turtles (Caretta caretta) were relocated to a hatchery constructed on the same beach, within the Sea Turtle Natural Reserve (STNR, Boa Vista Island, Cabo Verde). Some parameters like hatching success; incubation period, hatchlings’ morphology and their behavioral response were compared to in-situ clutches. Our findings confirmed that the in-situ nests within the STNR had extremely high egg mortality that was usually over 70 %. Mean hatching success of clutches relocated to hatcheries was significantly higher than in-situ clutches with mean values between 70 to 85 % ( p < 0.0001). No significant differences were observed in the incubation period ( p = 0.786) and morphology of hatchlings (all p > 0.05) between relocated and in-situ clutches. This study provided a detailed method and recommendations for sea turtle clutches relocation to the hatchery, that can be beneficial for endangered sea turtle population specially where hatching success is very low.

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“…After 4 to 6 days of the first emergence, the hatching success of each nest was based on inventory of the nest six days after first hatchling emergence, when the contents of the nest were characterized (Mutalib and Fadzly, 2015). The remains of each nest were classified as number of shells, number of hatchlings found alive within the nest, number of dead hatchlings in the nest, number of unhatched eggs, including those without apparent development and those with unhatched term embryos.…”

Section: Methodsmentioning

confidence: 99%

“…In locations where natural incubation is unlikely to be successful (e.g., because of threat of erosion, predation or collection by people), a common strategy is to move eggs to areas that can be protected until hatchlings are produced (Garcia et al 2003). For sea turtles eggs relocated for conservation purposes, eggs should be incubated in conditions similar to those of natural nests (Mutalib and Fadzly, 2015), in order to minimize potential impacts, including those on hatchling performance (Maulany et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Performance of the sea turtleLepidochelys olivaceahatchlings from a hatchery on the Pacific coast of Guatemala

Morales-Mérida

Contreras-Mérida

Cortés-Gómez

et al. 2021

Preprint

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Sea turtles are marine species that are generally in danger of extinction. The conservation strategies in the different countries are attempting to preserve these species and should be constantly updating their policies according to research results taking place on site. The most abundant and frequent species of sea turtle that nest in the Pacific Coast of Guatemala is Lepidochelys olivacea (Eschscholtz, 1829), therefore human predation has been historically high. The solution to this predation, since the 1970s, as a conservation strategy was to place eggs in enclosed protected spaces called hatcheries, where collectors must give 20% of the nest as a conservation quota. Since this program leads to no natural nests (in situ) remaining on the beaches, the good functioning of the hatcheries plays a fundamental role in the conservation process to work. To understand and predict the fitness of the hatchlings being produced in Guatemalan hatcheries, crawling performance and self-righting performance were measured in 210 hatchlings of the Multiple Uses Area of Hawaii, in the Pacific Coast of Guatemala. The results of the performance were contrasted with incubation conditions to provide an insight into how the management may influence it. We found that self-righting may be a more meaningful measure of variable behavior than crawling performance, showing that there was little variation due to the homogeneous environment of the hatcheries. We can conclude that a greater number of eggs result in faster self-righting, while deeper nests produce hatchlings with slower rates of self-righting.

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Assessing hatchery management as a conservation tool for sea turtles: A case study in Setiu, Terengganu

Cited by 23 publications

References 23 publications

Evaluación de 2 métodos de incubación ex situ para huevos de tortugas marinas considerando temperatura del nido, éxito de eclosión, y calidad de los neonatos

Evaluación de 2 métodos de incubación ex situ para huevos de tortugas marinas considerando temperatura del nido, éxito de eclosión, y calidad de los neonatos

Hatchery efficiency for turtle conservation in Cabo Verde

Performance of the sea turtleLepidochelys olivaceahatchlings from a hatchery on the Pacific coast of Guatemala

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