The rate of predation by fishes on hatchlings of the green turtle (Chelonia mydas)

Gyuris, Emma

doi:10.1007/bf00301189

Cited by 118 publications

(127 citation statements)

References 22 publications

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“…Turtle hatchlings face a considerable predatory threat once in the water, and a reduction in swimming speed would increase the amount of time spent in the predator zone. Indeed, Gyuris (2000) found that larger freshwater turtle hatchlings had significantly greater survivorship because of the limited gape size of the fish that prey on them, suggesting that there is a fitness advantage to being bigger. Any significant increase in diel thermal variance experienced during incubation is likely, therefore, to have consequences for hatchling mass, locomotion performance, predation risk, and ultimately survival.…”

Section: Discussionmentioning

confidence: 99%

The Effect of Thermal Variance on the Phenotype of Marine Turtle Offspring

Horne¹,

Fuller²,

Godley³

et al. 2014

Physiological and Biochemical Zoology

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Temperature can have a profound effect on the phenotype of reptilian offspring, yet the bulk of current research considers the effects of constant incubation temperatures on offspring morphology, with few studies examining the natural thermal variance that occurs in the wild. Over two consecutive nesting seasons, we placed temperature data loggers in 57 naturally incubating clutches of loggerhead sea turtles Caretta caretta and found that greater diel thermal variance during incubation significantly reduced offspring mass, potentially reducing survival of hatchlings during their journey from the nest to offshore waters and beyond. With predicted scenarios of climate change, behavioral plasticity in nest site selection may be key for the survival of ectothermic species, particularly those with temperature-dependent sex determination.

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Section: Discussionmentioning

confidence: 99%

The Effect of Thermal Variance on the Phenotype of Marine Turtle Offspring

Horne¹,

Fuller²,

Godley³

et al. 2014

Physiological and Biochemical Zoology

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“…Choerodon cyanodus has previously been documented as a major predator of turtles on this reef (Gyuris 1994), but how the tuskfish handles this prey item has not been recorded. Our 23-s sequence shows the tuskfish repeatedly using a small rock as an anvil while in both sideways and head-down body positions ( Fig.…”

mentioning

confidence: 99%

Tool use by Choerodon cyanodus when handling vertebrate prey

Harborne

Tholan

2016

Coral Reefs

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“…We completed transects across the bay to quantify depth, to locate reefs that could provide shelter for potential predators, and to identify those predators that were most likely to take hatchlings swimming offshore (Stancyk 1982, Gyuris 1994, Pilcher et al 2000, Stewart & Wyneken 2004). The outer transect was made by swimming slowly on a straight path between Pasture and Homer points.…”

Section: Study Sitementioning

confidence: 99%

“…The swimming paths of hatchlings exposed to artificial lighting, for example, show more dispersion from a heading directly offshore than those of hatchlings swimming away from dark beaches (Witherington 1991). Under such circumstances, hatchlings spend more time in shallow water, increasing the probability that they will be detected from below by predators (Gyuris 1994, Wyneken & Salmon 1994, Whelan & Wyneken 2007. At Pasture Bay, those possibilities appeared remote for several reasons.…”

Section: Factors Affecting Predation Ratesmentioning

confidence: 99%

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Hawksbill nest site selection affects hatchling survival at a rookery in Antigua, West Indies

Reising¹,

Salmon²,

Stapleton³

2015

Endang. Species. Res.

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Nesting populations of Critically Endangered hawksbill sea turtles remain depleted across much of their range in the Caribbean. Some islands, however, including Jumby Bay (Pasture Bay) in Antigua, have shown a steady increase in the number of nesting females. Furthermore, in recent years nesting has occurred in particularly high densities within the remnant maritime forest on the northwestern side of the bay, concentrating the entry of emerging hatchlings into the sea along a small (~160 m long) length of shoreline. Previous studies have shown that when many hatchlings enter the sea from a restricted location, aquatic predators may exploit that site. We followed 49 hatchlings by kayak at night as they swam offshore, and we determined that predation rates were significantly higher on the western than on the eastern side of the bay. At both locations, the turtles showed no obvious differences in offshore orientation that might have increased their vulnerability to predators. We hypothesize that the greater predation rate was most likely caused by the presence of more predators. To reduce those predation pressures, we recommend a 2-pronged strategy: (1) 'risk-spreading' (releasing hatchlings at other locations adjacent to, and within, the bay), and (2) habitat restoration to expand the area of attractive nesting habitat.

show abstract

The rate of predation by fishes on hatchlings of the green turtle (Chelonia mydas)

Cited by 118 publications

References 22 publications

The Effect of Thermal Variance on the Phenotype of Marine Turtle Offspring

The Effect of Thermal Variance on the Phenotype of Marine Turtle Offspring

Tool use by Choerodon cyanodus when handling vertebrate prey

Hawksbill nest site selection affects hatchling survival at a rookery in Antigua, West Indies

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