Journal ArticleDOI
Influence of Incubation Environment on the Development of the Flatback Turtle (Natator depressus)
TLDR
Natator depressus eggs seem to be laid with sufficient water reserves for successful embryonic growth and development, which would make them independent of supplementary water from the environment.Abstract:
During the Australian summers of 1996/1997 and 1997/1998, the embryonic development of Natator depressus was investigated in the laboratory. Eggs were incubated under different thermal and hydric conditions on vermiculite substrates. The thermal environment between 26 and 32 C significantly influenced the water exchange of eggs, incubation duration, nutrient mobilization of embryos, and the size, tissue hydration, and energy reserves of hatchlings. Hatchlings produced at 26 C and 29 C were larger but had lower energy reserves than those produced at 32 C. The influence of the hydric environment depended greatly on the range of substrate water potentials used in experiments. Nutrient mobilization of embryos and the size and energy reserves of hatchlings were dependent on total egg water exchange over the range of 2% gain to 29% loss (at approximately −180 to −3500 kPa incubation substrates) of initial egg mass but independent within the narrower range of 6% gain to 19% loss (at approximately −200 t...read more
Citations
More filters
Journal ArticleDOI
Consequences of climatic change for water temperature and brown trout populations in Alpine rivers and streams
TL;DR: In this paper, the authors employed a quantitatively defined reference optimum temperature range for brown trout, based on the sinusoidal regression of seasonally varying field data, and found that brown trout catch data documenting an altitudinally dependent decline indicate that climate-related population decrease has in fact occurred.
Book ChapterDOI
Chapter 2. Vulnerability of marine turtles to climate change.
TL;DR: In this paper, the authors consider the evidence and likely consequences of present-day trends of climate change on marine turtles and consider the potential negative impacts of such changes on marine turtle populations.
Journal ArticleDOI
Maternal transfer of trace elements in leatherback turtles (Dermochelys coriacea) of French Guiana.
TL;DR: Maternal transfer to eggs and relationships between blood and eggs concentrations during the nesting season were investigated, and toxic metals were lower than essential elements likely due to the high pelagic nature of leatherbacks that seems to limit exposure to toxic elements.
Journal ArticleDOI
Antigua revisited: the impact of climate change on sand and nest temperatures at a hawksbill turtle (Eretmochelys imbricata) nesting beach
F. Glen,N. Mrosovsky +1 more
TL;DR: Measurements in both the sand and the clutches laid by hawksbill turtles at Pasture Bay, Antigua, show that for important parts of the nesting season temperatures are already above the level producing 50% of each sex (pivotal level).
Journal ArticleDOI
Deforestation: Risk Of Sex Ratio Distortion In Hawksbill Sea Turtles
Stephanie J. Kamel,N. Mrosovsky +1 more
TL;DR: The thermal profile of a relatively pristine hawksbill nesting beach in Guadeloupe was examined to assess the relative contributions of the different beach zones to the primary sex ratio: significantly more males were likely to be produced in the forested areas than in the more open, deforested areas.
References
More filters
Journal ArticleDOI
The physiological ecology of reptilian eggs and embryos. and the evolution of viviparity within the class reptilia
TL;DR: Eggs of Crocodilia and Chelonia have a pair of egg membranes separating a thick layer of albumen from the calcareous shell, while eggs of oviparous Lepidosauria have only a single shell membrane, upon which relatively small amounts of calcium carbonate are deposited.
The Nest Environment and the Embryonic Development of Sea Turtles
TL;DR: The thermal tolerance range for development of sea turtle embryos incubated at constant temperature appears to fall between about 25 to 27°C and 33 to 35°C, and is around 10°C wide as mentioned in this paper.
Journal ArticleDOI
An Experimental Analysis of Natural Selection on Body Size of Hatchling Turtles
TL;DR: Larger hatchling Chelydra serpentine exhibited significantly greater survivorship than smaller individuals during movement from the nest site to water, suggesting that larger body size of hatchling turtles may not evolve rapidly because the strength of selection was moderate in magnitude and the heritability was relatively low.
Journal ArticleDOI
Influence of Moisture, Temperature, and Substrate on Snapping Turtle Eggs and Embryos
TL;DR: Findings from this study indicate that temporal and spatial variations in moisture and temperature within and among natural nests probably elicit ecologically important variation in size and sex of hatchling snapping turtles.