Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284689
Title: Studies on the embryology, ecology and evolution of sea turtles in the Eastern Mediterranean
Author: Kaska, Yakup
ISNI:       0000 0001 3595 3379
Awarding Body: University of Glasgow
Current Institution: University of Glasgow
Date of Award: 1998
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Abstract:
1-) The temperature of sea turtle nests in the Eastern Mediterranean was between 24 and 35 "C and rose by up to 10 "C during incubation. 2-) The mean incubation temperature can be used for estimating the incubation period but provides a poor prediction of sex ratio. 3-) The mean temperature during the middle third of the incubation period was closely correlated with the percent sex ratio. 4-) There was a female dominated sex ratio among the 22 nests and only one loggerhead turtle nest showed less than a 50 % female sex ratio. 5-) There was a consistent temperature difference within the nest with top eggs warmer, bottom eggs cooler and middle ones intermediate. Therefore the majority of hatchlings 11'0111 the top level in nests were females and those from the bottom level were predominantly males. 6-) Temperature differences within the nest also influenced the rate of development; the greater the difference in temperature between top and bottom the longer the time required to complete hatching of all embryos of the nest. The hatching intervals of green turtle nests were shorter than those at loggerhead turtle nests. Temperature variation between top and bottom of nests was low within green turtle nests. In general, a 1 "C temperature difference within the clutch caused a 4 day range in both hatching and emergence of hatchlings. 7-) Since the temperature within the nest and between the nests was so variable, sand air or sea water temperatures gave a poor prediction of the temperature of a nest and therefore the sex ratio. 8-) Although the predation pattern of sea turtle nests varied in relation to nest age, this predation can be reduced by screening the nest with mesh grids.9-) lnundation was one of the main abiotic factors lowering the hatching success on the beaches. Hatching success can be increased by relocating the nests to a safer area on the night of laying 10-) The mean grain sizes of sand ranged from 0.49 to 2.20 phi(
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.284689  DOI: Not available
Keywords: QH301 Biology Zoology Ecology
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