Evidence for Synchronous Hatching in Marine Turtle (Caretta caretta) Embryos and Its Influence on the Timing of Nest Emergence

The goal of this study was to determine whether marine turtle (loggerhead) embryos communicate with one another using mechanical cues detected through the flexible egg shell. In the process, the embryos might develop faster and hatch with greater synchrony (as occurs in some freshwater turtles). To...

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Bibliographic Details
Published inChelonian conservation and biology Vol. 20; no. 2; pp. 173 - 183
Main Authors Field, Angela, McGlashan, Jessica K, Salmon, Michael
Format Journal Article
LanguageEnglish
Published Lawrence Chelonian Research Foundation and Turtle Conservancy 01.12.2021
Allen Press Inc
Subjects
Animal embryos
Aquatic reptiles
Caretta caretta
Carettochelys insculpta
Chelonia mydas
Dermochelys coriacea
Eggs
embryo-to-embryo communication
Embryogenesis
Embryos
Emergence
Eretmochelys imbricata
Experiments
Females
Freshwater
Freshwater tortoises
Hatching
hatching synchrony
Inland water environment
Laboratories
Lepidochelys kempii
Lepidochelys olivacea
loggerhead turtle
Metabolism
Radiation
Sand & gravel
Social environment
Substrates
Turtles
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Summary:The goal of this study was to determine whether marine turtle (loggerhead) embryos communicate with one another using mechanical cues detected through the flexible egg shell. In the process, the embryos might develop faster and hatch with greater synchrony (as occurs in some freshwater turtles). To find out, we performed experiments under controlled laboratory conditions to determine how changes in the embryonic social environment affected both the rate of development and the temporal pattern of hatching when temperature, moisture, and substrate composition were controlled. We found that developmental periods were significantly shortened and hatching synchrony was increased when 1) a critical number of eggs were in contact with one another, facilitating the possibilities for embryos to communicate, and when 2) a threshold number of those eggs remained viable and completed development at about the same time. We used this information, in combination with field studies done by others, to clarify temporal relationships between hatching and emergence from the nest that occurs several days later.
ISSN:1071-8443
1943-3956
DOI:10.2744/CCB-1489.1