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Marine Bio Fishes, Reptiles, & Mammals

Terms in this set (76)

•Adult females don't nest every year (But when they do they lay lots of eggs)
•Sea turtles breed at sea: internal fertilization (copulation)
•Females can store sperm
•One clutch (group) of eggs can have multiple paternity: males and females are not monogamous
•Females normally breed every 2-4 years
•Females must return to land to deposit their eggs above the high tide
•Females dig a hole in the sand using only the back flippers
•During their breeding year, females may lay up to 7 clutches of eggs
•Each clutch of eggs normally have more than 100 eggs
•Eggs have a typical incubation period of around 60 days, although this varies according to air temperature
•Warmer temperatures means eggs will develop faster, colder temperatures lengthen the process
•The eggs are leathery, gradually becoming more brittle, making it easier for the hatchlings to escape
Sea turtles, like many reptiles, show temperature-dependent sex determination
•The gender of the hatchling is not genetically predetermined but determined by the temperature in which the eggs are incubated
•For each species, there is a temperature that will produce 50% males and 50% females; temperatures higher than this temperature will produce more females, lower temperatures more males
•Potential problem: global warming!
•Turtles are promiscuous!
•Females may mate with several males prior to nesting season and store the sperm for several months.
•When she finally lays her eggs, they will have been fertilized by a variety of males
•Courtship is a tough game!
•Several males will compete for females and may even fight each other