BIOLOGY 2F03 Lecture Notes - Lecture 11: Female Sperm, Frequency-Dependent Selection, Environmental Factor
11 Dec 2015
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Indirectly studied their interactions by tracking wolves through winter snow to find their kills ( they often left the skulls of their prey sheep) growth rings on their horns and by studying tooth wear. He determined the age at which each sheep had died by counting the. Skulls showed that the killed sheep were very young and very old. Populations consistently contained more females than males even though juvenile populations were balanced between the sexes. Males dispersed far form the natal population more often than females and mortality of males was higher then that of females. A survivorship curve summarizes the pattern of survival in a population. Life tables: age-specific survival and death or mortality rates in a population. 3 ways to estimate survival: (most reliable) identify a large number of individuals that are born at about the same time and keep records on them from birth to death.
