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BIOL 2P92 (117)
Lecture

Population

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Department
Biology
Course
BIOL 2P92
Professor
Ingrid Makus
Semester
Fall

Description
In populations where mortality rates are high individuals tend to breed earlier in life Read example on mainland and island opossums Pg 500502 Populations have not evolved longer life spans because the power of natural selection declines with ageIn summary o Evolutionary theory of senescence hinges on the observation that the power of natural selection declines late in lifeo This is because most individuals die due to predators diseases or accidentsbefore reaching late in lifeo Two mechanisms can lead to the evolution of senescenceDeleterious mutations whose effects occur late in life can accumulate in populations When there are tradeoffs between reproduction and maintenance selection may favour investing in early reproduction even at the expense of maintaining cells and tissues in good repairo Evolutionary theory of senescence has been successful in explaining variation in life history among populations and species 133 How Many Offspring Should an Individual Produce in a Given YearThe more offspring a parent or pair of parents attempts to raise at once the less time and energy the parent can devote to caring for each oneClutch Size in BirdsSelection will favour the clutch size that produces the most surviving offspring Any individual offspring will survive d
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