BIOL 2260 Lecture Notes - Lecture 6: Survivorship Curve, Dall Sheep, Life Table

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Age structure: the distribution of individuals amongst age classes, strongly influencing a population"s growth rate. Cohort: a same species group born at the same time (eg. humans with the baby boom) Size classes can therefore be grouped into age classes. Shift in age structure towards fewer young individuals: older salamanders have a greater chance at survival suggesting at type iii survivorship curve. Lack of recruitment (when juveniles survive to become part of a population by birth or immigration, can be closed (only births) or open (births and immigration). o. This can indicate reproductive failure or low survival rate of young individuals/eggs (typical of a type iii survivorship curve). Different age classes often have different survivorship rates. Baby crocodiles are more prone to predation than adults. Patterns of survival vary wildly among different species and can vary within a species over time or in different environments. List of birth"s, survivorship and deaths for each age class.

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