L8 - population ecology part 2 Flashcards

1
Q

what is the equation for exponential growth

A

Nt = N0e^rt

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2
Q

what is the equation for logistic growth?

A

Nt = K/ 1+ [(k-No)/No]e^-rt

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3
Q

what two variables does a survivor ship curve correlate

A

number of offspring to age of the species

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4
Q

what does a type one survivorship curve look like?

A

high infant and adult survivorship until end end of life
- most dying are old

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5
Q

what does type two survivorship curve look like?

A

mortality is evenly distributed over age and classes
- constant number of deaths over time

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6
Q

what does a type three survivorship curve look like?

A

high juvenile deaths, followed by constant mortality for rest of life span
- high reproduction rates offset high mortality.

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7
Q

what is a reproductive value?

A

reproductive value = present progeny + future expected progeny
changes with age.

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8
Q

what is a matrix model?

A

matrix models use estimates of vital rates at different ages to project future growth.

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9
Q

what is a population viability analysis (PVA)

A

use of a population models to estimate the probability of extinction for populations of different sizes.

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10
Q

what is a metapopulation?

A

A network of semi-isolated populations with some level of regular exchange, immigration, emigration and gene flow.
populations of populations

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11
Q

what are the two types of metapopulations?

A

sources- grow the population and export individuals
Sinks- decline the population and depends on immigration

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12
Q

what are the organizational hierarchy of ecology

A

species < population < communities < ecosystem < biosphere

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