Flashcards in Lecture 7- Pop parameters, pop change Deck (24)

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1

## Population

### A group of potentiall interbreeding individuals of the same species at the same place at the same time (N)

2

## Natality

### Reproduction/fecundity, actual or potential

3

## Mortality

### Death, realized (actual lifespan) or potential (Max lifespan)

4

## Imm/Emigration

### dispersal, assumed to be equal

5

## Age-structured pop

### population made up of different age classes

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## Stage-Structured pop

### pops made up of stages (used when age classes are not available, survival/reproduction are more dependant on stage than age)

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## Per capita rates

### Average rates per individual in a population

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## Age-specific survival rates

### Survival rate for a specific age class

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## Intrinsic rate of increase

### The max rate of increase if there was no limit to resources, competition or predation (r^m or rmax)

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## instantaneous rate of increase (r)

### The difference between birth and deaths (+=increasing, - = decreasing, and 0=nochange)

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## Finite rate of increase (lamda or R)

### Rate of pop change (e^r), (lamda>1 =increasing, Lamda<1=decreasing, lamda=1 stable)

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## Carrying Capacity (K)

### The natural limit to population size set by resource availability

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## Basic equation for population growth?

### Nt+1 = Nt + B-D

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## What are the equations for per capita birth and death rate?

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Per capita (B)= (total births during time t)/Nt

Per capita (D)= (total deaths during time t)/Nt

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## What is the equation for rate of change?

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r=B-D

Where r is pop growth rate

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## How does the finite rate of increase (lamda) relate to the instantaneous rate of increase (r) ?

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(lamda) = (e^r)

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## express lamda as a result of a ratio of two censuses

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lamda = Nt+1/ Nt

Where Nt+1 is the new census and Nt is the previous census

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## how do you find the population in the next time period using lamda?

### (lamda)(Nt) = Nt+1

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## What 3 ways can r and lamda express pop change?

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Stable- (r=0, Lamda= 1)

Increasing (r>0, Lam>0)

decreasing(r<0)

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## Given r=0.69 and No=50, what will N be after 20 years?

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e^rt X No= Nt

(e^0.69x20) X 50 = N20

N20=~49 mil

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## Is rmax (intrinsic rate of increase) typically found in nature?

### No, there are often limits to pop growth. Food, comp, pred

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## When can intrinsic rate of increase occur?

### Colonizing new areas or recovering from over exploitation

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## How is carrying capacity built into other models (What equation uses L to relate to r or rmax)

###
r=rmax (1-N/K)

r- intantaneous rate of increa

rm- max rate of increase

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