Download presentation

Presentation is loading. Please wait.

Published byAyana Cruse Modified over 2 years ago

1
Population Ecology

2
Population Demographics Demographics are the various characteristics of a population including, Population Size, Age Structure, Density, and Distribution Demographics allow one to determine the ecological and evolutionary relationships between various species populations

3
Population Size Population size is represented by the variable N Peterson Population Estimating is a common method for determining Population Size (N) Population Growth can be represented as either ‘exponential’ or ‘logistic’

4
Peterson Population Estimate The Peterson Estimate is a mark and recapture method divided into two sample periods (Precensus and Census)

5
Peterson Estimate Calculation During the Precensus, individuals are captured and marked (M) During the Census, individuals are captured, some of which have marks (R) and some which do not. The total captured on the Census equals (n). Peterson Estimate = (n x M) / R

6
Peterson Estimate Assumptions Assumes that no births, death, immigration, or emigration occur during the census period Assumes that mark are permanent and do not adversely effect the organism

7
Population Growth Factors that increase population size include ‘births’ an ‘immigration’ Factors that decrease population size include ‘deaths’ and ‘emigration’ The Net Reproductive Rate (r) r = [(births + immigration) – (deaths + emigration)]

8
Exponential Growth Population Growth (G) G = r x N New Population Value (N x ) N 1 = (r x N) + N N 2 = (r x N 1 ) + N 1

9
Logistic Growth Population Growth (G) G = r x N [(K-N) / K)] New Population Value (N x ) N 1 = (r x N [(K-N) / K)]) + N N 2 = (r x N 1 [(K-N 1 ) / K)]) + N 1

10
Age Structure Age structure is the number of individuals in each of several to many age categories

11
Population Density Population Density is the number of individuals in a specified area of a habitat

12
Population Distribution Population Distribution is the general pattern in which individuals or a population are dispersed through a specified area Clumped, Uniform, or Random

15
Survivorship Curves Type I High Survivorship until fairly late in life, then a large increase in death

16
Type II Fairly constant death rate at all ages

17
Type III Low survivorship early in life due to high death rate but if they reach adulthood they survive long

Similar presentations

OK

Announcements Wednesday Lab: Turn in Animal Behavior Lab to the black tray. Pick up Chapter 51 posters on Lab Table 2. Any remaining posters will be.

Announcements Wednesday Lab: Turn in Animal Behavior Lab to the black tray. Pick up Chapter 51 posters on Lab Table 2. Any remaining posters will be.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on edge detection image Ppt on indian power grid system Ppt on fire extinguisher types pictures Ppt on spiritual leadership inc Ppt on service oriented architecture ppt Ppt on gunn diodes Ppt on cartesian product business Ppt on machine translation vs human Ppt on alternative sources of energy can save this earth Ppt on obesity management association