Lec 16- How do we model populations?

Question 1

science

Answer 1

representation of an idea

Question 2

What do birth and immigration do to population:

Answer 2

increase pop

Question 3

what do death and emmigration do to population:

Answer 3

decrease pop

Question 4

non-sessile

Answer 4

animals move freely and take advantage of dispersal vectors.

Question 5

Death

Answer 5

could be from old age, disease, lack of resources, herbivory, predation.

Question 6

Nt+1

Answer 6

population size in the future (at time + 1)

Question 7

Nt=

Answer 7

population size at time ‘t’

Question 8

Nt+1=Nt+B+I-D-E

Answer 8

changes in population size as a function of past population size and the BIDE factors.

Question 9

Net reporoductive rate (R0)

Answer 9

average number of offspring produced by a female individual in her lifetime

Question 10

Geometric Rate (/)

Answer 10

the ratio of the population size at two points in time

Question 11

Generation Time (T)

Answer 11

the average age within a population at which a female gives birth to her offspring. Can be greater than the age of first reproduction, if females reproduces more than once.

Question 12

Per Capita rate of increase (r):

Answer 12

equal to per capita birth rate minus per capita death rate

Question 13

2 types of dispersals and examples

Answer 13

Abiotic: wind water

Biotic: birds, insects etc.

Question 14

Density independence- example

Answer 14

a windstorm can increase the # of deaths independent of population density

Question 15

density dependence- example

Answer 15

high moose density leads to high tick (parasite) density, which decreases # of births and increases deaths among juveniles.

Question 16

How do we measure the rates of population change

Answer 16

by using a life and a fecundity schedule

Question 17

fecundity schedule

Answer 17

a tabulation of birthrates for females of different ages in a population

Question 18

What are the 4 parameters of population change

Answer 18

-Net reproductive rate
-geometric rate of increase
-generation time
-per capita rate of increase

Question 19

Net reproductive rate (R0)

Answer 19

average number of offspring produced by a female individual in her lifetime

Question 20

geometric rate of increase (/)

Answer 20

the ratio of the poppulation size at two points in time

Question 21

generation time (T)

Answer 21

the average age within a population at which a female can be greater than age of first reproduction, thats if female produces more than once

Question 22

per capita rate of increase (r)

Answer 22

equal to per capita birth rate minus per capita death rate (b-d)