Lesson 1: Population Dynamics

Question 1

Species

Answer 1

Group of organisms that can interbreed and produce fertile offspring

Question 2

Define population

Answer 2

Same species living together in a given area

Question 3

Define community

Answer 3

Population living together and interacting with each other

Question 4

What is niche? What is it caused by?

Answer 4

Population interacting with each other and abiotic components of the ecosystem. Unique combination of spatial habitat and interactions with other species. (Niche)

Question 5

what are the limits to growth (4)

Answer 5

1. materials and energy– availability of energy, h20,carbon,other materials
2. Food chain– population size ar any trophic level limited by population size and levels below it

3.competition

4.density – number of indivisuals in the area at one time

Question 6

what are the two types of competition

Answer 6

1. intraspecific – between memebers of same species
2. interspecific – between different memebers of different species

Question 7

the niche concept

Answer 7

organisims can survive in a certian environment, with suitable abiotic variables that must be within zone of tolerance as well as the species it needs to interact with.

Question 8

what is competitve exclusion principle?

Answer 8

where 2 species cannot survive indefinatly in the same habitat if thier niches are identical

Question 9

what is fundemental niche?

Answer 9

potential mode of existance
given adaptationsof that species

Question 10

what is realized niche?

Answer 10

actual mode of existance,whcih is the result of both adaptations and compeitions

Question 11

what is density dependant and independant factors?

Answer 11

1.dependant = affect the population as the population size increases –> leads to disease and stress

2.independant = regardless if size and population –> forest fires , flood (natural diseasters)