Lecture 16

Question 1

What determines community composition?

Answer 1

local scales
broader scales

Question 2

Local scales

Answer 2

abiotic and biotic factors

Question 3

Broader scales

Answer 3

regional processes

Question 4

Global scale

Answer 4

species have been isolated from eachother on different continents or in different oceans, by long distances over long periods

Question 5

What determines diversity & composition?

Answer 5

speciation, extinction, dispersal

Question 6

Regional Scale

Answer 6

areas with uniform climate; the species are bound by dispersal to that region

Question 7

Regional species pool

Answer 7

all the species contained within a region (gamma diversity)

Question 8

Landscape scale

Answer 8

topographic and environmental features of a region

Question 9

Local scale

Answer 9

equivalent to a community; local species diversity (alpha diversity), is determined by species physiology and interactions with other species

Question 10

Beta diversity

Answer 10

change in species # and composition, or turnover of a species, from one community to another

Question 11

Global patterns of species diversity & composition are controlled by

Answer 11

geographic area & isolation
historical factors
global climate

Question 12

Vicariance

Answer 12

evolutionary separation of species by barriers such as those formed by the continental drift

Question 13

Species diversification rate

Answer 13

net increase or decrease of species over time

Question 14

Equilibrium theory of island biogeography

Answer 14

number of species on an island depends on balance between immigration or dispersal rates & extinction rates

Question 15

Turnover

Answer 15

replacement of a species with another