Ecology Exam 2 Material

Key ideas

Gamma diversity

at the regional scale; increases with landscape-level environment heterogeneity dispersal

Beta Diversity

difference in species composition between local communities (turnover)

betwn local-scale and within regional-scale

Alpha Diversity

within local-scale communities

Species richness tends…

to increase with area

appearance

speciation or immigration

disappearance

global extinction

local extinction

emmigration

Metapopulation

group of populations connected by exchange (dispersal)

Metacommunity

set of interacting communities connected by dispersal of multiple, potentially interacting, species

What influences the balance between appearance and disappearance of species?

isolation of an area. (immigration potential)

size of an area (like hitting a target)

community assembly processes

species pool

dispersal

environmental filters

species interactions