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Community Ecology (Interconnectedness of Species (keystone species…
Community Ecology
Interconnectedness of Species
food web
network of numerous interrelationships
energy flow web
how energy flows through a community
dramatically affects structure of the community
food chain
direct line of consumption
keystone species
presence/absence
dramatically affect structure of the community
urchin grazing minimized
kelp spores allowed to germinate
reduce population of sea urchins
extensive underwater forests
Concepts
Community
same time/place
boundaries in time and space
Group of species that occur together
Succesion
predictable sequence of changes
organisms after their habitat
climax community
community remains the same for many years
habitat loss/fragmentation
loss due to human infrastructure
farms
mines
community ecology
may be able to minimize damage
Beneficial Interactions Between Species
mutualism/mutualistic relationship
two organisms interact and both benefit
facilitation
primary succession
organisms establishing on new substrates
nurse plants
one organism helps another but does not benefit
metapopulations in patchy environments
metapopulation
several local populations is interconnected
migration
gene flow b/t patches
conversation biology
preserving endangered species
metapopulation crucial
source habitat
high quality patch
sink habitat
low quality patch
fugitive species
survives by colonizing new patches
then colonizing new patches
assisted dispersal
aka assisted migration
animals captured in one area then released into a new area
plant seeds or whole plants can be moved
