Chapter 19 - Landscape Dynamics Flashcards
an edge
An edge is where two or more different vegetative communities meet
Induced Edges
periodic disturbance
Inherent edge
stable and naturally occurring (example: change in the abiotic soil conditions)
ecotones
The area of transition where two ecosystems meet
patch
An are of habitat that differes from surroundings and has sufficant resources to allow population to persisit
Ecological requirments of edge speices
they are more generalist and typically do not need a hight requirment of things to survivr
Theory of Island Biogeography
How size and connectivity can affect speices richness
Two processes that drive speices richness
Colinization and extiction rates
Metapopulation
A population broken into sets of subpopulations held together by the movement of individuals between each sunset
Metapopulation: Classic Model
These subpopulations are isolated enough to be separate entities, but interconnected enough to permit recolonization which will balance extinction. Everything is even
Metapopulation: Source-Sink Model
The source area is very high quality habitat
Individuals from the source area disperse to the poorer quality sink habitats where they cannot be sustained
Metapopulation: Mainland-Island Model
Large “mainland” subpopulation that is immune to extinction has areas of small subpopulations around it which are prone to extinction
Environmental stochasticity
Random natural disaters that cause change in population like: Wild fires, volcanic eruptions….
Genetic stochasticity
Randomeness in Genetic expressions
Demographic stochasticity
Natural variation in Birth and Death Rates
