Ecology Exam 2

Dispersal

One way movement

Migration

Return involved

Plant trade off

Dispersal for nutrients and vice versa

3 types of migration

Long range, short range and periodic

Vertical migration

Moving up or down depth or altitude

Native species

In natural range

Introduced

Moved into habitat outside of range

Exotic

Is outside natural range

Invasive

Outside range, builds population and excludes other species

10% rule

Only 10% of introduced species become invasive

Tragedy of the commons

Shared resources when more take all suffer

Driftnetting

Drag net above ocean floor

Longline

Long net with many hooks

Bottom trawling

Net dragged along ocean floor

Lincoln-Peterson index

For population estimates

Exponential growth

J shape

Logistic growth

S shape

Geometric growth model

Compares population sizes at regular time intervals

SIR model

Susceptible Infected Resistant

Species area curve

More area means more species

Species accumulation curve

More species means more individuals sampled

Shannon index

Measures species richness

Simpson index

Measures species diversity