Slideshow 4 Flashcards
What does GLOBAL-REGIONAL productivity look like
Productivity-diversity relationship is generally positive, but
decelerating.
What does REGIONAL-LOCAL: productivity look like
At these smaller spatial scales - Productivity-diversity
relationships are much more variable…….
WE CAN SEE: HUMP-shaped and U-shaped relationships
What is Increasing limb of hump:
Increased productivity allows more
species to exist at minimum
viable population sizes
What is Decreasing limb of hump:
Puzzle. Why past a certain point
does increasing productivity reduce
the number of species?
What is the Species area relation Power Function
S= CA^Z
LogS= Log C + Z Log A
Power Function Z value
SLOPE: Z is the same as M
Power Function C value
INTERCEPT:C is the same as C
Why does Area and Species Richness Correlate
- Larger areas typically encompass more habitats
- Demographic processes – larger areas can support larger populations of same species
How does Immigration rate change on an island
Immigration declines as the number of species on the
island increases. ZERO - when island contains all species from
mainland population
Why do extinction rates increase when populations of an island increase
(i) There are more species to
go extinct
(ii) The number of individuals per
species decreases as the total
number of resident species
Increases
How was the Theory of island Biogeography tested
experiment in Florida keys on mangrove islands.
each years island sizes were reduced and had seen population decrease
What is the TRIPHASIC SPECIES-AREA RELATIONSHIP curve
curve the compares log species number to log area
SAR is steepest (unity) at the PROVINCIAL (CONTINENTAL) SCALE - when diversities
are compared among biological provinces
What is a Species Abundance Distribution
plot of species by adundance in a community
Negative binomial frequency distribution
