GCU BIO 319: LATEST A+ QUESTIONS AND ANSWERS
GUIDE FOR ULTIMATE SUCCESS
Biodiversity
describes diversity at multiple spatial scales
implicit
The interconnectedness of all components of biodiversity
relative abundance
the % composition of species relative to the total number of species
Rank-abundance curves
plot the proportional abundance of each species relative to the others in rank order, from most
abundant to least abundant
How do researchers determine when they have sufficiently sampled a community so that
they are confident that they have sampled most species? Species accumulation curves:
Species richness plotted as function of total number of individuals counted
Species accumulation curves
What are Species accumulation curve
Species richness plotted as a function of total number individuals counted
species richness or simple metric doesn't account for
Relative abundance
Disparities in relative abundance affect diversity estimates in two ways
the total number of species in a sample depends on sample size and individual species may not
contribute equally to diversity
total number of species in a sample depends on sample size
need to correct for amount of effort to compare richness among different samples
individual species may not contribute equally to diversity
The functional importance of a species in a community will often be related to its abundance
γ
he probability that any two species drawn randomly from the sample will be the same species
, pi (Simpson)
proportional abundance of each species in the total sample
community with 2 species equal in abundance (Simpson)
Si=S
community with 2 species, one is 90% and the other 10% (Simpson)
Si<S
Pi (shannon)
proportion of individuals in the ith species
S
Relative abundance can be assessed using
Rank-abundance
Ecologists use species accumulation curves to determine whether they have sufficiently
sampled a...
Community
Diversity can be calculated using
Simpson or shannon index
Interaction strength
the effect of one species on another species (Often measured experimentally by removing one
of the species and measuring the effect on the other)
Interaction strength may depend on
environmental factors
Interaction strength strength was greater in ...
protected areas
Dominant species or foundation species
Have large effects on other species, and thus species diversity, by virtue of their considerable
abundance or biomass
ecosystem engineers
create, modify, or maintain physical habitat for themselves and other species
GUIDE FOR ULTIMATE SUCCESS
Biodiversity
describes diversity at multiple spatial scales
implicit
The interconnectedness of all components of biodiversity
relative abundance
the % composition of species relative to the total number of species
Rank-abundance curves
plot the proportional abundance of each species relative to the others in rank order, from most
abundant to least abundant
How do researchers determine when they have sufficiently sampled a community so that
they are confident that they have sampled most species? Species accumulation curves:
Species richness plotted as function of total number of individuals counted
Species accumulation curves
What are Species accumulation curve
Species richness plotted as a function of total number individuals counted
species richness or simple metric doesn't account for
Relative abundance
Disparities in relative abundance affect diversity estimates in two ways
the total number of species in a sample depends on sample size and individual species may not
contribute equally to diversity
total number of species in a sample depends on sample size
need to correct for amount of effort to compare richness among different samples
individual species may not contribute equally to diversity
The functional importance of a species in a community will often be related to its abundance
γ
he probability that any two species drawn randomly from the sample will be the same species
, pi (Simpson)
proportional abundance of each species in the total sample
community with 2 species equal in abundance (Simpson)
Si=S
community with 2 species, one is 90% and the other 10% (Simpson)
Si<S
Pi (shannon)
proportion of individuals in the ith species
S
Relative abundance can be assessed using
Rank-abundance
Ecologists use species accumulation curves to determine whether they have sufficiently
sampled a...
Community
Diversity can be calculated using
Simpson or shannon index
Interaction strength
the effect of one species on another species (Often measured experimentally by removing one
of the species and measuring the effect on the other)
Interaction strength may depend on
environmental factors
Interaction strength strength was greater in ...
protected areas
Dominant species or foundation species
Have large effects on other species, and thus species diversity, by virtue of their considerable
abundance or biomass
ecosystem engineers
create, modify, or maintain physical habitat for themselves and other species
