BGYC63 Nov08

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Published on 15 Oct 2011
School
UTSC
Department
Biological Sciences
Course
BIOC63H3
Professor
for assignment: show t value, df, and p (significance of test) and CI or SE
BIOC63 Nov08
Species and Population Approach
1. Why focus on species/populations?
- species are the unit of evolution; which creates biodiversity
-so inorder to keep biodiversity, we must preserve species
- each coutnry has its own endangered species list (international)
- we are more likely to get money when it is species oriented (saving river vs saving panda)
2. Life history characteristsics of species as predictors of extinction likelihood
- extinction rate of primates vs carnivores
- the greatest predictor of the extinction of a species is its geographic range
- also for primates, it is also body mass (the greater the body size, the higher chance of it
becoming extinct)
- on the other hand, for carnivores, the longer the gestation length, the higher chance of them
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becoming extinct)
- on a different graph, just looking at song birds (we are currently losing them at the strongest
rate)
- the more the bird is picky on its habitat, the lower the population size
- and omnivores are doing better than those birds who only feed on seeds
- fresh water fish vs marine fish
- for fresh water, the distribution of size that is at risk is similar to the entire data
- body size is a very good predictor of extinction for marine fishes (large fishes are much more
hunted than thier original distribution of sizes)
- plants; how they are pollinated
- the plant species are least at risk then they depend on the wind for polonation, on the other hand
it becomes highly at risk when the plant depends on a single species for pollination
- also, the sexual system varies...at the least risk, they dont need anyone (apomictic -> look up!)
on the other hand, at the higher end of the spectrum, some plants need to be non-related to the
mate (self-incompatible), or dioecy; where one plant only produces eggs and another plant only
produces pollen
*left for the washroom*
3. Populations and how they "behave"
carrying capacity; the maximum amount of individuals that can be supported in a given habitat; it
is density dependent
- limitation (density dependent):
- resource (space, food, light, nutrients)
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Document Summary

For assignment: show t value, df, and p (significance of test) and ci or se. Species are the unit of evolution; which creates biodiversity. So inorder to keep biodiversity, we must preserve species. Each coutnry has its own endangered species list (international) We are more likely to get money when it is species oriented (saving river vs saving panda: life history characteristsics of species as predictors of extinction likelihood. The greatest predictor of the extinction of a species is its geographic range. Also for primates, it is also body mass (the greater the body size, the higher chance of it becoming extinct) On the other hand, for carnivores, the longer the gestation length, the higher chance of them becoming extinct) On a different graph, just looking at song birds (we are currently losing them at the strongest rate) The more the bird is picky on its habitat, the lower the population size.