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BIOL 111 Lecture 3: Lecture 3 - Diversity of Life and Prokaryotes

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crimsonjackal99

28 Sep 2011

School

McGill University

Department

Course

Professor

Irene Gregory- Eaves

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BIOL 111 Full Course Notes

BIOL 111 Full Course Notes

Document Summary

Diversity what is it, how it is measured and which group is most diverse. What is diversity: genetic variation (differences within a species, species composition. Species diversity reserved for indices that measure both the number of species in a habitat as well as their relative abundances. Diverse environments are on the whole better than non-diverse environments. About 13,000 new species found a year, 3000 of these are synonyms (described already but not confirmed). 50,000 tree species*160 species of insects unique to a tree (screw it there could not be an exact value or one that"s even close) According to may in 2002, taxonomists estimate 3-100 million eukaryotic species (extant = living today) (only 10,000 species of bacteria are found, but could range up to 100s of millions) 99% of all species that existed on earth are dead. Doubling the living area increases number of species by 10-25%. Arthropods are by far the most diverse, followed by plants.

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Related Questions

What do ecological descriptions of communities â species richness,relative abundance, species diversity â tell us about interactionsbetween species? Relative stability or health of the communitythrough time?

Q1.14. Which of the following statements about beta diversity is FALSE?

Beta diversity measures how quickly species composition has changed through time.

All else being equal, specialists are likely to be more common where beta diversity is high.

Relatively flat, homogeneous habitats tend to have lower beta diversity.

Beta diversity changes depending on the scale at which you measure it.

Q1.15. Paul Ehrlich and E.O. Wilson offered a number of reasons to protect biodiversity. What were they?

Check all that apply:

Earth cannot "survive" another mass extinction event.

People have an aesthetic and moral obligation to protect Earth's species.

Earth's biodiversity may provide us with important new resources in the future.

Loss of biodiversity may reduce ecosystem services that would be difficult to replace.

A geographical area that contains high numbers of endemic species is known as a(n) _________.

Select one:

a. habitat heterogeneity

b. species-area relationship

c. tragedy of the commons

d. biodiversity hotspot

e. ecosystem diversity

Why do we need a seed vault located in an arctic climate?

Select one:

a. In case other food sources become extinct.

b. So that crops can be grown in built environments and better controlled.

c. To store a variety of seeds as a way of maintaining crop diversity.

d. To store seeds from only certain places in the world that are more hearty and better producers.

e. The arctic climate will kill any insect pest that might threaten crops.