ENV 1101 Lecture Notes - Prentice Hall

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skytoad178

16 Mar 2012

School

University of Ottawa

Department

Environmental Studies

Course

ENV 1101

Professor

Sonia Wesche

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Document Summary

Dramatic declines in amphibian populations since 1980s: mass localized extinctions, locations around the world. Under extremely favourable or extremely unfavourable conditions, the shifts may be dramatic. The number of organisms within an ecosystem from any given species is not stable. The capacity for a given species to increase its number given optimum conditions, through reproduction, geographical expansion of habitat or both. The total sum of factors that limit the potential for a species to increase its numbers or its geographic range. Describes the upper limit of the number of organisms that an ecosystem can support over the long term. Without human intervention, a species below the critical number will likely become extinct (although it is often. The lowest number of organisms required to ensure that a population may reproduce and continue human processes that drive the population below the critical number in the first place) Probably suffered as well from draining wetlands for farming (habitat loss)

Related Questions

Factors whose impact on a population increases as population size increases are known as: a. Limiting factors b. Life-history factors c. Distribution factors d. Density-dependent factors 7. Deer mice are a species with individuals who live short lives and grow up rapidly. They have many, small offspring to which they give little parental care. This life-history strategy describes: a. r-selected species b. K-selected species 8. Which type of species is more likely to have its population size remain close to carrying capacity under normal conditions, rather than going through boom and bust cycles? a. density-dependent species b. r-species c. K-species d. prey species 9. In top-down regulation, the size of a rabbit population is determined by: a. The number of foxes and coyotes in the area b. The severity of winter c. The amount of food found in their habitat d. The biotic potential of female rabbits 10. In the Yellowstone ecosystem, what regulates the size of the elk populations? a. Bottom-up regulation factors b. Top-down regulation factors c. In some cases it is bottom-up and in other cases it is top-down regulation. d. Neither one have a significant impact on elk population size.

ultramarinetermite85

What is the most likely consequence of open pit mining on plant life?

a. a dramatic reduction in the variety of plant species

b. an increase in the number of plant species

c. the complete loss of plant life in the area occupied by the surface mine

d. a temporary decrease in plant populations

rubysnake808

Start with a one-sentencehypothesis.

There are two differentspecies of single-cell organisms (each organism consists ofonly one cell) living in the same environment. The two areidentical except that the members of one species are four timeslarger than the other species. Suddenly their environment becomesdramatically worse: the nutrients that each species requires becomefar less abundant than before. Under this set of now-unfavorableconditions the numbers of individuals of the smaller single-cellspecies remained constant for quite a while before the populationbegan to decrease as the small-cell organisms died from starvation.In contrast, the larger single-cell organisms started to die verysoon after the change of environment and completely disappearedlong before the smaller ones disappeared. Explain this differencein response to a changed environment.

amethystclam892

ENV 1101 Lecture Notes - Prentice Hall

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