BIOB50H3 Lecture 18: Ecology Lecture 18.docx

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orangeantelope630

27 Apr 2012

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Paradox of plankton: use the same set of resources. Species that belong in the lake, you wont expect to find in the meadow. Some species though can disperse in the community (move from aquatic to terrestrial) There is no one specific process that"s responsible for comm. membership, combination of factors. >dispersal/immigration (dispersing into a given community), abioitic factors, species interaction (competition, predation, mutualistic interactions) Dispersal/immigration: species supply is the first cut to comm. membership. if you load up a ship, you put in cargo and when your shipping the things across the world. You dump all the supplies there, they then fill the ships full of sea water and end up carrying along with them many species and they ships go back to where they came from. If regional richness is low, local richness is low. A ship from south america, the species from there are used to warmer climates and diff light.

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?

blackwasp560

8. Gleason and Clements famously disagreed about the species composition of plant communities. To which statement below would both AGREE? a. The species composition of plant communities is largely random that is, with species distributed independently by chance). b. Plant communities can be classified into discrete types, much as individual organisms can be classified into discrete species. c. Plant species distributions are primarily limited by the interaction of abiotic factors and dispersal. d. Plant communities involve significant associations, in which certain species are found together more often than would be expected by chance.

1)In the Arroyo Seco, the Western Toad feeds on beetles, bees, and small aquatic insects. The Bull Frog has been introduced and eats the same foods. The based on this information interaction between these two species can best be described as:

2)Introduced species such as the Polyphagous Shot Hole Borer can damage the communities they are introduced to by:

changing communities to have a uniform distribution

providing food for native species

increasing species richness

spreading new parasites and diseases

3)Species that compete for the same resources often switch to either use different resources or find ways to reduce competition. Why is this often true?

introduced (exotic species) are always going to be the best competitors

to avoid parasites

direct competition harms both species, even the superior competitor

competition only benefits one of the species

BIOB50H3 Lecture 18: Ecology Lecture 18.docx

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