Lecture 6-Niches and geographical range Flashcards Preview

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Flashcards in Lecture 6-Niches and geographical range Deck (9)
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1

What are the four processes that affect species distribution (climate...)?

-movement of land masses
-effects of islands
-climate change
-modern human impacts

2

How did movement of land masses affect species distribution?

-separated animals but can explain some distribution due to the break up of Gondwana

3

How does the number and appearance of species differ on islands vs mainland?

-islands have fewer species than the nearest mainland
-species are often different
-dispersal ability is key to explaining island biotas
-species with wide dispersal= on islands

4

What is convergent evolution observed on continents?

-species that look and behave similarly but are not closely related

5

What is parallel evolution observed on continents?

-similarity of form among related groups

6

Give an example of convergent evolution.

-wing of a bat and a bird

7

Give an example of parallel evolution.

-marsupials and placentals= similar thing despite separation

8

Can niches explain modern day distribution of species?

-yes, information on species' niches couple with documented changes from the past can explain much of modern day distributions especially over large scales.

9

Do habitable places contain all the species that could live there?

-no