Flashcards in Lecture 6-Niches and geographical range Deck (9)
What are the four processes that affect species distribution (climate...)?
-movement of land masses
-effects of islands
-modern human impacts
How did movement of land masses affect species distribution?
-separated animals but can explain some distribution due to the break up of Gondwana
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
What is convergent evolution observed on continents?
-species that look and behave similarly but are not closely related
What is parallel evolution observed on continents?
-similarity of form among related groups
Give an example of convergent evolution.
-wing of a bat and a bird
Give an example of parallel evolution.
-marsupials and placentals= similar thing despite separation
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.