lecture 09 - GEOGRAPHY OF EVOLUTION Geographic distribution...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
GEOGRAPHY OF EVOLUTION Geographic distribution as evidence for evolution o Current environment (by itself) cannot account for distribution because many species do not exist where they could flourish Ex) Introduced species tend to thrive Ex) Examples of dispersal in recent times (cattle egrets) o Similar niches are often occupied by unrelated taxa in different regions Ex) nectar feeding birds Ex) Cacti vs. Euphorbs Ex) Vipers in all continents, except Australia, where they have the similar species: death adders o Taxa occupying different habitats within the same region are often more closely related than are taxa occupying similar habitats in different regions Ex) Darwin’s finches – very different lifestyles, closely related Similar genetics, different models Would individually be more similar to different birds Endemism vs. disjunction Endemic – species and higher taxa are limited in their distribution Disjunction – species occupy 2 or more regions that are not
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/31/2008 for the course BIOEE 2780 taught by Professor Geber during the Fall '07 term at Cornell.

Page1 / 3

lecture 09 - GEOGRAPHY OF EVOLUTION Geographic distribution...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online