BI111 Lecture Notes - Lecture 7: Reproductive Isolation, Gene Flow, Ring Species

40 views3 pages
22 Jan 2016
Lecture 7 – Monday January 18, 2016
What is a Species?
Carl Linnaeus
oBinary nomenclature
Genus and species
All the members of a species t under a genus
Nested Hierarchy of Life
Species based on phenotype
What is a Species?
A group of organisms that is biologically “distinct” from others
and evolving along a lineage
oHow distinct?, why is it a group?, and what makes an
organism an “other”?
oA long-standing question, many (>22) possible answers
depends on species concept
What is a Species Concept?
A set of conditions that are necessary and su*cient to identify a
group of individuals as a species
Species concepts do not only dene what a species is, but in
doing so, they also dene what speciation is
Why Do We Need A Species Concept?
Important to many biologists working in the elds of:
oEvolutionary biology
oEcological and Behavioural studies
oConservation biology
Morphological Species Concept
Organisms are classied in the same species if they appear
identical by morphological (anatomical) criteria
Species delineations based on notable di1erences in phenotype
A practical approach that is widely understood by
both scientists and non-scientists
Focuses on novelties that have arisen over time
(diagnostic characters)
Useful for classifying the fossil record
Unlock document

This preview shows page 1 of the document.
Unlock all 3 pages and 3 million more documents.

Already have an account? Log in

Get OneClass Notes+

Unlimited access to class notes and textbook notes.

YearlyBest Value
75% OFF
$8 USD/m
$30 USD/m
You will be charged $96 USD upfront and auto renewed at the end of each cycle. You may cancel anytime under Payment Settings. For more information, see our Terms and Privacy.
Payments are encrypted using 256-bit SSL. Powered by Stripe.