The Morphospecies Concept.docx

2 Pages
135 Views

Department
Biomedical Engineering
Course Code
BMEN 515
Professor
William Huddleston

This preview shows 80% of the first page. Sign up to view the full 2 pages of the document.
Description
The Morphospecies Concept  In traditional cultures, people name species based on morphological similarities and differences  In biology, careful analyses of phenotypic differences are the basis of identifying morphospecies  Morphospecies can be identified in species that are extinct or living, and in species that reproduce sexually or asexually  Fossil species that differed in color or the anatomy of soft tissues cannot be distinguished  Neither can populations that are similar in morphology but were strongly divergent in traits like songs, temperature, or drought tolerance, habitat use, or courtship displays o Species like these are called cryptic species  Species that are indistinguishable morphologically, but divergent in songs, calls, odor, or other traits The Biological Species Concept  Under this concept, criterion for identifying evolutionary independence is reproductive isolation  If populations of organisms do not hybridize regularly in nature, or if they fail to produce fertile offspring when they do, then they are reproductively isolated and considered good species  Great strength of this concept is that reproductive isolation is a meaningful criterion for identifying species because it confirms lack of gene flow  Lack of gene flow is the litmus test of evolutionary independence in organisms that reproduce sexually The Phylogenetic Species Concept  Systematists are biologists who are responsible for classifying the diversity of life  This concept is also known as the genealogical species concept o This approach focuses on a criterion for identifying species called monophyly  Under this concept, species are identified by estimating the phylogeny of closely related populations and finding the smallest monophyletic groups o On a tree like this, species form the tips  Rationale behind the phylogenetic species concept is that traits can only distinguish populations on a phylogeny, if the populations have been isolated in terms of gene flow and have diverged genetically, and possibly morphologically as well  To be called separate phylogenetic species, populations must have been evolutionarily independent long enough for the diagnostic traits to have evolved  Populat
More Less
Unlock Document

Only 80% of the first page are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit