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More Information about: species
Term species
Explanation Loose, practical definition: A group of individuals that can be recognised on the basis of shared morphological character traits and that resemble each other more than that they resemble inividuals with similar character traits.
One biological definition: A group of actually or potentially interbreeding populations that are reproductively isolated from other such groups (Ernst Mayr, 1963).

There are many definitions of species, many relating to the field they are applied to (identification, ecology, phylogeny, evolution, etc.). Many of the different definitions would give different results as to the species status of some populations of organisms: a population might be considered a species in the view of a evolutionary species concept but not in the view of a biological species concept. In addition it should be noted that a definition applied to one groups of organisms might not be applicabale to another group of organisms; for example groups of different evolotionary origin (bacteria, plants, vertebrates, arthropods, etc.) or groups wiht different life histories (sexually interbreeding, parthenogenetic, etc.).

Links: http://en.wikiped...biology%29, related pages and links offer a very full discussion.
Category Taxonomy
Submitted by Paul Beuk
Date Added/
Modified		 23.11.09
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pensae
17.08.23 15:23
Aneomochtherus

pjt
17.08.23 13:54
Tony, I HAD a blank in the file name. Sorry!

pjt
17.08.23 13:44
Tony, thanks! I tried it (see "Cylindromyia" Wink but don't see the image in the post.

Tony Irwin
17.08.23 11:37
pjt - just send the post and attached image. Do not preview thread, as this will lose the link to the image,

pjt
16.08.23 08:37
Tried to attach an image to a forum post. jpg, 32kB, 72dpi, no blanks, ... File name is correctly displayed, but when I click "Preview Thread" it just vanishes. Help!

Gordon
23.02.23 21:29
Has anyone used the Leica DM500, any comments.

Paul Beuk
27.12.22 21:10
Thanks, Jan Willem! Much appreciated. Grin

Jan Willem
19.12.22 11:33
Thanks Paul for your work on keeping this forum available! Just made a donation via PayPal.

Zeegers
09.10.22 17:07
Yes, dipterologists from far abroad, please buy your copy at veldshop. Stamps will be expensive, but he, the book is unreasonably cheap Smile

lisharris
07.10.22 11:55
Can any1 help out with a pdf copy of 1941 Hammer. Vidensk. Meddel. Dansk Naturhist. Foren. 105; thank you

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