Species concept overview

John Wilkins is an expert on species concepts in biology; he has written a short piece for wide circulation on the topic which is archived at his blog: “How many species concepts are there?” I just lectured on that topic in my introductory course, and it’s good to have such an accessible introduction to the topic. In this case, Wilkins focuses on the philosophy – why are there different concepts, and what do we mean when we say that?