ring species

This cline is an example of a ring species.

Some have traditionally been considered ring species, but recent evidence suggests that this assumption is questionable.

This population distribution of a species is referred to as a ring species.

An example of this is ring species.

Currently, there are four known forms of life that appear to be matching the definition of a ring species.

It's a ring species with a circumpolar distribution.

Ring species provide important evidence of evolution: they illustrate what happens over time as populations genetically diverge.

A ring species is a species that exhibits a counterexample to transitivity.

(It is analogous to a ring species in evolutionary biology.)

See also - ring species.

In 2012, Cacho and Baum described the first example of a ring species in plants.

The Larus gulls form a ring species around the North Pole.

Ring species also present an interesting case of the species problem, for those who seek to divide the living world into discrete species.

However, this invites confusion with geographically variant ring species or subspecies, especially if polytypic.

Ring species illustrate that the species concept is not as clear-cut as it is often thought to be.

It is a ring species with populations diverging east and westwards of the Tibetan Plateau, later meeting on the northern side.

A classic example of ring species is the Larus gulls' circumpolar species "ring".

Not all species complexes, whether cryptices or ring species are superspecies, and vice versa, but many are.

Finally in 2012, the first example of a ring species in plants was found in a Spurge form around the Caribbean Sea.

Many scientific concepts are of necessity vague, for instance species in biology cannot be precisely defined, owing to unclear cases such as ring species.

The Ensatina salamander is a ring species in the mountains around the Californian Central Valley.

There are species which shade gradually into other species, and which interbreed in overlapping populations (see ring species).

In biology, a ring species is a connected series of neighboring populations, each of which can interbreed with next-door populations.

This issue of how they are to be classified is similar to the issue presented by ring species to the concept of species classification in biology.

Richard Dawkins observes that ring species "are only showing us in the spatial dimension something that must always happen in the time dimension."