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Broadly speaking, the gulls can interbreed to some extent with their neighbours, except at the two ends of the ring. Many of the existing plant and most animal species have apparently undergone polyploidization in their evolutionary history.The Lesser Black-backed Gulls and Herring Gulls are sufficiently different that they do not normally hybridize; thus the group of gulls forms a continuum except where the two lineages meet in Europe. Reproduction of successful polyploid species is sometimes asexual, by parthenogenesis.Although it would be possible for a single pregnant female to colonise an island, it is more likely to have been a group from the same species. The Greenish Warbler (Phylloscopus trochiloides) has a number of subspecies, of which P. Often-cited examples of sympatric speciation are found in insects that become dependent on different host plants in the same area.In biology, a ring species is a connected series of neighboring populations, each of which can interbreed with next-door populations. The two end populations in the series are too distantly related to interbreed. The existence of sympatric speciation as a mechanism of speciation was hotly contested. This is called anagenesis: species by changing, or 'phyletic evolution'. Darwin thought most species arose directly from pre-existing species.The Hawaiian islands plus former islands which are now beneath the sea make up the Hawaiian–Emperor seamount chain; and many of the underwater mountains are guyots.i have apparently descended from a single ancestral species that colonized the islands, about 20 million years ago. The complex forms a horseshoe shape around the mountains.

He was also a keen naturalist and collector, and it is for this work he is best known among biologists.Such non-breeding-though-genetically-connected 'end' populations may co-exist in the same region, thus closing a 'ring'. People argued that the evidences of sympatric speciation are in fact examples of micro-geographic speciation.Ring species provide important evidence of evolution: they illustrate what happens over time as populations genetically diverge. In general, this is not now the preferred explanation.In turn, that means reproductive isolation is not the best definition of a species, and speciation does not require allopatry (species to be reproductively separated).Isolating mechanisms are things which prevent successful breeding between groups in a species.




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