It also helps an organism to successfully spread into other environments. Adaptive radiation in Darwin’s Finches: Darwin’s Finches Galapagos Islands are a chain of islands resulting from... 3. It produces more new species, and those species live in a wider range of habitats.. of California Press. The basic body structure, particularly of polychaetes, lends itself to almost endless modification. “Adaptive Radiation refers to the adaptation of an organism that enables them to spread successfully or radiate into other environments.” What is Adaptive Radiation? The term itself was fi rst used by H. F. Osborn in in describing parallel adapta-tions and convergence of species groups on different Adaptive radiation is a rapid increase in the number of species with a common ancestor, characterized by great ecological and morphological diversity. ADVERTISEMENTS: It operates above the species level and results in the splitting of the population of a species into several subgroups, each of which exhibits changes in a definite adaptive direction. Each of which appears to be similar to the corresponding placental mammal. Our mission is to provide an online platform to help students to share notes in Biology. The ancient reptiles gave trials to all sorts of haunts and ways of living. 7. Some definitions phrase it in terms of a single clade: "Adaptive radiation is the rapid proliferation of new taxa from a single ancestral group". Different factors may trigger adaptive radiations, but each is a response to an opportunity. The prototypical example of adaptive radiatio… after the extinction of dinosaurs, mammals quickly diversified and exploited various adaptive zones, As a result of the extinction of competition, species that remain, flourish, e.g. Note also that, according to this scheme, the Oligochaeta have no defining synapomorphies, that is, they are defined solely by retention of plesiomorphies, and thus might be paraphyletic. One common phenomenon of island evolution is adaptive radiation, in which a colonizing species diversifies to produce a wide array of species adapted to many different ecological niches (e.g. Marsupials are one of the most common examples of adaptive radiation. It results in adaptive divergence, An adaptive zone is an unexploited area with numerous ecological opportunities, e.g. Another example of adaptive radiation is the development of different Australian Marsupials from a single ancestral stock in the Australian subcontinent. As marine worms, polychaetes have a wide range of habitats in an environment that is not physically or physiologically demanding. 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