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The members of the two populations are reproductively isolated due to their adaptations to distinct salt concentrations. [6] An example of reproductive isolation due to differences in the mating season are found in the toad species Bufo americanus and Bufo fowleri .
Later the systematics of Symbiodiniaceae was revised, and the distinct clades have been reassigned into several genera. One of them is Durusdinium, which was clade D. Most of these clade groupings comprise numerous reproductively isolated, genetically distinct lineages, exhibiting different ecological and biogeographic distributions. [6]
In plants, this can effectively be a new species, reproductively isolated from its parents, and able to reproduce. Main article: Polyploid Polyploidy is a mechanism that has caused many rapid speciation events in sympatry because offspring of, for example, tetraploid x diploid matings often result in triploid sterile progeny. [ 76 ]
This contact allows for the potential for the exchange of genes, dependent on how reproductively isolated the two populations have become. There are several primary outcomes of secondary contact: extinction of one species, fusion of the two populations back into one, reinforcement , the formation of a hybrid zone , and the formation of a new ...
In the event that an animal uses a different pollination source, plants can become reproductively isolated. [1]: 193 Pollinator isolation is a specific form of sexual isolation. [4] The botanist Verne Grant distinguished between two types of pollinator isolation: mechanical isolation and ethological isolation. [1]: 193 [44]: 75
Peripatric speciation is a mode of speciation in which a new species is formed from an isolated peripheral population. [1]: 105 Since peripatric speciation resembles allopatric speciation, in that populations are isolated and prevented from exchanging genes, it can often be difficult to distinguish between them., [2] and peripatric speciation may be considered one type or model of allopatric ...
The evolutionary process by which biological populations of sexually-reproducing organisms evolve to become distinct or reproductively isolated as species is called speciation. [134] [135] Charles Darwin was the first to describe the role of natural selection in speciation in his 1859 book The Origin of Species. [136]
Genetic divergence is the process in which two or more populations of an ancestral species accumulate independent genetic changes through time, often leading to reproductive isolation and continued mutation even after the populations have become reproductively isolated for some period of time, as there is not any genetic exchange anymore. [1]