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An example of reproductive isolation due to differences in the mating season are found in the toad species Bufo americanus and Bufo fowleri. The members of these species can be successfully crossed in the laboratory producing healthy, fertile hybrids.
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What is an example of reproductive isolation?
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Reproductive isolation. The environment may impose an external barrier to reproduction, such as a river or mountain range, between two incipient species but that external barrier alone will not make them separate, full-fledged species.
Oct 31, 2023 · Reproductive isolation is a collection of mechanisms, behaviors, and physiological processes that prevent the members of two different species that cross or mate from producing offspring, or which ensure that any offspring that may be produced is not fertile.
Sep 5, 2022 · Reproductive isolation (RI) is a core concept in evolutionary biology and the basis by which biological species are defined. Despite this, the term is used in different ways and efforts to quantify RI from data have used vastly different approaches.
- 10.1111/jeb.14005
- 2022/09
- J Evol Biol. 2022 Sep; 35(9): 1143-1164.
- Heather Scoville
- Mechanical Isolation. Mechanical isolation—the incompatibility of sexual organs—is probably the simplest way to stop individuals from reproducing with each other.
- Temporal Isolation. Different species tend to have different breeding seasons. The timing of female fertility cycles can result in temporal isolation. Similar species may be physically compatible, yet may still not reproduce due to their mating seasons occurring at different times of the year.
- Behavioral Isolation. Another type of prezygotic isolation between species has to do with the behaviors of the individuals, and, in particular, the behaviors around mating time.
- Habitat Isolation. Even very closely related species have preferences regarding where they live and where they reproduce. Sometimes, these preferred locations for reproductive events are incompatible between species, which leads to what's known as habitat isolation.
In isolation, changes in the gene pool can occur through some combination of natural selection, genetic drift, and founder effect. These factors may produce distinct subpopulations on the different islands. So long as they remain separate (allopatric) we consider them races or subspecies.
For example, reproductive isolation is weak in the early stages of speciation, but changes to strong or complete in later stages of speciation (Figure 2). One or more of the many types...
