1. Habitat Isolation:
Habitat isolation is known as temporal isolation. The isolation process will prevent individual fertilization. The mating period of an individual does not overlap. There are different types of barriers that result in reproduction isolation; they include physical barriers, flowering, and sexual maturing. This isolation happens when two different populations involve in the reproduction cycle and activity periods. For example, two different frogs like wood frogs and leopard frogs undergo mating for different periods, but they do not interbreed. Another example of habitat isolation is between two different pairs of fishes, one fishes belonging to the family Gasterosteidae lives in freshwaters like streams and other fish lives in seawater. They were isolated because they adapt to different salt concentrations; they undergo mating but do not interbreed.
2. Behavioral Isolation:
In behavioral isolation, the process of isolation occurs between two different species with a particular courtship pattern. This courtship depends upon the behavioral isolation; the mating of animals produces isolation; they are termed as behavioral or sexual isolation. This isolation fails to identify the mating partners. The mating choice depends upon the behavior of another species. For example, a male frog prefers to mate with various species, whereas the female rejects to mate with others. Pheromones are a chemical compound responsible for the behavioral or sexual isolation mechanism of insect species. Pheromones were used to identify the related species for mating. The volatile pheromones act as a wide-reaching chemical signal used to contact near species; for example, drosophila contains a mixture of pheromones to contact for mating.
3. Mechanical Isolation:
Mechanical isolation is also a type of isolation mechanism; in this type of mating, animals cannot mate because of incompatibility in genitals. This was first identified by French entomologist Leon Dufour. In mechanical isolation, animals only mate with a related organism with complementary individuals. Mechanical isolation between two species will lead to the development of genital organs through evolution. Mechanical isolation occurs in pollution (the process occurs between plants and insects).
4. Geographic Isolation:
Geographic isolation is also a type of reproductive isolation that occurs between two different populations with different niches or habitats. The closely related species mates with different species in a different habitat. Tiger and lion from different locations cannot mate. Geographic isolation is affected by many factors as follows:
• Isolation by Barriers- For example, the fish from one stream cannot mate with another stream of fish.
• Isolation by Distance- For example, cheetahs from the different group cannot mate with each other, which results in a poor gene pool.
Isolation by Separation- For example, beetles isolated from hills can mate with each other.
5. Gametic isolation:
Gametic isolation is also known as reproductive isolation where eggs and sperms are released by the zygotes that fail to form. The egg does not receive chemical signals from the sperm, so it cannot attach to the egg for fertilization. For example, in urchins, the protein will bind to the egg of the same species but not fertilize. The mechanism of gametic isolation is as follows:
• Biochemical barrier- Sperm cannot travel to the egg and also recognize the receptor
• Chemical incompatibility-The sperm cannot tolerate conditions in the female reproductive tract.
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