Which type of isolation occurs when species breed at different times of the day or year?

Temporal isolation is a reproductive barrier that occurs when species breed at different times, whether that's different seasons, months, days, or even times of the day. This type of isolation can prevent species from mating because they are not sexually active simultaneously, thus reducing the chances of hybridization. For example, two species of frogs may live in the same habitat, but if one breeds in the spring and the other breeds in the summer, they will not encounter one another to reproduce.

Other forms of isolation, such as geographic isolation, involve physical barriers like mountains or rivers that prevent species from coming into contact. Behavioral isolation refers to differences in mating rituals or behaviors that attract mates, while mechanical isolation involves physical differences in reproductive structures that prevent successful mating. Each of these mechanisms can lead to speciation, but temporal isolation specifically highlights the role of time in reproductive success.