Which of the following mechanisms involves non-overlapping mating seasons?

Temporal isolation is the mechanism that involves non-overlapping mating seasons. This concept refers to the timing of reproduction in different species or populations being asynchronous. For example, if one species breeds in the spring while another breeds in the autumn, they will not mate with each other despite potentially occupying the same habitat. This reproductive isolation is crucial for preventing interbreeding and thus facilitates the process of speciation.

In the context of the other options, structural isolation pertains to differences in physical attributes that prevent mating, ecological isolation relates to species occupying different habitats even in the same geographic area, and geographical isolation involves physical barriers that separate populations (like mountains or rivers). While all of these mechanisms contribute to speciation, temporal isolation specifically addresses the timing of reproductive events, making it the correct choice for this question.