There are two species of larkspur that have two different size flowers; Delphinium decorum has large fully opened flowers and Delphinium nudicaule which has small bud like flowers.These two species are both fertilized by insects but they cannot be fertilized by the same type of insect because the smaller flower of D.nudicaule will not permit larger insects to reach the nectar of the flower and the larger flower of the D.decorum is typically fed on by larger insects.Which type of isolating mechanism would this be?

Question

Quizplus · Accepted Answer

Since it is not possible for fertilization to occur because of an inability of insects to transfer pollen between the two species of larkspur this is a form of mechanical isolation, Post zygotic would occur after fertilization happens. Temporal isolation is based on differences in timing of reproduction. Habitat isolation refers to species that live in different areas of the ecosystem and behavioral isolation is based on signals that pass between the male and female to determine whether or not they will mate.Bloom's

There Are Two Species of Larkspur That Have Two Different