What is a primary reason that hybrid species can complicate the process of speciation?

The process of speciation can be complicated by hybrid species because they can introduce new traits into a population. When hybrid species form from the crossing of two distinct parental populations, they may exhibit a unique combination of traits that are not present in either parent species. This infusion of genetic variation can lead to novel adaptations, which might influence the dynamics of the populations involved.

For example, if hybrid species possess advantageous traits that enhance survival or reproduction in a specific environment, they could lead to shifts in the allele frequencies of a population. Such changes may blur the lines between distinct species, complicating the identification of clear boundaries and thus the definition of species themselves. This process can hinder the establishment of reproductive isolation, which is essential for speciation to occur.

In contrast, other options suggest limitations that hybrids impose or characteristics they may possess. While hybrids can indeed influence gene flow and survival rates, their primary role in the context of speciation is facilitating the introduction of new genetic diversity, which makes them significant in evolutionary dynamics.