Which concept explains how species adapt to differences in available resources?

The ecological species concept is focused on the relationship between species and their environment, emphasizing how species adapt to different ecological niches and available resources. This concept posits that a species is defined not only by its reproductive isolation but also by its role in the ecosystem and how it interacts with other organisms and its habitat. By considering how a species fulfills its ecological role, this concept highlights the adaptability and resource utilization that can lead to the differentiation of species based on the varying resources present in different environments.

In contrast, the biological species concept primarily deals with reproductive isolation and does not account for ecological interactions. The genetic species concept focuses on genetic differences, while the taxonomic species concept categorizes organisms based on hierarchical classifications without emphasizing adaptation to resources. Thus, the ecological species concept is the most suitable explanation for how species adapt to varying resource availability.