Which of the following best describes a dominant species in an ecosystem?

A dominant species in an ecosystem is one that significantly influences the surrounding environment and the other species within that ecosystem. This influence is often through their abundance, biomass, or the role they play in maintaining certain ecological functions. Such species can dictate the structure and function of the ecosystem by affecting resource availability, habitat structure, and the interactions among other species.

For instance, in a forest ecosystem, tree species that are abundant and provide shade, habitat, and food for other organisms are considered dominant. Their presence shapes the landscape, influences microclimates, and determines which other species can thrive in that environment. By regulating interactions and facilitating or inhibiting other species, the dominant species helps maintain the balance of the ecosystem. This complexity showcases their critical role, distinguishing them from species that have a minimal impact or are sporadic in their presence.