Within the same species, individual organisms can look very different. For all three species of butterflies, wing color and pattern varies depending on the season during which they were born. The ...

Variation within species affects how organisms interact with each other and their surrounding environment. For example, the size of a fish's mouth, known as its gape, ...

The genomic hypothesis offers a second explanation for the decline of within-species variation over time. According to this idea, internal processes in the organism were the key factors.

Intraspecific variation in foundation species such as mangroves (above), corals, and kelp forests serves to maintain ecosystem resilience in the face of a rapidly changing climate. (Photo by Simone ...

Variation within species affects how organisms interact with each other and their surrounding environment. For example, the size of a fish's mouth, known as its gape, ...

The Northern Treeshrew, a small, bushy-tailed mammal native to South and Southeast Asia, defies two of the most widely tested ecological “rules” of body size variation within species, according to a ...

Concerns about biodiversity tend to focus on the loss of species from ecosystems, but a new study suggests that the loss of variation within species can also have important ecological consequences.