In biology, co-adaptation, or coadaptation is the process by which two or more species, traits, organs, or genes undergo adaptation as a pair or group. This occurs when two or more characteristics undergo natural selection together in response to the same selective pressure. While the parts may be functionally independent they are only beneficial when together, sometimes leading to increased interdependence. Coadaptation and its specific examples are often seen as evidence for the broader process of coevolution.
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Species
For example, take note of the relationship that exists between the ant Pseudomymrex ferruginea and the plant Acacia hindsii. This is generally termed coevolution.
Traits
Traits, often at different levels of biological organization. For example, ecophysiology and evolutionary physiology have focused on the coadaptation of behavior with physiology.
Organs
Organs: see the evolution of the eye.
Genes and Gene Complexes
Genes or gene complexes: see Linkage disequilibrium, epistasis