Selection favors different traits in captive populations than it does in wild populations, so this may result in adaptations that are beneficial in captivity but are deleterious in the wild. This reduces the success of re-introductions, so it is important to manage captive populations in order to reduce adaptations to captivity.  Adaptations to captivity can be reduced by minimizing the number of generations in captivity and by maximizing the number of migrants from wild populations.  Minimizing selection on captive populations by creating an environment that is similar to their natural environment is another method of reducing adaptations to captivity, but it is important to find a balance between an environment that minimizes adaptation to captivity and an environment that permits adequate reproduction. Adaptations to captivity can also be reduced by managing the captive population as a series of population fragments.  In this management strategy, the captive population is split into several sub-populations or fragments which are maintained separately.  Smaller populations have lower adaptive potentials, so the population fragments are less likely to accumulate adaptations associated with captivity.  The fragments are maintained separately until inbreeding becomes a concern.  Immigrants are then exchanged between the fragments to reduce inbreeding, and then the fragments are managed separately again.