There are numerous outcomes to the ecosystems associated with eutrophication environments. Most of these are viewed as unfavorable to the biota which have historically comprised a given habitat. The general types of ecological consequences include: reduction in biodiversity, die-off of certain organisms, reduction in visibility and mobility functions due to biotic overgrowth (which effects can interfere with plant metabolism and with aquatic animal transport); reduction in dissolved oxygen and associated fitness reduction in animals dependent upon oxygen levels. In the case of utter transformation of lakes to bogs and meadows, the ecological consequences are extreme, and result in replacement of an original ecosystem with an entirely different one; such progression occurs in the natural world, although human induced additions of N and P greatly accelerate the progression as compared to a natural landscape evolution. In such accelerated circumstances, organisms may not have the time needed to migrate or adapt to the rapidly altered new environment.