Hypoxia zone and functional group losses in zooplankton community structure

The oxygen in the oceans is decreasing, and this topic is little commented on in scientific studies. The reduction in oxygen occurs mainly in places that receive a greater availability of nutrients, either naturally or anthropically, which increases the excessive proliferation of phytoplankton that develop the hypoxic zones. Hypoxic zones are increasing with the effects of land use and fertilizers, global warming, and climate change among other reasons. In this review, the following were analyzed: 1) hypoxia zone increase associated with natural anthropogenic effects such as: eutrophication, global warming and climate change, 2) the correlation found in pelagic food web with loss of functional group with emphasis on zooplankton community as a response to adaptations in the hypoxia zone. Hypoxia zones have been causing changes in the food web on a global scale, and this effect becomes even more evident if steps are not taken to reduce effluents and environmental imbalances.