The increased concentration of atmospheric CO2 has caused acidification of ocean waters. Models suggest a scenario in which the pH of the water surface can be reduced to 0.4 unit before and 0.7 unit 2100 to 2250. Although evolutionary processes have shown us numerous examples of adaptation to survival in a variety of habitats, consensus is the negative impact of climate change on vulnerable to ocean acidification bodies. Studies have shown that acidification can affect the physiological mechanisms related to acid base balance, energy balance osmoregulation, chemoreception, excretion, ingestion rate and others. In this context, this study intends to evaluate the effect of ocean acidification on the physiology of osmoregulation Xiphopenaeus kroyeri marine shrimp (Decapoda, Penaeidae), a species widely distributed in Brazil and having migratory pattern throughout the year which probably occurs due salinity variation. The osmoregulatory mechanisms of X. kroyeri will be investigated in animals kept for three days under normocapnia (pH: 8.0) or hypercapnia (pH: 7.3) in the salinities of 20, 25, 30, 35 and 40. Metabolism (by means of oxygen consumption), ammonia excretion, osmolality of the hemolymph and degree of hydration of the tissues will be evaluated. The study of aspects of the physiology of X. kroyeri will be important for understanding the effect of ocean acidification on marine biodiversity and fisheries could provide useful information because it is one of the major fisheries the São Paulo coast.
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