Effects of ocean acidification and salinity variations on the physiology of osmoregulating and osmoconforming crustaceans

Author(s)

Ramaglia, Andressa Cristina ^[1] ; de Castro, Leandro Mantovani ^[1] ; Augusto, Alessandra ^{[1, 2]}

Affiliation

^[1] Univ Estadual Paulista, UNESP, Inst Biociencias, Campus Litoral Paulista, BR-11330900 Sao Vicente, SP - Brazil

^[2] UNESP CAUNESP, Ctr Aquicultura, Via Acesso Prof Paulo Donato Castellane S-N, BR-14484900 Jaboticabal, SP - Brazil

• Document type: Journal article
• Source: JOURNAL OF COMPARATIVE PHYSIOLOGY B-BIOCHEMICAL SYSTEMIC AND ENVIRONMENTAL; v. 188, n. 5, p. 729-738, SEP 2018.
• Web of Science Citations: 3

Abstract

Survival, osmoregulatory pattern, oxygen consumption, energy spent on metabolism, ammonia excretion, type of oxidized energy substrate, and hepatosomatic index were evaluated in decapods (an osmoregulating crab, Callinectes danae, and an osmoconforming seabob shrimp, Xiphopenaeus kroyeri) exposed to carbon dioxide-induced water acidification (pH 7.3, control pH 8.0) and different salinities (20, 25, 30, 35, and 40aEuro degrees) for 3 days. Compared to the animals kept at controlled pH, exposure to reduced pH resulted in the loss of osmoregulatory capacity in C. danae at all salinities, except for some hyporegulation at 40aEuro degrees, and reduced oxygen consumption and ammonia excretion at 20 and 40aEuro degrees. Xiphopenaeus kroyeri remained an osmoconformer in all evaluated conditions, except for some hyporegulation at 40aEuro degrees, and when exposed to the reduced pH, it presented changes in oxygen consumption at all salinities and reductions in ammonia excretion at 20 and 35aEuro degrees compared to the control animals. Both species use protein as the main energy substrate and decrease the hepatosomatic index when exposed to reduced pH relative to the control. The observed changes may be associated with changes in the activity of enzymes related to osmoregulation, the use of amino acids as osmotic effectors of cell volume control and recovery, and the Bohr effect, and, because the gills are multifunctional organs related to osmoregulation, the changes may be related to acid-base control, nitrogen excretion, and respiration, with a change in one of these functions bringing about changes in the others. (AU)

• FAPESP's process: 13/26815-0 - Effect of ocean acidification on osmoregulation of the marine shrimp X.kroyeri
• Grantee: Andressa Cristina Ramaglia da Mota
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 14/16983-6 - Effects of ocean acidification and change of temperature and salinity on physiology of the fiddler crabs: a study in laboratory
• Grantee: Alessandra da Silva Augusto
• Support Opportunities: Research Program on Global Climate Change - Regular Grants