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

Autor(es)

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

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF COMPARATIVE PHYSIOLOGY B-BIOCHEMICAL SYSTEMIC AND ENVIRONMENTAL; v. 188, n. 5, p. 729-738, SEP 2018.
• Citações Web of Science: 3

Resumo

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)

• Processo FAPESP: 13/26815-0 - O efeito da acidificação oceânica sobre os processos osmorregulatórios do Camarão sete barbas Xiphopenaeus kroyeri (Decapoda, Penaeida
• Beneficiário: Andressa Cristina Ramaglia da Mota
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 14/16983-6 - Avaliação do efeito da acidificação oceânica, aquecimento global e alterações da salinidade sobre a fisiologia de caranguejos do gênero Uca: simulações de cenários futuros em laboratório
• Beneficiário: Alessandra da Silva Augusto
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular