Vulnerability of juvenile hermit crabs to reduced seawater pH and shading

Autor(es)

Ragagnin, Marilia Nagata ^[1] ; McCarthy, Ian Donald ^[2] ; Fernandez, Wellington Silva ^[1] ; Tschiptschin, Andre Paulo ^[3] ; Turra, Alexander ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Oceanog, Praca Oceanog 191, BR-05508120 Sao Paulo, SP - Brazil

^[2] Bangor Univ, Sch Ocean Sci, Askew St, Menai Bridge LL59 5AB, Anglesey - Wales

^[3] Univ Sao Paulo, Escola Politecn, Dept Engn Met & Mat, Av Prof Mello Moraes 2463, BR-05508030 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MARINE ENVIRONMENTAL RESEARCH; v. 142, p. 130-140, NOV 2018.
• Citações Web of Science: 1

Resumo

Multiple simultaneous stressors induced by anthropogenic activities may amplify their impacts on marine organisms. The effects of ocean acidification, in combination with other anthropogenic impacts (apart from temperature) are poorly understood, especially in coastal regions. In these areas, shading caused by infrastructure development, such as harbor construction, may potentially interact with CO2-induced pH reduction and affect invertebrate populations. Here, we evaluated the effects of reduced pH (7.6) and shading (24h in darkness) on mortality, growth, calcification and displacement behavior to live predator (danger signal) and dead gastropod (resource availability signal) odors using juveniles of the hermit crab Pagurus criniticornis collected in Araca Bay (Sao Paulo state, Southeastern Brazil). After a 98 day experimental period, both stressors had a significant interaction effect on mortality, and an additive effect on total growth. No difference in calcification was recorded among treatments, indicating that individuals were able to maintain calcification under reduced pH conditions. When exposed to odor of live predators, crab responses were only affected by shading. However, an interactive effect between both stressors was observed in response to gastropod odor, leading to reduced displacement behavior. This study shows how local disturbance impacts may enhance the effects of global environmental change on intertidal crustacean populations. (AU)

• Processo FAPESP: 15/02727-0 - Efeitos da acidificação oceânica e sombreamento sobre o crescimento, calcificação do exoesqueleto e comportamento de ermitões
• Beneficiário: Marilia Nagata Ragagnin
• Modalidade de apoio: Bolsas no Brasil - Mestrado