Repeat exposure to hypercapnic seawater modifies growth and oxidative status in a tolerant burrowing clam.
J Exp Biol
; 224(13)2021 07 01.
Article
em En
| MEDLINE
| ID: mdl-34027545
ABSTRACT
Although low levels of thermal stress, irradiance and dietary restriction can have beneficial effects for many taxa, stress acclimation remains little studied in marine invertebrates, even though they are threatened by climate change stressors such as ocean acidification. To test the role of life-stage and stress-intensity dependence in eliciting enhanced tolerance under subsequent stress encounters, we initially conditioned pediveliger Pacific geoduck (Panopea generosa) larvae to ambient and moderately elevated PCO2 (920â
µatm and 2800â
µatm, respectively) for 110â
days. Then, clams were exposed to ambient, moderate or severely elevated PCO2 (750, 2800 or 4900â
µatm, respectively) for 7 days and, following 7â
days in ambient conditions, a 7-day third exposure to ambient (970â
µatm) or moderate PCO2 (3000â
µatm). Initial conditioning to moderate PCO2 stress followed by second and third exposure to severe and moderate PCO2 stress increased respiration rate, organic biomass and shell size, suggesting a stress-intensity-dependent effect on energetics. Additionally, stress-acclimated clams had lower antioxidant capacity compared with clams under ambient conditions, supporting the hypothesis that stress over postlarval-to-juvenile development affects oxidative status later in life. Time series and stress intensity-specific approaches can reveal life-stages and magnitudes of exposure, respectively, that may elicit beneficial phenotypic variation.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Água do Mar
/
Bivalves
Limite:
Animals
Idioma:
En
Revista:
J Exp Biol
Ano de publicação:
2021
Tipo de documento:
Article
País de afiliação:
Estados Unidos