Physiological responses of juvenile Chilean scallops (Argopecten purpuratus) to isolated and combined environmental drivers of coastal upwelling

Laura Ramajo, Carolina Fernández, Yolanda Núñez, Paz Caballero, Marco A. Lardies, María Josefina Poupin, Silvana Birchenough

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Coastal biota is exposed to continuous environmental variability as a consequence of natural and anthropogenic processes. Responding to heterogeneous conditions requires the presence of physiological strategies to cope with the environment. Ecosystems influenced by upwelling endure naturally cold, acidic and hypoxic conditions, nevertheless they sustain major fisheries worldwide. This suggests that species inhabiting upwelling habitats possess physiological adaptations to handle high environmental variability. Here, we assessed the impact of the main upwelling drivers (temperature, pH and oxygen) in isolation and combined on eco-physiological responses of Chilean scallop Argopecten purpuratus. A. purpuratus responded to hypoxia by increasing their metabolic performance to maintain growth and calcification. Calcification was only affected by pH and increased under acidic conditions. Further, A. purpuratus juveniles prioritized calcification at the expense of growth under upwelling conditions. Increasing temperature had a significant impact by enhancing the physiological performance of A. purpuratus juveniles independently of oxygen and pH conditions, but this was associated with earlier and higher mortalities. Our results suggest that A. purpuratus is acclimated to short-term colder, acidic and hypoxic conditions, and provide important information of how this species responds to the heterogeneous environment of upwelling, which is significantly relevant in the climatic context of upwelling intensification.

Original languageEnglish
Pages (from-to)1836-1849
Number of pages14
JournalICES Journal of Marine Science
Volume76
Issue number6
DOIs
StatePublished - 1 Dec 2019

Keywords

  • environmental drivers
  • environmental heterogeneity
  • global change
  • metabolism
  • multi-stressor
  • physiology
  • tolerance
  • upwelling

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