Negative metal bioaccumulation impacts on systemic shark health and homeostatic balance

Natascha Wosnick, Yuri Niella, Neil Hammerschlag, Ana Paula Chaves, Rachel Ann Hauser-Davis, Rafael Christian Chávez da Rocha, Marianna Basso Jorge, Rayone Wesly Santos de Oliveira, Jorge Luiz Silva Nunes

Research output: Contribution to journalArticlepeer-review

Abstract

Contamination by metals is among the most pervasive anthropogenic threats to the environment. Despite the ecological importance of marine apex predators, the potential negative impacts of metal bioaccumulation and biomagnification on the health of higher trophic level species remains unclear. To date, most toxicology studies in sharks have focused on measuring metal concentrations in muscle tissues associating human consumption and food safety, without further investigating potential impacts on shark health. To help address this knowledge gap, the present study evaluated metal concentrations in the gills, muscle, liver and rectal gland of coastal sharks opportunistically sampled from Brazilian waters and tested for potential relationships between metal bioaccumulation and general shark health and homeostatic balance metrics. Results revealed high metal concentrations in all four tissue types, with levels varying in relation to size, sex, and life-stage. Metal concentrations were also associated with serum biomarkers (urea, lactate, ALT, triglycerides, alkaline phosphatase, and phosphorus) and body condition, suggesting potential negative impacts on organismal health.

Original languageEnglish (US)
Article number112398
JournalMarine Pollution Bulletin
Volume168
DOIs
StatePublished - Jul 2021
Externally publishedYes

Keywords

  • Biomagnification
  • Conservation physiology
  • Ecotoxicology
  • General health
  • Sharks

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science
  • Pollution

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