Marine metal pollution and effects on seaweed species

Loretto Contreras-Porcia, Andrés Meynard, Camilo López-Cristoffanini, Nicolas Latorre, Manoj Kumar

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

18 Citations (Scopus)

Abstract

Heavy metals are significant pollutants continuously released into the biosphere, both naturally and anthropogenically. Conceptually, metal speciation, bioavailability, and associated toxicity in marine organisms depend on a wide array of abiotic and biotic factors. Among these, pH variation is one of the most important environmental factors influencing metal speciation and toxicity. Due to this, ocean acidification is expected to modify metal speciation, altering the effects these nondegradable contaminants have on marine organisms, such as seaweeds. One clear effect of heavy metals on seaweeds is the rapid formation of reactive oxygen species (ROS). The production of ROS beyond the physiological tolerance threshold causes an oxidative stress condition that, if not attenuated, can irreversibly damage cellular constituents such as DNA/RNA, proteins, and lipids. To cope with heavy metal excess, several mechanisms exist in tolerant seaweed species, including the activation of an efficient ROS-scavenging system constituted by metal-binding compounds, antioxidant enzymes, and oxygenated polyunsaturated fatty acids, among others. Another adaptive mechanism involves the participation of ATP-binding cassette (ABC) transporter proteins in translocating a wide variety of compounds across cell membranes, including heavy metals. In contrast, an excessive heavy metal presence can inhibit photosynthesis, reduce pigment concentration and growth, induce cation losses, and disrupt gametophyte development in non-tolerant seaweed species. In a scenario of lowered ocean pH and increased heavy metal toxicity, the important roles played by non-tolerant seaweed species in structuring communities could be severely compromised, with unknown consequences for associated organisms. Therefore, in the upcoming decades, marine pollution could majorly shift and rearrange community compositions and the distributional ranges of species.

Original languageEnglish
Title of host publicationSystems Biology of Marine Ecosystems
PublisherSpringer International Publishing AG
Pages35-48
Number of pages14
ISBN (Electronic)9783319620947
ISBN (Print)9783319620923
DOIs
Publication statusPublished - 1 Jan 2017

Keywords

  • Heavy metal stress
  • Ocean acidification
  • Seaweeds
  • Tolerance mechanisms

ASJC Scopus subject areas

  • General Agricultural and Biological Sciences
  • General Environmental Science
  • General Biochemistry,Genetics and Molecular Biology
  • General Medicine

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