4.7 Article

Halimeda jolyana (Bryopsidales, Chlorophyta) presents higher vulnerability to metal pollution at its lower temperature limits of distribution

Journal

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 25, Issue 12, Pages 11775-11786

Publisher

SPRINGER HEIDELBERG
DOI: 10.1007/s11356-018-1395-6

Keywords

Photosynthesis; Chloroplast; Ultrastructure; Trace metals; Physiological recover; Distribution limits

Funding

  1. Capes (Higher Education Personnel Improvement Coordination)
  2. CNPq (National Council for Scientific and Technological Development)
  3. REDEALGAS (Brazilian Research Network on Global Climate Change)
  4. Rede de Pesquisa Coral Vivo
  5. FINEP/Rede CLIMA
  6. Boticario Foundation
  7. FAPESC (Foundation support research and innovation in the State of Santa Catarina)

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Seaweeds living at their temperature limits of distribution are naturally exposed to physiological stressors, facing additional stress when exposed to coastal pollution. The physiological responses of seaweeds to environmental conditions combining natural and anthropogenic stressors provide important information on their vulnerability. We assessed the physiological effects and ultrastructural alterations of trace metals enrichment at concentrations observed in polluted regions within the temperature ranges of distribution of the endemic seaweed Halimeda jolyana, an important component of tropical southwestern Atlantic reefs. Biomass yield and photosynthetic performance declined substantially in samples exposed to metal, although photosynthesis recovered partially at the highest temperature when metal enrichment was ceased. Metal enrichment caused substantial ultrastructural alterations to chloroplasts regardless of temperatures. The lack of photosynthetic recovery at the lower temperatures indicates a higher vulnerability of the species at its temperature limits of distribution in the southwestern Atlantic.

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