Coralline algae as a globally significant pool of marine dimethylated sulfur

Heidi Burdett, Angela Hatton, Nicholas Kamenos

    Research output: Contribution to journalArticlepeer-review

    27 Citations (Scopus)
    3 Downloads (Pure)

    Abstract

    Marine algae are key sources of the biogenic sulfur compound dimethylsulphoniopropionate (DMSP), a vital component of the marine sulfur cycle. Autotrophic ecosystem engineers such as red coralline algae support highly diverse and biogeochemically active ecosystems and are known to be high DMSP producers, but their importance in the global marine sulfur cycle has not yet been appreciated. Using a global sampling approach, we show that red coralline algae are a globally significant pool of DMSP in the oceans, estimated to be ~110 × 1012 moles worldwide during the summer months. Latitude was a major driver of observed regional-scale variations, with peaks in polar and tropical climate regimes, reflecting the varied cellular functions for DMSP (e.g., as a cryoprotectant and antioxidant). A temperate coralline algal bed was investigated in more detail to also identify local-scale temporal variations. Here, water column DMSP was driven by water temperature, and to a lesser extent, cloud cover; two factors which are also vital in controlling coralline algal growth. This study demonstrates that coralline algae harbor a large pool of dimethylated sulfur, thereby playing a significant role in both the sulfur and carbon marine biogeochemical cycles. However, coralline algal habitats are severely threatened by projected climate change; a loss of this habitat may thus detrimentally impact oceanic sulfur and carbon biogeochemical cycling.
    Original languageEnglish
    Pages (from-to)1845–1853
    JournalGlobal Biogeochemical Cycles
    Volume29
    Issue number10
    Early online date30 Oct 2015
    DOIs
    Publication statusPublished - 11 Nov 2015

    Keywords

    • Maerl
    • Dimethylsulphoniopropionate (DMSP)
    • Sulfur cycle
    • Crustose coralline algae (CCA)
    • Dimethylsulphide (DMS)
    • Rhodolith

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