Marine Biology

, 166:20 | Cite as

Acute effects of back-to-back hurricanes on the underwater light regime of a coral reef

  • Peter J. EdmundsEmail author
  • Georgios Tsounis
  • Ralf Boulon
  • Lorenzo Bramanti
Short Note


Some of the best-known disturbances affecting coral reefs are storms, yet their impacts on light are poorly known. Here, we describe the underwater light on a reef off St. John, US Virgin Islands (18°18′37.04N, 63°43′23.17W), during two hurricanes and multiple tropical waves that occurred between 17 August 2017 and 30 November 2017. Photosynthetically active radiation (PAR) was recorded at 19-m depth and at the surface, and rainfall was measured as a cause of turbidity affecting underwater light. Hurricanes Irma and Maria reduced maximum daily underwater photosynthetic photon flux density (PPFD) to < 14 µmol photons m−2 s−1 (< 0.001% of surface PPFD) and, from 1 September to 30 November, were associated with rainfall that was higher (107 cm) than has been recorded over this period since 1972. These reductions in underwater PPFD are unprecedented since at least 2014, and the corresponding values of the diffuse attenuation coefficients (Kd-PAR 0.268–0.426) are among the lowest recorded on a coral reef. Our study reveals the capacity for hurricanes to render a photic habitat temporarily aphotic, and over 69 days (and relative to 2016), to contribute to a 20% reduction in summed, daily integrated underwater PPFD. Large reductions in underwater PPFD have negative implications for photosynthetic taxa, but through the turbidity that reduces underwater light, they create opportunities for population growth by suspension feeding invertebrates.



This study was funded by the US National Science Foundation (Grants OCE 18-01336 and DEB 13-50146). We thank S. Prosterman, and V. Powell for logistical support in St. John, the University of the Virgin Islands and the Virgin Islands Ecological Resource Station for infrastructure that made this research possible, and two anonymous reviewers whose comments improved an earlier version of this paper. This is contribution number 282 of the CSUN marine biology program.

Compliance with ethical standards

Conflict of interest

All authors declare that they have no conflict of interest on connection with this study.

Ethical standards

This research was completed under research permits from the VI National Park (most recently VIIS-2018-SCI-0012) and did not involve experimentation with animals or plants.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of BiologyCalifornia State UniversityNorthridgeUSA
  2. 2.St. JohnUSA
  3. 3.Laboratoire d’Ecogeochimie des Environnements Benthiques (LECOB), Observatoire Oceanologique Banyuls sur merSorbonne Universites, UPMC Univ Paris 06, CNRSBanyuls sur merFrance

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