• Stephen J. Hawkins
    University of Southampton
  • Ally J Evans
    Southampton UniversityThe Marine Biological Association of the United Kingdom, Plymouth
  • Jon Moore
  • Mark Whittington
  • Kathryn Pack
  • Louise B Firth
    Plymouth University
  • Leoni C Adams
    University of SouthamptonThe Marine Biological Association of the United Kingdom, Plymouth
  • Pippa Moore
    Aberystwyth University
  • Patricia Masterson Algar
  • Nova Mieszkowska
    The Laboratory, Marine Biological Association of the United Kingdom
  • E.C. Southward
The Torrey Canyon was wrecked in 1967 with 117,000 tons of crude oil on board. The Plymouth Laboratory of the Marine Biological Association (MBA) of the UK was mobilized to deal with this environmental catastrophe. Many of the rocky shores affected by the spill and unaffected control sites had been studied by staff from the MBA, with A.J. and E.C. Southward charting fluctuations of rocky shore fauna and flora from the early 1950s – particularly barnacles – in relation to climate. Thus a baseline existed to help judge recovery of rocky shores from the beached oil and application of toxic first generation dispersants. A reminder is given of the initial acute impacts of the oil and its treatment by dispersants, and the first ten years of observations on recovery of shore communities. Subsequent follow-up
work in the 1980s and 1990s suggested recovery took up to 15 years on the shore (Porthleven) subject to the most severe dispersant application. In contrast, recovery occurred in 2-3 years at Godrevy, a site where dispersants were not applied due to concerns about the impact on seals. The dispersants killed the dominant grazer, limpets of the genus Patella, leading to massive subsequent colonisation by seaweeds. The resulting canopy of fucoid algae (“rockweed” or “wrack”) facilitated dense recruitment of limpets. These subsequently
grazed the seaweeds down, before the starving limpets largely died off after migrating across the shore in search of food. This reduction in limpet numbers and grazing pressure then prompted a further bloom of algae. There was then a return to normal levels of spatial and temporal variation of key species of seaweeds and limpets fluctuations charted at Porthleven from the mid 1980s to 2016. Comparisons are made with other oil spills for which long-term
recovery has been assessed. Lessons learnt from observations stretching back 60 years, both before and after the spill, for rocky shore monitoring are highlighted – especially the need for broad-scale and long-term monitoring to separate out local impacts (such as oil spills) from global climate-driven change.

Allweddeiriau

Iaith wreiddiolSaesneg
Nifer y tudalennau30
StatwsCyhoeddwyd - Mai 2017
DigwyddiadInternational oil spill conference - Long Beach, California, Yr Unol Daleithiau
Hyd: 15 May 201718 May 2017
http://www.iosc2017.org/

Cynhadledd

CynhadleddInternational oil spill conference
GwladYr Unol Daleithiau
DinasCalifornia
Cyfnod15/05/1718/05/17
Cyfeiriad rhyngrwyd
Gweld graff cysylltiadau