Intertidal resource use over millennia enhances forest productivity

Andrew J. Trant (), Wiebe Nijland, Kira M. Hoffman, Darcy L. Mathews, Duncan McLaren, Trisalyn A. Nelson and Brian M. Starzomski
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Andrew J. Trant: School of Environment, Resources and Sustainability, University of Waterloo
Wiebe Nijland: Hakai Institute, Calvert Island
Kira M. Hoffman: Hakai Institute, Calvert Island
Darcy L. Mathews: Hakai Institute, Calvert Island
Duncan McLaren: Hakai Institute, Calvert Island
Trisalyn A. Nelson: Hakai Institute, Calvert Island
Brian M. Starzomski: Hakai Institute, Calvert Island

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract Human occupation is usually associated with degraded landscapes but 13,000 years of repeated occupation by British Columbia’s coastal First Nations has had the opposite effect, enhancing temperate rainforest productivity. This is particularly the case over the last 6,000 years when intensified intertidal shellfish usage resulted in the accumulation of substantial shell middens. We show that soils at habitation sites are higher in calcium and phosphorous. Both of these are limiting factors in coastal temperate rainforests. Western redcedar (Thuja plicata) trees growing on the middens were found to be taller, have higher wood calcium, greater radial growth and exhibit less top die-back. Coastal British Columbia is the first known example of long-term intertidal resource use enhancing forest productivity and we expect this pattern to occur at archaeological sites along coastlines globally.

Date: 2016
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DOI: 10.1038/ncomms12491

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