seaweeds and people and of the canadian west coast by bridgette clarkston
DESCRIPTION
A short intro to seaweeds and their relationship to people (history, uses) for a public workshop in Tofino, B.C. in 2014 for Raincoast Education SocietyTRANSCRIPT
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Seaweeds and PeopleRaincoast Education Society
Tofino, B.C. Canada Dr. Bridgette Clarkston© Bridgette Clarkston 2014
(all images taken by B. Clarkston unless otherwise stated).
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What is a seaweed?
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What is a seaweed?
•aquatic
•marine
•multicellular
•attached
•make their own food
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Brainstorm: how do people use seaweed?
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Brainstorm: how do people use seaweed?
• beer bong / piping
• skipping ropes
• medicine–iodine supplement
• antiseptics
• cultivate lab organisms
• food
• catching herring spawn
• baking supplements in place of gelatin
• carrageenan for cooking
• Turkish towel as toothbrush / washcloth
• garden fertilizer
• mattress stuffing
• art / music
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A global perspective Images: Google search
Images: Google search
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Monte Verde, Chile Images: http://www.pasthorizonspr.com/index.php/archives/10/2011/the-seaweed-trail-peopling-the-americas
Images: http://www.pasthorizonspr.com/index.php/archives/10/2011/the-seaweed-trail-peopling-the-americas
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Japan and Nori
• harvested since 6th century
• for many centuries, nori fishers simply gathered what could find at low tide.
• cultivated since 16th century
Utagawa Hiroshige’s “One hundred famous views of Edo”, #109 (1857)
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Japan and Nori
• harvested since 6th century
• for many centuries, nori fishers simply gathered what could find at low tide.
• harvest and processing into nori sheets done by hand
• cultivated since 16th century
• “pole” method invented 1821
• nets across poles 1930’s
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However, yields remained modest and crops unreliable from year to year…until…
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A connection was made between the Porphyra crop and the work of a scientist far, far away in Britain…
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Seaweeds used in many cultures…
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contemporary uses of seaweeds
Photo: algaebase.org
Photo: algaebase.org
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When did you last use seaweed?
1.In the last 24 hours.
2.In the last week.
3.More than a month ago.
4.Ew, never.
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seaweeds have many uses…
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Can we categorize our list of uses?
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food, a.k.a. “sea vegetables”
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Which is the sushi seaweed?
Photo: algaebase.org
Photo: algaebase.org
Photo: algaebase.org
Photo: algaebase.org
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Pyropia yezoensis, a.k.a. nori
Photo: algaebase.org
Photo: algaebase.org
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B.C. First Nations Group and (or) language family (territory) Name for seaweed (usually Porphyra)
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In general, picked, fermented, dried, compressed, redried, chopped, stored, cooked in myriad of ways…
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Europe
• Porphyra/Pyropia eaten in Wales, Scotland, Ireland, N. England, Norway, Finland.
• Called “laver” or “sloke”
• Pounded, stewed to jelly or mixed with oats…
• 200 tonnes collected annually in Wales until 1980’s (pollution)
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Seaweed nutrition: minerals, Calcium
Dry weight (8g typical serving)
•Ulva 37% RNI*
•Cheddar cheese 5% RNI
* RNI = UK version of recommended daily intake
Kombu/konbu
WakameNoriDulseIrish moss
Sea lettuce
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Seaweed nutrition: minerals, Iron
* RNI = UK version of recommended daily intake
Dry weight (8g typical serving)
•6.4mg Palmaria (dulse)
•1.6mg steak (raw sirloin)
•Bioavailability (absorption and retention unknown for most seaweeds)
•One study found lower bioavailability in Porphyra sp.
Kombu/konbu
WakameNoriDulseIrish moss
Sea lettuce
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Seaweed nutrition:
fatty acids
• Humans require omega-3 and omega-6 fatty acids in diet.
• Seaweeds up to 2% dry weight of lipids, mostly fatty acids.
• In fact, are the producers of the fatty omega-3 and omega-6 fatty acids in fish, shellfish.
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Seaweed nutrition:
vitamins
• Have fat-soluble and water-soluble vitamins
• Produced by seaweed to protect against damage caused by uv light
• One of few plant sources of B12.
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Seaweed nutrition:
protein
• Some species relatively high in protein
• Porphyra/Pyropia can be up to 47% protein (dry weight)*
• Bioavailability improved by “physical processes” or fermentation.
*Varies by season and species
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chemical extracts
Photo: algaebase.org
Photo: algaebase.org
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chemical extracts
Photo: algaebase.org
Photo: algaebase.org
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chemical extracts
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chemical extracts
Photo: algaebase.org
Photo: algaebase.org
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chemical extracts
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Materials
•Bull kelp stipes used by some First Nations for fishing lines, ropes, bulbs as containers.
•Tough stipes of some species used to make beach hockey sticks. Holdfasts carved into round hard balls.
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Where does all the seaweed come from?
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Most is farmed, Nori by far the largest crop
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Wild harvest too, but on smaller scale
Photo: algaebase.org
Photo: algaebase.org
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seaweeds as inspiration
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art – Euthora timburtonii example
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art
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design
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biophilia
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What about biofuels?
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Which examples are new to you? Which is the most interesting to you?
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Future uses and the connection to conservation
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Important to collect sustainably
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• If required, get a license (Alaska, Washington, California)
• Know your limits (10lbs / day wet weight in California)
How to collect seaweeds sustainably
Guidelines from: Jennifer Hahn. 2010. Pacific Feast. Skipstone.
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How to collect seaweeds sustainably
• Don’t pick whole seaweed
• Take from blades well above growing zone (meristem)—on a kelp, this is between stipe and blade
• Use scissors or knife if possible
meristem
cut here
Guidelines from: Jennifer Hahn. 2010. Pacific Feast. Skipstone.
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How to collect seaweeds sustainably
• Don’t pick whole seaweed
• Take from blades well above growing zone (meristem)—on a kelp, this is between stipe and blade
• Use scissors or knife if possible
cut here
Guidelines from: Jennifer Hahn. 2010. Pacific Feast. Skipstone.
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• Collect only a little across the whole bed
• Collect only what you need
• Leave holdfasts
• Be aware of what you’re walking on (don’t crush the animals!)
How to collect seaweeds sustainably
Guidelines from: Jennifer Hahn. 2010. Pacific Feast. Skipstone.
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• Collect only from clean sites
• Be respectful of traditional First Nations’ land
How to collect seaweeds sustainably
Guidelines from: Jennifer Hahn. 2010. Pacific Feast. Skipstone.
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Thank you. Questions?