PEARL Paleoecological Environmental Assessment and Research Laboratory

PEARL

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aleoecological

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nvironmental

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ssessment and

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esearch

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aboratory
Queen's University

Biologists find new environmental threat in North American lakes

Boreal Lake - 1

November 24, 2008

Boreal forest lakes suffer from “aquatic osteoporosis,” Queen’s-York research team suggests

Kingston, ON – A new and insidious environmental threat has been detected in North American lakes by researchers from Queen’s and York universities.

Along with scientists from several Canadian government laboratories, the team has documented biological damage caused by declining levels of calcium in many temperate, soft-water lakes.

Calling the phenomenon “aquatic osteoporosis,” Queen’s PhD candidate Adam Jeziorski, lead author of the study, notes that calcium is an essential nutrient for many lake-dwelling organisms. “Once calcium declines below a certain threshold, some keystone species can no longer reproduce,” he says. “These species and other organisms that feed on them are endangered.”

The study is published today in the prestigious journal Science.

The researchers examined a water flea, Daphnia, known to be a key component of many aquatic food webs. Having identified the calcium levels that would damage Daphnia in a laboratory setting, they worked with government scientists to assemble hundreds of “water quality time series” from across the province, explains Biology professor Norman Yan from York University, the Canadian research lead on the threat to aquatic life of calcium decline. “Our hope was to determine if damage was already occurring at key sites, and then see how common these conditions were across the province,” he says.

However, calcium decline occurred in many lakes before people knew about the problem and monitoring programs had been put in place. By studying tiny fossils and other indicators in sediment accumulated at the bottom of each lake, Queen’s paleo-ecologist professor John Smol, Canada Research Chair in Environmental Change, and his colleagues were able to reconstruct environmental trends over the past 200 years.  The researchers found that key invertebrate species were disappearing in the lakes with declining calcium levels, often starting in the 1970s.

Linking the problem to the long-term effects of acid rain on forest soils, as well as to logging and forest re-growth, the researchers note that, despite signs of chemical recovery from recent reductions in sulphur dioxide emissions, lower calcium levels may delay the biological recovery of lakes from acidification. “This has important management implications,” says team member Dr. Andrew Paterson of the Ontario Ministry of the Environment and adjunct professor at Queen’s University. “It was a combination of experimental work, paleo-ecological research and long-term monitoring that helped to identify this emerging threat,” he adds.

The authors conclude that the phenomenon of calcium decline is causing widespread transformation of aquatic food webs in boreal lakes in North America, and in other acid-sensitive regions of the globe. While their work focuses on the water flea Daphnia, they note that all life in lakes requires calcium, and many creatures including crayfish, mollusks and fish have quite high calcium demands. They are all at risk, say the researchers, but we don’t yet know if calcium levels have fallen to the point of damage.

“This is all very worrisome,” concludes Dr. Smol, recipient of the 2004 NSERC Herzberg Gold Medal as Canada’s top scientist and co-director of Queen’s Paleoecological Environmental Assessment and Research Laboratory (PEARL). “The good news is that we have found the ‘miner’s canary’ in the form of these water fleas that track the decline in calcium levels. The bad news is that many lakes have already passed these critical thresholds.”

The research was supported primarily by grants from the Natural Sciences and Engineering Research Council of Canada, as well as funding from the Ontario Ministry of the Environment, Environment Canada and Fisheries and Oceans Canada.

Also on the team are: Anna DeSellas, Kyle McIver, Kristina Arseneau, Brian Ginn and Brian Cumming (Queen’s); Michelle Palmer (York); Michael Turner (Fisheries and Oceans Canada); Dean Jeffries (Environment Canada, National Water Research Institute); Bill Keller (Ontario Ministry of the Environment); and Russ Weeber and Don McNicol (Environment Canada).  

PLEASE NOTE: A PDF copy of the study can be obtained from the Journal Science, or contact Dr. John Smol at smolj@queensu.ca for a copy. High resolution images are available upon request.

 


Contacts:

Nancy Dorrance, Queen’s News & Media Services, 613.533.2869

Molly Kehoe, Queen’s News & Media Services, 613.533.2877

Janice Walls, Media Relations, York University, 416.736.2100 x22101

Attention broadcasters:  Queen’s has facilities to provide broadcast quality audio and video feeds. For television interviews, we can provide a live, real-time double ender from Kingston fiber optic cable. Please call for details.

NOTE:  For high resolution JPEGS related to this paper, Click Here.

Contact Information for authors:

 
John P. Smol
e-mail: smolj@queensu.ca
Telephone: (613) 533-6147
Paleoecological Environmental Assessment and Research Lab (PEARL)
Department of Biology, Queen's University
Kingston, ON, Canada, K7L 3N6
 
Adam Jeziorski
e-mail: 5aj11@queensu.ca
Telephone: (613) 533-6000 x77380
Paleoecological Environmental Assessment and Research Lab (PEARL)
Department of Biology, Queen's University
Kingston, ON, Canada, K7L 3N6
 
Norman D. Yan
e-mail: nyan@yorku.ca
Telephone: (416) 736-2100 x22936
Department of Biology, York University
4700 Keele Stree, Toronto, ON
Canada, M3J 1P3

Telephone: (705) 766-0532
Fax: (705) 766-2254
Ontario Ministry of the Environment
Dorset Environmental Centre
1026 Bellwood Acres Road, P.O. Box 39, Dorset, ON, Canada, P0A 1E0
Andrew M. Paterson
e-mail: andrew.paterson@ontario.ca
Telephone: (705) 766-2951
Ontario Ministry of the Environment
Dorset Environmental Centre
1026 Bellwood Acres Road, P.O. Box 39, Dorset, ON, Canada, P0A 1E0
Anna M. DeSellas
e-mail: anna.desellas@ontario.ca
Telephone: (705) 766-2150
Ontario Ministry of the Environment
Dorset Environmental Centre
1026 Bellwood Acres Road, P.O. Box 39, Dorset, ON, Canada, P0A 1E0
Michael A. Turner
e-mail: michael.turner@dfo-mpo.gc.ca
Experimental Lakes Area
Fisheries and Oceans Canada
501 University Crescent, Winnipeg, MB, Canada, R3T 2N6
 
Dean S. Jeffres
e-mail: dean.jeffries@ec.gc.ca
Telephone: (905) 336-4969
Environment Canada
National Water Research Institute
P.O. Box 5050, Burlington, ON, Canada, L7R 4A6
Bill Keller
e-mail: bkeller@vianet.ca
Telephone: (705) 671-3858
Ontario Ministry of the Environment
Laurentian University
Sudbury, ON, Canada, P3E 2C6
Russ C. Weeber
e-mail: russ.weeber@ec.gc.ca
Telephone: (613) 949-8268
Canadian Wildlife Service (Ontario)
Environment Canada
335 River Road, Ottawa, ON, K1A 0H3
Don K. McNicol
e-mail: don.mcnicol@ec.gc.ca
Telephone: (613) 949-8266
Canadian Wildlife Service (Ontario)
Environment Canada
335 River Road, Ottawa, ON, K1A 0H3
Michelle E. Palmer
e-mail: mepalmer@yorku.ca
Telephone: (416) 736-2100 x20035
Department of Biology, York University
4700 Keele Stree, Toronto, ON
Canada, M3J 1P3
Kyle McIver
e-mail: kylemciver@gmail.com
Paleoecological Environmental Assessment and Research Lab (PEARL)
Department of Biology, Queen's University
Kingston, ON, Canada, K7L 3N6
Kristina Arseneau
e-mail: 4ka2@queensu.ca
Telephone: (613) 533-6000 x77380
Paleoecological Environmental Assessment and Research Lab (PEARL)
Department of Biology, Queen's University
Kingston, ON, Canada, K7L 3N6
Brian K. Ginn
e-mail: b.ginn@lsrca.on.ca
Paleoecological Environmental Assessment and Research Lab (PEARL)
Department of Biology, Queen's University
Kingston, ON, Canada, K7L 3N6
Brian F. Cumming
e-mail: cummingb@post.queensu.ca
Telephone: (613) 533-6153
Paleoecological Environmental Assessment and Research Lab (PEARL)
Department of Biology, Queen's University
Kingston, ON, Canada, K7L 3N6

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