SFU archaeologist Dana Lepofsky examines clams on a part of Quadra Island riddled with ancient clam gardens.

Ancient clam gardens highly productive, SFU study finds (with video)

Researchers tested prehistoric rock terraces built by First Nations to grow shellfish



Ancient aboriginal clam gardens dramatically boosted shellfish production by pre-contact coastal First Nations, according to new findings by SFU and University of Washington researchers.

Indigenous communities built rock-walled beach terraces to cultivate clams to help feed their burgeoning populations and the SFU-led study tested their effectiveness by transplanting hundreds of baby clams into six ancient clam gardens around Quadra Island.

They found the clams placed in ancient human-constructed terraces grew nearly twice as fast and were more likely to survive than baby clams transplanted into unmodified beaches in the same area.

“We discovered that by flattening the slope of the beach ancient clam gardens expanded the real-estate for clams at the intertidal height at which they grow and survive best,” SFU ecologist Anne Salomon said.

She said traditional knowledge from modern First Nations indicates their ancestors boosted the gardens’ productivity by adding ground clam shell and pebbles to them.”

Four times as many butter clams and twice as many littleneck clams grew in the ancient clam gardens as did on unmodified beaches studied, according to the study published in an online peer-reviewed journal.

SFU archaeologist Dana Lepofsky said it’s fortunate the team had both historic clam gardens to study and traditional cultural knowledge to guide them.

“The lessons learned here have global implications for food security and about the way indigenous people interact with their land and seascapes,” she said.

The study also found some modern shellfish aquaculture practices undermine shoreline ecosystems by altering their composition, changing sediment characteristics and enabling the introduction of invasive species.

Photo above: Archaeologist Dana Lepofsky examines clams on part of Quadra Island riddled with ancient clam gardens.

Slideshow

Just Posted

$3.5M all-season turf field planned for Qualicum Beach

Town seeks grant for community playing surface upgrades

Car theft suspect arrested in Coombs

Vehicle and two motorcyles recovered on Jan. 16

Qualicum Beach council big on support for multi-use cinema proposal

Society asks for 10,000 square feet, gets recommendation to consider with strategic plan

Lincoln stolen from Parksville dealership found near Duncan

Vehicle was located three days later with minor damage

Ballenas student experiment going into space

Science experiment designed by five SD69 students will travel to International Space Station

B.C. opioid crisis to get same world-renowned treatment approach as HIV/AIDS

A program that focuses on treatment as prevention will roll out Jan. 17

In limbo: Leftover embryos challenge clinics, couples

Some are outright abandoned by people who quit paying storage fees and other couples struggle with tough decisions

BREAKING: Jury finds man accused of killing B.C. girl, 12, guilty

Twelve-year-old Monica Jack disappeared in May 1978 while riding her bike along a highway in Merritt, B.C.

B.C. government extends coastal log export rules for six months

Premier John Horgan talks forest policy at loggers’ convention

B.C. pair accused of ‘honour-killing’ in India to be extradited within days

Malkit Kaur Sidhu and Surjit Singh Badesha are accused of conspiracy to commit murder

Netflix rejects request to remove Lac-Megantic images from ‘Bird Box’

At least two shows on Netflix’s Canadian platform briefly use actual footage of the 2013 tragedy

FOCUS: Canada’s revamped impaired driving law brews ‘potential for injustice’

There must be ‘trigger’ for cops to come knocking, Surrey MP says

Barack Obama to speak at Vancouver event

Former U.S. president will speak with board of trade in March

Former welfare clients still owed money, B.C. Ombudsperson says

Investigation found 2,600 people docked illegally for earning income

Most Read