A serendipitous meeting with a colleague last year led to a treasure of historical maps of kelp beds off the British Columbia coast, giving geographers a baseline in understanding the ocean’s rainforests. (Maycira Costa/The Canadian Press)

British nautical maps from century ago help B.C. researchers chart kelp beds

Herring use the kelp beds as a deposit for their eggs

A serendipitous meeting between a professor and a colleague last year led to a treasure trove of historical maps indicating kelp bed locations off British Columbia’s coast, helping experts understand the changes in the ocean’s rainforests.

University of Victoria geography Prof. Maycira Costa saw the squiggly lines on the yellowed, hand-drawn map in a picture frame above her colleague’s desk.

The wall art was from 1903 and Costa said her co-worker had found it amongst a pile of old maps in someone’s office.

“I started to look at the details and then I looked at the area that I know of kelp distribution because we are working there with the modern satellite,” she said. “And I looked at that and said, ‘this is kelp distribution.’ “

Using those British admiralty charts from 1858 to 1956, Costa and her research team have now created the first historical digital map of B.C.’s coastal kelp forests.

They’ll use the maps to further investigate the loss of the kelp beds in research supported by Fisheries and Oceans Canada, Canadian Hydrographic Service and the Pacific Salmon Foundation, she said.

“Kelp was considered a navigational hazard so the British carefully annotated all kelp forests on their charts,” Costa said. “And the historical charts increase our understanding of kelp distribution over time.”

READ MORE: 1858 Naval maps combined with satellite data helps researchers map kelp bed health

The kelp forests are known to be an important habitat for several species along the B.C. coast.

Herring use the kelp beds as a deposit for their eggs, crabs, starfish and juvenile salmon also live in the forests, she said.

Kelp also works as a physical barrier to reduce wave action and cut coastal erosion.

“Kelp are the rainforests of the ocean. And they uptake a lot of carbon from the atmosphere of the ocean,” she said.

The province has two types of kelp forests, bull and giant. They grow from shallow areas to depths of about 20 to 25 metres, Costa said.

One of the growing concerns for kelp is warmer water temperatures but it’s unclear if that equates to loss of the forests.

“That’s the golden question, right?”

Kelp beds are also vulnerable to coastal pollution and increased turbidity from shoreline development, she said.

Communities monitoring the kelp beds along the B.C. coast have indicated loss, and now with the help of the British maps the team will work to compare the ocean forests, she said.

They’ll compare the historical maps with the satellite images from 2002 until 2017, she said.

“A lot of environmental conditions play a role in how successful kelp beds are in specific year. Some areas in the United States documented loss of kelp beds especially when the ocean gets warmer,” Costa said.

The next step is to study kelp beds along the entire B.C. coast to better understand how much was lost, she said.

“We now know where they existed about 100 years ago. So what happened recently?”

Hina Alam, The Canadian Press

Like us on Facebook and follow us on Twitter.

Just Posted

Powder Blues are coming to Mission in June

The group will be ‘Doin’ It Right’ at the Clarke Theatre

Man pleads guilty to Surrey crash that killed two Abbotsford women

Sarah Dhillon and Paige Nagata died following head-on collision on Nov. 4, 2018

Man arrested after police standoff and fire at Abbotsford home

Suspect allegedly breached conditions to not be near victim or her home

PHOTOS: Jungle Book characters come to life in Mission

Students from Creative Edge School of Arts also performed Fiddler on the Roof

Talking about diversity in Mission

Eighth annual Cycling4Diversity ride takes place Friday, ending at Mission City Hall

Killer of Calgary mother, daughter gets no parole for 50 years

A jury found Edward Downey guilty last year in the deaths of Sara Baillie, 34, and five-year-old Taliyah Marsman

Raptors beat Bucks 120-102 to even series at 2-2

Lowry pours in 25 as Toronto moves within two games of NBA Finals

Body of missing snowmobiler recovered from Great Slave Lake

Police confirm the body is that of one of three missing snowmobilers

Toddler seriously injured after falling from Okanagan balcony

RCMP are investigating after a two-year-old boy fell from the balcony of an apartment in Kelowna

Fraser Valley chef sentenced to seven years for million-dollar drug operation

Raymon Ranu has been working as a cook since he was arrested for selling fentanyl and cocaine

Cost jumps 35% for Trans-Canada Highway widening in B.C.

Revelstoke-area stretch first awarded under new union deal

Is vegan food a human right? Ontario firefighter battling B.C. blaze argues it is

Adam Knauff says he had to go hungry some days because there was no vegan food

Winds helping in battle against fire threatening northern Alberta town

Nearly 5,000 people have cleared out of High Level and nearby First Nation

Most Read