International team maps world’s giant kelp forests

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The world’s giant kelp forests—vital marine wildernesses as important to Earth’s ecology as rainforests and coral reefs—are being mapped by a team of international scientists.

University of Queensland Ph.D. candidate Nur Arafeh-Dalmau is leading the project to map and identify potential sanctuaries for giant kelp forests, which are increasingly threatened by climate change.

“Marine kelp forests are found off 25 percent of the planet’s coastlines,” Mr Arafeh-Dalmau said.

“They’re one of the most productive and magnificent ecosystems on Earth, but they’re disappearing because of an increase in human activities and marine heatwaves.

The research team analyzed 35 years of satellite data information—identifying areas where giant kelp forests act as potential climate refuges and calculating how much protection is needed.

The mapped region covers thousands of kilometers along the U.S. and Mexico coastline and islands of the Northeast Pacific Ocean.

“We found there’s an alarmingly uneven level of protection of kelp forests inside marine reserves in the region, with less than one percent protected off Mexico’s Baja California coast,” Mr Arafeh-Dalmau said.

“This region is subject to episodes of higher sea surface temperatures and lower availability of nutrients, limiting the kelp’s biomass and spread.”

“Giant kelp is the fastest growing organism on Earth, and when we lose a forest, we’re losing incredible carbon store, habitat for marine biodiversity, breeding grounds for fish stocks and an erosion buffer for coastal communities.

“As marine heatwaves increase in frequency and severity, we need to work out how and where to best protect them.

“We’re working hard on this very problem, monitoring where kelp forests thrive over time and quantifying how much of these persistent kelp habitats are fully protected.”

The research team analyzed 35 years of satellite data information—identifying areas where giant kelp forests act as potential climate refuges and calculating how much protection is needed.

The mapped region covers thousands of kilometers along the U.S. and Mexico coastline and islands of the Northeast Pacific Ocean.

“We found there’s an alarmingly uneven level of protection of kelp forests inside marine reserves in the region, with less than one percent protected off Mexico’s Baja California coast,” Mr Arafeh-Dalmau said.

“This region is subject to episodes of higher sea surface temperatures and lower availability of nutrients, limiting the kelp’s biomass and spread.”

The study methods will now be used worldwide to map the persistence of giant kelp and other canopy forming kelp species in countries like Chile and South Africa, and Australia and New Zealand.

Mr Arafeh-Dalmau believes one of the biggest barriers to kelp forest conservation is the lack of awareness, particularly when compared to similar ecosystems such as coral reefs.

“We need the public and policymakers to know these mysterious underwater forests exist, they’re being threatened globally by human activities, and we need to protect them now,” he said.

Co-author Dr. Fiorenza Micheli from Stanford University said governments needed to ensure 30 percent of oceans were fully protected by 2030, including large portions of kelp forests.

“Protecting persistent kelp forests and determining where forests can act as climate refuges is imperative,” Dr. Micheli said.

“But other measures will be necessary including restoration of degraded kelp forests, identification of genetically resilient kelps for targeted protection and restoration, and a reduction of other anthropogenic stressors like overfishing and pollution.”


Biodiversity is key to kelp forest health


More information:
Nur Arafeh-Dalmau et al, Southward decrease in the protection of persistent giant kelp forests in the northeast Pacific, Communications Earth & Environment (2021). DOI: 10.1038/s43247-021-00177-9

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University of Queensland


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International team maps world’s giant kelp forests (2021, June 11)
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