Little creatures, big blooms

February 16, 2007

The San Francisco area is well-known for its beautiful waters. In fact, it is one of the most biologically productive areas in the United States’ waters.

But with global warming, says Natural Sciences and Engineering Research Council (NSERC) grantee Vera Pospelova, those waters are going to change. Pospelova studies sedimentary records of dinoflagellates – small plankton creatures, eaten by fish, that depend on the sun for their survival. There are dozens of species of these creatures, but the ones that produce toxic blooms concern her the most.

“From my work in the area, I know there are at least two particular dinoflagellate species – an Alexandrium-type and Lingulodinium polyedrum – that are already in the coastal waters near San Francisco,” says Pospelova, an oceanographer at the University of Victoria. “No one can say for sure, but we think that as the waters get warmer, more of these blooms are going to occur. When they do, they will begin killing some of the fish species and poison the shellfish.”

Dinoflagellates form the basis of the food chain, and their fossil record has been found in sediments as far back as the Triassic period, 250 million years ago. Because they are so sensitive to environmental change, looking at fossil dinoflagellates in the San Francisco area and other coastal areas provides a valuable baseline for predicting how climate change will affect marine life.

Pospelova is looking at dinoflagellates all the way along the western coast of North America, from the south of British Columbia to Baja California, Mexico. Her goal is to publish precise predictions about how dinoflagellate population will change during the next few years, to let fisheries and other coastal industries know what to expect as the waters warm up.

“Humans definitely are impacting our environment, and dinoflagellates are perfect for tracking the effects because they are sensitive to water temperature, the amount of salt in the water, and the amount of nutrients,” she says. “The fossils I study are a good way of tracking the past, so that we can predict the future and be better able to cope with it.”

Source: Natural Sciences and Engineering Research Council

Explore further: Understanding reef systems at the genetic level

Related Stories

Understanding reef systems at the genetic level

September 8, 2015

(—Coral reefs are the most diverse marine ecosystems, biodiversity hotspots now under anthropogenic threat from climate change, ocean acidification and pollution. Efforts are underway to protect and expand shrinking ...

VIMS reports intense and widespread algal blooms

September 1, 2015

Water sampling and aerial photography by researchers at William & Mary's Virginia Institute of Marine Science show that the algal blooms currently coloring lower Chesapeake Bay are among the most intense and widespread of ...

An algorithm to investigate unwelcome plankton

July 8, 2015

Computer scientists at Columbia University will work with oceanographers to understand what has caused an unusual plankton-like species to rapidly invade the Arabian Sea food chain, threatening fisheries that sustain more ...

Recommended for you

Detecting HIV diagnostic antibodies with DNA nanomachines

October 7, 2015

New research may revolutionize the slow, cumbersome and expensive process of detecting the antibodies that can help with the diagnosis of infectious and auto-immune diseases such as rheumatoid arthritis and HIV. An international ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.