ScienCentral News
 
environment general science genetics health and medicine space technology February 28, 2003 
home NOVA News Minutes archive login

is a production of
ScienCentral, Inc.
Making Sense of Science

Also of Interest
Climate Change and Snow (video)

Tsunami Warning (video)

Strong Stuff (video)

Fishing for Trouble (video)

Sinking City (video)

Shifting Seas (video)

Harry Potter’s Owl (video)

Fallout Fears (video)

Cloned Cuisine (video)

Andrew + 10 (video)

Hurricane Heralds (video)

A Glow in the Deep (video)

Lawn Gone (video)

Mad Deer Disease (video)

Hurricane Spotter (video)

NOVA News Minutes
Visit the NOVA News Minutes archive.
ScienCentral News and Nature
Nature genome promo logo
Don’t miss Enter the Genome
our collaboration with Nature.
Best of the Web!
Popular Science Best of the Web 2000
Selected one of Popular Science’s 50 Best of the Web.
Get Email Updates
Write to us and we will send you an email when a new feature appears on the site.
Fish Out of Water (video)
May 24, 2002

Interviewee: Kenneth Rose, LSU.

Video is 1 min 34 sec long. Please be patient while it loads enough to start playing. Requires the free QuickTime plug-in.


download realplayer logo
If you prefer to view the movie with RealPlayer, click here.

Produced by Brad Kloza


Copyright © Center for Science and the Media, with additional footage from Chesapeake Bay Foundation, NOAA, Maryland Sea Grant, the Pacific Institute and the Audubon Society.

Also on ScienCentral News

Wet Water Shortage (video) - How could a prediction of more rain lead to worries about less water? It’s something else we can blame on global warming. (11/8/01)

Tuna Tracker (video) - Scientists from the Monteray Bay Aquarium are using satellites to track endangered bluefin tuna. (9/4/01)

Elsewhere on the web

"Trout & Salmon Streams Face Sharp Declines Due to Hotter Temperatures" - recent study by the Defenders of Wildlife and the Natural Resources Defense Council.

Chesapeake Bay Foundation

Maryland Sea Grant

EPA Global Warming site


With estimates of a global temperature increase of between 3 and 10 degrees over the next century, many people are simply planning to turn up the air conditioner. But what if you’re a fish?

As this ScienCentral News video reports, it might not be land-dwellers, but those who live underwater that will be the first to feel the heat.


The Ripple Effect

As temperatures in the atmosphere rise, scientists expect the Earth’s aquatic system to be affected by more than just a corresponding rise in water temperature. One of the reasons global warming can be so confusing and controversial is that its effects can be myriad, but subtle, and even contradictory.

For instance, one definite concern of scientists is that cool- and cold-water species of marine life (such as trout) could disappear from certain waters, especially those at the southern boundaries of their habitat ranges. In that sense, the blue crabs of Chesapeake Bay should be fine—increased temperatures isn’t a problem for them. But the rise in the water level that scientists say is a result of global warming is a problem because it’s destroying the tidal marshes and grasslands of the bay. These are important habitats for the crab, particularly during its juvenile stages.

The streamflow of our waters might also change as a result of global temperature rise. If rivers start flowing from mountaintops earlier than usual, fish species like salmon that rely on these rivers during their spawning season could be threatened.

"Aquatic ecosystems depend on receiving certain amounts of water at certain times of year," says Peter Gleick, director of the Pacific Institute for Studies in Development, Environment, and Security. "They depend on certain water temperatures at certain times of year for spawning or for reproducing. They depend on certain kinds of plant life for survival. And ecologists are increasingly concerned that global warming will cause very dramatic impacts on fish and on aquatic ecosystems."

Changes in the level and flow of waters can also affect the salinity of waters near the ocean. Higher estuarine salinity has been cited by the Environmental Protection Agency (EPA) as a cause of declining oyster harvests in Chesapeake and Delaware Bays, and as a cause for wetland loss in Louisiana, Florida, and Maryland.

But sometimes it is simply matter of the rise in the water’s temperature. The EPA has warned that cold water fish habitats could be lost entirely in states like Maine, Massachusetts, Connecticut, Ohio and Nebraska, which would be devastating to those states’ recreational fishing industries. An 8-degree increase in mean annual air temperature could eliminate more than 50 percent of the habitat of the brook trout in the southern Appalachian Mountains.

Jellyfish flourish in unseasonably warm water and tend to adapt well to changes. A recent New York Times article pointed out that in several places around the world jellyfish populations are on the rise, due at least in part to the rise in water temperature. This will further complicate ecosystems because jellyfish compete with other kinds of fish for food. (Also, more people are being stung than ever before, including an Ohio resident who was fatally stung in Australia in March.)

And rising water temperatures is also the main culprit when it comes to coral bleaching, which is becoming alarmingly widespread across the globe. Sometimes referred to as the "rainforests of the sea," coral reefs are important fish habitats. They also protect coastal communities from storms and erosion.

"As we see these changes it should be of great concern," says Kenneth Rose, professor of oceanography at LSU. "We’re changing things that perhaps we cannot reverse, and we’ve not had a good track record in engineering nature to go back to the conditions we thought we wanted.

"I think we’re at a crossroads where there’s two paths we can take. One path is we focus on the uncertainties—what we don’t know—and not do anything until we know everything about everything. The other path, and the one that I hope we take, is that we focus on what we do know and we take a precautionary approach, take action."



by Brad Kloza


About Search Login Help Webmaster
ScienCentral News is a production of ScienCentral, Inc.
in collaboration with the Center for Science and the Media.
248 West 35th St., 17th Fl., NY, NY 10001 USA (212) 244-9577.
The contents of these WWW sites © ScienCentral, 2000-2003. All rights reserved.
The views expressed in this website are not necessarily those of the NSF.
NOVA News Minutes and NOVA are registered trademarks of WGBH Educational Foundation and are being used under license.