Posts tagged sea
Posts tagged sea
White Cliffs, Dover, England.
just another gorgeous North Atlantic sunset
Stormy day on the JR - nearly gale conditions with winds at 35 knots and big swell
A Global Map of Human Impacts to Marine Ecosystems
What happens in the vast stretches of the world’s oceans - both wondrous and worrisome - has too often been out of sight, out of mind.
The sea represents the last major scientific frontier on planet earth - a place where expeditions continue to discover not only new species, but even new phyla. The role of these species in the ecosystem, where they sit in the tree of life, and how they respond to environmental changes really do constitute mysteries of the deep. Despite technological advances that now allow people to access, exploit or affect nearly all parts of the ocean, we still understand very little of the ocean’s biodiversity and how it is changing under our influence.
The goal of the research presented here is to estimate and visualize, for the first time, the global impact humans are having on the ocean’s ecosystems.
Our analysis, published in Science, February 15, 2008 (no subscription required), shows that over 40% of the world’s oceans are heavily affected by human activities and few if any areas remain untouched.
The Manneporte near Étretat (1886) by Claude Monet
Salty cave view on the shores of The Dead Sea, Jordan (by Moro).
Sea of Stars
Photograph by Doug Perrine, Alamy
Pinpricks of light on the shore seem to mirror stars above in an undated picture taken on Vaadhoo Island in the Maldives.
The biological light, or bioluminescence, in the waves is the product of tiny marine life-forms called phytoplankton—and now scientists think they know how some of these sea beasts create their brilliant blue glow.
Various species of phytoplankton are known to bioluminesce, and their lights can be seen in oceans all around the world, said marine biologist and bioluminescence expert Woodland Hastings of Harvard University. (Also see“Glowing Sea Beasts: Photos Shed Light on Bioluminescence.”)
“I’ve been across the Atlantic and Pacific, and I’ve never seen a spot that wasn’t bioluminescent or a night that [bioluminescence] couldn’t be seen,” Hastings said.
The most common type of marine bioluminescence is generated by phytoplankton known as dinoflagellates. A recent study co-authored by Hastings has for the first time identified a special channel in the dinoflagellate cell membrane that responds to electrical signals—offering a potential mechanism for how the animals create their unique illumination.