"predators like tuna, cod and swordfish have seen their numbers drop by two-thirds over the past century, while small prey fish such as herring, caplin and anchovies have doubled."
Monday, February 21, 2011
Friday, February 18, 2011
"(in some)...specific artisanal and rather unmanaged fisheries of Africa, the use of a wide range of versatile fishing methods and mesh sizes, each of which selects specific sections of a fish community, resulting in a very broad distribution of the fishing pressure on the ecosystem components, leads to high yields while maintaining the ecosystem structure, i.e., the proportions between the abundance of the different size groups. Such “unregulated”, broadly targeted adaptive fishing patterns appear to be far more effective in conserving the ecosystem than single-species management theory predicts. This pattern of development appears to be the result of strong competition between fishers and low individual catch rates, and could be considered analogous to natural predator niche specialization and co-evolution. This requires, obviously, that fishing pressure (using “low tech” gears) remains at levels compatible with the ecosystem productivity."
Wednesday, February 16, 2011
Monday, February 14, 2011
Sunday, February 13, 2011
"Relatively long, at nearly four inches (nine centimeters), the new annelid worm earned its moniker with a head that looks as if it's covered
Its front end bristles with eight arms used for breathing—each as long as the worm's entire body—and two long, loosely coiled appendages employed for feeding.
As if that weren't enough hardware, six pairs of feathery sensory organs—the squid worm's collective "nose"—protrude from the new species' head. And along the length of its body, the worm has iridescent "paddles" for propulsion."