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What A Week It Was: Apocadocuments from
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ApocaDocuments (3) matching "ecosystem interrelationships" from this week
[see full week] ~ [see all stories tagged "ecosystem interrelationships"]
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Thu, Jun 30, 2011
from EcoHearth:
Eerily Silent Summer Nights: Dead Crickets and Poisoned California Water
I remembered recently reading an article about the top pesticide source that is disrupting aquatic life in the Sacramento San Joaquim Delta, which supplies water to 23 million Californians.
The culprits are Pyrethroids, a common synthetic pesticide that researchers first suspected entered the water cycle with agricultural runoff. But the largest quantities actually flow from urban Sacramento and cities in surrounding counties, either from an excessive use of shampoos to eliminate lice and fleas, or from people pouring leftover household pesticides down their drains.
Pyrethroids are linked to neurological and thyroid damage as well as hormonal disruption, and they're extremely harmful to beneficial insects, including bees....
... Borneo where, in the 1950s, the World Health Organization had sprayed roofs with DDT to eradicate malaria. This eliminated mosquitoes as well as the wasps that kept the thatch-eating caterpillars in check, which then thrived and ate the thatched roofs. So the government replaced the roofs with sheet metal, but the pounding rains kept people awake at night. The DDT-killed bugs were eaten by geckos, which were eaten by cats that also eventually died. Then the rats multiplied. Finally, the government had to commission Singapore's Royal Air Force to parachute cats into the country....
Lovins told this story to illustrate how everything is connected. Or as John Muir said, "When we try to pick out anything by itself, we find it hitched to everything else in the universe."
...
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I'm loathe to accept that everything's connected, if that means that I'm responsible for what I do.
ApocaDoc
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Tue, Jun 28, 2011
from New Scientist:
Tasmanian devils were sitting ducks for deadly cancer
Despite its ferocious nature, the Tasmanian devil is a creature faced with extinction, the victim of a gruesome facial tumour disease. Now the first genetic sequencing of these carnivorous marsupials has revealed that we had a hand in their decline: centuries of human interference left the devils stripped of genetic diversity and vulnerable to disease.
This meant that when the parasitic face cancer dubbed "Devil facial tumour disease" appeared in 1996 it rapidly spread through the entire population. As a result, the Tasmanian devil, or Sarcophilus harrisii, population has fallen over 60 per cent since 1996.
The disease is transmitted by physical contact, mostly biting during sex. It is almost always fatal and has spread across most of Tasmania....
Some studies estimate the marsupials could be wiped out within decades....
Humans had a heavy hand in this. First the devils were wiped out in mainland Australia by dingoes brought in by settlers, then those that remained in Tasmania were hunted as pests, causing several population crashes. As their genetic diversity was slashed, the devils were left vulnerable to disease. ...
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We didn't give the devil his due.
ApocaDoc
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Tue, Jun 28, 2011
from The Telegraph:
Warming oceans cause largest movement of marine species in two million years
Warming ocean waters are causing the largest movement of marine species seen on Earth in more than two million years, according to scientists.
In the Arctic, melting sea ice during recent summers has allowed a passage to open up from the Pacific ocean into the North Atlantic, allowing plankton, fish and even whales to into the Atlantic Ocean from the Pacific.
The discovery has sparked fears delicate marine food webs could be unbalanced and lead to some species becoming extinct as competition for food between the native species and the invaders stretches resources....
The highly venomous Portuguese Man-of-War, which is normally found in subtropical waters, is also regularly been found in the northern Atlantic waters....
"In 1999 we discovered a species in the north west Atlantic that we hadn't seen before, but we know from surveys in the north Pacific that it is very abundant there.
"This species died out in the Atlantic around 800,000 years ago due to glaciation that changed the conditions it needed to survive.
"The implications are huge. The last time there was an incursion of species from the Pacific into the Atlantic was around two to three million years ago....
"Large numbers of species were introduced from the Pacific and made large numbers of local Atlantic species extinct. ...
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I like to think of it as species homogenization.
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