Are you saying that foreign diseases present within a drainage is not of detriment to water quality?
TO WHO? HUMANS OR AMFIBS? HUMANS ARE NOT AFFECTED BY Chytrid fungus or Ranavirus. AS SUCH, IT'S NOT TESTED OR EVEN LISTED UNDER NSF/ANSI 42/53/58 STANDARDS.
Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of these contaminants does not necessarily indicate that the water poses a health risk. (TO HUMANS - I ADDED THAT)
Of course frogs are better water quality indicators than you or ME. They live in the water. I don't.
YOU DRINK IT , COOK WITH IT, EVEN BATH IN IT. WATER PLAYS A BIGGER PART IN YOUR LIFE THAN YOU IMAGINE. FROGS CAN AND DO LIVE IN FAR MORE POLLUTED WATER THAN YOU AND I CAN. THEY ARE TOUGH LITTLE CRITTERS THAT WERE KILLED OFF NOT BY "POLLUTION" OR "CLIMATE CHANGE" BUT BY DISEASE.
THOUSANDS OF FROG autopsies DONE AROUND THE WORLD HAS PROVEN THIS BEYOND ANY DOUBT.
"All the scientists claiming..." Really? ALL? Here's a story in Scientific American: www.scientificamerican.com . It says "[The US Fish and Wildlife Service] released the results of their 10-year study, which examined the rate of amphibian abnormalities on national wildlife refuges. Their paper ... examines more than 68,000 frogs found at 497 wetland sites on 152 refuges. ... Potential causes mentioned in the current paper and in previous research include parasites, UVB radiation, predation (dragonflies or small fish can bite digits off developing amphibian larvae, causing partial regeneration into malformed limbs) or toxic chemicals from agricultural runoff, waste disposal or landfills."
I CALL THOSE "LIST" OR "SHOTGUN" STUDIES - THEY JUST LIST "Potential causes.." BUT NO ACTUAL DATA OR RESULTS THAT CAN BE VERIFIED TO WHICH I ALWAYS ADD "LEPRECHAUNS TO THE LIST. EVEN THOUGH IT'S UNLIKELY, IT DOES MAKE THE LIST COMPLETE SO IT COVERS -EVERY- possibility! AND BESIDES, THEY ARE MAGICALLY DELICIOUS! BASICALLY NO SCIENTIFIC VALUE AND A WASTE OF MONEY AND TIME.
The decline caused by Chytrid is still quite devastating, quite irreversible and obvious to anyone actually looking. What has allowed the spread of this fungus?
SIMPLE - CONTAINER SHIPS - WATER STORED IN THE BILGE IS TRANSPORTED AND DUMPED FROM PLACE TO PLACE -
THE SOLUTION IS ALSO SIMPLE - CHLORINE TABLETS OR UV LIGHTS INSIDE THE BILGE USED AFTER PUMPING IN BALLAST WATER.
BUT BOTH COSTS MONEY...
DENGUE FEVER - INDIA, ZEBRA MUSSELS - RUSSIA, BOTH HAVE ALSO BEEN PROVEN TO HAVE BEEN CARRIED IN BALLAST WATER AS MICROSCOPIC PARASITES.