2006-11-06 19:35:39 · 14 answers · asked by Anonymous in Environment
Actually - none.
DDT was blamed for thining peregrine falcon eggshells and this theory was repeated as "fact". This "fact" was then re-published in the book "Silent Spring".
Subsequent study has shown that the peregrine's egg shells were affected by another manmade problem - forced change of diet. As farmers cleared land and encroached on more wild areas, the peregrine's natural diet was affected as their natural food - rabbits, smaller birds, etc - became less available due to the encroachment. When peregrines eat, they also eat the bones (a notable calcium source) and the calcium from the bones goes to make strong eggshells.
Supporting evidence for this theory came from a study of peregrine's eating habits and the "leftovers" found in their nests.
2006-11-06 23:57:39 · answer #1 · answered by Bruce H 3 · 1⤊ 0⤋
DDT
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Peregrine falcons declined precipitously in North America following
World War II (Kiff 1988). Research implicated organochlorine
pesticides, mainly 1,1,1-trichloro-2,2-bis(p-chlorophenyl)-ethane
(DDT), applied in the United States and Canada during this same period,
as causing the decline (for a review, see Risebrough and Peakall 1988).
Use of these chemicals peaked in the 1950s and early 1960s and
continued through the early 1970s. Organochlorines and their
metabolites, including DDT and its principal metabolite DDE (1,1-
dichloro-2,2-bis(p-chlorophenyl)-ethylene), aldrin, dieldrin, and
others, are stable, persistent compounds that are stored in the fatty
tissues of animals ingesting contaminated food (Fyfe et al. 1988).
Peregrine falcons and other animals near the top of the food web,
including ospreys (Pandion haliaetus), bald eagles (Haliaeetus
leucocephalus), and brown pelicans (Pelecanus occidentalis), gradually
accumulated these toxins by eating contaminated prey.
2006-11-07 15:20:16 · answer #2 · answered by sunshine05rose 5 · 0⤊ 1⤋
DDT is the Answer For Radio Trivia
2006-11-07 08:12:53 · answer #3 · answered by Anonymous · 0⤊ 0⤋
DDT, I think. I don't know if it affected the peregrine falcon, but it sure affected all other types of wildlife.
2006-11-07 03:37:33 · answer #4 · answered by catwomanmeeeeow 6 · 0⤊ 0⤋
Radio Trivia - DDT
2006-11-07 05:48:27 · answer #5 · answered by Prettygirl61 5 · 0⤊ 0⤋
DDT.
BUT don't forget ! It saved over 20 million peoples lives worldwide. Don't judge too harshly!
2006-11-07 04:55:28 · answer #6 · answered by andyoptic 4 · 0⤊ 0⤋
Yep, DDT.
2006-11-07 03:38:08 · answer #7 · answered by The Angry Scotsman 3 · 0⤊ 0⤋
DDT IS THE ANSWER FOR O-ROCK AND MIX'S RADIO:-)
2006-11-07 07:44:47 · answer #8 · answered by Anonymous · 0⤊ 0⤋
DDT
2006-11-07 16:25:14 · answer #9 · answered by jmac_598 3 · 0⤊ 0⤋
DDT
2006-11-07 13:34:37 · answer #10 · answered by flowwer_1371 5 · 0⤊ 0⤋