2006-09-05 10:08:29 · 3 answers · asked by Ronald S 1 in Science & Mathematics ➔ Biology
If true, it would be because of runoff into the ocean. Sea birds aren't generally around areas where DDT is sprayed, because mosquitoes breed in fresh water. So the air around the ocean would be relatively DDT free, whereas the water would contain DDT because of runoff from freshwater rivers.
2006-09-05 10:15:01 · answer #1 · answered by Anonymous · 0⤊ 0⤋
I'm no expert but it's probably to do with the fact that dolphins spend all their time in the water whereas seabirds spend a good deal of time out of it.
My parents ran a wildlife hospital in Wales - mum still does but dad conked out a few years ago. At the time we were the only people in the uk to rescue, treat and release a dolphin. A number of dead porpoises and dolphins were found over the years and sent to the vet lab where it ws found in a few of them that there was a high concentration of ddt's in their systems. Probably the large amount of effluent that is discharged into the sea contributes hugely from sources like sewerage outlets that are in disrepair.
Even birds that lived up in the mountains were found to have pcb's and ddt's in their systems, so rain water could be a big contributor too.
2006-09-05 10:21:01 · answer #2 · answered by diana - b 4 · 0⤊ 0⤋
is it?
2006-09-05 10:13:11 · answer #3 · answered by bubsir 4 · 0⤊ 0⤋