DDT Residues in an East Coast Estuary: A Case of Biological Concentration of a Persistent Insecticide

Abstract

DDT residues in the soil of an extensive salt marsh on the south shore of Long Island averaged more than 13 pounds per acre (15 kilograms per hectare); the maximum was 32 pounds per acre (36 kilograms per hectare). A systematic sampling of various organisms from the vicinity showed concentrations of DDT increasing with trophic level through more than three orders of magnitude from 0.04 part per million in plankton to 75 parts per million in a ring-billed gull. Highest concentrations occurred in scavenging and carnivorous fish and birds, although birds had 10 to 100 times more than fish. These concentrations approach those in animals dying from DDT poisoning, which suggests that many natural populations in this area are now being affected, possibly limited, by DDT residues. Similar concentrations have been reported elsewhere in North America.

How sustainable agriculture can address the environmental and human health harms of industrial agriculture.

“…A 1967 study found that DDT levels were 20,000 times higher in one fish species than they were in the surrounding sea water, and 520,000 times higher in fish-eating cormorants (90). So, when humans eat foods higher on the food chain (more meat, milk, cheese, and eggs and fewer plant foods), they increase their exposure to bioaccumulated pesticides.…”

Nanopartikel in biologischen Systemen

“…Zerstörung der Ozonschicht [214] Polychlorierte Biphenyle [215,216] > 20 Anreicherung in der Nahrungskette [217,218] DDT [b] > 20 Anreicherung in der Nahrungskette; [217,219] verminderte Fruchtbarkeit bei Vögeln [220] Plastik (PE, PP)…”

Nutritional effects ofArtemia from different locations on larval development of crabs

“…WOODWELL et al (1967) have shown that there is usually an increase in concentration of DDT residues from smaller to larger organisms and from lower to higher trophic levels.…”