DDT, Chlordane, Toxaphene and PCB Residues in Newport Bay and Watershed: Assessment of Hazard to Wildlife and Human Health - Reviews of Environmental Contamination and Toxicology - page 103

Table 16 Geometric mean
DDE and DDD residues
(ppm wet wt) in osprey eggs
from Delaware Bay. Data
from Table 1 in Steidl et al.
( 1991b )

DDE DDD

Region
and egg
type

(geometric
mean)

(geometric
mean) n (range) (range)

Delaware Bay
Random 7 3.2 1.7-5.2 0.4 0.3-0.7

Addled 4 2.9 1.6-4.7 0.4 0.3-0.6

All 11 3.1 0.4

Atlantic Coast
Random 8 1.2 0.5-2.8 0.2 0.1-0.6

Addled 4 1.6 1.4-1.8 0.2 0.2-0.3

All 12 1.4 0.2

Maurice River
All 2 1.9 1.6-2.3 0.2 0.2-0.2

Table 17 Eggshell thickness
of random (1989) and addled
(1985-1988) osprey eggs,
and eggshell fragments
(1987-1988), from three
regions of New Jersey. Data
from Table 3 in Steidl et al.
( 1991b )

Eggshell
thickness
(mm)

% Below
pre-1947
thickness a

Region and
shell type n Mean SE Mean SE

Delaware Bay
Random 7 0.444 0.020 12.0 3.9

Addled 8 0.466 0.014 7.8 2.7

Fragment 2 0.430 0.005 14.9 1.0

All types 17 0.453 0.011 10.4 2.1

Atlantic Coast
Random 8 0.485 0.020 4.0 3.9

Addled 22 0.488 0.011 3.3 2.2

Fragment 19 0.472 0.011 6.5 2.1

All types 49 0.482 0.007 4.7 1.4

Maurice River
Random 2 0.490 0.045 3.0 8.9
Fragment 2 0.465 0.005 7.9 1.0
All types 4 0.478 0.020 5.5 3.9
a Compared to data from Anderson and Hickey
( 1972 )

relatively high concentrations of DDT. Finally, these fi sh were caught in 1989
and the eggs were collected from 1985 to 1989. Some decline in fi sh residues from
1985 to 1989 would be expected, based on data from other locations. Given all of
the above, crude bioconcentration factors can be calculated as 5.7/0.54 = 5.7 for the
Delaware Bay, 1.4/0.09 = 15.6 for the Atlantic coast and 1.9/0.095 = 20 for the
Maurice River.
As the level of DDT in fi sh decreased, the bioconcentration factor appears to
have increased. This pattern became even more evident as fi sh residues continued to