

Table 4. Simple linear regression equations of residues (Y) from both replicates with time (X). 


Regression equations® 


Correlations: 
Level soils with 
Compounds (kg) Soils Sig. Earthworms Sig.’ earthworms Sig. 
Dieldrin 0.56 Y = —0.72694 + 0.01322X NS Y= _ 1.00596 —0.03052X% re — (),287 NS 
2.24 Y = — 0.22681 + 0.01398X NS Y= _— 1.46456 —0.02553X e —0.314 NS 
8.97 Y= 0.57444 —0.00043X NS Y= _— 1.68649 —0,.01055X NS 0.156 NS 
p.p'-DDT 0.56 Y= —(0).64950 — 0.00611 NS = Y= —0.30350 — 0.04994X =" — 0.292 NS 
2.24 Y = —0.27302 + 0.00711X NS Y= -—0,02424 —0.05441X ‘on — 0.340 NS 
8.97 Y= 0.37482 + 0.01031X NS Y= 0.91635 —0.06600X% “ — 0.299 NS 
p.p'-DDE 0.56 Y = — 1.92519 + 0.03072X fs Y = —0.12739 — 0.00841X NS — 0.219 NS 
2.24 Y= — 1.64113 + 0.05248X ** Y= 0.37042 —-0.00161X NS 0.080 NS 
8.97 Y = — 1.16329 + 0.04621X ™ Y= 0.87287 —0.00481X NS -—0.129 NS 
o,p'-DDT (soils)& 0.56 Y = — 1.39951 —0.00500X NS Y= _ 0.50684 —0.03981X at 0.067 NS 
p.p'-DDD 
(earthworms) 2.24 Y = — 0.93849 + 0.00627X NS Y= _ 0.80522 —0.01795X : — 0.154 NS 
8.97 Y = — 0.23921 + 0.00145X NS Y= _— 1.60045 —0.02118X ‘i — 0.064 NS 
DDD + DDT 0.56 Y = — 0.67322 —0.00194X NS Y= _ 0.57562 —0.03987X = — 0.044 NS 
2.24 Y = — 0.18589 + 0.00712X NS Y= _ 0.88494 —0.02109X “ —0,239 NS 
8.97 Y= 0.47102 + 0.00883X NS Y= _ 1.71160—0,.02654X rt — 0.219 NS 
DDE + DDD + 
DDT 0.56 Y = — 0.62831 + 0.00056X NS Y= _ 0.67898 —0.03265X > — 0.070 NS 
2,24 Y = —0.18901 + 0.01237X% NS Y= _ 1.03434 —-0.01671X ; —0.313 NS 
8.97 Y= 0.48722 + 0.01005X NS Y= __ 1.78033 —0.02312X Ka ~ 0,222 NS 
Heptachlor 0.56 Y= —1.18115 —0.04345xX ** Y= 1.02451 —0.11172X — 0,667 ay 
2,24 Y = — 0.52267 — 0.04832X mm Y = —0.41837 —0.14330X% 7 0.748 a 
8.97 Y= 0.29725 —0.04592X 7 Y= 0.09885 — 0.16266X rs 0.680 “y 
Heptachlor epoxide 0.56 Y = — 1.49672 + 0.03365X s Y= 0.30742 —0.01430X NS -0.374 NS 
2.24 Y = — 1.13541 + 0,04624X ** Y= 0.71862 — 0.00631X NS -0.209 NS 
8.97 Y = — 1.03703 + 0.07664X vi Y= 0.87777+0,01614X NS 0.525 + 
¥-chlordane 0.56 Y = — 1.39319 + 0.00300X NS Y= _ 0.14264 -0,03691X he 0.107 NS 
2,24 Y= —0.81212 + 0.00016X NS Y= _ 0.43060—0.01411X NS —0.202 NS 
8.97 Y = — 0.37610 +0.01016X NS Y= _ 0.85965 — 0.00282X ‘ 0.053 NS 
Heptachlors 0.56 Y = — 0.74110 —0.00120X NS Y= _ 0.57264 —0.02263X . 0,277 NS 
and chlordanes 2,24 Y = — 0.24065 + 0.00424X NS Y 0.95324 — 0.01179X NS 0.128 NS 
8.97 Y= 0.37337 + 0.00446 NS Y= 1.22772 + 0.00513X NS 0.008 NS 

*Regression equations are of the form Log Y = a + bX:Y = estimated logarithm of residue, and the antilogarithm must be taken to 
convert to the geometric mean, ppm, dry weight; a = constant term; b = regression coefficient; X = time in months after single 
application. 
bSignificant at 5% (*), 1% (**), or not significant (NS). 
eOnly o.p'-DDT was found in soil samples and only p,p'-DDD was found in earthworm samples. 
[Korschgen 1970, 1971] are based on statistical analysis of 
raw data kindly supplied by Mr. Korschgen). No signifi- 
cant loss of dieldrin from soils occurred in either study or 
in a 4l-month study by Caro and Taylor (1971); these 
results were confirmed in our study, Only in the 22-year 
study (Korschgen 1970) did dieldrin in earthworms 
change with time (P < 0.01) or exhibit an elevation- 
trough effect. 
Dieldrin quantities in earthworms were larger in early 
June samples than in April and October samples; earth- 
worm residues in April and October in the 5-year study ex- 
hibited no elevation-trough effect (Korschgen 1971), 
Based on our findings, dieldrin in earthworms should 
increase in April to a late spring-early fall peak and de- 
crease in October to a winter-early spring trough and 
would be expected to be similar. However, dieldrin in 
earthworms in both studies (Korschgen 1970, 1971) varied 
sufficiently that correlations with dieldrin in soils were not 
significant, similar to our findings. Ratios of residues of 
dieldrin in earthworms to residues in soils were largest in 
June of the 22-year study (Korschgen 1970) and differed 
very little in the remaining sampling periods of either 
