Abstract

Data on colonization of rat carcasses by aquatic insects in riffle and pool areas of a small woodland stream were obtained to elucidate patterns potentially useful for determining the postmortem submersion interval of corpses in flowing water habitats. After 39 days, the carcasses had no visual signs of deterioration in the absence of large scavenging animals. Midge larvae (Diptera: Chironomidae) were the dominant insects colonizing the carcasses. No patterns in numbers of larvae over time were evident, but the diversity of genera increased after 29 days in the riffle. Also, Orthocladius larvae did not begin to colonize the carcasses until after 13 days of submersion in the riffle and after 20 days of submersion in the pool. Although separated only by 20 m, the riffle and pool rats had dissimilar faunal assemblages. This suggests that different indices for determining the postmortem submersion interval of corpses based on midge larvae colonization should be developed for these two habitats. This investigation does not provide replicated data, but does shed light on what may happen to mammalian carcasses placed in a stream at a particular time of the year.

References

1.
Smith
K GV
.
A manual of forensic entomology
.
New York
,
Cornell University Press
,
1986
.
2.
Catts
E P
,
Goff
M L
.
Forensic entomology in criminal investigations
.
Ann Rev Ent
1992
;
37
:
253
-
72
.
3.
Shean
B S
,
Messinger
L
,
Papworth
M
.
Observations of differential decomposition on sun exposed v. shaded pig carrion in coastal Washington state
.
J Forensic Sci
1993
;
38
:
938
-
49
.
4.
Greenberg
B
.
Flies as forensic indicators
.
J Medical Ent
1991
;
28
:
565
-
77
.
5.
Haskell
N H
,
McShaffrey
D G
,
Hawley
D A
,
Williams
R E
,
Pless
J E
.
Use of aquatic insects in determining submersion interval
.
J Forensic Sci
1989
;
34
:
622
-
32
.
6.
Vance
G M
,
VanDyk
J K
,
Rowley
W A
.
A device for sampling aquatic insects associated with carrion in water
.
J Forensic Sci
1995
;
40
:
479
-
82
.
7.
Payne
J A
,
King
E W
.
Insect succession and decomposition of pig carcasses in water
.
J Georgia Ent Soc
1972
;
7
:
153
-
62
.
8.
Bode
R W
.
Chironomidae
. In:
Perckarsky
B L
,
Fraissinet
P R
,
Penton
M A
,
Conklin
D J
, editors.
Freshwater macroinvertebrates of northeastern North America
.
New York
,
Cornell University Press
,
1991
;
225
-
67
.
9.
Sorensen
T
.
A method of establishing groups of equal amplitude in plant sociology based on similarity of species and its application to analyses of the vegetation of Danish Commons
.
Biol Skr K Danske Vidensk Selsk
1948
;
5
:
1
-
34
.
10.
Coffman
W P
,
Ferrington
L C
.
Chironomidae
. In:
Merritt
R W
,
Cummins
K W
, editors.
An introduction to the aquatic insects of North America
.
Dubuque
,
Kendall/Hunt Publishing Company
,
1996
;
635
-
754
.
11.
Hershey
A E
,
Hiltner
A L
,
Hullar
M AJ
,
Miller
M C
,
Vestal
J R
,
Lock
M A
, et al
.
Nutrient influence on a stream grazer: Orthocladius microcommunities respond to nutrient input
.
Ecology
 0012-9658
1988
;
69
:
1383
-
92
.
12.
Sweeney
B W
.
Factors influencing life-history patterns of aquatic insects
. In:
Resh
V H
,
Rosenberg
D M
, editors.
The ecology of aquatic insects
.
New York
,
Praeger
,
1984
;
56
-
100
.
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