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Table 8. Summary of Hudson-Raritan Estuary
scup diet by sampling period during 1996-97, expressed as the percent frequency
of occurrence of dominant prey or items (FO), and as the mean percent contribution
of dominant prey or items to total stomach content volume (TV). (n = sample
size; ES = percent of empty stomachs.) |
|
Prey |
Sampling Period |
|
Jul 96
(n = 58;
ES = 7.0) |
Oct 96
(n = 45;
ES = 4.0) |
Jan 97
(n = 0;
ES = N/A) |
Apr 97
(n = 76;
ES = 1.0) |
Aug 97
(n = 75;
ES = 1.0) |
Nov 97
(n = 0;
ES = N/A) |
|
FO |
TV |
FO |
TV |
FO |
TV |
FO |
TV |
FO |
TV |
FO |
TV |
| Unidentified organic matter |
36.2 |
14.7 |
37.8 |
8.9 |
- |
- |
46.1 |
14.8 |
21.3 |
3.4 |
- |
- |
| Unidentified bivalve remains |
22.4 |
11.2 |
8.9 |
7.3 |
- |
- |
1.3 |
0.4 |
26.7 |
8.0 |
- |
- |
| Gammarus lawrencianus |
48.3 |
20.8 |
17.8 |
10.4 |
- |
- |
0.0 |
0.0 |
0.0 |
0.0 |
- |
- |
| Neomysis americana |
50.0 |
24.4 |
42.2 |
13.5 |
- |
- |
19.8 |
9.2 |
17.3 |
2.8 |
- |
- |
| Crangon septemspinosa |
8.6 |
6.1 |
17.8 |
4.6 |
- |
- |
3.9 |
2.1 |
30.7 |
15.5 |
- |
- |
| Ampelisca abdita |
0.0 |
0.0 |
13.3 |
3.7 |
- |
- |
9.2 |
4.6 |
18.0 |
4.6 |
- |
- |
| Unidentified polychaetes |
6.9 |
4.1 |
6.7 |
2.8 |
- |
- |
35.5 |
15.2 |
9.3 |
2.2 |
- |
- |
| Juvenile Atlantic rock crab |
12.1 |
5.1 |
2.2 |
0.9 |
- |
- |
2.6 |
1.1 |
21.3 |
9.2 |
- |
- |
| Juvenile blue mussel |
1.7 |
0.5 |
2.2 |
0.3 |
- |
- |
31.6 |
10.2 |
1.3 |
0.2 |
- |
- |
| Northern quahog siphons |
1.7 |
1.5 |
13.3 |
7.0 |
- |
- |
0.0 |
0.0 |
17.3 |
9.8 |
- |
- |
| Pagurus spp. |
12.1 |
8.4 |
15.6 |
5.8 |
- |
- |
2.6 |
2. |
13.3 |
5.0 |
- |
- |
| Ensis directus |
1.7 |
1.0 |
0.0 |
0.0 |
- |
- |
1.3 |
7.4 |
13.3 |
8.8 |
- |
- |