Kane: Spatial and temporal abundance patterns of Centropages hamatus 
89 
Table 1 (continued) 
MAB SNE GBK GOM 
Mid- Log Mid- Log Mid- Log Mid- Log 
Yr 
no. 
day 
mean 
SE 
Yr 
no. 
day 
mean 
SE 
Yr 
no. 
day 
mean 
SE 
Yr 
no. 
day 
mean 
SE 
83 
48 
323 
0.75 
0.19 
83 
29 
41 
1.44 
0.27 
82 
29 
140 
0.66 
0.23 
84 
50 
298 
0.59 
0.15 
84 
40 
37 
1.31 
0.26 
83 
29 
91 
2.14 
0.24 
82 
34 
208 
2.82 
0.30 
85 
29 
99 
0.21 
0.13 
84 
41 
71 
1.96 
0.30 
83 
41 
158 
2.84 
0.26 
82 
31 
295 
2.57 
0.29 
85 
44 
260 
0.97 
0.20 
84 
48 
133 
3.32 
0.16 
83 
38 
222 
2.74 
0.28 
82 
29 
323 
2.52 
0.30 
85 
37 
306 
0.29 
0.14 
84 
38 
193 
2.12 
0.31 
83 
38 
278 
0.96 
0.27 
83 
28 
21 
1.55 
0.32 
85 
56 
340 
0.21 
0.09 
84 
51 
198 
2.39 
0.28 
83 
42 
334 
1.28 
0.20 
83 
32 
104 
1.70 
0.33 
86 
50 
39 
0.18 
0.08 
84 
31 
211 
1.24 
0.29 
84 
43 
26 
1.07 
0.20 
83 
30 
163 
2.37 
0.32 
86 
44 
112 
0.23 
0.11 
84 
37 
264 
0.51 
0.20 
84 
38 
83 
1.55 
0.23 
83 
36 
233 
2.69 
0.36 
86 
39 
154 
0.49 
0.17 
84 
47 
309 
0.46 
0.17 
84 
42 
138 
2.75 
0.19 
83 
37 
292 
1.95 
0.29 
86 
32 
262 
1.21 
0.27 
85 
38 
35 
1.22 
0.28 
84 
31 
189 
3.19 
0.23 
83 
28 
340 
2.10 
0.26 
86 
45 
303 
0.59 
0.16 
85 
36 
66 
1.69 
0.30 
84 
31 
205 
3.28 
0.25 
84 
29 
21 
1.88 
0.24 
87 
42 
115 
0.48 
0.14 
85 
51 
110 
2.50 
0.26 
84 
35 
221 
2.07 
0.25 
84 
37 
95 
0.90 
0.21 
87 
56 
155 
0.57 
0.15 
85 
51 
142 
2.64 
0.26 
84 
34 
272 
0.83 
0.26 
84 
32 
146 
1.73 
0.32 
87 
55 
259 
0.92 
0.18 
85 
32 
209 
0.34 
0.14 
84 
42 
318 
0.48 
0.16 
84 
25 
210 
4.95 
0.11 
87 
40 
295 
0.85 
0.21 
85 
51 
245 
0.30 
0.09 
85 
50 
29 
1.00 
0.20 
84 
37 
227 
3.33 
0.27 
85 
26 
277 
0.17 
0.12 
85 
29 
79 
1.57 
0.27 
84 
35 
284 
2.37 
0.28 
85 
47 
314 
0.21 
0.12 
85 
42 
100 
1.55 
0.24 
84 
31 
334 
2.12 
0.30 
86 
46 
12 
0.60 
0.18 
85 
43 
137 
1.93 
0.26 
85 
31 
14 
2.08 
0.25 
86 
42 
68 
1.99 
0.27 
85 
48 
214 
2.37 
0.26 
85 
27 
86 
1.56 
0.29 
86 
46 
133 
2.37 
0.29 
85 
44 
254 
1.32 
0.24 
85 
31 
94 
1.20 
0.29 
86 
45 
175 
2.40 
0.28 
85 
33 
289 
0.97 
0.24 
85 
32 
132 
2.01 
0.35 
86 
41 
217 
0.73 
0.20 
85 
42 
323 
0.79 
0.18 
85 
45 
235 
2.78 
0.29 
86 
47 
243 
0.15 
0.08 
86 
43 
22 
0.85 
0.17 
85 
36 
258 
2.02 
0.35 
86 
40 
263 
0.06 
0.06 
86 
31 
88 
2.41 
0.27 
85 
32 
297 
1.76 
0.34 
86 
47 
311 
0.11 
0.08 
86 
41 
138 
2.48 
0.24 
85 
29 
328 
2.00 
0.35 
87 
47 
10 
1.45 
0.24 
86 
31 
189 
2.88 
0.31 
86 
31 
35 
2.17 
0.28 
87 
46 
87 
2.74 
0.25 
86 
37 
213 
1.51 
0.27 
86 
25 
102 
1.75 
0.37 
87 
51 
105 
3.53 
0.15 
86 
42 
252 
1.29 
0.24 
86 
31 
150 
1.95 
0.30 
87 
58 
129 
2.90 
0.20 
86 
36 
278 
0.96 
0.24 
86 
24 
197 
4.63 
0.20 
87 
29 
193 
1.27 
0.31 
86 
43 
316 
1.56 
0.23 
86 
36 
237 
3.70 
0.23 
87 
48 
234 
0.79 
0.19 
87 
42 
28 
1.68 
0.20 
86 
31 
260 
2.62 
0.31 
87 
37 
261 
0.27 
0.11 
87 
37 
100 
2.45 
0.24 
86 
26 
293 
2.14 
0.32 
87 
46 
311 
0.35 
0.13 
87 
38 
110 
2.97 
0.19 
86 
31 
328 
1.68 
0.29 
87 
53 
134 
1.55 
0.24 
87 
30 
37 
1.74 
0.24 
87 
46 
149 
1.84 
0.23 
87 
26 
113 
1.31 
0.29 
87 
37 
199 
1.23 
0.24 
87 
30 
140 
1.48 
0.30 
87 
43 
239 
0.98 
0.21 
87 
37 
217 
2.70 
0.31 
87 
36 
273 
1.39 
0.27 
87 
29 
248 
3.05 
0.35 
87 
43 
323 
0.75 
0.18 
87 
31 
280 
1.86 
0.30 
87 
29 
342 
1.17 
0.27 
Temperature Centropages hamatus was found at 
station locations where surface temperatures ranged 
from -0.5°C to 28.7°C and where the average water 
column temperatures were between 0.2 and 24.6°C. 
Although the copepod can tolerate a wide range of tem- 
peratures, abundance was greatest at stations where 
surface temperature ranged from 12 to 17°C (Fig. 5A). 
The relationship between surface temperature and 
the annual abundance cycle is shown in Figure 3. Ris- 
ing temperatures in the MAB during summer may be 
responsible for a rapid decline of Centropages hamatus 
there. The population nearly disappears during late 
summer as surface temperature reaches annual maxi- 
mums. The July correlation coefficient between vari- 
ables indicates a strong inverse relationship (P<0.01). 
Centropages hamatus density remains low until the 
mean surface temperature falls below 15°C in Decem- 
ber. Abundance in the more northern subareas slowly 
declines after the annual temperature high is reached. 
Unlike that for the population in the MAB, abundance 
in these subareas does not increase as temperatures de- 
cline in the fall, but only with spring warming (Fig. 3). 
Monthly correlations between Centropages hama- 
tus station abundance and temperature variables 
