Table 2 Mean percentage above the 1-ml l− 1 oxycline (P oxy), weighted mean depth (WMD) and standard deviation for the main taxa off Callao
Taxa | Percentage at surface (P oxy) | Weighted mean deapth (WMD) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
April Station-2 (%) | St. dev. (%) | April Station-5 (%) | St. dev. (%) | August Station-2 (%) | St. dev. (%) | April Station-2 | St. dev. | April Station-5 | St. dev. | August Station-2 | St. dev. | |
Acartia tonsa | 92 | 4.5 | 89 | 8.9 | 88 | 17.4 | 7.9 | 1.6 | 15.0 | 8.2 | 20.1 | 5.3 |
A. tonsa copepodids | 15 | 20.0 | 51 | 37.9 | 58 | 28.6 | 26.7 | 4.6 | 29.1 | 13.3 | 40.1 | 16.3 |
A. tonsa nauplii | 30 | 40.0 | 100 | 0.0 | 81 | 26.2 | 27.1 | 11.1 | 31.2 | 10.6 | 13.1 | 4.6 |
Calanus sp |
| 73 | 27.9 |
|
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Calanus copepodids |
| 70 | 42.1 |
|
| |||||||
Centropages brachiatus | 89 | 21.4 | 75 | 22.9 | 80 | 28.5 |
|
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Eucalanus inermis | 34 | 44.3 | 32 | 29.4 | 36 | 26.9 | 7.6 | 2.5 | 18.7 | 9.8 | 26.3 | 8.5 |
Eucalanus nauplii |
| 18 | 19.9 | 31 | 39.8 | 25.3 | 16.2 | 40.8 | 11.9 | 45.0 | 14.2 | |
Coryceus dubius |
| 80 | 14.4 |
| 39.1 | 14.0 | 49.6 | 7.3 | ||||
Paracalanus parvus | 75 | 16.4 | 68 | 16.8 | 65 | 26.5 | 12.8 | 4.8 | 26.3 | 5.5 | 29.6 | 6.8 |
Hemicyclops thalassius | 53 | 26.3 | 49 | 44.1 | 92 | 10.7 | 20.0 | 4.6 | 20.4 | 5.3 | 40.5 | 14.7 |
Oithona sp. |
| 65 | 13.0 | 69 | 45.5 |
|
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Oncaea venusta |
| 38 | 27.7 | 60 | 37.9 |
| 25.2 | 6.9 | ||||
Discinisca lamellosa larvae | 81 | 30.7 | 71 | 48.1 | 10.6 | 2.7 | ||||||
Limacina sp. | 92 | 20.9 | 46 | 44.1 | 37 | 26.8 | 6.2 | 0.8 | 21.1 | 6.4 | 21.5 | 13.1 |
Magelona sp. larvae | 55 | 37.8 | 50 | 70.7 | 70 | 26.9 | 17.8 | 6.7 | 39.5 | 16.8 | ||
Oikopleura sp. | 97 | 1.6 | 90 | 26.1 | 89 | 21.2 |
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Pleopis polyphemoides | 97 | 2.6 | 7.1 | 2.4 | 11.3 | 8.4 | ||||||
Total zooplankton | 88 | 7.2 | 68 | 12.2 | 67 | 30.8 | 9.4 | 2.3 | 21.9 | 8.0 | 56.6 | 14.1 |