Table 1. Initial mesozoplankton concentration (ind. L−1) and composition in the crude oil exposure experiments conducted in the northern Gulf of Mexico (Stations A, B and MRM) and in the Aransas Ship Channel (AC1 and AC2).
| Taxonomic groups/Category | Stations | ||||
| A | B | MRM | AC1 | AC2 | |
| Calanoid copepods | |||||
| Acartia tonsa | 395 | 7 | 901 | 104 | 73 |
| Paracalanus spp | 379 | 234 | 0 | 32 | 75 |
| Parvocalanus crassirostris | 1 | 0 | 50 | 29 | 8 |
| Calocalanus spp | 3 | 95 | 0 | 0 | 0 |
| Centropages spp | 74 | 3 | 2 | 0 | 0 |
| Euchaeta spp | 0 | 48 | 0 | 4 | 0 |
| Temora spp | 11 | 22 | 0 | 32 | 0 |
| Others | 44 | 69 | 0 | 18 | 5 |
| Cyclopoid copepods | |||||
| Oithona plumifera | 0 | 83 | 0 | 0 | 0 |
| Oithona spp | 30 | 5 | 442 | 36 | 48 |
| Poecilostomatoid copepods | |||||
| Oncaea spp | 27 | 379 | 12 | 0 | 0 |
| Corycaeus sp | 29 | 76 | 0 | 0 | 0 |
| Farranula sp | 0 | 12 | 0 | 0 | 0 |
| Harpacticoid copepods | |||||
| Euterpina acutifrons | 23 | 0 | 4 | 4 | 8 |
| Microsetella sp | 6 | 17 | 0 | 0 | 0 |
| Others | 0 | 0 | 0 | 0 | 3 |
| Copepod Nauplii | 7 | 52 | 10 | 11 | 23 |
| Other holoplankton | |||||
| Oikopleura dioica | 10 | 2 | 0 | 4 | 18 |
| Mysidacea larvae | 17 | 5 | 0 | 0 | 0 |
| Others | 11 | 8 | 0 | 0 | 0 |
| Meroplankton | |||||
| Polychaeta | 0 | 0 | 0 | 32 | 10 |
| Gastropoda | 0 | 10 | 0 | 0 | 38 |
| Cirripedia | 1 | 0 | 8 | 36 | 48 |
| Other larvae | 1 | 2 | 0 | 0 | 8 |
| Total (ind L −1 ) | 1069 | 1129 | 1429 | 342 | 365 |