Table 3. Microcystin LR concentrations (ppb wet weight) in marine invertebrate gastrointestinal tissues collected from Tank 3 (high microcystin exposure tank) at various time intervals post-exposure1.
Invertebrate Spp.2 | 24 Hour | 48 Hour | 72 Hour | 7 Days | 14 Days | 21 Days |
Manila clam | 1,324 | 110 | 125 | 295 | 183 | nd3 |
Mussel | 979 | 3.13 | 14.3 | 45 | 64.4 | 30.5 |
Oyster | 102 | 373 | 68.3 | 158 | 122 | 4 |
Dungeness crab | nd | nd | 1.01 | 2.7 | --- | --- |
Red rock crab | nd | nd | nd | nd | nd | nd |
Tegula snail | --- | --- | 170 | 175 | --- | --- |
Seawater in tank5 | 12.4 | 4.6 | 6.1 | nd | nd | nd |
All tanks were flushed continually with clean seawater beginning at 96 H post-exposure.
n = 1 or 2 pooled invertebrates of each species at each sample point, except snails, where n = 7.
nd = microcystin concentration was below minimum detection limits on liquid chromatography-tandem mass spectrophotometry.
--- = not tested.
Average microcystin-LR concentration across the top, middle and bottom of Tank 3 at each time point.