. Advances in marine environmental research : proceedings of a symposium. Marine ecology -- Research; Marine ecology. 100- > < 60- o. 4 6 DAYS OF EXPOSURE Figure 11-3. Batch variability in N. obsoletus larval survival upon exposure to "; ppm fuel oil (WAF). NOTE: Experiment "A" employed 1 5 larvae/vial and ran 4 days. Experiment "B" employed 20 larvae/vial and ran 8 days. The range of mortality observed in the 3 replicates run at each concentration is indicated. Static exposures of larval C fornicata ran only three days. No mortality was observed at any o
. Advances in marine environmental research : proceedings of a symposium. Marine ecology -- Research; Marine ecology. 100- > < 60- o. 4 6 DAYS OF EXPOSURE Figure 11-3. Batch variability in N. obsoletus larval survival upon exposure to "; ppm fuel oil (WAF). NOTE: Experiment "A" employed 1 5 larvae/vial and ran 4 days. Experiment "B" employed 20 larvae/vial and ran 8 days. The range of mortality observed in the 3 replicates run at each concentration is indicated. Static exposures of larval C fornicata ran only three days. No mortality was observed at any oil level tested. However, no larvae were observed swimming at "; ppm by day two. Activity was normal at lower oil concentrations. Moreover, the guts of larvae at "; ppm were empty of food by the second day, whereas veligers at lower oil concentrations continued to feed during the three-day experiment. In the flow-through exposure, veligers held at "; ppm also stopped swimming by the second day of the experiment. These larvae were alive but emaciated by day four, and dead by day six. Crepidula fornicata larva had good survival at lower oil levels, although growth rates were affected as discussed below. Gastropod Reproduction Adults of N. obsoletus collected in February, 1976, and October, 1976, deposited their first egg capsules in laboratory control containers on 4/30/76 and 5/6/77, respectively, when the water temperature warmed to approximately 10°C. Sastry (27) also obtained egg capsules at 10*^C from A^. obsoletus collected in January at Beaufort, North Carolina. 142 I. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Environmental Research Laboratory (Narragansett, R. I. ); Jacoff, Francine Sakin. Narragansett, R. I. : Environmental Research Laboratory, Office of R
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