. The Biological bulletin. Biology; Zoology; Marine biology. 84 R. K. ZIMMER-FAUST ET AL. water was collected over a sand flat ( m above the sub- stratum) 15 m away from the same bed. The bed was located on a rock face at Goleta Point, within 400 m of the Marine Science Institute. This site was protected from direct wave exposure, though no attempt was made to characterize the hydrodynamic environment at the time that the seawater samples were collected. The bed was a mixed stand of Mytilus californianus, M. galloprovincialis, and Septifer bifurcatus with 2210 (±563 SD) individuals/ m^ as d
. The Biological bulletin. Biology; Zoology; Marine biology. 84 R. K. ZIMMER-FAUST ET AL. water was collected over a sand flat ( m above the sub- stratum) 15 m away from the same bed. The bed was located on a rock face at Goleta Point, within 400 m of the Marine Science Institute. This site was protected from direct wave exposure, though no attempt was made to characterize the hydrodynamic environment at the time that the seawater samples were collected. The bed was a mixed stand of Mytilus californianus, M. galloprovincialis, and Septifer bifurcatus with 2210 (±563 SD) individuals/ m^ as determined by random quadrat sampling (quadrat area: m^; A'^ = 18 replicates). All seawater was col- lected in acid-washed glass containers (1 -1 capacity), each equipped with a glass stem and Teflon stopcock that could be turned open to allow water flow into the vessel. Sea- water samples were filtered to ^m within 10 min of collection, then stored frozen in 25-ml aliquots at -20°C until used in experiments. Lobster behavior was also assayed in response to pu- rified adenosine 5'-triphosphate (ATP). This molecule acts as a chemical signal indicating the freshness and edibility of food and is a potent feeding attractant to spiny lobsters (Zimmer-Faust, 1993). Active and resting lobsters were each tested with ATP at 10 \ 10"*, 10"*, and lO"'" M. Lobsters at rest were tested separately during day (1100- 1500 h) and night (2200-0300 h). The lobsters tested dur- ing the day resided in shelters and were at rest for 4-8 h before the trials. In contrast, lobsters tested at night had emerged from their shelters, walked for at least 10 min, and then come to rest outside the shelters for 15-30 min before trials began. Blue crabs primarily consume infaunal bivalves (Laughlin, 1982), and are extremely voracious predators of Mercenaria (Castagna and Kraeuter, 1977; Sponaugle and Lawton, i 990). Juvenile clams within the size range (sheU length: cm) com
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectb, booksubjectzoology
