. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. COEXISTENCE OF NUD1BRANCHS 249 in trophic morphology and feeding mechanisms among predators may reflect the diets of these predators within hydroid colonies. The possibility that differences in feeding biology and habitat use help facilitate coexistence among these nudibranchs is considered. Materials and Methods Collection of animals Nudibranchs and colonies of Obelia geniculata were collected from a shallow (4-10 m), kelp bed at Cape Ned- dick, York, Maine, (43° 10' N, 70° 36' W) from Septem- ber, 1988, to September, 1989.
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. COEXISTENCE OF NUD1BRANCHS 249 in trophic morphology and feeding mechanisms among predators may reflect the diets of these predators within hydroid colonies. The possibility that differences in feeding biology and habitat use help facilitate coexistence among these nudibranchs is considered. Materials and Methods Collection of animals Nudibranchs and colonies of Obelia geniculata were collected from a shallow (4-10 m), kelp bed at Cape Ned- dick, York, Maine, (43° 10' N, 70° 36' W) from Septem- ber, 1988, to September, 1989. Kelp blades (Laminaria saccharina and L. digitata) were examined underwater for nudibranchs, individually placed in plastic bags, and brought to the lab. In the lab, four species of nudibranchs (Dendronotus frondosus, Doto coronata, Eubranchus ex- igitus, and Tergipes lergipes) were isolated from the hy- droid colonies, sized to the nearest mm with a dissecting microscope, and separated for different parts of the study. Analysis ofradulae Radulae from four individuals each of D. frondosus, D. coronata, and E. exiguus and seven individuals of T. tergipes were examined. Entire animals w^re dissolved in 10% NaOH for 10-12 h. The radulae were then teased free and placed into 70% ethanol until they were mounted for scanning electron microscopy (SEM). Clean radulae were mounted onto glass coverslips in a drop of distilled water and allowed to air-dry. They were sputter coated with a 200-300 A coating of Au/Pd and viewed with an AMR 1000 Scanning Electron Microscope at 20 kV. Six parameters from three tooth rows from the center of each radula were quantified for each species; the aim was to characterize the morphology of the radula from each nudibranch species. From a dorsal perspective, the width (nm) of the radula and the length (/jm) and width (^m) of the rachidian tooth were measured and the den- ticles on one side of the rachidian tooth were counted (Fig. 1 A). The rake angle
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
