File:American malacological bulletin (1988) (18153181512).jpg

Title: American malacological bulletin
Identifier: americanmal6719881990amer (find matches)
Year: 1983 (1980s)
Authors: American Malacological Union
Subjects: Mollusks; Mollusks
Publisher: (Hattiesburg, Miss. ?) : (American Malacological Union)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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FIG. 12 although neither varied significantly from month to month (Table 2, Fig. 1). The Sandford Island site had a significantly higher silt fraction than did either of the other sites; the Trevor Channel site had the smallest silt fraction. The Mayne Bay site fraction was intermediate, but more similar to that of the Sandford Island site. Thomson (1981) indicated that the organic content of the substratum along Barkley Sound ranges from about 20%
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-0. 07 FIG. 11 Figs. 10-12. Mean proportional abundance of individual prey pooled for all habitats and in the buccal pouches of all the scaphopod species. Mean abundances and 95% confidence intervals of arcsine transformed proportional abundances are shown (sediment, Sed; Cadulus aberrans, C.a.; Dentalium rectius, D.r.; Pulsellum salishorum Ps.). Fig. 10, Rosalina columbiensis; Fig. 11, Florilus basispinatus; Fig. 12, Halacaridan mite eggs. (by weight) in the northeast to about 5% in the southwest. The stations sampled here are consistent with that account (Table 2, Fig. 2). The relationship of sediment particle size distributions and the total volatile solids found at the three stations was complex. The proportion of coarser sediment (smaller phi sizes) varied substantially. A consistent hierarchy was evident; however, in sediment fractions smaller than 250 (phi > 2). The Mayne Bay site had more volatile solids than did the Sandford Island site, which in turn had more than the Trevor Channel site. Most of the particles at each station were also smaller than 250 /<m (Fig. 1), thus the trend was consistent among stations. The relatively high proportion of coarse organic par- ticles at the Trevor Channel site (Fig. 2) is due to substantial kinetic energy input during storms. As a result coarse algal material is ground into the substratum. Observations taken from the submersible PISCES IV confirmed large laminarian kelp fragments on, and partially ground into, the substratum at depths exceeding 90m. Judging by the relative paucity of total volatile solids in the smaller particle size fractions, it is likely these larger particles are being broken down and utilized relatively rapidly, probably as food for infaunal organisms. The infauna at this station were both more diverse and abundant than at the other two sites (Tables 5, 6).

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