. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SCOPE FOR GROWTH OF SUSPENSION-FEEDING INVERTEBRATES 321. Figure 1. Map of the Gulf of Maine showing the location of the two sites—Gull Rock Ledge just off Monhegan Island and Ammen Rock Pinnacle on Cashes Ledge—where Metridium senile and Modiolus mo- diolns were collected. Dotted line represents 100-m depth contour. water in 5-liter horizontal Niskin bottles. The divers held the bottles with one opening facing upstream into the ambient current. While remaining neutrally buoyant to avoid any resuspension of paniculate matter
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SCOPE FOR GROWTH OF SUSPENSION-FEEDING INVERTEBRATES 321. Figure 1. Map of the Gulf of Maine showing the location of the two sites—Gull Rock Ledge just off Monhegan Island and Ammen Rock Pinnacle on Cashes Ledge—where Metridium senile and Modiolus mo- diolns were collected. Dotted line represents 100-m depth contour. water in 5-liter horizontal Niskin bottles. The divers held the bottles with one opening facing upstream into the ambient current. While remaining neutrally buoyant to avoid any resuspension of paniculate matter from the benthos, they then triggered the bottles from the down- stream side. Horizontal current velocity (cm s~') was measured simultaneously with electromagnetic current meters (InterOcean model S4) at the same location and time that the samples were collected. The recorded flow speeds were the averages of measurements of 1- to 5-min duration at 2 Hz (120 data points min~'). The horizontal flux of paniculate food moving past the suspension-feed- ing community was calculated as flux = velocity X POM (Mg POM cm'2 s '). Replicate samples (N = 10) of benthic water from each site were filtered onto preweighed and baked (450°C) GF/F filters, frozen (-20°C), and re- turned to Bigelow Laboratory for Ocean Sciences for a determination of ash-free dry weight (AFDW = organic content) and carbon, hydrogen, and nitrogen (CHN) con- tent. Filters for the calculation of PM and POM were washed with isotonic ammonium formate to remove salts. PM filters were then dried at 60°C for 24 h and weighed. Filters used for measuring POM were weighed and then combusted at 450°C for 6 h, and AFDW was calculated by difference. Filters foi CHN analysis were kept under desiccation until just before analysis, and then freeze-dried again. Samples were combusted in a Control Equipment Corporation (Perkin Elmer) 240 XA elemental analyzer with an automatic sampler in an air-tight box to keep the s
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
