. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FEEDING AND ENERGETICS OF CRAB LARVAE 203 TABLE III Ingestion rate (I) of 24 hour old zoeae grazing on phytoplankton fGonyaulax grindleyi, Coscinodiscus spp., Thalassiosira spp.) at various cell concentrations ((€}) at 5°C, and percent contribution to respiratory requirement (% R) Cell type Carbon (MgcelP1) (cells r1) I (zoea ' d-') %R' No. cells Mg C G. grindleyi x ID'3 x 103 x 10"2 x 104 x 10 - x 104 X 10 : X 105 X 10-' Coscinodiscus spp. x
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FEEDING AND ENERGETICS OF CRAB LARVAE 203 TABLE III Ingestion rate (I) of 24 hour old zoeae grazing on phytoplankton fGonyaulax grindleyi, Coscinodiscus spp., Thalassiosira spp.) at various cell concentrations ((€}) at 5°C, and percent contribution to respiratory requirement (% R) Cell type Carbon (MgcelP1) (cells r1) I (zoea ' d-') %R' No. cells Mg C G. grindleyi x ID'3 x 103 x 10"2 x 104 x 10 - x 104 X 10 : X 105 X 10-' Coscinodiscus spp. x 10 X 102 X 10"2 X 102 X 10~2 X 102 X 10"2 X 102 X 10 2 X 102 X 10"2 X 102 X 10 2 x 103 X 10 2 X 103 X 10 2 x 103 X 10"' Thalassiosira spp. x 10 x 102 X 10 2 X 103 X 1Q-2 1 Calculation is based on a mean respiratory requirement of an RQ of and an assimilation efficiency of C zoea ' d ' (from Table II), or Thalassiosira experiments since all cells were individually added to, and removed from, the experimental and control vessels and counts were double-checked. DISCUSSION Respiration rates measured at 5°C in this study are lower than those reported for many decapod larvae that inhabit warmer environments (see Mootz and Epi- fanio, 1974; Schatzlein and Costlow, 1978; Levine and Sulkin, 1979). However, the hourly weight-specific rates for stage I C. bairdi zoeae (X = ^1 O2 • mg dry wt~' • IT1) are similar to those of first stage zoeae of Cancer borealis ( ^1 O2) and CO LJ o (cells x 10' FIGURE 1. Relationship between ingestion (I) and average cell concentration ((C)) of G. Grindleyi. The curve was fit using the Holling equation (Holling, 1959). Area of I/(C) observations for large centric diatoms (Fig. 2) shown by box in lower le
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
