Filtration rates of the Manila clam, Ruditapes philippinarum: dependence on prey items including bacteria and picocyanobacteria
Nakamura, Y. (2001). Filtration rates of the Manila clam, Ruditapes philippinarum: dependence on prey items including bacteria and picocyanobacteria. J. Exp. Mar. Biol. Ecol. 266(2): 181-192. https://dx.doi.org/10.1016/s0022-0981(01)00354-9
In: Journal of Experimental Marine Biology and Ecology. Elsevier: New York. ISSN 0022-0981; e-ISSN 1879-1697, more
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| Keywords |
Ruditapes philippinarum (A. Adams & Reeve, 1850) [WoRMS]
Marine/Coastal |
| Author keywords |
Bivalves; Clearance rates; Filter feeding; Picocyanobacteria |
| Abstract |
The clearance rates (CRs) of the Manila clam, Ruditapes philippinarum Adams et Reeve, were measured for chlorophyll-a (Chl-a) and various potential prey items (bacteria/picocyanobacteria to chain-forming diatoms) at 24 °C in the laboratory. The clams filtered particles actively in 12 out of 16 experimental runs. In these runs, the soft-body-dry-weight (DW)-specific clearance rates (CR*s) for Chl-a were greater than 1.5 dm3 g DW−1 h−1 (average=2.3 dm3 g DW−1 h−1) and comparable to those reported by other groups. Picocyanobacteria (∼1-μm long) and prey items larger than 2 μm were also filtered effectively. However, free-living bacteria (∼0.4-μm long) were filtered in only six runs and the CRs for bacteria were much lower than for other prey items. The ratios of the CR* for each prey item to that for Nitzschia spp. (70–80-μm long) were close to unity for prey longer than 2 μm, which indicates that particles ≥2 μm are filtered with similar efficiency by the clam. For picocyanobacteria and free-living bacteria, these ratios were 0.70 and 0.11, respectively. |
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