Appendix E. Meta-analysis of the slope of Daphnia clearance rate vs. log food concentrations < 200 µgC/L from eight studies.
TABLE E1. Meta-analysis of the slope of Daphnia clearance rate versus log food concentration for food concentrations < 200 µgC/L from eight studies (see text for study selection criteria). Clearance rates (CR) were scaled to the maximum clearance rate in each experiment (CRi/CRmax). The weighted mean slope was significantly different from 0 at P < 0.04 (t test) or P < 0.01 (Wilcoxon rank test). N = number of food concentrations < 200 µgC/L for each study.
Study |
Range of food concentrations |
Slope |
SE |
N |
Burns and Rigler (1967) |
10–120 |
0.03 |
0.17 |
4 |
DeMott (1982) |
24–146 |
0.02 |
0.23 |
3 |
Henning et al. (1991) |
1–123 |
0.21 |
0.13 |
5 |
Horn (1981) |
9–138 |
0.03 |
0.39 |
4 |
Horton et al. (1979) |
5–123 |
0.21 |
0.05 |
3 |
Philippova and Postnov (1988) |
22–92 |
0.83 |
0.39 |
3 |
Porter et al. (1982) |
21–102 |
0.16 |
0.18 |
3 |
Wiedner (1995) |
1–71 |
0.05 |
0.06 |
3 |
Mean (weighted by 1/SE) |
0.15 |
0.06 |
||
LITERATURE CITED
Burns, C. W., and F. H. Rigler. 1967. Comparison of filtering rates of Daphnia rosea in lake water and in suspensions of yeast. Limnology and Oceanography 12:492–502.
DeMott, W. R. 1982. Feeding selectivities and relative ingestion rates of Daphnia and Bosmina. Limnology and Oceanography 27:518–527.
Henning, M., H. Hertel, H. Wall, and J.-G. Kohl. 1991. Strain-specific influence of Microcystis aeruginosa on food ingestion and assimilation of some cladocerans and copepods. Internationale Revue der gesamten Hydrobiologie 76:37–45.
Horn, W. 1981. Phytoplankton losses due to zooplankton grazing in a drinking water reservoir. Internationale Revue der gesamten Hydrobiologie 66:787–810.
Horton, P. A., M. Rowan, K. E. Webster, and R. H. Peters. 1979. Browsing and grazing by cladoceran filter feeders. Canadian Journal of Zoology 57:206–212.
Philippova, T. G., and A. L. Postnov. 1988. The effect of food quantity on feeding and metabolic expenditure in Cladocera. Internationale Revue der gesamten Hydrobiologie 73:601–615.
Porter, K. G., J. Gerritsen, and J. D. Orcutt, Jr. 1982. The effect of food concentration on swimming patterns, feeding behavior, ingestion, assimilation, and respiration by Daphnia. Limnology and Oceanography 27:935–949.
Wiedner, C., and E. Vareschi. 1995. Evaluation of a fluorescent microparticle technique for measuring filtering rates of Daphnia. Hydrobiologia 302:89–96.