Hydrodynamic Characteristics of Daphnia middendorffiana

✍ Scribed by Marina Patricia Vega; Alejandro Clausse

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 543 KB
• Volume: 83
• Category: Article
• ISSN: 1434-2944
• DOI: 10.1002/iroh.19980830402

✦ Synopsis

Sinking terminal velocities of D. niid~lendoflyiann (with and without tail spine) were measured and correlated with morphological parameters and water temperature. The main dimensions of the body showed positive growths rate correlations with the body weight. In turn, negative allometric variation was observed in the tail-spine length. The density of D. middendo@nnri was age specific, and decreased as the individual grew. No differences in the sinking terminal velocities and trajectories between individuals with and without tail spine were observed. The observed hydrodynamic characteristics of D. middentlorffirmci were simulated by means of a model based on equivalent ellipsoids and spheres. The analysis showed that the effects of shape and the body projections are negligible on the sinking rates of D. middendvfianci.