Fluorometer Controlled Apparatus Designed for Long-Duration Algal-Feeding Experiments and Environmental Effect Studies with Mussels

Figure 5

Mytilus edulis. Mean individual filtration rate (𝐹, ▲) measured by the fluorometer controlled apparatus (FCA) in 4 groups of mussels (Group I = (a) and (b); Group II = (c), (d), (e), (f), and (g); Group III = (h), (i), (j), (k), and (l); Group IV = (m), see Table 1). The mussels were initially exposed to a relatively low algal (Rhodomonas salina) concentration (△, about 2,300 cells mL⁻¹) to measure the maximum filtration rate, whereupon the algal concentrations were increased to different higher levels as indicated in the subfigures (𝐶, cells mL⁻¹). Supplementary, filtration rates were regularly measured by the clearance rate method (◯, (1)).

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

(i)

(j)

(k)

(l)

(m)