Figure 6.

Mean feeding ratio of the different larval populations ± SD (n ≥ 6). Larvae were incubated either in PERL chambers or with or without serum, and with or without CO₂ (for detailed overview of populations refer to Table 1). The percentage of feeding larvae was determined after 24 h and 48 h, respectively, using FITC-BSA as described for the serum-stimulation protocol. For each setup, at least 50 live larvae were examined for uptake of FITC-BSA. *: statistically significant difference (p ≤ 0.05); n.s.: not significant; †: no data since most of the larvae died.