FIG 2.

Differentiation of the CSIC and NDSIC models. (A) Theoretical considerations and hypothetical outcome for connectance when competitor sensing (yellow bars) or environmental sensing (green bars) is the major cue for bacteriogenic toxin production. (B) The empirical connectance in both populations with interaction types in the total and exDNase-producing populations (black bars, GS₄₈; white bars, FSS₂₃). The data indicate a higher connectance in the GS population than in the FSS population, thus giving support for the CSIC model. The rates of neutral (0,0), one way antagonism (0/-), and reciprocal antagonistic interactions (-/-) indicate more reciprocal interactions in the GS population than in the FSS population. This difference is not found in the exDNAse-producing population. (C) Theoretical considerations and hypothetical outcome to a response to a decrease in nutrients when competitor sensing (yellow line) or environmental sensing (green line) is the major cue for toxin production. (D) Responses of the GS and FSS populations to a decrease in nutrient strength and to nutrient complementation, as well as to DNA plates to test for DNA availability and DNase activity. Error bars represent the SEM (n = 3).