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Fig. 7. Summary of the neurochemical changes that occur on isolation of gregarious
and crowding of solitarious locusts. (A) Median values (dark blue circles and
line), interquartile range (dark blue region) and 95% data range (light blue
region) for all chemicals analysed, expressed as multiple of the difference
from long-term gregarious values. The inverse values were used for chemicals
that declined in solitarious locusts (cf.
Fig. 3). Outliers (data that
lie more than two interquartile ranges from the median) are shown as circles
and, for citrulline, as triangles. Selected data from Figs
3 and
4 (squares) are also plotted
for comparison with the overall pattern. Optic, optic lobes; thorax, thoracic
ganglia; OA, octopamine; 5-HT, serotonin; DA, dopamine. (B) Median changes in
the amounts of neurochemicals as in A (blue line), plotted against the change
in behavioural phase state associated with the same degrees of isolation and
crowding (stages 1–9; see Fig.
1), expressed as P (solitary) in a logistic regression
behavioural assay (orange, gregarious; green, solitarious). Data for
behavioural phase state taken from Roessingh et al.
(1993) and Roessingh and
Simpson (1994).
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