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Fig. 1. Red knots shift from mono- to diester preen waxes, the latter being more
difficult to detect by a sniffer dog. (A) The shift from mono- to diester
preen waxes (see inset) in spring takes place within 1 month in individual
captive red knots (N=14 individuals; 95% confidence intervals around
mean values of percentage of diesters are indicated by dots). (B) The
likelihood of successful detection is a function of the type and amount of
preen wax. Each data point represents detection success during 20 sessions
(monoesters: black circles, diesters: open circles). Fits from the used
logistic model (see Materials and methods) are depicted in the graph as lines
(solid, monoesters:
ln(Pdetection/1–Pdetection)=1.4519+0.6602xamount;
broken, diesters:
ln(Pdetection/1–Pdetection)=0.1786+0.6602xamount).
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