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Fig. 4 | Frontiers in Zoology

Fig. 4

From: Flexibility of foraging strategies of the great skua Stercorarius skua breeding in the largest colony in the Barents Sea region

Fig. 4

A Conditional Inference Tree characterizing flights of GPS-logger-equipped great skuas breeding on Bjørnøya during the incubation period (including periods before and after egg loss). a Total trip duration. b Maximal ranges of flights. c Total distance covered. d Minimal convex polygon. The following characteristics of recorded great skua flights: sex (Sx; F – female, M - male), status (BEL – before egg loss, AEL – after egg loss), Bird_ID (individuals A-P) were used as initial explanatory variables. Encircled variables have the strongest association to the response variable (maximal ranges of flights). The p values listed at each encircled node represent the test of independence between the listed variable (sex, Bird_ID) and the response variable (maximal ranges of flights). Terminal nodes indicate which variable levels characterizing the great skua flights ranges and n indicates the number of flights corresponding to specific sex or Bird_ID levels. Boxplots show the median (band inside the box), the first (25%) and third (75%) quartile (box), the lowest and the highest values within 1.5 interquartile range (whiskers) and outliers (circles)

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