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Fig. 1 | Movement Ecology

Fig. 1

From: Seasonal and inter-annual  variation  in exposure to peregrines (Falco peregrinus) for southbound western sandpipers (Calidris mauri)

Fig. 1

Seasonal presence of peregrine falcons on the Fraser estuary, based on ~ 1100 near-daily standardized 1 h surveys late June – late October, 1986–2002. The surveys are reported in Lank et al. (2003). A total of 1250 peregrine sightings were recorded (overall average 1.1 per survey). Day-of-year 175 is June 24; day-of-year 275 is October 2. Shown is the number of peregrines sighted daily, averaged over 5-day blocks centred on each point, and expressed as a proportion of the level reached during October of the same year. Note that the curve is not cumulative: it represents the proportional number of daily peregrine sightings. Note also that the peregrine arrival dates observed in this study are shown in Fig. 2

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Movement Ecology

ISSN: 2051-3933