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. 2007 Aug 14;274(1625):2539–2545. doi: 10.1098/rspb.2007.0643

Figure 2.

Figure 2

Variation in breeding dates in relation to the SOI for cohorts that encountered the four strongest El Niño events during their (a) first or (b) second breeding season (1983 (i, ii), 1987 (iii, iv), 1992 (v, vi) and 1998 (vii, viii)). For each panel the leftmost series of observations represent the breeding dates for females in that cohort during the El Niño event (e.g. black arrow in (i)). Each circle in the panel indicates a breeding date for a female in the cohort that year. Low negative and high positive values of the SOI indicate El Niño and La Niña conditions, respectively. Date of first egg refers to Julian date beginning on 1 January.