California Current Science Plan Table 13

Table 13. Percent numerical contribution of euphausiids to auklet diets and auklet breeding productivity at the Farallon Islands, 1971-1990.

Category \Year 1971* 1977 1979 1980 1981 1985 1986 1987 1988 1989 1990
Percent Euphausiids 22 99 66 46 82 92 95 96 97 98 94
Percent T. spinifera major 85 68 6 55 22 27 43 37 37 22
Percent E. pacifica --- 15 32 75 40 70 62 53 60 61 58
Auklet chicks produced/pair 0.8 0.9 1.1 0.6 0.7 0.7 0.7 0.7 1.1 0.6 0.4
Anomaly of mean chick weights, percent +5 +1 0 -3 +2 -3 -3 +10 -4 0 +5

Category \Year	1971*	1977	1979	1980	1981	1985	1986	1987	1988	1989	1990
Percent Euphausiids	22	99	66	46	82	92	95	96	97	98	94
Percent T. spinifera	major	85	68	6	55	22	27	43	37	37	22
Percent E. pacifica	---	15	32	75	40	70	62	53	60	61	58
Auklet chicks produced/pair	0.8	0.9	1.1	0.6	0.7	0.7	0.7	0.7	1.1	0.6	0.4
Anomaly of mean chick weights, percent	+5	+1	0	-3	+2	-3	-3	+10	-4	0	+5

* Data for 1971 from Manual (1974), who presented data on the proportion of euphausiids in the diet and stated that T. spinifera was the "major" euphausiid species. No data on diet for 1972-76 and 1982-84; see Ainley and Boekelheide (1990) for auklet productivity in those years.

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