Table 1.

A comparison of the diet of porpoises during spring 1993–2001 with spring 2002–2003. (There were insufficient sandeels to undertake a statistical comparison of size of sandeels in the diet in March.)

month	number stomachs examined		average number of prey per stomach		percentage of animals with sandeels in stomach		percentage of prey that were sandeels			comparison of size of sandeels consumed					percentage of animals starved
										percentage of sandeels				p-values from Χ2-test
										>10 cm		<10 cm
	1993–2001	2002–2003	1993–2001	2002–2003	1993–2001	2002–2003	1993–2001	2002–2003	p-values from Χ2-test	1993–2001	2002–2003	1993–2001	2002–2003		1993–2001	2002–2003
Mar	14	4	243.4	40.3	50	25	60.8	6.6	<0.001	42.6	0.0	53.4	100.0		—	5	33
Apr	17	8	361.8	110.4	65	62	93.1	89.4	<0.001	48.8	42.1	49.2	54.9	<0.001
May	20	4	218.9	86.2	70	75	96.4	39.7	<0.001	15.3	85.3	84.1	14.7	<0.001