Repeatability and Heritability of Behavioural Types in a Social Cichlid

Table 2

Descriptive statistics of the offspring tested.

Parameter	n	Mean	SD	Minimum	Maximum
Treatment of the brood	1327	n with parents: 419, with foster parent: 91, isolation: 817
Mother stock	1327	n 1996: 1031, 2006: 199, 2009: 97
Father stock	1327	n 1996: 1166, 2006: 64, 2009: 97
Tank volume litre^a	1327	47.87	28.63	24^d	93
Tank volume litre^b	1327	88.45	48.13	24^d	188
Tank temperature^a	1219	27.17	1.22	24.25	29.50
Tank temperature^b	1219	26.58	0.87	24.25	28.30
Offspring body size SL (mm)^c	1327	24.11	10.27	7.0	77.0
Offspring behavioural type^e	1327	−0.01565	0.87857	−2.20393	1.49879
n Offspring without missing values	1219

Volume and water temperature of the offspring raising tanks: ^abefore and ^bafter transfer.
^cBody size at personality testing.
^dAll clutches were produced by pairs in 54-to 93-litre tanks, but eggs and offspring from the treatment “isolation” were incubated and raised from the day of egg laying onwards inside 24 litre tanks and later transferred to larger tanks (see information given on tank volumes after transfer).
^eOffspring behavioural type computed as the average of the average score per offspring—behavioural type-from the Categorical Principal Component analysis. Note that each offspring was scored at least twice (at least two test series of boldness test, exploration test and aggression test).