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Published online by Cambridge University Press: 10 July 2009
p. 329, column 1, line 5, for ‘ Cx.’ read ‘ Cs.’
p. 436, line 22, for ‘ no.’ read ‘ n.’
p. 669, line 9, delete ‘and egg survival remains high (7≥ 79%) for a wide range of saturation ’ and insert'. The response function, shown in Table III, was highly significant (P≤00001)’
p. 706, transfer figure but not caption to p. 712 as Fig. 10
p. 712, transfer figure but not caption to p. 706 as Fig. 5