First Union Corp. announced Tuesday that it has snagged a star portfolio manager from the Pioneer Funds as chief investment officer for its Keystone line of equity mutual funds.

Warren Isabelle, 45, will start work Feb. 10 at Keystone Investment Management Co., a Boston unit of the Charlotte, N.C., banking company. The Keystone Funds, which First Union acquired in December, make up 40% of the company's $29 billion-asset Evergreen Keystone Funds family.

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