Import cargo volume at the nation's major retail container ports is expected to slow down this month following record levels seen in September and October as retailers rushed to bring merchandise into the country ahead of a possible shutdown of West Coast ports, according to the monthly Global Port Tracker report released by the National Retail Federation and Hackett Associates.

A shortage of transportation equipment and possible labor disruptions at the Los Angeles/Long Beach port complex, the nation's busiest, is delaying shipping containers for up to three weeks, threatening timely delivery to retailers for the holiday season.

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Retailers concerned by the lack of a West Coast longshoremen's contract will continue to bring merchandise into the country at above-average levels this month, but volume will drop from the record set in August, according to the monthly Global Port Tracker report released by the National Retail Federation and Hackett Associates.