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Why can planktonic crustacean larvae help a species spread to new places?

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A spiny lobster (Palinurus elephas) with long, striped antennae and spiny body stands on sandy ground near a rocky crevice underwater. — arthropod Spiny lobster, or rock lobster (*Palinurus elephas*).

Planktonic crustacean larvae are essential for the dispersal of many species, particularly those that are sessile or have restricted movement as adults, such as barnacles, crabs, and lobsters.12

This dispersal occurs because these animals possess a bipartite life cycle, where the larval phase is spent in the plankton. During this stage, the larvae can move freely, either by their own limited swimming abilities or by being transported over great distances by ocean currents.123

By spending time in the water column, these larvae can reach new environments or isolated habitats that the adult forms would be unable to colonize. This process is a critical biological strategy that allows populations to spread, maintain genetic exchange between distant areas, and colonize new territories. The duration of this larval phase—which can range from minutes to hundreds of days—directly influences how widely a species can be dispersed.1234