The longnose spider crab is a common inhabitant in seagrass beds and sandy areas, although the abundance of individuals is often quite low. Some seasonality occurs with the abundance of L. dubia in more temperate waters. In the northeast United States, both L. dubia and L. emarginata are found in greater numbers in fall and spring, becoming scarce in summer and rare in winter (O'Brien et al. 1999). Although little information has been collected on the spawning seasons of L. dubia, it is likely that food availability and/or water temperature plays a role in abundance of larvae and successful recruitment.
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