Behavior Constrains the Dispersal of Long-Lived Spiny Lobster Larvae

Behavior such as ontogenetic vertical migration (OVM) limits the transport of marine larvae with short pelagic larval durations (PLDs), but its effect on the supposed long-distance dispersal of larvae with long PLDs is unknown. We conducted laboratory tests of ontogenetic change in larval ph ototaxis and examin ed size-specific patterns of larval distribution in the plankton to characterize OVM in the Caribbean spiny lobster Panulirus argus during its long (6 mo) PLD. We then used a coupled biophysical model to explore the consequences of OVM and hydrodynamics on larval P. argus dispersal in the Caribbean Sea. Larvae reared in the laboratory were positively phototatic for the first 2 mo and then avoided light thereafter, similar that seen in the planktonic distribution of same-sized larvae . Simulations of larval dispersal from 13 spawnin g sites in the Caribbean Sea predicted th at twice as many larvae would recruit to nurseries if they displayed OVM compared with passive dispersers . Larvae with OVM typically settled <400 km from where they were spawned, while passive dispersers often settled >1000 km away. OVM also produced an asymmetrical bimodal pattern of dispersal dominated by larvae that settled near their origin (-60 % ), bu t showed a second peak of larvae that dispersed over long distances (-20 % ). Hydrodyn amics created subregional differences in the potential for self-recr ui tment. Our findings suggest that (1) larval behavior constrains the dispersal of even long-lived larvae, parti cularly in tandem with reten tive oceanographic environments, and (2) larval sources of P. argus in the Caribbean Sea cannot be estimated from passive transport and surface circulation .