Review of the Biology, Life History, and Ecology of Spot, Leiostomus xanthurus, and a Comparison between the Gulf of Mexico and the Western North Atlantic Populations

Leiostomus xanthurus (Spot) is a coastal, sciaenid fish of the northern Gulf of Mexico (GOMEX) and the Western North Atlantic (WNA). With its life-history characteristics and ecology, Spot has become a model for estuarine dependance. The distribution of Spot is largely disjunct, and while genetic exchange between populations in the GOMEX and the WNA is possible, it is likely minimal. Some life-history traits differ between the GOMEX and the WNA populations. Spot reach sexual maturity at a younger age in the GOMEX than in the WNA. Earlier age at maturity in the GOMEX might be associated with higher temperatures. Overall, growth rates are higher in the WNA than the GOMEX, but vary greatly within both regions. Length at age and life span of the species are generally greater in the WNA than in the GOMEX. The ecology of Spot is similar in the GOMEX and the WNA. Climate change and concomitant sea-level rise could affect the distribution of Spot and the location of spawning given rising seawater temperature. The well-documented use of estuarine habitats, especially seagrass meadows and salt marshes, by juveniles might also be affected by sea-level rise.