Abstract
Densities of epibenthic fishes and decapod crustaceans (excluding xanthids and pagurids) were quantified with daytime throw trap sampling in shallow water habitats of New Jersey estuaries. We compared eelgrass (
Zostera marina), sea lettuce macroalgae (
Ulva lactuca), unvegetated sand/mud substrates adjacent to these vegetation types, and saltmarsh creeks. The highest total density of fishes occurred in marsh creeks, due primarily to high abundances of
Menidia menidia. The highest total decapod density was also in a marsh creek, but only slightly surpassed the density in
Zostera. Results of
apriori comparisons tests for individual species demonstrated that vegetation (either
Zostera or
Ulva) was superior in quality (based on fish and decapod densities) to adjacent unvegetated substrates. Sites with
Zostera as the dominant vegetation had higher densities of most fish species than sites with
Ulva as the dominant vegetation, but only one decapod,
Hippolyte pleuracanthus, was more abundant at eelgrass sites.
Ulva lactuca, therefore, was an important habitat in areas lacking
Zostera marina; for the decapods the two vegetation types were comparable in habitat quality, but for fishes
Ulva did not provide an equivalent substitute for
Zostera. Marsh creeks supported very high densities, but only for a few species that were also common in other habitats. Comparison of recruitment patterns suggested many species do not begin exploiting these estuarine habitats until relatively late in the summer, perhaps as result of peak spawning in mid-summer.