Vertical distribution of barnacle larvae at a fixed nearshore station in southern California: Stage-specific and diel patterns |
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| Authors: | Fabián J Tapia Claudio DiBacco Jeremiah Jarrett Jesús Pineda |
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| Institution: | 1. Biology Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA;2. Fisheries and Oceans Canada, Bedford Institute of Oceanography, Dartmouth, NS, Canada;3. Biology Department, Central Connecticut State University, New Britain, CT 06050, USA |
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| Abstract: | Patterns of vertical distribution in marine invertebrate larvae interact with coastal hydrodynamics to determine cross-shore distributions, dispersal ranges, and scales of connectivity among populations. We present observations on the vertical distribution of barnacle larvae from southern California, collected from 3 depth intervals every 2 h and over a 48-h period at a fixed nearshore station. Larvae were identified to species and stage of development, and their vertical distributions were tested for day/night and between-stage differences within each species, as well as for correlations with environmental variability. Stage-specific patterns of vertical distribution were distinct and consistent across species. Nauplii were most abundant near the surface at all times, and were numerically dominated by Chthamalus spp. (78% of Nn = 1835). Cyprids were substantially less abundant than nauplii in our samples (Nc = 146) and corresponded mostly to the subtidal barnacle Balanus nubilus (84%). Despite the lower counts and different species composition, our data suggest that cyprids remain within the mid-depth and bottom layers, and that changes in their mean depth of distribution (MDD) may track changes in pycnocline depth. Temporal changes in nauplii MDD were not correlated with water-column variability, wind forcing, or tidal height. The apparent vertical segregation of nauplii and cyprids may be related to previously documented differences in the cross-shore distribution of these stages. |
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| Keywords: | Barnacle larvae Chthamalus Balanus vertical distribution stage-specific southern California nauplii cyprids |
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