Macrofaunal abundance and composition on the West Antarctic Peninsula continental shelf

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Glover, A. G., Smith, C. R., Mincks, S. L., Sumida, P. Y. G., & Thurber, A. R. (2008). Macrofaunal abundance and composition on the West Antarctic Peninsula continental shelf: Evidence for a sediment 'food bank' and similarities to deep-sea habitats. Deep-Sea Research Part II: Topical Studies in Oceanography, 55(22), 2491-2501. doi:10.1016/j.dsr2.2008.06.008
TitleMacrofaunal abundance and composition on the West Antarctic Peninsula continental shelf
AuthorsA. Glover, C. Smith, S. Mincks, P. Sumida, A. Thurber
AbstractTo assess the impact and fate of the summer phytoplankton bloom on Antarctic benthos, we evaluated temporal and spatial patterns in macrofaunal abundance and taxonomic composition along a transect crossing the West Antarctic Peninsula (WAP) continental shelf. As part of the FOODBANCS project, we sampled three sites at 550-625 m depths during five cruises occurring in November 1999, February-March 2000, June 2000, October 2000 and March 2001. We used a combination of megacore and box-core samplers to take 81 samples, and collected over 30,000 macrofaunal individuals, one of the largest sampling efforts on the Antarctic shelf to date. Comparison of the two sampling methodologies (box core and megacore) indicates similar macrofaunal densities, but with significant differences in taxonomic composition, a reflection of the different spatial scales of sampling. Macrofaunal abundances on the WAP shelf were relatively high compared to other Antarctic shelf settings. At two of the three sampling sites, macrofaunal abundance remained constant throughout the year, which is consistent with the presence of a sediment 'food bank'. Differences were observed in taxonomic composition at the site closest to the coast (Station A), driven by higher abundances of sub-surface-deposit feeders. A significant temporal response was observed in the ampharetid polychaetes at Station A, with an abundance peak in the late fall post-bloom period; this may have resulted from juvenile recruitment during the summer bloom. Familial composition of macrofaunal polychaetes on the WAP shelf is more closely related to deep-sea abyssal fauna than to other shelf regions, and we hypothesize that this is a result of both local ecological conditions (low temperatures) and a reflection of historical processes such as extinctions on the Antarctic shelf during previous glacial maxima followed by recolonization from the deep sea. © 2008 Elsevier Ltd. All rights reserved.
JournalDeep-Sea Research Part II: Topical Studies in Oceanography
Start page2491
End page2501
SubjectsBlooms (metal), Cellular telephone systems, Fire hazards, Fluxes, Forestry, Organic carbon, Reflection, Sedimentology, Bentho-pelagic coupling, Biogeography, Organic carbon flux, Polychaeta, Seasonality, Time-series, Core samples, benthos, community composition, fauna, food web, phytoplankton, polychaete, recolonization, sediment, taxonomy, time series, Antarctic Peninsula Shelf, Southern Ocean, algae, Ampharetidae
NoteCited By (since 1996):4, Invertebrates, Antarctica, CODEN: DSROE