[Parameters: Topic='OCEANS', Term='OCEAN OPTICS', Variable_Level_1='PHOTOSYNTHETICALLY ACTIVE RADIATION']
The structural and functional diversity of the shallow-water benthic community at New HarbourEntry ID: K082_2001_2002_NZ_6
Abstract: The biodiversity of the seafloor community at New Harbour was investigated to determine the structural and functional diversity of the benthic community and resurveyed over two seasons (01-02 and 02-03). A minimum of three sites, separated by at least 50m and accessed through separate dive holes were surveyed. Two 20m transect lines were laid on the seafloor within the 15-25m depth stratum ... starting from haphazardly chosen starting points. The transects were videoed using a diver-held digital video camera at a fixed height of (a) 70cm above the bottom (for the broader scale analysis of habitat structure) and (b) 40cm above the bottom (to allow for more accurate species identifications). Along one of the 20m transects, core samples were collected from five randomly chosen positions. At each position, two small sediment cores (20mm diam., 50mm deep) were collected, one to determine sediment grain size and benthic chlorophyll a content and one to determine the natural stable isotope signature of the sediment. Also at each position, one large core (70mm diam., 100mm deep) was collected to estimate the abundance and diversity of the benthic macrofauna. Additional collections include: a) three surface sediment scrapes to determine the species composition of microalgae, b) three individuals of each of the numerically dominant epibenthic species, for growth measurements and to determine the stable istope signatures and c) additional specimens of animals and plants and organic material (eg seal faeces) for isotopic analysis to provide a more complete picture of the trophic structure of the community. Algae on the undersurface of the sea-ice were sampled to determine their isotopic signature using five small cores (20mm diam., 100mm deep). Another 9 cores were obtained for the determination of chlorophyll a and species composition of sea-ice algae. Video sampling was stratified by habitat and additional footage was taken of biota in the study area for a general picture of the site. Physical background variables (sea-ice conditions, light colour and intensity) were measured at 15m depth and water currents estimated.
This data set description is a member of a collection. The collection is described in
Start Date: 2001-10-29Stop Date: 2002-11-09
OCEANS > OCEAN OPTICS > FLUORESCENCE
OCEANS > OCEAN OPTICS > PHOTOSYNTHETICALLY ACTIVE RADIATION
BIOLOGICAL CLASSIFICATION > ANIMALS/INVERTEBRATES
BIOLOGICAL CLASSIFICATION > PLANTS
OCEANS > OCEAN CHEMISTRY > PIGMENTS > CHLOROPHYLL
BIOSPHERE > AQUATIC ECOSYSTEMS > BENTHIC HABITAT
BIOSPHERE > AQUATIC ECOSYSTEMS > COASTAL HABITAT
BIOSPHERE > ECOLOGICAL DYNAMICS > COMMUNITY DYNAMICS > COMMUNITY STRUCTURE
Data Set Progress
Phone: +64 7 856 7026
Fax: +64 7 856 0151
Email: v.cummings at niwa.co.nz
NIWA PO Box 11-115
Country: New Zealand
Role: DIF AUTHOR
Phone: +64 3 358 0200
Fax: +64 3 358 0211
Email: s.gordon at antarcticanz.govt.nz
Antarctica New Zealand Private Bag 4745
Country: New Zealand
Cummings, V.J. 2003. Assessing biodiversity on the Antarctic sea floor. Water and atmosphere 11(3): 10-12, 2003.
Thrush, S.F., Hewitt, J.E., Cummings, V.J., Norkko, A. And Chiantore, M. 2010. ß-Diversity and species accumulation in Antarctic coastal benthos: Influence of habitat, distance and productivity on ecological connectivity. PLOS One 5(7): e11899 doi:10.1371/journal.pone.0011899
Cummings, V. Thrush, S. Norkko, A. Andrew, N. Hewitt, J. Funnell, G. Schwarz, A.-M. Accounting for local scale variability in benthos: implications for future assessments of latitudinal trends in the coastal Ross Sea. Antarctic science 18(4): 633-644, 2006.
Norkko, J. Indicators of short-term growth in bivalves: detecting environmental change across ecological scales. Ph.D., University of Auckland : . 2005.
Norkko, A. Thrush, S.F. Cummings, V.J. Gibbs, M.M. Andrew, N.L. Norkko, J. Schwarz, A-M. Trophic structure of coastal Antarctic food webs associated with changes in sea ice and food supply. Ecology 88: 2810-2820, 2007.
Schwarz, A.-M. 2003. Life in the dark: plant growth beneath the sea ice. Water and atmosphere 11(3): 14-15, 2003.
Norkko, J. Norkko, A. Thrush, S.F. Cummings, V.J. Detecting growth under environmental extremes: Spatial and temporal patterns in nucleic acid ratios in two Antarctic bivalves. Journal of experimental marine biology and ecology 326: 144-156, 2005.
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Creation and Review Dates
DIF Creation Date: 2005-10-11
Last DIF Revision Date: 2010-12-08