New Zealand Journal of Marine and Freshwater Research abstracts
Foraminiferal associations in Port Pegasus,Stewart Island, New Zealand
BRUCE W. HAYWARD
CHRIS J. HOLLIS*
HUGH GRENFELL
Auckland Institute and Museum
Private Bag 92018
Auckland, New Zealand
*Present address: Department of Geology, Utsunomiya University, Utsunomiya 321,
Japan
Abstract Census data on benthic foraminiferal tests in 56
seafloor sediment samples (high tide to 45 m depth; slightly brackish to normal
marine) in Port Pegasus, south-east Stewart Island, are analysed by cluster
analysis. The faunal samples are grouped into six associations: A. Trifarina
angulosa/Textularia proxispira/Miliolinella subrotundata--current-swept
passages and adjacent port; B. Notorotalia finlayi/Quinqueloculina
delicatula/Nonionella flemingi--muddy fine sand at 22-30 m; C.
Notorotalia zelandica/Elphidium novozealandicum--sheltered bays at
2.5-26 m; D. Rosalina bradyi--shallow subtidal amongst rocky reefs; E.
Ammonia beccarii/Elphidium advenum depressulum/Haynesina
depressula--0.5-6 m, sheltered bays and channels of Cooks Arm; F.
Miliammina fusca--brackish, intertidal. In the entrance passages and
exposed shelf (5-45 m depth) planktics comprise 15-30% of the total
foraminiferal tests. Directly inside the passages in Port Pegasus, planktics
comprise 30-65% of the fauna. These are dominated by small species that have
been swept inshore by the predominant onshore swells and winds and carried into
the port by strong tidal currents before settling out of suspension. The small,
calcareous tests of benthic Cassidulina carinata and Trifarina
angulosa also have distribution patterns consistent with some current
transport into Port Pegasus.
Keywords Foraminifera; benthic foraminiferal associations;
planktic foraminiferal abundances; ecological distribution; post-mortem
transport of tests; Port Pegasus; Stewart Island; New Zealand; cluster
analysis; association acores
PDF file of entire paper: medium quality (2743K); (scanned from paper original: notes about this process)
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