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Computer analysis of benthic foraminiferal associations in a tidal New Zealand inlet

BRUCE W. HAYWARD and CHRISTOPHER M. TRIGGS
Journal of Micropalaeontology, 13, 103-117, 1 December 1994, https://doi.org/10.1144/jm.13.2.103
BRUCE W. HAYWARD
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CHRISTOPHER M. TRIGGS
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Abstract

Census data on benthic foraminiferal tests in 45 surface sediment samples from Pauatahanui Inlet, Wellington, New Zealand, are analysed by Correspondence Analysis and Non-Hierarchical classification techniques. The faunas are grouped into 7 associations: (A) Trochamminita irregularis/Miliammina fusca - at high tide level in a small tidal creek at the limits of salt water influence; (B) Trochammina inflata/Jadammina macrescens - in an extreme high tidal pool, close to the mouth of a small stream; (C) Miliammina fusca/Haplophragmoides wilberti/Trochammina inflata - intertidal and shallow subtidal (to 0.6 m depth), muddy sand over a large area in the upper reaches of the inlet, where most freshwater runoff enters; (D) Elphidium excavatum/Miliammina fusca - intertidal muddy sand associated with shelly beaches on the fringe of association C; (E) Ammonia beccarii/Haynesina depressula - in a wide variety of intertidal and shallow subtidal (to 3 m depth) sediments that form a belt between the more brackish associations (A–D) and the more normal salinity associations (F–G); (F) Bolivina cf. translucens/Textularia earlandi/Bolivina subexcavata - in mud to muddy, very fine sand in a shallow basin (1–2.5 m deep) in the middle of the inlet and in a small, sheltered backwater; (G) Elphidium charlottensis/Patellinella inconspicua/Quinqueloculina seminula - in sandy mud and muddy fine sand, intertidal to 10 m depth, in the mouth, entrance channel and adjacent outer and middle parts of the inlet, where a flush of normal salinity water enters during each tidal cycle.

Using Canonical Correspondence Analysis, the factors most influential in determining the faunal distribution are, in decreasing importance: freshwater influence (salinity), exposure to the air during tidal cycles, proximity to the open sea, tidal current strength and percentage of mud in the substrate.

    • © 1994 The Micropalaeontological Society

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    Journal of Micropalaeontology: 13 (2)
    Journal of Micropalaeontology
    Volume 13, Issue 2
    December 1994
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    Computer analysis of benthic foraminiferal associations in a tidal New Zealand inlet

    BRUCE W. HAYWARD and CHRISTOPHER M. TRIGGS
    Journal of Micropalaeontology, 13, 103-117, 1 December 1994, https://doi.org/10.1144/jm.13.2.103
    BRUCE W. HAYWARD
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    CHRISTOPHER M. TRIGGS
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    Computer analysis of benthic foraminiferal associations in a tidal New Zealand inlet

    BRUCE W. HAYWARD and CHRISTOPHER M. TRIGGS
    Journal of Micropalaeontology, 13, 103-117, 1 December 1994, https://doi.org/10.1144/jm.13.2.103
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