Abstract

A Holocene sequence of six alternating dune-slack features is found on the outer 2.3 km strip of coastal plain in the Haast Ecological District, south western New Zealand. Climatic conditions are strongly perhumid and mesothermal. Information on surface profile, vegetation pattern and associ- ated environmental parameters is used to establish ecological processes operating in the system. Multivariate analyses of quantitative and floristic data from up to seven structural tiers at fifty-four sites along the sequence have revealed twelve quadrat groups (communities) and twelve generally related floristic groups. These were differentiated from the 110 vascu- lar species and more important bryophytes of the eighty-four taxa recorded. A mixed podocarp-Nothofagus-broadleaved rain forest, up to 33 m tall, dominates the crests and upper slopes of the

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