A palaeoenvironmental record of natural and human change from the Auckland Isthmus, New Zealand, during the late Holocene

Abstract

A multi‐proxy analysis of a sediment core from Waiatarua, Auckland Isthmus, adds to an environmental history from the local wetland spanning the Late Glacial to modern times. Several distal tephra were recorded in the core: 8.5 ka Rotoma (reworked), 6.1 ka Tuhua (primary and reworked), most likely the 1.8 ka Taupo (the latter is previously unreported for the Auckland Isthmus), and one unidentified, possibly 665 yr BP Kaharoa. Pollen and diatom analyses of the core show that during the period c. 6000‐c. 4800 yr BP, the site was a lake fringed with Cyperaceae/Leptospermum swamp. The lake became progressively shallower after c. 4800 yr BP, probably due to hydroseral infilling. Surrounding the lake was forest dominated by Dacrydium, Prumnopitys, Metrosideros, and Nestegis. Transition to the Polynesian era appears unclear because the site probably endured a hiatus due to destruction of peat by burning in European times.

Keywords:

• palynology
• diatoms
• tephra
• Auckland Isthmus
• Holocene

Notes

Centre for Archaeological Research, University of Auckland, Private Bag 92 019, Auckland, New Zealand.

School of Environmental and Marine Sciences, University of Auckland, Private Bag 92 019, Auckland, New Zealand.

Department of Geography, University of Auckland, Private Bag 92 019, Auckland, New Zealand.

Department of Geology, University of Auckland, Private Bag 92 019, Auckland, New Zealand.