An early Holocene occurrence of the mangroveAvicennia marinain Poverty Bay, North Island, New Zealand: Its climatic and geological implications

Abstract

Pollen evidence indicates that the mangrove Avicennia marina var. resinifera (Forst. f.) Bakh. (Avicenniaceae) once occurred in Poverty Bay, and its presence is used as evidence for warm climate following the last glaciation. Radiocarbon dates indicate a maximum time of 9840 + 190 years B. P. (NZ 6309B)* for this warm climate event, coinciding with the Holocene climatic optimum. The mangrove is currently found c. 1 ~ further north in the Bay of Plenty.The climatic implications of the pollen data when considered with macrofaunal determinations, sediment lithologies, depositional environments, and radiocarbon dates show that the early postglacial in Poverty Bay was a time of complex depositional and erosional conditions associated with the postglacial rise in sealevel, local tectonic activity, and the concomitant change in coastal geomorphology.A full description of the pollen of extant Avicennia marina var. resinifera is presented.

Mid‐Holocene Development of Mangrove Communities Featuring Rhizophoraceae and Geomorphic Change in the Richmond River Estuary, New South Wales, Australia

“…Although a considerable body of research documents the Holocene dynamics of mangrove habitats and communities in the tropics and warm subtropics (for example Parkinson et al ., 1994; Crowley, 1996; Fujimoto et al , 1996; Miyagi et al , 1999; Ellison, 2000; Iselbe and Sanchez, 2002), few studies have been carried out in cooler subtropical and warm temperate settings, such as those of southeastern Australia. The limited evidence available suggests that mangrove species in some of these areas have experienced substantial changes in their regional spatial distribution during the Holocene (Mildenhall and Brown, 1987; Mildenhall, 1994).…”

Intertwined effects of climate and land use change on environmental dynamics and carbon accumulation in a mangrove‐fringed coastal lagoon in Java, Indonesia

“…One tablet of Lycopodium spores was added to each subsample prior to the pollen extraction process. Pollen and spores were identified using the reference collection of pollen and spores of the Department of Palynology and Climate Dynamics, University of Goettingen, and other available references (e.g., Pollen and Spore Image Database of the University of Goettingen‐available at http://gdvh.uni-goettingen.de/; Li et al, ; Mao et al, ; Mildenhall & Brown, ; Poliakova & Behling, ). Due to the poor pollen preservation, pollen and spores were counted up to a sum of 200 pollen grains for each sample.…”

“…One tablet of Lycopodium spores was added to each subsample prior to the pollen extraction process. Pollen and spores were identified using the reference col- Goettingen-available at http://gdvh.uni-goett ingen.de/; Li et al, 2012;Mao et al, 2012;Mildenhall & Brown, 1987;Poliakova & Behling, 2016). Due to the poor pollen preservation, pollen and spores were counted up to a sum of 200 pollen grains for each sample.…”

Late Quaternary Climate Variability and Change from Aotearoa New Zealand Speleothems: Progress in Age Modelling, Oxygen Isotope Master Record Construction and Proxy-Model Comparisons

“…The δ 18 O of G. bulloides are variable, but show a decrease around 8 ka [114], while the δ 18 O of Globigerinoides ruber (surface dwelling foraminifera) and G. inflata (which lives in the thermocline, deeper in the water column) indicate waters in this region were well-stratified throughout the Holocene [114]. Nearby, radiocarbon dates that constrain mangrove (Avicennia marina [115]) presence south of East Cape in Gisborne (south of modern limit) have also suggested warmer winter temperatures (and reduced frost) existed in the nearshore environment at the onset of the early Holocene.…”