Blar i Bergen Open Research Archive på forfatter "Birks, Harry John Betteley"
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Quantitative reconstruction of precipitation changes on the NE Tibetan Plateau since the Last Glacial Maximum - extending the concept of pollen source area to pollen-based climate reconstructions from large lakes
Wang, Yongbo; Herzschuh, Ulrike; Shumilovskikh, Lyudmila S.; Mischke, Steffen; Birks, Harry John Betteley; Wischnewski, Juliane; Böhner, Jürgen; Schlutz, Frank; Lehmkuhl, Frank; Diekmann, Bernhard; Wünnemann, Bernd; Zhang, Chengjun (Peer reviewed; Journal article, 2014-01-08)Pollen records from large lakes have been used for quantitative palaeoclimate reconstruction, but the influences that lake size (as a result of species-specific variations in pollen dispersal patterns that smaller pollen ... -
Rate-of-change analysis in palaeoecology revisited: a new approach
Mottl, Ondrej; Grytnes, John Arvid; Seddon, Alistair William Robin; Steinbauer, Manuel; Bhatta, Kuber Prasad; Felde, Vivian Astrup; Flantua, Suzette; Birks, Harry John Betteley (Journal article; Peer reviewed, 2021)Dynamics in the rate of compositional change (rate-of-change; RoC), preserved in paleoecological sequences, are thought to reflect changes due to exogenous (climate and human forcing) or endogenous (local dynamics and ... -
Recent environmental change and atmospheric contamination on Svalbard as recorded in lake sediments – an introduction
Birks, Harry John Betteley; Jones, Vivienne J.; Rose, Neil L. (Peer reviewed; Journal article, 2004)This paper outlines an interdisciplinary project on recent environmental change and atmospheric contamination on the high Arctic archipelago of Svalbard (76º30'N – 80º30'N). It describes the rationale and aims of the project ... -
Recent environmental change and atmospheric contamination on Svalbard as recorded in lake sediments – modern limnology, vegetation, and pollen deposition
Birks, Harry John Betteley; Monteith, Don T.; Rose, Neil L.; Jones, Vivienne J.; Peglar, Sylvia M. (Peer reviewed; Journal article, 2004)Twenty-four lakes on Svalbard were sampled for palaeolimnological studies and are described in terms of their geographical location, catchment characteristics, water chemistry, and flora. No sediment could be retrieved ... -
Recent environmental change and atmospheric contamination on Svalbard as recorded in lake sediments – synthesis and general conclusions
Birks, Harry John Betteley; Jones, Vivienne J.; Rose, Neil L. (Peer reviewed; Journal article, 2004)The major patterns of biostratigraphical and geochemical change detected in a multidisciplinary study on recent environmental change and atmospheric contamination on Svalbard are summarised and synthesized. The patterns ... -
Recent environmental change and human impact on Svalbard: the lake-sediment geochemical record
Boyle, John F.; Rose, Neil L.; Appleby, P. G.; Birks, Harry John Betteley (Peer reviewed; Journal article, 2004)As part of a broader investigation into recent environmental change on Svalbard, the inorganic geochemical record of six lake-sediment cores was analysed. The major temporal trends in sediment elemental composition are ... -
Recent increases in species richness and shifts in altitudinal distributions of Norwegian mountain plants
Klanderud, Kari; Birks, Harry John Betteley (Peer reviewed; Journal article, 2003)Opportunities for observing long-term changes in natural biota are rare. Observations on the distribution and frequency of vascular plants were performed on 23 mountains situated along a west–east gradient in Jotunhei men, ... -
Reflections on the Use of Ecological Attributes and Traits in Quaternary Botany
Birks, Harry John Betteley (Journal article; Peer reviewed, 2020)There has been an upsurge of interest and research activity in trait-based approaches in ecology, biogeography, and macroecology. I discuss if this upsurge has impacted Quaternary botany (the study of plant remains preserved ... -
Regional climate model simulations for Europe at 6k and 0.2k years BP: sensitivity to changes in anthropogenic deforestation
Strandberg, Gustav; Kjellström, Erik; Poska, Anneli; Wagner, Sebastian; Gaillard, Marie-José; Trondman, Anna-Kari; Mauri, Achille; Davis, Basil A.S.; Kaplan, Jed O.; Birks, Harry John Betteley; Bjune, Anne Elisabeth; Fyfe, Ralph; Giesecke, Thomas; Kalnina, Laimdota; Kangur, Mihkel; van der Knaap, Willem O.; Kokfelt, Ulla; Kuneš, Petr; Latalowa, Malgorzata; Marquer, Laurent; Mazier, Florence; Nielsen, Anne Birgitte; Smith, Ben; Seppä, Heikki; Sugita, Shinya (Peer reviewed; Journal article, 2014-03-28)This study aims to evaluate the direct effects of anthropogenic deforestation on simulated climate at two contrasting periods in the Holocene, ~6 and ~0.2 k BP in Europe. We apply We apply the Rossby Centre regional climate ... -
Relationships between calibrated ages and depth in stratigraphical sequences: an estimation procedure by mixed-effect regression
Heegaard, Einar; Birks, Harry John Betteley; Telford, Richard J. (Peer reviewed; Journal article, 2005)We present a procedure for estimating age-depth relationships in stratigraphical sequences by means of a generalized mixed-effect regression using an ancillary function for the partitioning of the fixed effect and the ... -
Response to comment on “Dispersal limitations matter for microbial morphospecies”
Telford, Richard J.; Vandvik, Vigdis; Birks, Harry John Betteley (Peer reviewed; Journal article, 2007)Pither argues that the relationship we found between regional species-richness maxima and modal lake-pH is expected because both values are constrained by the regional pH range and therefore cannot be interpreted as a ... -
Terrestrial pollen record of recent land-use changes around nine North African lakes in the CASSARINA Project
Birks, Hilary H.; Birks, Harry John Betteley; Appleby, P. G.; Fathi, Adel A.; Flower, Roger J.; Kraïem, Mohammed M.; Patrick, Simon T.; Ramdani, Mohammed (Peer reviewed; Journal article, 2001)Pollen analyses and related plant macrofossil records are presented from short cores from nine North African lakes in the EU-funded CASSARINA project. Terrestrial pollen reflects human impact on the vegetation and landscape ... -
Testing the effect of the Himalayan mountains as a physical barrier to gene flow in Hippophae tibetana Schlect. (Elaeagnaceae)
La, Qiong; Zhang, W.; Wang, H.; Zeng, L; Birks, Harry John Betteley; Zhong, Yang (Peer reviewed; Journal article, 2017-05-10)Hippophae tibetana is a small, dioecious wind-pollinated shrub endemic to the Tibetan-Qinghai Plateau. It is one of the shrubs that occur at very high elevations (5250 m a.s.l.). The Himalayan mountains provides a significant ... -
Weighted average regression and environmental calibration as a tool for quantifying climate-driven changes in vegetation
Bhatta, Kuber Prasad; Birks, Harry John Betteley; Grytnes, John-Arvid; Vetaas, Ole Reidar (Journal article; Peer reviewed, 2019)Aims: Studies of the climatic responses of plant assemblages via vegetation-based environmental reconstructions by weighted averaging (WA) regression and calibration are a recent development in modern vegetation ecology. ... -
What is natural? The importance of a long-term perspective in biodiversity conservation and management
Willis, Katherine Jane; Birks, Harry John Betteley (Peer reviewed; Journal article, 2006)Ecosystems change in response to factors such as climate variability, invasions, and wildfires. Most records used to assess such change are based on short-term ecological data or satellite imagery spanning only a few ...