Search Results - "Birks, Hjb"

D.G. Frey and E.S. Deevey Review 1: Numerical tools in palaeolimnology - Progress, potentialities, and problems by Birks, Hjb

“…In the last decade, palaeolimnology has shifted emphasis from being a predominantly qualitative, descriptive subject to being a quantitative, analytical…”
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What Is Natural? The Need for a Long-Term Perspective in Biodiversity Conservation by Willis, K.J, Birks, H.J.B

“…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…”
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Biodiversity baselines, thresholds and resilience: testing predictions and assumptions using palaeoecological data by Willis, K.J., Bailey, R.M., Bhagwat, S.A., Birks, H.J.B.

“…Fossil records are replete with examples of long-term biotic responses to past climate change. One particularly useful set of records are those preserved in…”
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Agroforestry: a refuge for tropical biodiversity? by Bhagwat, Shonil A., Willis, Katherine J., Birks, H. John B., Whittaker, Robert J.

“…As rates of deforestation continue to rise in many parts of the tropics, the international conservation community is faced with the challenge of finding…”
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Orchid species richness along Himalayan elevational gradients by Acharya, Kamal P., Vetaas, Ole R., Birks, H. J. B.

“…Aim: This study explores the relationship between orchid species richness along elevational gradients in the central and eastern Himalaya. Specifically, we…”
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A modern pollen-climate calibration set based on lake sediments from the Tibetan Plateau and its application to a Late Quaternary pollen record from the Qilian Mountains by Herzschuh, Ulrike, Birks, H. J. B., Mischke, Steffen, Zhang, Chengjun, Böhner, Jürgen

“…Aim: Fossil pollen spectra from lake sediments on the Tibetan Plateau have been used for qualitative climate reconstruction, but no modern pollen—climate…”
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The secret assumption of transfer functions: problems with spatial autocorrelation in evaluating model performance by Telford, R.J., Birks, H.J.B.

“…The estimation of the predictive power of transfer functions assumes that the test sites are independent of the modelling sites. Cross-validation in the…”
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Biodiversity trends within the Holocene by Birks, HJB, Felde, Vivian A, Seddon, Alistair WR

“…There is a rapidly emerging interest in detecting and understanding biodiversity trends during the ‘Anthropocene’ in response to human stressors and climate…”
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comparison of altitudinal species richness patterns of bryophytes with other plant groups in Nepal, Central Himalaya by Grau, Oriol, Grytnes, John-Arvid, Birks, H.J.B

“…To explore species richness patterns in liverworts and mosses along a central Himalayan altitudinal gradient in Nepal (100-5500 m a.s.l.) and to compare these…”
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Effect of uneven sampling along an environmental gradient on transfer-function performance by Telford, R. J., Birks, H. J. B.

“…We investigate the effect that uneven sampling of the environmental gradient has on transfer-function performance using simulated community data. We find that…”
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Last nine-thousand years of temperature variability in Northern Europe by Seppä, H., Bjune, A. E., Telford, R. J., Birks, H. J. B., Veski, S.

“…The threat of future global warming has generated a major interest in quantifying past climate variability on centennial and millennial time-scales. However,…”
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Dispersal Limitations Matter for Microbial Morphospecies by Telford, Richard J., Vandvik, Vigdis, Birks, H. J. B.

“…In contrast with macroorganisms, whose geographical ranges are typically restricted, many microbial species appear to have cosmopolitan distributions. This…”
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All age–depth models are wrong: but how badly? by Telford, R.J., Heegaard, E., Birks, H.J.B.

“…The uncertainty and error associated with fitted age–depth models were investigated by fitting a range of models to sets of simulated radiocarbon dates based…”
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Biological responses to rapid climate change at the Younger Dryas—Holocene transition at Kråkenes, western Norway by Birks, H.J.B., Birks, Hilary H.

“…A fine-resolution pollen-stratigraphical study, supported by macrofossil analysis, has been made at Kråkenes Lake, western Norway through the Younger…”
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Mind the gap: how open were European primeval forests? by Birks, H. John B.

“…There are two competing hypotheses about the structure and dynamics of primeval forests in lowland Europe: the high-forest and the wood-pasture hypotheses,…”
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Relationships between calibrated ages and depth in stratigraphical sequences: an estimation procedure by mixed-effect regression by Heegaard, Einar, Birks, H. J.B., Telford, Richard J.

“…We present a procedure for estimating age-depth relationships in stratigraphical sequences by means of a generalized mixed-effect regression using an ancillary…”
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The distribution and abundance of chironomids in high-latitude Eurasian lakes with respect to temperature and continentality: development and application of new chironomid-based climate-inference models in northern Russia by Self, A.E., Brooks, S.J., Birks, H.J.B., Nazarova, L., Porinchu, D., Odland, A., Yang, H., Jones, V.J.

“…The large landmass of northern Russia has the potential to influence global climate through amplification of climate change. Reconstructing climate in this…”
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The intercept is a poor estimate of a calibrated radiocarbon age by Telford, R. J., Heegaard, E., Birks, H. J.B.

“…Intercept-based methods of generating a point estimate of a calibrated radiocarbon date are very popular, but exhibit undesirable behaviour. They are highly…”
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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 by Wang, Y, Herzschuh, U, Shumilovskikh, L. S, Mischke, S, Birks, H. J. B, Wischnewski, J, Böhner, J, Schlütz, F, Lehmkuhl, F, Diekmann, B, Wünnemann, B, Zhang, C

“…Pollen records from large lakes have been used for quantitative palaeoclimate reconstruction, but the influences that lake size (as a result of…”
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Chironomid-inferred air temperatures from Lateglacial and Holocene sites in north-west Europe: progress and problems by Brooks, Stephen J, Birks, H.J.B

“…Non-biting midges (Insecta: Diptera: Chironomidae) are now widely recognised as powerful biological proxies for inferring past climatic change. In this paper…”
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