Prof Christopher Ramsey: Publications

Rapid Turnover of Hyphae of Mycorrhizal Fungi Determined by AMS Microanalysis of ¹⁴ C

Science American Association for the Advancement of Science (AAAS) 300:5622 (2003) 1138-1140

Authors:

Philip L Staddon, Christopher Bronk Ramsey, Nick Ostle, Philip Ineson, Alastair H Fitter

Abstract:

Processes in the soil remain among the least well-characterized components of the carbon cycle. Arbuscular mycorrhizal (AM) fungi are ubiquitous root symbionts in many terrestrial ecosystems and account for a large fraction of photosynthate in a wide range of ecosystems; they therefore play a key role in the terrestrial carbon cycle. A large part of the fungal mycelium is outside the root (the extraradical mycelium, ERM) and, because of the dispersed growth pattern and the small diameter of the hyphae (<5 micrometers), exceptionally difficult to study quantitatively. Critically, the longevity of these fine hyphae has never been measured, although it is assumed to be short. To quantify carbon turnover in these hyphae, we exposed mycorrhizal plants to fossil (“carbon-14–dead”) carbon dioxide and collected samples of ERM hyphae (up to 116 micrograms) over the following 29 days. Analyses of their carbon-14 content by accelerator mass spectrometry (AMS) showed that most ERM hyphae of AM fungi live, on average, 5 to 6 days. This high turnover rate reveals a large and rapid mycorrhizal pathway of carbon in the soil carbon cycle.

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Bayesian methods applied to the interpretation of multiple OSL dates: high precision sediment ages from Old Scatness Broch excavations, Shetland Isles

Quaternary Science Reviews Elsevier BV 22:10-13 (2003) 1231-1244

Authors:

EJ Rhodes, C Bronk Ramsey, Z Outram, C Batt, L Willis, S Dockrill, J Bond

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Punctuated dynamic equilibria: a model for chronological analysis

Chapter in Complex Systems and Archaeology, University of Utah Press (2003) 85-92

Erratum: Radiocarbon dating of single compounds isolated from pottery cooking vessel residues (Radiocarbon (2001) 43:2A (191-197))

Radiocarbon 44:1 (2002) 396

Authors:

AW Stott, R Berstan, RP Evershed, REM Hedges, CB Ramsey, MJ Humm

New evidence for an early date for the Aegean Late Bronze Age and Thera eruption

Antiquity Cambridge University Press (CUP) 76:293 (2002) 733-744

Authors:

Sturt W Manning, Christopher Bronk Ramsey, Christos Doumas, Toula Marketou, Gerald Cadogan, Charlotte L Pearson

Abstract:

The authors report on radiocarbon data derived from carefully selected organic material from Late Minoan IA and IB contexts. The results suggest that the accepted chronology of the period should be revised by 100 years and that the eruption of Thera/Santorini most likely occurred c. 1650–1620 BC.

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Prof Christopher Ramsey

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Rapid Turnover of Hyphae of Mycorrhizal Fungi Determined by AMS Microanalysis of ¹⁴ C

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Abstract:

Bayesian methods applied to the interpretation of multiple OSL dates: high precision sediment ages from Old Scatness Broch excavations, Shetland Isles

Authors:

Punctuated dynamic equilibria: a model for chronological analysis

Erratum: Radiocarbon dating of single compounds isolated from pottery cooking vessel residues (Radiocarbon (2001) 43:2A (191-197))

Authors:

New evidence for an early date for the Aegean Late Bronze Age and Thera eruption

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Prof Christopher Ramsey

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Rapid Turnover of Hyphae of Mycorrhizal Fungi Determined by AMS Microanalysis of 14 C

Authors:

Abstract:

Bayesian methods applied to the interpretation of multiple OSL dates: high precision sediment ages from Old Scatness Broch excavations, Shetland Isles

Authors:

Punctuated dynamic equilibria: a model for chronological analysis

Erratum: Radiocarbon dating of single compounds isolated from pottery cooking vessel residues (Radiocarbon (2001) 43:2A (191-197))

Authors:

New evidence for an early date for the Aegean Late Bronze Age and Thera eruption

Authors:

Abstract:

Rapid Turnover of Hyphae of Mycorrhizal Fungi Determined by AMS Microanalysis of ¹⁴ C