Search results for: Alistair W. R. Seddon

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Long‐term ecological responses of a lowland dipterocarp forest to climate changes and nutrient availability

Ana Prohaska, Alistair W. R. Seddon, Oliver Rach, Andrew Smith, more

Understanding the long‐term impact of projected climate change on tropical rainforests is critical given their central role in the Earth's system. Palaeoecological records can provide a valuable perspective on this problem. Here, we examine the effects of past climatic changes on the dominant forest type of Southeast Asia – lowland dipterocarp forest. We use a range of proxies extracted from a 1400‐yr‐old...

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A guide to the processing and standardization of global palaeoecological data for large‐scale syntheses using fossil pollen

Suzette G. A. Flantua, Ondrej Mottl, Vivian A. Felde, Kuber P. Bhatta, more

Global Ecology and Biogeography > 32 > 8 > 1377 - 1394

Aim Palaeoecological data are crucial for comprehending large‐scale biodiversity patterns and the natural and anthropogenic drivers that influence them over time. Over the last decade, the availability of open‐access research databases of palaeoecological proxies has substantially increased. These databases open the door to research questions needing advanced numerical analyses and modelling based...

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Vegetation‐memory effects and their association with vegetation resilience in global drylands

Erik Kusch, Richard Davy, Alistair W. R. Seddon

Journal of Ecology > 110 > 7 > 1561 - 1574

Vegetation memory describes the effect of antecedent environmental and ecological conditions on the present ecosystem state and has been proposed as an important proxy for vegetation resilience. In particular, strong vegetation memory has been identified in dryland regions, but the factors underlying the spatial patterns of vegetation memory remain unknown. We aim to map the components and drivers...

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Pollen‐chemistry variations along elevation gradients and their implications for a proxy for UV‐B radiation in the plant‐fossil record

Alistair W. R. Seddon, Daniela Festi, Mayke Nieuwkerk, Ragnhild Gya, more

Journal of Ecology > 109 > 8 > 3060 - 3073

Research indicates that phenolic compounds (e.g. para‐coumaric acid) found within pollen grains may be useful as a proxy to reconstruct the UV‐B radiation received at the Earth's surface in the geological past. However, application of this method to the plant‐fossil record currently relies on a series of untested assumptions surrounding the ecological factors driving the response of pollen grains...

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Equilibrium in plant functional trait responses to warming is stronger under higher climate variability during the Holocene

Pierre Gaüzère, Lars Lønsmann Iversen, Alistair W. R. Seddon, Cyrille Violle, more

Global Ecology and Biogeography > 29 > 11 > 2052 - 2066

Aim The functional trait composition of plant communities is thought to be determined largely by climate, but relationships between contemporary trait distributions and climate are often weak. Spatial mismatches between trait and climatic conditions are commonly thought to arise from disequilibrium responses to past environmental changes. We aimed to investigate whether current trait–climate disequilibrium...

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Chemical variations in Quercus pollen as a tool for taxonomic identification: Implications for long‐term ecological and biogeographical research

Florian Muthreich, Boris Zimmermann, H. John B. Birks, Carlos M. Vila‐Viçosa, more

Journal of Biogeography > 47 > 6 > 1298 - 1309

Aim Fossil pollen is an important tool for understanding biogeographical patterns in the past, but the taxonomic resolution of the fossil‐pollen record may be limited to genus or even family level. Chemical analysis of pollen grains has the potential to increase the taxonomic resolution of pollen analysis, but present‐day chemical variability is poorly understood. This study aims to investigate whether...

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Managing bark beetle impacts on ecosystems and society: priority questions to motivate future research

Jesse L. Morris, Stuart Cottrell, Christopher J. Fettig, Winslow D. Hansen, more

Journal of Applied Ecology > 54 > 3 > 750 - 760

Recent bark beetle outbreaks in North America and Europe have impacted forested landscapes and the provisioning of critical ecosystem services. The scale and intensity of many recent outbreaks are widely believed to be unprecedented. The effects of bark beetle outbreaks on ecosystems are often measured in terms of area affected, host tree mortality rates, and alterations to forest structure and...

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Holocene carbon dynamics at the forest–steppe ecotone of southern Siberia

Anson William Mackay, Alistair W. R. Seddon, Melanie J. Leng, Georg Heumann, more

Global Change Biology > 23 > 5 > 1942 - 1960

The forest–steppe ecotone in southern Siberia is highly sensitive to climate change; global warming is expected to push the ecotone northwards, at the same time resulting in degradation of the underlying permafrost. To gain a deeper understanding of long‐term forest–steppe carbon dynamics, we use a highly resolved, multiproxy, palaeolimnological approach, based on sediment records from Lake Baikal...

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Looking forward through the past: identification of 50 priority research questions in palaeoecology

Alistair W. R. Seddon, Anson W. Mackay, Ambroise G. Baker, H. John B. Birks, more

Journal of Ecology > 102 > 1 > 256 - 267

Priority question exercises are becoming an increasingly common tool to frame future agendas in conservation and ecological science. They are an effective way to identify research foci that advance the field and that also have high policy and conservation relevance.To date, there has been no coherent synthesis of key questions and priority research areas for palaeoecology, which combines biological,...

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DIATOMS (BACILLARIOPHYTA) OF ISOLATED ISLANDS: NEW TAXA IN THE GENUS NAVICULA SENSU STRICTO FROM THE GALáPAGOS ISLANDS

Alistair W. R. Seddon, Cynthia A. Froyd, Andrzej Witkowski

Journal of Phycology > 47 > 4 > 861 - 879

The diatoms (Bacillariophyta) from a coastal lagoon from the Diablas wetlands (Isla Isabela, the Galápagos Islands) were studied in material from surface samples and a sediment core spanning the past 2,700 years in order to examine evidence of diatom evolution under geographic isolation. The total number of taxa found was ∼100. Ultrastructural variation in valve morphology between members of Galápagos...

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PALAEOECOLOGY (2)
PALAEOECOLOGY AND LAND‐USE HISTORY (2)
PALYNOLOGY (2)
RESILIENCE (2)
ABRUPT CLIMATE CHANGE (1)
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NAVICULA SENSU STRICTO (1)
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PALAEO50 (1)
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PARA‐COUMARIC ACID (1)
PARTIAL LEAST SQUARES REGRESSION (1)
PERMAFROST (1)
PINUS SPP. POLLEN (1)
PLANT COMMUNITY COMPOSITION (1)
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R PACKAGE (1)
REMOTE SENSING (1)
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SOCIAL–ECOLOGICAL SYSTEMS (1)
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UV‐B RADIATION (1)
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