Towards a Holarctic synthesis of peatland testate amoeba ecology: Development of a new continental-scale palaeohydrological transfer function for North America and comparison to European data

QUATERNARY SCIENCE REVIEWS

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Article

Amesbury, Matthew J.^1,2  Booth, Robert K.³  Roland, Thomas P.¹  Bunbury, Joan^4,5  Clifford, Michael J.⁶  Charman, Dan J.¹  Elliot, Suzanne⁷  Finkelstein, Sarah⁸  Garneau, Michelle⁹  Hughes, Paul D. M.¹⁰  Lamarre, Alexandre¹¹  Loisel, Julie¹²  Mackay, Helen¹³  Magnan, Gabriel⁹  Markel, Erin R.³  Mitchell, Edward A. D.^14,15  Payne, Richard J.^16,17  Pelletier, Nicolas¹⁸  Roe, Helen⁷  Sullivan, Maura E.³  Swindles, Graeme T.¹⁹  Talbot, Julie²⁰  van Bellen, Simon⁹  Warner, Barry G.²¹ 

[1] Univ Exeter, Geog, Coll Life & Environm Sci, Exeter, Devon, England

[2] Univ Helsinki, Environm Change Res Unit ECRU, Fac Biol & Environm Sci, Helsinki, Finland

[3] Lehigh Univ, Earth & Environm Sci, Bethlehem, PA 18015 USA

[4] Univ Wisconsin, Dept Geog & Earth Sci, La Crosse, WI 54601 USA

[5] Univ Toronto, Dept Geog, Toronto, ON, Canada

[6] Desert Res Inst, Las Vegas, NV USA

[7] Queens Univ Belfast, Sch Nat & Built Environm, Belfast, Antrim, North Ireland

[8] Univ Toronto, Dept Earth Sci, Toronto, ON, Canada

[9] Univ Quebec Montreal, Geotop, Montreal, PQ, Canada

[10] Univ Southampton, Geog & Environm, Southampton, Hants, England

[11] Environm & Climate Change Canada, Gatineau, PQ, Canada

[12] Texas A&M Univ, Dept Geog, College Stn, TX 77843 USA

[13] Newcastle Univ, Sch Geog Polit & Sociol, Newcastle Upon Tyne, Tyne & Wear, England

[14] Univ Neuchatel, Fac Sci, Inst Biol, Neuchatel, Switzerland

[15] Bot Garden Neuchatel, Neuchatel, Switzerland

[16] Univ York, Environm, York, N Yorkshire, England

[17] Penza State Univ, Dept Biol, Penza, Russia

[18] Carleton Univ, Dept Geog & Environm Studies, Ottawa, ON, Canada

[19] Univ Leeds, Sch Geog, Leeds, W Yorkshire, England

[20] Univ Montreal, Dept Geog, Montreal, PQ, Canada

[21] Univ Waterloo, Earth & Environm Sci, Waterloo, ON, Canada

关键词: North America;    Testate amoebae;    Peatland;    Water table;    Transfer function;    Ecology;    Biogeography;    Cosmopolitanism;   

DOI  :  10.1016/j.quascirev.2018.10.034

来源: Elsevier

【 摘 要 】

Fossil testate amoeba assemblages have been used to reconstruct peatland palaeohydrology for more than two decades. While transfer function training sets are typically of local-to regional-scale in extent, combining those data to cover broad ecohydrological gradients, from the regional-to continental- and hemispheric-scales, is useful to assess if ecological optima of species vary geographically and therefore may have also varied over time. Continental-scale transfer functions can also maximise modern analogue quality without losing reconstructive skill, providing the opportunity to contextualise understanding of purely statistical outputs with greater insight into the biogeography of organisms. Here, we compiled, at moderate taxonomic resolution, a dataset of nearly 2000 modern surface peatland testate amoeba samples from 137 peatlands throughout North America. We developed transfer functions using four model types, tested them statistically and applied them to independent palaeoenvironmental data. By subdividing the dataset into eco-regions, we examined biogeographical patterns of hydrological optima and species distribution across North America. We combined our new dataset with data from Europe to create a combined transfer function. The performance of our North-American transfer function was equivalent to published models and reconstructions were comparable to those developed using regional training sets. The new model can therefore be used as an effective tool to reconstruct peatland palaeohydrology throughout the North American continent. Some eco-regions exhibited lower taxonomic diversity and some key indicator taxa had restricted ranges. However, these patterns occurred against a background of general cosmopolitanism, at the moderate taxonomic resolution used. Likely biogeographical patterns at higher taxonomic resolution therefore do not affect transfer function performance. Output from the combined North American and European model suggested that any geographical limit of scale beyond which further compilation of peatland testate amoeba data would not be valid has not yet been reached, therefore advocating the potential for a Holarctic synthesis of peatland testate amoeba data. Extending data synthesis to the tropics and the Southern Hemisphere would be more challenging due to higher regional endemism in those areas. (C) 2018 The Authors. Published by Elsevier Ltd.

【 授权许可】

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