Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/17196
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Ecology of testate amoebae (protista) in south-central Alaska peatlands: Building transfer-function models for palaeoenvironmental studies
Authors: Payne, Richard
Kishaba, Keiko
Blackford, Jeffrey J
Mitchell, Edward A D
Contact Email: r.j.payne@stir.ac.uk
Keywords: Protozoa
Sphagnum
RDA
DCA
Mantel tests
community ecology
transfer functions
testate amoeba
peatland hydrology
palaeoclimate
Alaska
Issue Date: Apr-2006
Publisher: SAGE
Citation: Payne R, Kishaba K, Blackford JJ & Mitchell EAD (2006) Ecology of testate amoebae (protista) in south-central Alaska peatlands: Building transfer-function models for palaeoenvironmental studies, Holocene, 16 (3), pp. 403-414.
Abstract: Testate amoebae are valuable indicators of peatland hydrology and have been used in many palaeoclimatic studies in peatlands. Because the species' ecological optima may vary around the globe, the development of transfer function models is an essential prerequisite for regional palaeoclimatic studies using testate amoebae. We investigated testate amoebae ecology in nine peatlands covering a 250-km north-south transect in south-central Alaska. Redundancy analysis and Mantel tests were used to establish the relationship between the measured environmental variables (water-table depth and pH) and testate amoebae communities. Transfer-function models were developed using weighted averaging, weighted average partial least squares and maximum likelihood techniques. Model prediction error was initially 15.8 cm for water-table depth and 0.3 for pH but this was reduced to 9.7 cm and 0.2 by selective data exclusion. The relatively poor model performance compared with previous studies may be explained by the limitations of one-off water-table measurements, the very large environmental gradients covered and by recent climatic change in the study area. The environmental preferences of testate amoebae species agree well with previous studies in other regions. This study supports the use of testate amoebae in palaeoclimate studies and provides the first testate amoebae transfer function from Alaska.
Type: Journal Article
URI: http://hdl.handle.net/1893/17196
DOI Link: http://dx.doi.org/10.1191/0959683606hl936rp
Rights: Publisher policy allows this work to be made available in this repository. Published in The Holocene April 2006 vol. 16 no. 3 403-414 by SAGE. The original publication is available at: http://hol.sagepub.com/content/16/3/403.short
Affiliation: Biological and Environmental Sciences
University of Alaska Anchorage
University of Manchester
ETH Zurich

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