Oribatid mite assemblages across the tree-line in western Norway and their representation in lake sediments |
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| Authors: | Arguitxu de la Riva-Caballero H John B Birks Anne E Bjune Hilary H Birks and Torstein Solh?y |
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| Institution: | (1) Bergen Museum, University of Bergen, Thorm?lensgate 53a, 5007 Bergen, Norway;(2) Department of Biology, University of Bergen, Post box 7803, 5020 Bergen, Norway;(3) Environmental Change Research Centre, Department of Geography, University College London, Gower Street, London, WC1E 6BT, UK;(4) Bjerknes Centre for Climate Research, c/o Department of Biology, All?gaten 41, 5007 Bergen, Norway |
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| Abstract: | Little is known about the relationships between fossil oribatid mite assemblages in lake and mire sediments and the composition,
abundance, and richness of their living communities. Because oribatid mites are a relatively new area of palaeolimnological
study, there is a great lack of knowledge about the taphonomic processes that might affect fossil mite assemblages. The DOORMAT
(Direct Observation Of Recent Macrofossils Across Tree-line) project was designed to study the transport and deposition of
oribatid mites and plant remains in the tree-line area of western Norway. The present study also compares modern oribatid
assemblages with fossil oribatid assemblages in a Holocene lake-sediment sequence from the nearby Trettetj?rn, and considers
the optimal location for studying fossil oribatid mites within a lake basin. Seven novel terrestrial traps (50 × 80 cm Astroturf
doormats) were placed at major vegetational transitions along an altitudinal transect crossing the tree-line ecotone from
633 to 1,120 m a.s.l. at Upsete, west Norway. Three sediment traps were placed in Trettetj?rn (810 m a.sl.) at the inlet,
the middle, and near the outlet. In each terrestrial trap, the oribatid assemblage was found to be characteristic of the surrounding
habitat. The lake-trap analyses showed that aquatic or moist-habitat species had the highest chance of being incorporated
into the lake sediments; the number of terrestrial species decreased considerably from both outlet and inlet traps to the
central trap in the deepest water. The area adjacent to the inlet of Trettetj?rn would therefore be the optimal location for
a sediment core for oribatid analysis. However, this conclusion is not supported when the modern trap results are compared
with the Trettetj?rn sequence from the lake centre. |
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