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Influence of environmental and spatial variables on the distribution of surface sediment diatoms in an upland loch, Scotland

Influence of environmental and spatial variables on the distribution of surface sediment diatoms in an upland loch, Scotland
Influence of environmental and spatial variables on the distribution of surface sediment diatoms in an upland loch, Scotland
The spatial distribution of surface sediment diatoms was analyzed using ArcGIS in the Round Loch of Glenhead, an acid upland lake in south-west Scotland. The assemblages were composed almost entirely of benthic species. Tabellaria quadriseptata was fairly evenly distributed across the loch but some species (Navicula madumensis, Brachysira brebissonii, Aulacoseira perglabra and Eunotia vanheurckii var 1) showed rather patchy distributions.

Ordination analysis was performed to assess the influence of environmental and spatial variables on the diatom composition of the samples. Loss of ignition was significantly negatively correlated with redundancy analysis species axis 1 (r = –0.77), indicating the influence of substrate on the diatom assemblages. The positive relationship between theoretical bottom shear stress resulting from wind stress and redundancy analysis (r = 0.31) suggests wind stress also influences the spatial distribution of diatoms within the loch.

Spatial variables [(principal coordinates of neighbour matrices (PCNM 1 and PCNM3) positively correlated with redundancy analysis axis 2], indicated that spatial variables, ignored in former studies, are a further influence on diatom distribution. Unique environmental and spatial variables explained 27.3% and 8.6% of diatom variability respectively. Environmental and spatial interactive variables combined explained 4.8% of variation.

Although the pure contribution of spatial variables was only 8.6%, the study highlighted the importance of differences in the spatial distribution of different benthic diatom species in this upland lake.
diatom, distribution, composition, benthic, substrate, wind, lake, scotland
0365-0588
367-380
Yang, Hong
2ea2c94c-8d28-4555-98f9-59b615b0cee7
Flower, Roger J.
969760d0-c5d2-4f3c-bdd5-905d1546d87c
Battarbee, Richard W.
f77f208a-e370-440a-8bf7-db6e928c0df5
Yang, Hong
2ea2c94c-8d28-4555-98f9-59b615b0cee7
Flower, Roger J.
969760d0-c5d2-4f3c-bdd5-905d1546d87c
Battarbee, Richard W.
f77f208a-e370-440a-8bf7-db6e928c0df5

Yang, Hong, Flower, Roger J. and Battarbee, Richard W. (2009) Influence of environmental and spatial variables on the distribution of surface sediment diatoms in an upland loch, Scotland. Acta Botanica Croatica, 68 (2), 367-380.

Record type: Article

Abstract

The spatial distribution of surface sediment diatoms was analyzed using ArcGIS in the Round Loch of Glenhead, an acid upland lake in south-west Scotland. The assemblages were composed almost entirely of benthic species. Tabellaria quadriseptata was fairly evenly distributed across the loch but some species (Navicula madumensis, Brachysira brebissonii, Aulacoseira perglabra and Eunotia vanheurckii var 1) showed rather patchy distributions.

Ordination analysis was performed to assess the influence of environmental and spatial variables on the diatom composition of the samples. Loss of ignition was significantly negatively correlated with redundancy analysis species axis 1 (r = –0.77), indicating the influence of substrate on the diatom assemblages. The positive relationship between theoretical bottom shear stress resulting from wind stress and redundancy analysis (r = 0.31) suggests wind stress also influences the spatial distribution of diatoms within the loch.

Spatial variables [(principal coordinates of neighbour matrices (PCNM 1 and PCNM3) positively correlated with redundancy analysis axis 2], indicated that spatial variables, ignored in former studies, are a further influence on diatom distribution. Unique environmental and spatial variables explained 27.3% and 8.6% of diatom variability respectively. Environmental and spatial interactive variables combined explained 4.8% of variation.

Although the pure contribution of spatial variables was only 8.6%, the study highlighted the importance of differences in the spatial distribution of different benthic diatom species in this upland lake.

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More information

Published date: September 2009
Keywords: diatom, distribution, composition, benthic, substrate, wind, lake, scotland

Identifiers

Local EPrints ID: 153861
URI: http://eprints.soton.ac.uk/id/eprint/153861
ISSN: 0365-0588
PURE UUID: 6d95af35-e318-4e1b-b0a2-29598d42026a

Catalogue record

Date deposited: 21 May 2010 09:30
Last modified: 08 Jan 2022 17:27

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Contributors

Author: Hong Yang
Author: Roger J. Flower
Author: Richard W. Battarbee

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