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Factors infuencing bacterial dynamics along a transect from supraglacial runoff to proglacial lakes of a high Arctic glacieri

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Mindl, B and Anesio, AM and Meirer, K and Hodson, A and Laybourn-Parry, J and Sommaruga, R and Sattler, B (2007) Factors infuencing bacterial dynamics along a transect from supraglacial runoff to proglacial lakes of a high Arctic glacieri. FEMS Microbiology Ecology, 59 (2). pp. 307-317. ISSN 0168-6496

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Abstract

Bacterial production in glacial runoff and aquatic habitats along a
c. 500m transect from the ablation area of a Svalbard glacier (Midre Lov´enbreen,
791N, 121E) down to a series of proglacial lakes in its forefield were assessed. In
addition, a series of in situ experiments were conducted to test how different
nutrient sources (glacial flour and dissolved organic matter derived from goose
faeces) and temperature affect bacterial abundance and production in these
ecosystems. Bacterial abundance and production increased significantly along this
transect and reached a maximum in the proglacial lakes. Bacterial diversity profiles
as assessed by denaturing gradient gel electrophoresis indicated that communities
in glacial runoff were different from those in proglacial lakes. Heterotrophic
bacterial production was mainly controlled by temperature and phosphorus
limitation. Addition of both glacial flour and dissolved organic matter derived
from goose faeces stimulated bacterial production in those lakes. The results
suggest that glacial runoff sustains an active bacterial community which is further
stimulated in proglacial lakes by higher temperatures and nutrient inputs from
bird faeces. Thus, as in maritime temperate and Antarctic settings, bacterial
communities developing in the recently deglaciated terrain of Svalbard receive
important inputs of nutrients via faunal transfers from adjacent ecosystems.

Item Type: Article
Keywords: high arctic glacier; supraglacial melt water; proglacial lakes; bacterial production; denaturing gradient gel electrophoresis.
Journal or Publication Title: FEMS Microbiology Ecology
Page Range: pp. 307-317
ISSN: 0168-6496
Identification Number - DOI: 10.1111/j.1574-6941.2006.00262.x
Additional Information:

The definitive version is available at www.blackwell-synergy.com

Date Deposited: 11 Mar 2008 22:36
Last Modified: 18 Nov 2014 03:31
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