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<article language="en">
	<journal>
		<journal_title>Biogeosciences</journal_title>
		<journal_url>www.biogeosciences.net</journal_url>
		<issn>1726-4170</issn>
		<eissn>1726-4189</eissn>
		<volume_number>4</volume_number>
		<issue_number>4</issue_number>
		<publication_year>2007</publication_year>
	</journal>
	<doi>10.5194/bg-4-613-2007</doi>
	<article_url>http://www.biogeosciences.net/4/613/2007/</article_url>
	<abstract_html>http://www.biogeosciences.net/4/613/2007/bg-4-613-2007.html</abstract_html>
	<fulltext_pdf>http://www.biogeosciences.net/4/613/2007/bg-4-613-2007.pdf</fulltext_pdf>
	<start_page>613</start_page>
	<end_page>626</end_page>
	<publication_date>2007-08-08</publication_date>
	<article_title content_type="html">Different carbon isotope fractionation patterns during the development of phototrophic freshwater and marine biofilms</article_title>
	<authors>
		<author numeration="1" affiliations="1,4">
			<name>M. Staal</name>
			<email>mstaal@bi.ku.dk</email>
		</author>
		<author numeration="2" affiliations="2">
			<name>R. Thar</name>
		</author>
		<author numeration="3" affiliations="2">
			<name>M. Kühl</name>
		</author>
		<author numeration="4" affiliations="3">
			<name>M. C. M. van Loosdrecht</name>
		</author>
		<author numeration="5" affiliations="3">
			<name>G. Wolf</name>
		</author>
		<author numeration="6" affiliations="1">
			<name>J. F. C. de Brouwer</name>
		</author>
		<author numeration="7" affiliations="1,5">
			<name>J. W. Rijstenbil</name>
		</author>
	</authors>
	<affiliations>
		<affiliation numeration="1" content_type="html">Department of Marine Microbiology, Netherlands Institute of Ecology &amp;ndash; KNAW, P.O. Box 140, 4400 AC Yerseke, The Netherlands</affiliation>
		<affiliation numeration="2" content_type="html">Marine Biological Laboratory, Institute of Biology, University of Copenhagen, Strandpromenaden 5, 3000 Helsingør, Denmark</affiliation>
		<affiliation numeration="3" content_type="html">Department of Environmental Biotechnology, TU Delft, Julianalaan 67, 2628 BC Delft, The Netherlands</affiliation>
		<affiliation numeration="4" content_type="html">present address: Marine Biological Laboratory, Institute of Biology, University of Copenhagen, Strandpromenaden 5, 3000 Helsingør, Denmark</affiliation>
		<affiliation numeration="5" content_type="html">present address: AE3 Consultancy, Fuchsialaan 8, 4401HV Yerseke, The Netherlands</affiliation>
	</affiliations>
	<abstract content_type="html">Natural phototrophic biofilms are influenced by a broad array of abiotic and
biotic factors and vary over temporal and spatial scales. Different
developmental stages can be distinguished and growth rates will vary due to
the thickening of the biofilm, which is expected to lead to a limitation of
light or mass transport. This study shows that variation in CO&lt;sub&gt;2(aq)&lt;/sub&gt;
availability leads to a fractionation shift and thereby affects &amp;delta;&lt;sup&gt;13&lt;/sup&gt;C
signatures during biofilm development. For phototrophic freshwater
biofilms it was found that the &amp;delta;&lt;sup&gt;13&lt;/sup&gt;C value became less negative
with the thickening of the biofilm, while the opposite trend was found in
marine biofilms. Modeling and pH profiling indicated that the trend in the
freshwater system was caused by an increase in CO&lt;sub&gt;2(aq)&lt;/sub&gt; limitation
resulting in an increase of HCO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;&amp;minus;&lt;/sup&gt; as C-source. The opposite trend
in the marine system could be explained by a higher heterotrophic biomass
and activity causing a higher carbon recycling and thereby lower &amp;delta;&lt;sup&gt;13&lt;/sup&gt;C
values. We conclude that &amp;delta;&lt;sup&gt;13&lt;/sup&gt;C was more related to the
net areal photosynthesis rate and carbon recycling, rather than to the
growth rate of the biofilms.</abstract>
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</article>

