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Net autotrophy in an oligotrophic lake rich in dissolved organic carbon and with high benthic primary production
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Limnologi.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Limnologi.
2006 (engelsk)Inngår i: Aquatic Microbial Ecology, ISSN 0948-3055, E-ISSN 1616-1564, Vol. 43, nr 1, s. 1-10Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Biomass and production of microbiota—primary producers as well as heterotrophic bacteria—were studied both in the pelagial and in the benthic habitat over 2 yr in the shallow oligotrophic Lake Eckarfjärden, Sweden. Both biomass and production of microbiota were concentrated in the benthic habitat. Despite a high dissolved organic carbon (DOC) concentration of about 25 mg C l–1 in the water, the total bacterial production was lower than the total primary production. Moreover, measurements of DOC concentrations in the in- and outflow, and CO2-saturation measurements, indicate that the system is net autotrophic. Generally, low-productive systems (<100 µg C l–1 d–1) tend to be net heterotrophic. In contrast, we found a low-productive (55 µg C l–1 d–1) but net autotrophic system, the conditions of which were largely influenced by benthic production. Many lakes in the world are shallow and may provide substantial benthic areas suitable for primary production. Hence, it is important to include this habitat when evaluating whether lakes are autotrophic or heterotrophic systems.

sted, utgiver, år, opplag, sider
2006. Vol. 43, nr 1, s. 1-10
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-93055DOI: 10.3354/ame043001OAI: oai:DiVA.org:uu-93055DiVA, id: diva2:166415
Tilgjengelig fra: 2005-05-11 Laget: 2005-05-11 Sist oppdatert: 2018-06-05bibliografisk kontrollert
Inngår i avhandling
1. Benthic-Pelagic Microbial Interactions and Carbon Cycling in Clearwater Lakes
Åpne denne publikasjonen i ny fane eller vindu >>Benthic-Pelagic Microbial Interactions and Carbon Cycling in Clearwater Lakes
2005 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

This thesis focuses on the interactions among microbiota in clearwater lakes. Field sampling and field experiments were performed to evaluate interactions among microbiota and the importance of benthic versus pelagic microbiota in terms of biomass and production. In addition, carbon cycling in an oligotrophic clearwater lake was calculated.

Biomass and production of microbiota was clearly focused to the benthic habitat. During natural nutrient concentrations growth of heterotrophic bacteria (benthic and pelagic) was coupled to production of microphytobenthos in Lake Eckarfjärden, indicating interactions between autotrophic and heterotrophic microbiota in, as well as between, habitats. At increased nutrient concentrations, growth of heterotrophic bacteria was not correlated to microphytobenthos production. This was explained by less release of dissolved organic carbon (DOC) from microphytobenthos when they got access to more nutrients. Further investigations showed different scenarios in oligotrophic clearwater lakes following increased nutrient concentrations. The interactions between microbiota may be altered following increased nutrient concentrations and the microbial mat either positively or negatively affect the pelagic microbiota. The most striking result was that the expected shift towards dominance of pelagic primary production does not necessarily occur.

Major flows of carbon were identified between different habitats in the oligotrophic clearwater Lake Eckarfjärden, and the net result was that the benthic habitat provided carbon to the pelagial. High DOC concentrations in the lake together with low pelagic production are factors that would indicate net heterotrophy. Accordingly, the pelagial of Lake Eckarfjärden was net heterotrophic but when the benthic and littoral habitats were included in the calculations, the lake turned out to be net autotrophic.

In conclusion, the benthic microbiota contributed significantly to the total production in the investigated lakes and had a major role in the lake metabolism. Thus, this thesis emphasises the importance of benthic microbiota in shallow clearwater lakes.

sted, utgiver, år, opplag, sider
Uppsala: Acta Universitatis Upsaliensis, 2005. s. 39
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 52
Emneord
Biology, microphytobenthos, phytoplankton, heterotrophic bacteria, interactions, nutrients, carbon cycling, clearwater lakes, Biologi
HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-5798 (URN)91-554-6251-0 (ISBN)
Disputas
2006-02-03, Ekmanssalen, Kärnhuset, EBC, Norbyvägen 14, Uppsala, 10:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2005-05-11 Laget: 2005-05-11 Sist oppdatert: 2009-03-31bibliografisk kontrollert

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