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Relationship betwee...
Relationship between sediment organic matter, bacteria composition, and the ecosystem metabolism of alpine streams
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- Logue, Jürg Brendan (författare)
- Swiss Federal Institute of Aquatic Science and Technology (EAWAG),Aquatic Ecology
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- Robinson, Christopher T. (författare)
- Swiss Federal Institute of Aquatic Science and Technology (EAWAG),Aquatic Ecology
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- Meier, Christoph (författare)
- Swiss Federal Institute of Aquatic Science and Technology (EAWAG),Environmental Microbiology
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visa fler...
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- van der Meer, Jan Roelof (författare)
- Swiss Federal Institute of Aquatic Science and Technology (EAWAG),Environmental Microbiology
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visa färre...
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(creator_code:org_t)
- 2004
- 2004
- Engelska.
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Ingår i: Limnology and Oceanography. - 0024-3590 .- 1939-5590. ; 49:6, s. 2001-2010
- Relaterad länk:
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https://urn.kb.se/re...
Abstract
Ämnesord
Stäng
- We tested whether sediment bacteria abundance (4´,6-diamidino-2-phenylindole–stained cell counts) were related to sediment organic content (ash-free dry mass [AFDM]) in 11 nonforested streams of three different Alpine catchments during summer 2003. We used terminal restriction fragment–length polymorphism (T-RLFP, a moleculargenetic technique) to test for seasonal and spatial differences in bacterial composition in these same streams. We then related the above parameters, in conjunction with periphyton biomass and hyporheic respiration, to whole stream estimates of gross primary production (GPP) and ecosystem respiration (ER) in a glacial and nonglacial stream, representing environmental extremes, in one of the catchments. The percentage of organic matter of sediments was 4–14% (0.01–0.04 g AFDM ml sediment-1), and counts of bacteria cells per millimeter of sediment averaged 2x10^6–4x10^6. Bacteria counts correlated with sediment AFDM only for streams in the catchment with highest sediment AFDM levels. Bacteria composition (based on the presence and absence of terminal restriction fragments from T-RFLP analysis) changed seasonally in the different streams and differed between glacial- and groundwater-fed streams. In the one catchment, hyporheic respiration averaged 0.0004 and 0.0003 g O2 h-1 kg sediment-1 and was positively correlated with AFDM (r2=0.23). Ecosystem metabolism displayed a strong seasonality, with GPP averaging 4.5 and 8.4 and ER averaging 5.4 and 9.9 g O2 m-2 d-1 for the two sites, respectively, thus indicating a predominance of heterotrophy (P:R<1) in these high-elevation, open-canopied systems. Bacteria play a strong role in the trophic dynamics of alpine streams.
Ämnesord
- NATURVETENSKAP -- Biologi -- Mikrobiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Microbiology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
Nyckelord
- bacteria
- organic matter
- sediment
- metabolism
- stream
- Biologi med inriktning mot limnologi
- Biology with specialization in Limnology
- Biology with specialization in Microbiology
- Biologi med inriktning mot mikrobiologi
Publikations- och innehållstyp
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- art (ämneskategori)
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