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| Titel |
Coupling bioturbation activity to metal (Fe and Mn) profiles in situ |
| VerfasserIn |
L. R. Teal, E. R. Parker, M. Solan |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 4 ; Nr. 10, no. 4 (2013-04-10), S.2365-2378 |
| Datensatznummer |
250018190
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| Publikation (Nr.) |
 copernicus.org/bg-10-2365-2013.pdf |
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| Zusammenfassung |
| The relative contributions that species assemblages, abiotic variables, and
their interactions with one another make to ecosystem properties are
recognised but are seldom considered simultaneously, within context, and at
the appropriate spatio-temporal scales. Here, we combine fluorescent
time-lapse sediment profile imaging (f-SPI) and diffusion gradient thin gels
(DGT) to examine, in situ, the link between an important benthic ecosystem process
(bioturbation) and the availability (profiles) of Fe and Mn. Whilst the
combination of these methodologies (fg-SPI) was successful in gathering
high-resolution in situ data of bioturbation activity and Fe/Mn profiles
simultaneously, we show that the mechanistic basis of how the infaunal
community mediate Fe and Mn is difficult to reconcile because of the
spatio-temporal differences between particle and porewater mixing. This
mismatch means that the consideration of these mechanistic processes in
isolation is likely to limit our interpretative capacity of how infaunal
communities mediate various biogeochemical processes in the natural
environment. Moreover, the combination of multiple technologies, process
based simulation modelling and generalised additive statistical modelling
achieved here, emphasises the importance of simultaneously considering
additional factors that influence benthic chemistry, in particular
bioirrigation and tidal flushing of the sediment profile. Our findings
highlight a pressing need to determine how the relative importance of
multiple abiotic and biotic factors act in concert to alter major
biogeochemical pathways across a variety of contexts and habitats. |
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