| Registro completo |
| Provedor de dados: |
OMA
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| País: |
Belgium
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| Título: |
The fate of intertidal microphytobenthos carbon: an in situ <sup>13</sup>C-labeling study
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| Autores: |
Middelburg, J.J.
Barranguet, C.
Boschker, H.T.S.
Herman, P.M.J.
Moens, T.
Heip, C.H.R.
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| Data: |
2000
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| Ano: |
2000
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| Palavras-chave: |
ANE
Netherlands
Westerschelde
Molenplaat
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| Resumo: |
At two intertidal sites (one sandy and one silty, in the Scheldt estuary, The Netherlands), the fate of microphytobenthos was studied through an in situ <sup>13</sup>C pulse- chase experiment. Label was added at the beginning of low tide, and uptake of <sup>13</sup>C by algae was linear during the whole period of tidal exposure (about 27 mg m<sup>-2</sup> h<sup>-1</sup> in the top millimeter at both sites). The <sup>13</sup>C fixed by microphytobenthos was rapidly displaced toward deeper sediment layers (down to 6 cm), in particular at the dynamic, sandy site. The residence times of microphytobenthos with respect to external losses (resuspension and respiration) were about 2.4 and 5.6 d at the sandy and silly stations, respectively. The transfer of carbon from microphytobenthos to benthic consumers was estimated from the appearance of <sup>13</sup>C in bacterial biomarkers, handpicked nematodes, and macrofauna. The incorporation of <sup>13</sup>C into bacterial biomass was quantified by carbon isotope analysis of polar lipid derived fatty acids specific for bacteria. The bacterial polar lipid-derived fatty acids (i14:0, i15:0, a15:0, i16:0, and 18:1 omega 7c) showed rapid, significant transfer from benthic algae to bacteria with maximum labeling after 1 d. Nematodes became enriched after 1 h, and <sup>13</sup>C assimilation increased until day 3. Microphytobenthos carbon entered all heterotrophic components in proportion to heterotrophic biomass distribution (bacteria > macrofauna > meiofauna). Our results indicate a central role for microphytobenthos in moderating carbon flow in coastal sediments.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.vliz.be/imisdocs/publications/54615.pdf
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| Relação: |
info:eu-repo/semantics/altIdentifier/wos/000089396500002
info:eu-repo/semantics/dataset/url/www.vliz.be/imis?dasid=1218
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| Formato: |
application/pdf
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| Fonte: |
%3Ci%3ELimnol.+Oceanogr.+45%286%29%3C%2Fi%3E%3A+1224-1234.+%3Ca+href%3D%22http%3A%2F%2Fhdl.handle.net%2F10.4319%2Flo.2000.45.6.1224%22+target%3D%22_blank%22%3Ehttp%3A%2F%2Fhdl.handle.net%2F10.4319%2Flo.2000.45.6.1224%3C%2Fa%3E
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| Direitos: |
info:eu-repo/semantics/openAccess
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