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| Titel |
Reality checks on microbial food web interactions in dilution experiments: responses to the comments of Dolan and McKeon |
| VerfasserIn |
M. R. Landry, A. Calbet |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 1, no. 1 ; Nr. 1, no. 1 (2005-08-02), S.39-44 |
| Datensatznummer |
250000099
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| Publikation (Nr.) |
 copernicus.org/os-1-39-2005.pdf |
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| Zusammenfassung |
| Dolan and McKeon (2005) have recently criticized microzooplankton grazing
rate estimates by the dilution approach as being systematically biased and
significantly overestimated. Their argument is based on observed mortality
responses of ciliated protozoa to reduced food in several coastal
experiments and a global extrapolation which assumes that all grazing in all
ocean systems scales to the abundance of ciliates. We suggest that these
conclusions are unrealistic on several counts: they do not account for
community differences between open ocean and coastal systems; they ignore
direct experimental evidence supporting dilution rate estimates in the open
oceans, and they discount dilution effects on mortality rate as well as
growth in multi-layered, open-ocean food webs. High microzooplankton grazing
rates in open-ocean systems are consistent with current views on export
fluxes and trophic transfers. More importantly, significantly lower rates
would fail to account for the efficient nutrient recycling requirements of
these resource-limited and rapid-turnover communities. |
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