 |
| Titel |
Seasonal variations of virus- and nanoflagellate-mediated mortality of heterotrophic bacteria in the coastal ecosystem of subtropical western Pacific |
| VerfasserIn |
A. Y. Tsai, G.-C. Gong, J. Hung |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 5 ; Nr. 10, no. 5 (2013-05-06), S.3055-3065 |
| Datensatznummer |
250018237
|
| Publikation (Nr.) |
 copernicus.org/bg-10-3055-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| Since viral lysis and nanoflagellate grazing differ in their impact on the
aquatic food web, it is important to assess the relative importance of both
bacterial mortality factors. In this study, an adapted version of the
modified dilution method was applied to simultaneously estimate the impact of
both virus and nanoflagellate grazing on the mortality of heterotrophic
bacteria. A series of experiments was conducted monthly from April to
December 2011 and April to October 2012. The growth rates of bacteria we
measured ranged from 0.078 h−1 (April 2011) to 0.42 h−1
(September 2011), indicating that temperature can be important in controlling
the seasonal variations of bacterial growth. Furthermore, it appeared that
seasonal changes in nanoflagellate grazing and viral lysis could account for
34% to 68% and 13% to 138% of the daily removal of
bacterial production, respectively. We suggest that nanoflagellate grazing
might play a key role in controlling bacterial biomass and might exceed the
impact of viral lysis during the summer period (July to August) because of
the higher abundance of nanoflagellates at that time. Viral lysis, on the
other hand, was identified as the main cause of bacterial mortality between
September and December. Based on these findings in this study, the seasonal
variations in bacterial abundance we observed can be explained by a scenario
in which both growth rates and loss rates (grazing + viral lysis)
influence the dynamics of the bacteria community. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|