Skip to main content

IMIS

A new integrated search interface will become available in the next phase of marineinfo.org.
For the time being, please use IMIS to search available data

 

[ report an error in this record ]basket (0): add | show Print this page

Major and comparable roles for free-living and attached bacteria in the degradation of Phaeocystis-derived organic matter in Belgian coastal waters of the North Sea
Becquevort, S.; Rousseau, V.; Lancelot, C. (1998). Major and comparable roles for free-living and attached bacteria in the degradation of Phaeocystis-derived organic matter in Belgian coastal waters of the North Sea. Aquat. Microb. Ecol. 14(1): 39-48. https://dx.doi.org/10.3354/ame014039
In: Aquatic Microbial Ecology. Inter-Research: Oldendorf/Luhe. ISSN 0948-3055; e-ISSN 1616-1564, more
Peer reviewed article  

Available in  Authors 

Keywords
    Phaeocystis Lagerheim, 1893 [WoRMS]
    Marine/Coastal
Author keywords
    Phaeocystis degradation; free-living and particle-attached bacteria;ectoenzymatic activity; growth rate

Authors  Top 

Abstract
    Microbial degradation of Phaeocystisglobosa colonies and their derived organic matter by free-living and attached bacteria was investigated in Belgian coastal waters during the spring development of diatom-Phaeocystis colonies in 1994. Results obtained show concomitant evolution of hydrolytic ectoprotease and b-ectoglucosidase ectoenzymatic activities with respect to the phytoplankton bloom, suggesting that the low biodegradability of Phaeocystis colonies leading to transient accumulations of Phaeocystis-derived material in the coastal North Sea was not due to a lag phase required for the induction of b-ectoglucosidase. Up to 66% of total bacterial biomass was found attached to particles larger than 10 μm. While occurring always in low abundance compared to free-living bacteria, both the average specific biomass and growth rate of particle-attached bacteria were very high, i.e. 60 fg C cell-1 and 0.28 h-1, respectively. Similarly, specific ectoenzymatic activities of particle-attached bacteria were on average about 5 times higher than those characterising free-living bacteria. Budget calculations show a 53% contribution of Phaeocystis-attached bacteria to the mineralisation of Phaeocystis-associated production, i.e. a 53:47% role for attached and free-living bacteria, respectively.

All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy Top | Authors