{"refrec":{"BRefID":210791,"RR":"<b>Becquevort, S.; Smith, W.O.</b> (2001). Aggregation, sedimentation and biodegradability of phytoplankton-derived material during spring in the Ross Sea, Antarctica. <i>Deep-Sea Res., Part II, Top. Stud. Oceanogr. 48(19-20)</i>: 4155-4178. <a href=\"http://dx.doi.org/10.1016/S0967-0645(01)00084-4\" target=\"_blank\">dx.doi.org/10.1016/S0967-0645(01)00084-4</a>","BEntID":202713,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Deep-Sea Res., Part II, Top. Stud. Oceanogr. 48(19-20)</i>: 4155-4178. <a href=\"https://dx.doi.org/10.1016/S0967-0645(01)00084-4\" target=\"_blank\">https://dx.doi.org/10.1016/S0967-0645(01)00084-4</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Becquevort, S.; Smith, W.O.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Becquevort, S.; Smith, W.O.","Englishabstract":"The sedimentation rates, aggregation and biodegradability of phytoplankton-derived material were investigated in the Ross Sea Polynya during austral spring, 1997. Planktonic organisms and aggregates were collected using a large volume (1001) sampler. The phytoplankton assemblages were dominated by diatoms and/or <i>Phaeocystis antarctica</i>, a colonial haptophyte. Total community sinking rates of phytoplankton or derived aggregates were low, ranging between 0 and 1 m d<sup>-1</sup>, except towards mid-December when the sinking rates increased to 3 m d<sup>-1</sup>. At this time, the co-occurrence of <i>Phaeocystis</i> colonies and diatoms resulted in the enhanced formation of aggregates. Taxon-specific differences in sinking behaviour were observed, in that diatoms and dinoflagellates had higher sinking rates than <i>P. antarctica</i>. The biodegradability of phytoplankton-derived material was estimated from the enzymatic (ectoprotease. ecto-beta -glucosidase) activities of free-living vs. particle-attached bacteria. Bacterial production rates were very low until late November, and from mid-December the bacterial activities increased slowly. At the same time, the proportion of attached bacteria increased; nevertheless, their contribution to the total bacterial activity remained low (less than 19% for ectoprotease, 24% for ecto-beta -glucosidase and 18% for bacterial production). In contrast, specific (per cell) activities were higher for particle-attached bacteria than for free-living bacteria. Calculations suggest that 1.4-38.5% of the primary production potentially could be removed from the euphotic zone via sinking during spring, and 0.5-11.6% could be remineralized by bacterial metabolism, with a minor contribution of particle-attached bacteria (less than 2% of the primary production). Thus, during the most active period of phytoplankton growth when grazing losses are nearly non-existent, most of the removal of phytoplankton-derived particulate material is by passive sinking, and only a small amount of the particulate organic carbon is heterotrophically oxidized.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Aggregation, sedimentation and biodegradability of phytoplankton-derived material during spring in the Ross Sea, Antarctica","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:01.897972","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2001,"MonPub":null,"DateUpdate":"2015-11-06","DateCreate":"2011-12-22","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000172954400013","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/S0967-0645(01)00084-4"},"refs":null,"anarec":{"AnaID":210791,"PubliDate":2001,"Pagination":"4155-4178","XtraPublOfAnaID":null,"ISBN":null,"Volume":"48","Issue":"19-20","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":45197,"SerRR":"Deep-Sea Research, Part II. 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