{"refrec":{"BRefID":3190,"RR":"<b>Tackx, M.L.M.; Bakker, C.; Francke, J.W.; Vink, M.</b> (1989). Size and phytoplankton selection by Oosterschelde zooplankton. <i>Neth. J. Sea Res. 23(1)</i>: 35-43","BEntID":3190,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". <i>Neth. J. Sea Res. 23(1)</i>: 35-43","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Tackx, M.L.M.; Bakker, C.; Francke, J.W.; Vink, M.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Tackx, M.L.M. <i>et al.</i>","Englishabstract":"Grazing of adults of the copepods <i>Acartia</i> spp., <i>Temora longicornis, Centropages hamatus</i> and nauplii of <i>Balanus</i> spp. on natural particulate matter from the Oosterschelde was studied using a Coulter counter. Two types of particulate matter distributions were found to occur in the Oosterschelde: 1. distributions with distinct peaks in the >20 µm size range (A) and 2. more flattened distributions which were bell-shapened or contained multiple small peaks spread over the entire 4-100 µm size range (B). In A-type distributions, peak tracking was performed in all species studied, especially in <i>Acartia</i> spp. and <i>T. longicornis</i>. In B-type distributions, the animals tended to spread their grazing activity towards the smaller particles. Quantitative microscopial analysis of the phytoplankton distributions shows that A- and B-type distributions were caused by the presence (A) or absence (B) of blooms of phytoplankton species with an SED of >20 µm, reaching concentrations of >1,40·10<sup>6</sup> µm³·cm<sup>-3</sup>. The demonstrated clearance rate distributions are shown to result in a concentration of phytoplankton in the ingested material as compared to the medium for all copepod species studied. <i>Balanus</i> spp. nauplii did not demonstrate this systematic selection of phytoplankton. When B-distributions occurred, only <i>Acartia</i> spp. switched its feeding activity towards smaller particles to such a degree that a substantial contribution of the <20 µm size range to the ingested material resulted. Whether this behaviour represents a higher selection capacity for small phytoplankton species or a detritivorous behaviour remains an open question.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Size and phytoplankton selection by Oosterschelde zooplankton","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2025-07-02 08:33:14.980000","timezone_type":1,"timezone":"+00:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1989,"MonPub":null,"DateUpdate":"2003-01-07","DateCreate":"2000-09-01","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:A1989T718100006","VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":3190,"PubliDate":1989,"Pagination":"35-43","XtraPublOfAnaID":null,"ISBN":null,"Volume":"23","Issue":"1","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":44573,"SerRR":"Netherlands Journal of Sea Research. 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