{"refrec":{"BRefID":15404,"RR":"<b>Joiris, C.</b> (1977). Seabirds recorded in the northern North Sea in July: the ecological implications of their distribution, <b><i>in</i></b>: Elskens, I. <i>et al.</i> (Ed.) <i>Studie en beheer van het mariene systeem: 4de Colloquium E4-77, Louvain-la-Neuve, 18 juli-5 augustus 1977, vol. 1.</i> pp. 195-217","BEntID":15404,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":", <b><i>in</i></b>: Elskens, I. <i>et al.</i> <i>Studie en beheer van het mariene systeem: 4de Colloquium E4-77, Louvain-la-Neuve, 18 juli-5 augustus 1977, vol. 1.</i> pp. 195-217","DocTypID":17,"DocType":"Book chapters","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Joiris, C.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Joiris, C.","Englishabstract":"The distribution of seabirds in the northern North Sea in July 1975 clearly shows a 2 zone pattern. In the northwest, zone 1 englobes the great majority of offshore seabirds ( Alcids, Skuas and Gannet), is characterized by high numbers of Fulmars and corresponds with Atlantic water intruding into the North Sea. Zone 2 is characterized by lower numbers of birds, including less fulmars and corresponds with typical North Sea water. Important groups of moulting sub-adult Kittywake are accumulating in subzone 2a, close to the limit of zone 1. This distribution of seabirds probably reflects the abundance of their food, mainly zooplankton and small fish. Because the primary production is of the same order of magnitude in the 2 zones, it is suggested that the main difference lies in the structure of the food web, the northern zone 1 being characterized by a complete food chain: phytoplankton, zooplankton, fish, birds. In zone 2, on the contrary, the phytoplanktonic organic matter is recycled through the by-pass of the heterotrophic bacteria and the higher steps are partially suppressed. The first available results on other parameters (nutrients, bacteria, zooplankton) can fit within this scheme.","AbstractOtherLang":"La distribution des oiseaux de mer dans le nor de la Mer du nord en juillet 1975 relète clairement l'existence de 2 zones. Dans le nord-ouest, la zone 1 englobe la grande majorité d'oiseaux pélagiques (Alcidés, Labbes et Fou) et de grands nombres de Fulmas; elle correspond à la masse d'eau atlantique qui entre en Mer du Nord. La zone 2 est caractérisée par une densité plus faible d'oiseaux, y compris moins de Fulmars, et correspond à une masse d'eau typique de la Mer du Nord. Près de la zone 1, d'importants groupes de mouettes tridactyles subadultes en mue s'accumulent dans la sous-zone 2a.Cette distribution des oiseaux marins peut sans doute s'expliquer par l'abondance de leur nourriture: zooplncton et petits poissons surtout. Comme la production primaire mesurée dans les deux zones est semblable, il est suggéré que la différence essentielle se situe au niveau de la structure de la chaîne alimentaire: cette chaîne serait complète dans la zone 1: phytoplankton, zooplankton, poissons, oiseaux. Dans la zone 2, au contraire, le recyclage des matières organiques phytoplanktoniques serait court-circuité via les bactéries hétérotrophes et les échelons supérieurs moins bien représentés. Les premiers résultats recueillis sur les autres paramètres écologiques (éléments nutritifs, bactéries, zooplankton) semblent bien s'intégrer dans ce schéma.","BibLvlCode":"AM","StandardTitle":"Seabirds recorded in the northern North Sea in July: the ecological implications of their distribution","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1977,"MonPub":null,"DateUpdate":"2019-06-13","DateCreate":"2001-08-10","SecASFANote":null,"ConfID":null,"PeerRev":0,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":15404,"PubliDate":1977,"Pagination":"195-217","XtraPublOfAnaID":null,"ISBN":null,"Volume":null,"Issue":null,"BRefMon":15376,"BRefMonRR":"<b>Elskens, I. <i>et al.</i> (Ed.)</b> (1977). Studie en beheer van het mariene systeem: 4de Colloquium E4-77, Louvain-la-Neuve, 18 juli-5 augustus 1977, vol. 1. 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