{"refrec":{"BRefID":222648,"RR":"<b>Ekau, W.; Verheye, H.M.; Hagen, W.; Auel, H.; Buchholz, F.; Kreiner, A.; da Silva, A.; Tsotsobe, S.V.</b> (2006). Impact of low oxygen on the life cycles of zooplankton in the Benguela Current Upwelling region = Impacto del bajo oxigeno sobre los ciclos de vida del zooplankton en la region de surgencias de la Corriente de Benguela. <i>Gayana (Concepc.) 70(Supplement 1)</i>: 106","BEntID":214373,"PublicFlag":1,"CheckedFlag":0,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>Gayana (Concepc.) 70(Supplement 1)</i>: 106","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Ekau, W.; Verheye, H.M.; Hagen, W.; Auel, H.; Buchholz, F.; Kreiner, A.; da Silva, A.; Tsotsobe, S.V.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Ekau, W. <i>et al.</i>","Englishabstract":"The  Benguela Current off southern Africa is one of the four major eastern boundary  current systems of the world's oceans, characterized by coastal upwelling and  high productivity supporting commercially valuable fisheries. Uniquely, it is  bounded by warm-water frontal systems along its northern (the Angola-Benguela  Front - ABF) and southern (the Agulhas Current Retroflection) borders, which both  affect the living resources of the Benguela. Another feature of the Benguela is  the extended area of oxygen-depleted water masses. In the north, there is an almost  permanent hypoxic layer overlying the bottom. In some areas, oxygen concentrations  <1 ml l<sup>-1</sup> are also found in the pelagial at depths of 50 to 100  m and thus may be a limiting factor for many pelagic species, particularly their  early life-history stages. This may be even more important than currents, temperature  gradients or food limitation caused by weak upwelling. Until recently, information  on the effects of oxygen depletion on pelagic species, their recruitment or migration  and distribution patterns, was scarce. Research initiatives to redress this were  started under the umbrella of the BENEFIT (Benguela Environment Fisheries Interaction  and Training) Programme and the Germany-South Africa Bi-lateral Scientific and  Technological Cooperation. Data were collected during capacity building and<i>  </i>training cruises onboard the South African FRS <i>Africana</i> (1999 and 2002)  and the German RV <i>Alexander v. Humboldt</i> (2004). We present data on horizontal  and vertical distribution patterns of low-oxygen water and how hypoxic conditions  affect the distribution of life-history stages of populations of zooplankton (e.g.,  the dominant copepod <i>Calanoides</i> <i>carinatus</i>) and commercial fish (e.g.,  larvae of sardine <i>Sardinops</i> <i>sagax</i>, anchovy <i>Engraulis</i> <i>encrasicolus</i>  and horse mackerel <i>Trachurus</i> <i>capensis</i>). The observed large-scale  patterns in the hydrography and plankton distributions suggest that the Benguela  system comprises a number of sub-systems, distinguishable based on water-mass  characteristics, productivity patterns and plankton communities. Consideration  of oxygen as an important environmental factor in the life history of zoo- and  ichthyoplankton species and communities opens new perspectives for explaining  their life-history strategies. Tight correlations exist between oxygen concentration  and stratification as well as ecological adaptations of copepods and larval fish.  For instance, <i>C. carinatus</i> did not inhabit the intermediate oxygen minimum  layer (IOML; <1 ml O<sub>2</sub> l<sup>-1</sup>). Experimental and physiological  studies showed strong differences between active, lipid-poor individuals at the  surface and diapausing, lipid-rich copepodids C5 below the IOML with severely  reduced metabolism and respiration rates. Clearly, the role of the different zooplankton  components interlinking primary production with pelagic fish stock dynamics under  various seasonal and environmental influences, especially oxygen deficiency, is  not fully understood, warranting further investigation.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Impact of low oxygen on the life cycles of zooplankton in the Benguela Current Upwelling region = Impacto del bajo oxigeno sobre los ciclos de vida del zooplankton en la region de surgencias de la Corriente de Benguela","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":2006,"MonPub":null,"DateUpdate":"2014-12-17","DateCreate":"2013-02-06","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":222648,"PubliDate":2006,"Pagination":"106","XtraPublOfAnaID":null,"ISBN":null,"Volume":"70","Issue":"Supplement 1","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":108388,"SerRR":"Gayana (Concepción). 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