Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    Study of improvement for the analysis and exploitation of observers' reports EU fisheries from NW African waters
    Garcia-Isarch, E. ; Clark, J.M. ; Fernandez-Peralta, L. ; Gonzalez-Lorenza, J.G. ; Duque-Nogal, V. ; Corten, A.A.H.M. ; Rey, J. ; Young, C. ; Perales-Raya, C. ; Cervantes, A. ; Verver, S.W. - \ 2020
    European Commission (Specific Contract No. 12 of the Framework Contract EASME/EMFF/2016/008 12) - 109 p.
    Sprookjesbossen op de Limburgse hellingen: hoe zijn ze ontstaan en hoe behouden we ze?
    Hommel, P.W.F.M. ; Ouden, J. den - \ 2017

    Over licht, cyclisch beheer en een opgeladen zaadbank

    Hydrography and Jack mackerel stock in the South Pacific - Final report
    Hintzen, N.T. ; Corten, A.A.H.M. ; Gerlotto, F. ; Habasque, J. ; Bertrand, A. ; Lehodey, P. ; Brunel, T.P.A. ; Dragon, A.C. ; Senina, I. - \ 2014
    IJmuiden : IMARES (Report / IMARES Wageningen UR C176/14) - 65
    trachurus trachurus - zuidelijke stille oceaan - hydrografie - visserijbeheer - visserijbeleid - visstand - duurzaamheid (sustainability) - makrelen - trachurus trachurus - south pacific - hydrography - fishery management - fishery policy - fish stocks - sustainability - mackerels
    This study aims (i) to identify the most likely population structure hypotheses of Jack mackerel, (ii) to identify management objectives for Jack mackerel, and (iii) to evaluate sustainable management strategies to achieve these objectives. These three elements were considered through literature review, statistical and population dynamics modelling. Two different conclusions were drawn: a conclusion towards most likely population structure and a conclusion towards most likely stock structure.
    Hydrography and Jack Mackerel stock in the South Pacific
    Hintzen, N.T. ; Corten, A.A.H.M. ; Gerlotto, F. ; Brunel, T.P.A. - \ 2013
    IJmuiden : IMARES (Report / IMARES Wageningen UR C156/13) - 82
    trachurus - visstand - visbestand - hydrografie - databanken - zuidelijke stille oceaan - trachurus - fish stocks - fishery resources - hydrography - databases - south pacific
    The study on Hydrography and Jack Mackerel stock (Trachurus murphyi) in the South Pacific is currently one year underway. The main achievement consisted of collecting detailed datasets on Chilean, Peruvian and European fisheries activities and information on the hydrographical / biochemical and environmental conditions present in the South Pacific. The hydrographical and environmental datasets are based on the analyses of available acoustic information collected on-board survey and fishing vessels and satellite imagery data. Jack Mackerel habitat models are being developed based on these datasets. These models will be used to produce maps of the potential habitat of Jack Mackerel, on the basis of which different stock structure hypotheses will be tested. The models developed so far are able to accurately represent the distribution of Jack Mackerel as observed by fishing and surveying activities, although some additional investigations are needed to improve the statistical fits. Good fits with hydrographical conditions have been found. The models are not yet ready to be used for testing stock structure hypotheses, but this should be the case in the near future. During the first year of the project, an extensive literature review on Jack Mackerel has also been conducted, and a synthesis has been written, giving an overview on the species biology, ecology and stock structure. The literature suggests that a meta-population structure can be seen as a potential stock structure hypothesis. The literature review also contributed to identify environmental variables that should be crucial to define the suitable habitat of Jack Mackerel. Previously published results indicate, among others, temperature and dissolved oxygen ranges in which Jack Mackerel is able to survive. Finally, a framework to derive reference points for Jack Mackerel, assuming the single stock structure as used within the SPRFMO assessment, has been developed and made available to the SPRFMO Science Committee for review. Analyses of the assessment results within this framework indicate that the fishing mortality corresponding to maximum sustainable yield might be at around 0.15 per year with a corresponding spawning stock biomass of around 10 million tonnes. Different harvest control rules have been evaluated and show little risk to overexploitation in the medium and long term, although these result heavily rely on strong incoming year classes. The tools to evaluate sustainable management options for the Jack Mackerel population, when a stock structure other than a single one is assumed, are currently under development. The design of scenarios to be tested depend on the results of the habitat modelling exercises. Therefore, preliminary results will only become available early 2014.
    Ruimtelijke ordening en erfgoed buiten Nederland
    Corten, J.P.A.M. ; During, R. - \ 2009
    In: Erfgoed en ruimtelijke planning; Sterft, gij oude vormen en gedachten! / van der Zande, A., During, R., Den Haag : Sdu Uitgevers BV (Planologie, reeks over planning en beleid van de fysieke leefomgeving 12) - ISBN 9789012131995 - p. 331 - 360.
    Climate modulates the effects of Sardinella aurita fisheries off Northwest Africa
    Zeeberg, J.J. ; Corten, A.A.H.M. ; Tjoe-Awie, P.J. ; Coca, J. ; Hamady, H. - \ 2008
    Fisheries Research 89 (2008)1. - ISSN 0165-7836 - p. 65 - 75.
    interannual variability - upwelling systems - sea-surface - atlantic - guinea - larvae - coast - oscillation - temperature - recruitment
    The fluctuating abundance of round sardinella (Sardinella aurita) in Mauritanian waters over the past ca. 20 years can be related to environmental dynamics off Northwest Africa. Trends in the fishery are evaluated using FAO data, acoustic surveys, and catch statistics from the EU fleet (1996¿2006). Remote sensing data demonstrate rising annual sea surface temperatures, up to 3 °C higher than the long-term average in 2002¿2003, following a shift in ocean climate in 1995. Fish abundance and repeated expansion of the sardinella population in the past 10 years are attributed to favorable oceanographic conditions and increased recruitment success. Sardinella thrives with intense upwelling and high primary production during spring, and retention of waters over the shelf during summer and autumn. The stock of S. aurita over the Northwest African shelf oscillates with the cold¿warm states of the habitat. Favorable hydrographic conditions and extended habitat has resulted in unprecedented rise of sardinella abundance in the late 1990s, which was counterbalanced by the impact of fisheries. A backshift to a cold-state ecosystem, with extensive regional upwelling and decreased sardinella habitat, would topple that balance.
    Effort development in the industrial fisheries of Mauritania in the period 1992-2004
    Tjoe-Awie, P.J. ; Goudswaard, P.C. ; Ould Inejih, C.A. ; Ould Meissa, B. ; Corten, A.A.H.M. - \ 2006
    Nouadhibou : Inst. Mauritanien de Recherches Oceanographiques et des Pech (Document Technique 2) - 30 p.
    Assessment demersal fish stocks Mauritania
    Corten, A.A.H.M. ; Goudswaard, P.C. ; Heessen, H.J.L. - \ 2006
    IJmuiden : IMARES (Report / IMARES C066/06) - 52
    visstand - visbestand - demersale visserij - demersale vissen - mauritanië - fish stocks - fishery resources - demersal fisheries - demersal fishes - mauritania
    The RIVO project "Assessment of demersal fish stocks in Mauritania" was commissioned by the Ministry of Foreign Affairs of The Netherlands to produce information on the state of the demersal fish stocks (species that live near the bottom) in Mauritania, in particular octopus and shrimps. These stocks are fished by fleets from the EU, working under the fishery agreement between the EU and Mauritania. Although there are no Dutch vessels targeting demersal fish in Mauritania, the government of The Netherlands is co-responsible for the fisheries agreement with Mauritania, and thereby for a rational and sustainable exploitation of the demersal resources.
    Ondanks politieke gevoeligheden: Demersaal project Mauritanie succesvol afgerond
    Corten, A.A.H.M. - \ 2006
    Visserijnieuws 26 (2006)30. - ISSN 1380-5061 - p. 8 - 8.
    Een functie voor het verleden: slotdocument van het project Bescherming & Bestemming
    Valk, A.J.J. van der; Corten, J.P.A.M. - \ 2006
    Wageningen [etc.] : Wageningen University [etc.] - 36
    ruimtelijke ordening - overheidsbeleid - wetgeving - beschermingsgebieden - steden - dorpen - cultureel erfgoed - monumenten - bestemmingsplannen - gemeenten - Nederland - physical planning - government policy - legislation - conservation areas - towns - villages - cultural heritage - monuments - zoning plans - municipalities - Netherlands
    Onderwerp van dit project is de relatie tussen het rijksbeschermd gezicht en het gemeentelijk bestemmingsplan. Beide zijn met elkaar verbonden door de Monumentenwet 1988, die van de gemeente een ruimtelijk beleid verwacht voor gebieden die door het rijk zijn aangewezen als beschermd gezicht. Op deze wijze worden de voorwaarden gecreëerd voor een vitale en kwalitatief hoogwaardige toekomst van historisch waardevolle gebieden
    Weinig jonge Noordzeeharing : wat is de oorzaak ?
    Dickey-Collas, M. ; Corten, A.A.H.M. - \ 2006
    Visserijnieuws 26 (2006)23 special. - ISSN 1380-5061 - p. 34 - 37.
    Bycatch and release of pelagic megafauna in industrial trawler fisheries off Northwest Africa
    Zeeberg, J.J. ; Corten, A.A.H.M. ; Graaf, E. de - \ 2006
    Fisheries Research 78 (2006)2-3. - ISSN 0165-7836 - p. 186 - 195.
    leatherback turtles - atlantic - ocean - sea
    The accidental capture of large animals such as sharks, manta rays, sea turtles, and dolphins in pelagic trawler fisheries remains controversial because it threatens biological diversity in many biogeographical regions, including the subtropical eastern North Atlantic. Bycatch rates observed during more than 1400 trawl sets off Mauritania, Northwest Africa, are shown to have been considerable during the past 4 years, with high animal abundance in Summer when the Northwest African shelf is occupied by subtropical water. We demonstrate the urgency for bycatch reduction and evaluate the use of species-selective gear, a conservation method immediately available and immediately effective in waters fished through international access agreements. A modification tested in commercial trawls during the observer program guides pelagic megafauna deflected by a filter to an escape tunnel along the bottom of the trawl. This ¿excluder¿ reduces bycatch mortality of the most vulnerable megafauna species by at least 40¿100%
    Assessment of sardinella and other small pelagics in West Africa: Final report 2002-2004
    Corten, A.A.H.M. - \ 2006
    IJmuiden : RIVO (Report / RIVO C005/06) - 51 p.
    Evaluatie demersale visbestanden Mauritanie Jaarverslag 2004
    Corten, A.A.H.M. ; Goudswaard, P.C. ; Heessen, H.J.L. - \ 2005
    IJmuiden : RIVO (Rapport / Nederlands Instituut voor Visserij Onderzoek (RIVO) C045/05) - 17
    demersale vissen - visbestand - schaal- en schelpdierenvisserij - garnalen - mauritanië - demersal fishes - fishery resources - shellfish fisheries - shrimps - mauritania
    De werkzaamheden binnen het project werden in 2004 grotendeels volgens de bestaande planning uitgevoerd. Veel tijd werd gestoken in de analyse van al bestaande gegevens in de data base van het IMROP. Hoewel deze data base een aantal belangrijke tekortkomingen kent, kon op basis van de beschikbare informatie toch een redelijk beeld gevormd worden van de garnalenvisserij. De gegevens werden ook gebruikt tijdens twee workshops op het IMROP waarbij de toestand van de garnalenvisserij in Mauritanië werd geëvalueerd. Het bleek dat de garnalen in de ondiepe zone dicht onder de kust (langostino’s) al overbevist waren, terwijl dat voor de garnalen in de diepere zone (gamba’s) nog niet aantoonbaar was. Merkwaardig genoeg had de toename van de visserij inspanning op garnaal in eerste instantie niet geleid tot afname van de garnalenstand. Dit verschijnsel werd toegeschreven aan het wegvangen van de natuurlijke vijanden van de garnaal (grote vissen), waardoor er meer jonge garnalen volwassen konden worden. De gevolgen van de garnalenvisserij op andere visbestanden werden nog niet bekeken. Verwacht mag worden dat dit effect sterk negatief zal zijn.
    Evaluatie demersale visbestanden Mauritanie : jaarverslag 2003
    Corten, A.A.H.M. - \ 2004
    IJmuiden : RIVO (Rapport / RIVO C038/04) - 9 p.
    Assessment of Sardinella and other Small Pelagics in West Africa
    Corten, A.A.H.M. - \ 2004
    IJmuiden : RIVO (RIVO report C042/04) - 18
    pelagische visserij - visbestand - visstand - duurzaamheid (sustainability) - ultrasoon sporen - akoestisch sporen - mauritanië - pelagic fishery - fishery resources - fish stocks - sustainability - ultrasonic tracking - acoustic tracking - mauritania
    The year 2003 was the sixth year of the cooperation between RIVO and the Mauritanian fisheries research institute IMROP (Institut Mauritanien des Recherches Océanographiques et de Pêche). It was also the second year of the current contract between RIVO and the Dutch Ministry of Agriculture, Nature and Food Quality. The cooperation between the Dutch and Mauritanian institutes is aimed at the transfer of technology and experience in the field of pelagic stock assessment. By increasing Mauritania’s capacity for pelagic stock assessment, prospects are improved for a sustainable management of pelagic resources in the area.
    The Gulf of Guinea large marine ecosystem. Environmental forcing and sustainable development of marine resources, 2002
    Corten, A.A.H.M. - \ 2003
    Aquaculture 219 (2003)1-4. - ISSN 0044-8486 - p. 921 - 922.
    The use of CPR data in fisheries research
    Corten, A.A.H.M. ; Lindley, J.A. - \ 2003
    Progress in Oceanography 58 (2003)2-4. - ISSN 0079-6611 - p. 285 - 300.
    eastern north-atlantic - scomber-scombrus l - long-term trends - calanoid copepods - c-helgolandicus - sea - abundance - plankton - cod - zooplankton
    The Continuous Plankton Recorder (CPR) survey was initiated partly to contribute to our understanding of the variability of fish stocks and as a potential method for predicting fish distributions from the abundance and composition of the plankton. The latter objective has been superseded by technological developments in fish detection, but the former has been the subject of continuing, and in recent years expanding use of the CPR data. Examples are presented of application of the data to studies on North Sea herring, cod, mackerel, blue whiting and redfish as well as more general plankton studies relevant to fisheries research. Variations in the migration patterns of herring as well as recruitment have been related to abundances and species composition of the plankton in the CPR survey. Extensive use has been made of the CPR data in relation to cod, particularly in the development and testing of the `match-mismatch' hypothesis. Advection of sufficient numbers of Calanus from the core oceanic areas of its distribution into the areas where the cod stocks occur may partly determine the success of those stocks. The analysis of the distribution and abundances of mackerel larvae in the CPR survey have shown contrasting variations between the North Sea and Celtic Sea. The expansion of the horse mackerel fishery in the north-eastern North Sea since 1987 has been related to physical events and a `regime shift' in the plankton, described from CPR data. The oceanic spawning areas of the blue whiting and redfish were highlighted by the expansion of the CPR survey into the north-eastern and north-western Atlantic respectively. These results helped to focus the attention of fisheries scientists on stocks that have subsequently become the targets for commercial exploitation. The results of the CPR survey, particularly those on Calanus finmarchicus, the phytoplankton standing stock as measured by the CPR colour index, the overall patterns of trends in plankton abundance and distributions of indicator species have been used by fisheries scientists to interpret variations in fish stocks. Generally the CPR data can be used to determine whether changes in the distributions and growth rates of fish have resulted from changes in planktonic food, changes in strength of ocean currents and distribution of water masses and to identify trends in larval abundances. With the tightening regulation of fisheries to reduce overfishing, global climate change and changing anthropogenic inputs into the sea, the unique source of information on unexploited populations in the long-term time series of the CPR survey will be of increasing value to fisheries scientists in the study of natural variability
    The demersal fisheries of Mauritaniua in 2003: description of the fleets and assessment of resources: First report of a joint IMROP/RIVO project
    Corten, A.A.H.M. ; Inejih, C.A.O. ; Cheikna, S.Y.O. ; Meissa, B.O. ; Vlisteren, M. van; Jouffre, D. - \ 2003
    IJmuiden : RIVO (RIVO report C072/03) - 46
    beoordeling - octopus - garnalen - visserijbeleid - visserijbeheer - visstand - ecologische risicoschatting - overexploitatie - assessment - octopus - shrimps - fishery policy - fishery management - fish stocks - ecological risk assessment - overexploitation
    Demersal fisheries in the Mauritanian Exclusive Economic Zone (EEZ) are described, with a review of the state of the stocks that are exploited by these fisheries. The assessment of the various stocks is based primarily on the results of the “Groupe de Travail” (GT), held in December 2002 at the Mauritanian fisheries research institute IMROP, Nouadhibou. The conclusions of these assessments are that the octopus stock in the Mauritanian EEZ is overexploited and that fishing effort is about 30% above the optimum level. Shrimps appear to be exploited near their maximum level. Fishing mortality on hake should be reduced, and the fishing effort in the roundfish fleet should not be further increased.
    Accentverschuiving pelagisch onderzoek : RIVO-medewerkers vinden hun draai in Mauritanie
    Corten, A.A.H.M. - \ 2003
    Visserijnieuws 23 (2003)22. - ISSN 1380-5061 - p. 32 - 37.
    visserij - onderzoek - mauritanië - fisheries - research - mauritania
    Beschrijving van het leven van RIVO-onderzoekers die permanent in Mauritanië gestationeerd zijn en hun onderzoek
    Assessment of sardinella and othter small pelagics in West Africa: Progress Report 2002
    Corten, A.A.H.M. - \ 2003
    IJmuiden : RIVO (RIVO report C009/03) - 16
    west-afrika - sardines - preventie - projecties - overexploitatie - pelagische visserij - west africa - sardines - prevention - projections - overexploitation - pelagic fishery
    The co-operation between the Dutch fisheries research institute RIVO and the Mauritanian fisheries research institute IMROP (Institut Mauritanien des Recherches Océanographiques et de Pêche) in the field of pelagic stock assessment was continued in 2002. In January, a new contract was signed between RIVO and the Dutch Ministry of Agriculture, Nature Management and Fisheries (LNV) that allowed the existing co-operation to be continued and expanded for the next three years. As a consequence, RIVO project staff was increased to three scientists who worked full-time on the project. The project contributed to two major working group meetings: the FAO working group on small pelagics in West Africa (Banjul, March 2002) and the IMROP Groupe de Travail (Nouadhibou, December 2002). Both meetings concluded that there was no evidence yet for over-exploitation of small pelagics at a regional level, but that as a precautionary measure catch levels should not be further increased. The IMROP Groupe de Travail went even further and recommended a freeze on pelagic fishing effort in the Mauritanian zone. During a survey with the Mauritanian research vessel “Al Awam” in November, large concentrations of pelagic fish were observed in the coastal waters off Nouadhibou and Cap Blanc. Especially the presence of large quantities of sardines indicated the recruitment of a strong year-class and good prospects for the sardine fishing for several years to come.
    Visserijbeheer wordt serieus genomen. Mauritanie sluit alle demersal visserij voor twee maanden
    Corten, A.A.H.M. - \ 2002
    Visserijnieuws 22 (2002)22. - ISSN 1380-5061 - p. 40 - 41.
    The role of 'conservatism' in herring migrations
    Corten, A. - \ 2002
    Reviews in Fish Biology and Fisheries 11 (2002). - ISSN 0960-3166 - p. 339 - 361.
    Herring (Clupea harengus) migrations tend to remain constant over periods of several years or even decades, despite environmental variation. When a migration pattern is changed, apparently in response to an environmental stimulus, the change in migratory behavior sometimes lasts longer than the environmental stimulus itself. This paper reviews evidence that the response of herring to environmental change is restrained by conservatism. Herring apparently develop certain migratory habits during the early stage of adult life and tend to adhere to these habits for life, even when the environment changes. Two elements of conservatism are distinguished: the formation of habits within one generation, and the transfer of habits between generations. A number of case studies on North Sea herring and Norwegian spring spawning herring are reviewed in order to find evidence for habit formation and tradition in the migrations of these populations. By eliminating the possibility that homing to spawning, wintering and feeding grounds is due to innate behavior or environmental constraints, it is shown that the return of these fish to the same areas each year is most likely a form of learned behavior. In many cases, new year-classes adopt the same migration pattern as their predecessors, which is explained by the social transfer of habits from old herring to young ones. A change of migration pattern is usually initiated by a recruiting year-class that lacks the ``guidance'' of older herring at the time it has to start its first migration. This may be the effect of a special environmental condition that affects the distribution of the recruiting age group more than that of the adult stock component, and thereby results in a separation of the two stock components. After the recruiting year-class has adopted the new migration route, it tends to repeat it in subsequent years. The new migration thus becomes habitual. Subsequent generations may copy the migration and continue this behavior even after the original environmental cause has disappeared.
    Mauritanie sluit alle demersale visserij voor twee maanden Visserijbeheer wordt serieus genomen
    Corten, A. - \ 2002
    Visserijnieuws 22 (2002)38. - ISSN 1380-5061 - p. 8 - 8.
    Assessment of Small pelagics in Mauritania Report of Activities in 2001
    Corten, A. - \ 2002
    IJmuiden : RIVO (RIVO report C046/02) - 13 p.
    Haring hecht aan tradities
    Corten, A. - \ 2002
    Natura 99 (2002)3. - ISSN 0028-0631 - p. 72 - 74.
    haringen - migratie - diergedrag - leren - populaties - populatiedynamica - populatie-ecologie - kuitschieten - mariene ecologie - distributie - geografische verdeling - leervermogen - seizoensmigratie - populatiebiologie - herrings - migration - animal behaviour - learning - populations - population dynamics - population ecology - spawning - marine ecology - distribution - geographical distribution - learning ability - seasonal migration - population biology
    Uit onderzoek van de migratiepatronen van Noordzeeharing tussen voedsel-, paai- en overwinteringsgebieden blijkt dat de populaties van verschillende paaiplaatsen geen gescheiden rassen zijn met door instinct bepaald trekgedrag. Bestaande migratiepatronen kunnen beschouwd worden als tradities die door oudere generaties worden doorgegeven aan jongere; aangeleerd gedrag dus. Het gedrag van een populatie kan veranderen wanneer een nieuwe jaarklas, die nog niet gebonden is aan een bepaalde gewoonte, zich laat beïnvloeden door hydrografische verstoringen. Als voorbeelden het herstel van een jarenlang uitgestorven paaiplaats op de Aberdeenbank, en het voorkomen van periodes waarin Noordzeeharing overwintert in het Skagerrak (Bohuslän periodes)
    Ontsnappingsluik voor ongewilde bijvangsten: proef bij trawlervisserij Mauritanie: geen haaien en roggen meer in de pelagische vangst
    Haan, D. de; Corten, A.A.H.M. - \ 2001
    Visserijnieuws 21 (2001)48. - ISSN 1380-5061 - p. 6 - 6.
    Eerste echosurvey 'Al Awam' gematigd succes; Sardinella stijf onder de kust
    Corten, A.A.H.M. - \ 2001
    Visserijnieuws 21 (2001)46. - ISSN 1380-5061 - p. 11 - 11.
    FAO werkgroep voor pelagische vis in West-Afrika: advies vangsten niet laten stijgen
    Corten, A.A.H.M. - \ 2001
    Visserijnieuws 21 (2001)15. - ISSN 1380-5061 - p. 7 - 7.
    Meer gebruik satellietfoto's bij Mauritanie: beelden van chlorofyl, groene kleurstof in plankton
    Corten, A.A.H.M. - \ 2001
    Visserijnieuws 21 (2001)7. - ISSN 1380-5061 - p. 8 - 8.
    Northern distribution of North Sea herring as a response to high water temperature and/or low food abundance
    Corten, A. - \ 2001
    Fisheries Research 50 (2001). - ISSN 0165-7836 - p. 189 - 204.
    Catch distributions and results of acoustic surveys indicate that North Sea herring had an unusually northern distribution during the summers of 1988-1990. Some of the herring may even have temporarily left the North Sea, and migrated to the Faroe plateau. The anomalous distribution of the herring in 1988-1990 appears to be related to a short-term climatic variation. The years were characterized by high water temperatures during the preceding winter, and by a low abundance of Calanus finmarchicus, the principal food of the herring. The low abundance of C. finmarchicus was probably related to the high water temperatures. Both the high temperature and the scarcity of food could explain the northern distribution of the herring. Apart from the 1988-1990 anomaly, a long-term northward shift of catches occurred from 1960 to 1990. This northward trend in catches coincided with a gradual increase in winter temperature, and a sustained decrease of C. finmarchicus. The long-term shift in herring catches, therefore, could signify a gradual change in distribution of the stock, brought about by the same factors that caused the 1988-1990 anomaly. If the recent climatic trend towards higher winter temperatures continues, the anomalous distribution of herring in 1988-1990 could become the normal pattern in future years.
    Mauritaanse onderzoekers leren pelagisch vissen. Echosurveys sardinella en horsmakreel
    Corten, A.A.H.M. - \ 2000
    Visserijnieuws 20 (2000)31. - ISSN 1380-5061 - p. 7 - 7.
    Satellietfoto's mogelijk bruikbaar bij visserij Mauritanië: onderzoek Nederlandse reders en Universiteit van Las Palmas: sardinella en watertemperatuur
    Corten, A.A.H.M. - \ 2000
    Visserijnieuws 20 (2000)10. - ISSN 1380-5061 - p. 6 - 6.
    A possible adaptation of herring feeding migrations to a change in timing of the Calanus finmarchicus season in the eastern North Sea
    Corten, A. - \ 2000
    ICES Journal of Marine Science 57 (2000). - ISSN 1054-3139 - p. 1261 - 1270.
    During the first years after the re-opening of the North Sea herring fishery in 1983, a relatively high proportion of the catches in early summer was taken in the eastern North Sea. After 1986, the proportion of the catch in the eastern North Sea gradually declined. It is assumed that the high catches in the eastern North Sea in the early 1980s were due to a delayed migration of the herring from the eastern to the western part of the North Sea. This delayed departure of the herring from the eastern North Sea could have been caused by favourable food conditions in this area. Data on Calanus finmarchicus from the Continuous Plankton Recorder show that the seasonal cycle of this copepod in the eastern North Sea was delayed during the period 1976–1984, which resulted in an prolonged food supply for the herring in this area. It is likely that this extension of the feeding season induced the herring to delay their departures from the eastern North Sea. When the Calanus season shortened after 1985, the herring advanced their departure from the eastern North Sea. There was a delay of one or two years between the shortening of the feeding season and the earlier departure of the herring from the eastern North Sea. This suggests the existence of a certain conservatism in the migrations of the herring. It seems that the time of departure from the eastern North Sea is based not only on the food situation in the current year, but also on the average timing of food production in earlier years.
    Mauretanië: visproductie en opwelling; Grotere visproductie voor West-Afrikaanse kust
    Corten, A. - \ 1999
    Visserijnieuws 21 (1999). - ISSN 1380-5061 - p. 31 - 33.
    Risico's van overbevissing in West-Afrika: wat doet Nederland?
    Corten, A. - \ 1999
    Visserijnieuws 19 (1999)39. - ISSN 1380-5061 - p. 6 - 6.
    Mauritaanse onderzoekers aan boord van Nederlandse trawlers
    Corten, A. - \ 1999
    Visserijnieuws 19 (1999)15. - ISSN 1380-5061 - p. 7 - 7.
    Noors onderzoekingsschip meet visbestanden bij West-Afrika. Reis aan boord van de "Fridtjof Nansen"
    Corten, A. - \ 1999
    Visserijnieuws 19 (1999)6. - ISSN 1380-5061 - p. 4 - 4.
    Evidence from plankton for multi-annual variations of Atlantic inflow in the northwestern North Sea
    Corten, A. - \ 1999
    Journal of Sea Research 42 (1999)3. - ISSN 1385-1101 - p. 191 - 205.
    Long-term variations in Atlantic plankton species in the North Sea were investigated in order to find support for the hypothesis of a reduced inflow of Atlantic water into the North Sea during the 1960s and 1970s. The material was derived from samples of the Continuous Plankton Recorder Survey during 1948-1996. Fourteen Atlantic plankton species were selected as potential indicators of Atlantic inflow to the North Sea. Principal Component Analysis allowed the classification of these species into a number of sub-groups, each of which showed a different variation over time. One of these groups, consisting of Candacia armata, Metridia lucens, and Tomopteris spp., showed temporal variations that were apparently related to changes in Atlantic inflow. This group was at a low level in the North Sea from 1965 to 1982, and it increased in subsequent years. These variations correspond in time and direction with observed changes in pelagic fish stocks in the area.
    A proposed mechanism for the Boshuslän herring periods
    Corten, A. - \ 1999
    ICES Journal of Marine Science 56 (1999). - ISSN 1054-3139 - p. 207 - 220.
    The reappearance of spawning Atlantic herring (Clupea harengus) on Aberdeen Bank (North Sea) in 1983 and its relationship to environmental conditions
    Corten, A. - \ 1999
    Canadian Journal of Fisheries and Aquatic Sciences 56 (1999). - ISSN 0706-652X - p. 2051 - 2061.
    Visserij-onderzoek in de woestijn: bezoek aan Mauritaans instituut
    Corten, A. - \ 1998
    Visserijnieuws 18 (1998)29. - ISSN 1380-5061 - p. 4 - 4.
    Cross-shelf processes north of Scotland in relation to the southerly migration of Western mackerel
    Reid, D.G. ; Turrell, W.R. ; Walsh, M. ; Corten, A. - \ 1997
    ICES Journal of Marine Science 54 (1997)2. - ISSN 1054-3139 - p. 168 - 178.
    A combined acoustic and hydrographic survey was conducted west of Shetland in January 1995. The temperature salinity structure at the shelf edge north of Scotland was characterised by a narrow (30 kill) core of warm, saline water embedded within a broader distribution of Atlantic Water; this would generally mark the area of the shelf-edge current. Current measurements recorded during the period of this survey demonstration that uncharacteristically, the core did not mark the area of maximum transport along the shelf break but lay inshore of it. Hence larger scale processes associated with the north-west European shelf edge are important in determining the intermediate scale physical environment encountered by mackerel during their southerly migration to the spawning areas. Acoustic survey data revealed that a large number of the mackerel schools were located in, or close to, this warm saline core at the shelf edge, the reminder being found further inshore. Mackerel school structure varied dramatically between the large affected by this core and other parts of the survey area. In general, mackerel form large distinct schools in mid-water, and these were seen during the survey in the shelf waters. In the area of the warm core, schools were found deeper, were more diffuse and tended to form elongated thin layers. We present the hypothesis that the change in schooling behaviour reflects whether or not the schools are actively migrating, and that those schools observed in the warm water core were stationary, and those in cooler water were actively migrating.
    North/south displacement of herring in the northeastern North Sea in response to extreme winter temperatures
    Corten, A. - \ 1997
    In: ICES C.M. 1997/EE:05, Environmental Factors, l997
    Ingezonden brieven: Minister onverwachts overstag in visserijbeleid
    Corten, A. - \ 1997
    Visserijnieuws 17 (1997)27. - ISSN 1380-5061 - p. 4 - 4.
    Geen onmogelijke eisen stellen aan biologisch onderzoek
    Corten, A. - \ 1997
    Visserijnieuws 17 (1997)12. - ISSN 1380-5061 - p. 4 - 4.
    Verdeeldheid belemmert succes Europees visserijbeleid
    Corten, A. - \ 1997
    Staatscourant (1997)49. - ISSN 1566-7235 - p. 6 - 6.
    Bio-economic modelling of North Sea Pelagic Fisheries : Part I en II
    Corten, A. - \ 1997
    Unknown Publisher (RIVO-DLO Rapport C001/97)
    Herd monitoring in traditional cattle husbandry as a tool for productivity research and livestock development
    Klink, E.G.M. Van; Corten, J.J.F.M. ; Kalokoni, D.M. - \ 1996
    Tropical Animal Health and Production 28 (1996)4. - ISSN 0049-4747 - p. 273 - 279.

    In the Western Province of Zambia, a productivity study was carried out in traditionally managed cattle herds. The organisational design of the study and the procedures involved in the management of the data are described. Some possibilities of use of the data are discussed.

    Visserij niet gebaat bij relativeren overbevissing
    Corten, A.C. - \ 1996
    Visserijnieuws 16 (1996)43. - ISSN 1380-5061 - p. 4 - 4.
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