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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    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.
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