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.

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Distribution maps of cetacean and seabird populations in the North‐East Atlantic
Waggitt, J.J. ; Evans, P.G.H. ; Andrade, J. ; Banks, A.N. ; Boisseau, O. ; Bolton, M. ; Bradbury, G. ; Brereton, T. ; Camphuysen, C.J. ; Durinck, J. ; Felce, T. ; Fijn, R.C. ; Garcia‐baron, I. ; Garthe, S. ; Geelhoed, S.C.V. ; Gilles, A. ; Goodall, M. ; Haelters, J. ; Hamilton, S. ; Hartny‐mills, L. ; Hodgins, N. ; James, K. ; Jessopp, M. ; Kavanagh, A.S. ; Leopold, M. ; Lohrengel, K. ; Louzao, M. ; Markones, N. ; Martinez‐cediera, J. ; O’cadhla, O. ; Perry, S.I. ; Pierce, G.J. ; Ridoux, V. ; Robinson, K.P. ; Santos, M.B. ; Saavedra, C. ; Skov, H. ; Stienen, E.W.M. ; Sveegaard, S. ; Thompson, P. ; Vanermen, N. ; Wall, D. ; Webb, A. ; Wilson, J. ; Wanless, S. ; Hiddink, J.G. - \ 2019
Journal of Applied Ecology (2019). - ISSN 0021-8901 - 45 p.
Timing and duration of primary molt in Northern Hemisphere skuas and jaegers
Bemmelen, Rob S.A. van; Clarke, Rohan H. ; Pyle, Peter ; Camphuysen, Kees - \ 2018
The Auk : a quarterly journal of ornithology 135 (2018)4. - ISSN 0004-8038 - p. 1043 - 1054.
annual cycles - molt-migration overlap - primary molt - Stercorariidae
We compared the primary molt of the 4 species of skuas and jaegers (Stercorariidae) that breed in the Northern Hemisphere: Long-tailed Jaeger (Stercorarius longicaudus), Parasitic Jaeger (S. parasiticus), Pomarine Jaeger (S.
pomarinus), and Great Skua (S. skua). We analyzed primary molt data of 1,573 individuals of multiple age classes, mostly collected from photographs taken at sea but also from museum specimens and beached individuals. Whereas molt duration generally increased with species’ size, molt duration in Parasitic and Pomarine jaegers was surprisingly similar given their size difference. Larger species started primary molt earlier and showed more overlap with postbreeding migration, such that there was complete overlap in Great Skua but no overlap in Long-tailed Jaeger. Within jaeger species, the first primary molt cycle took longer than later molt cycles. We suggest that, unlike birds in their first primary molt cycle, birds in their second or subsequent primary molt cycles are time-constrained to complete primary molt before the onset of prebreeding long-distance migration. By contrast, molt duration did not differ between age classes of Great Skuas. Adult Great Skuas may have overcome the time constraint by completely overlapping molt and postbreeding migration. Molt-migration overlap is generally rare in birds but may be feasible for Great Skuas given their shorter migration distance and low migration speed.
Unexpected dietary preferences of Eurasian Spoonbills in the Dutch Wadden Sea: spoonbills mainly feed on small fish not shrimp
Jouta, Jeltje ; Goeij, Petra De; Lok, Tamar ; Velilla, Estefania ; Camphuysen, Cornelis J. ; Leopold, Mardik ; Veer, Henk W. Van Der; Olff, Han ; Overdijk, Otto ; Piersma, Theunis - \ 2018
Journal of Ornithology 159 (2018)3. - ISSN 2193-7192 - p. 839 - 849.
Platalea leucorodia leucorodia - Regurgitate analysis - Restoration - Stable isotope analysis in R - Intertidal - Bayesian mixing models
After an historical absence, over the last decades Eurasian Spoonbills Platalea leucorodia leucorodia have returned to breed on the barrier islands of the Wadden Sea. The area offers an abundance of predator-free nesting habitat, low degrees of disturbance, and an extensive intertidal feeding area with increasing stocks of brown shrimp Crangon crangon, the assumed main prey of P. leucorodia leucorodia. Nevertheless, newly established and expanding colonies of spoonbills have surprisingly quickly reached plateau levels. Here we tested the often stated assertion that spoonbills mainly rely on brown shrimp as food, by quantifying the diet of chicks on the basis of regurgitates and by analysis of blood isotopes using stable isotope Bayesian mixing models. Both methods showed that, rather than brown shrimp being the staple food of spoonbill chicks,
small flatfish (especially plaice Pleuronectes platessa) and gobies (Pomatoschistus spp.) were their main prey. Unlike shrimp, small flatfish have been reported to be rather scarce in the Wadden Sea in recent years, which may explain the rapid saturation of colony size due to food-related density-dependent recruitment declines of growing colonies. By way of their diet and colony growth characteristics, spoonbills may thus indicate the availability of small fish in the Wadden Sea. We predict that the recovery to former densities of young flatfish and other juvenile/small fish in the Wadden Sea will be tracked by changing diets (more fish) and an increase in the size of Eurasian Spoonbill colonies across the Wadden Sea.
The first case of conjoined twin harbour porpoises Phocoena phocoena (Mammalia, Cetacea)
Kompanje, Erwin J.O. ; Camphuysen, K.C.J. ; Leopold, M.F. - \ 2017
Deinsea 17 (2017). - ISSN 2468-8983 - p. 1 - 5.
Phocoena phocoena - harbour porpoise - conjoined twins - parapagus dicephalus - dysmorphology - North Sea
The harbour porpoise (Phocoena phocoena) is the smallest and most abundant cetacean in NW European continental shelf waters. Their global abundance numbers at least ~700,000 individuals. Within the North Sea, total abundance has recently been estimated at approximately 345,000 animals. The species reproduces at a rate of one offspring every 1-2 years. In this article we describe a case of conjoined twins in the harbour porpoise: a parapagus dicephalus bycaught in the Southern North Sea in May 2017. Reports of conjoined twins in wild mammals are extremely scarce. This case concerns the second known case of twinning and the first case of conjoined twins in P. phocoena, the fourth known case of parapagus dicephalus in any cetacean species and the tenth known case of
conjoined twinning in a cetacean species.
Individual specialization on fishery discards by lesser black-backed gulls (Larus fuscus)
Tyson, Chris ; Shamoun-Baranes, Judy ; Loon, E.E. Van; Camphuysen, K.C.J. ; Hintzen, N.T. - \ 2015
ICES Journal of Marine Science 72 (2015)6. - ISSN 1054-3139 - p. 1882 - 1891.
fishery discards - GPS tracking - individual specialization - Larus fuscus - lesser black-backed gull

While seabird-fishery associations are well documented, this research primarily comes from ship-based surveys and consequently individual level responses to discard availability are largely unknown. As part of a long-term study on lesser black-backed gulls (Larus fuscus) in the Netherlands, the fine-scale movements of adults were tracked with GPS tags throughout the breeding period. The aim of this study was to determine if lesser black-backed gulls were utilizing fishery discards in the Wadden Sea and to examine possible consequences of this behaviour. Within the Wadden Sea during weekdays, tracked birds predominately associated with zones where fishing vessels are known to operate (deep gullies). Across all individuals combined (n = 40), there was a significantly reduced use of the Wadden Sea during weekends when the fleets were not operating. Eight females, who markedly increased their use of the Wadden Sea during weekdays throughout the breeding period, were largely responsible for this pattern. The loss of discard resources on weekends primarily resulted in these eight individuals switching to terrestrial foraging areas. Nest attendance and total foraging time were consistent between weekdays and weekends, suggesting that resource shifts on weekends did not impact daily time budgets. As such, it appears that lesser black-backed gulls specializing on discard utilization are able to flexibly respond to the temporary loss of discards by switching to alternative resources.

Vogels op Jan Mayen
Camphuysen, K. ; Bemmelen, R.S.A. van - \ 2015
In: Met de Zr.Ms. Zeeland op expeditie naar Jan Mayen / Hacquebord, L., Postma, E., Verheul, E., Groningen : Barkhuis - ISBN 9789491431869 - p. 36 - 39.
Een zeereis naar het hoge noorden; walvissen en zeevogels onderweg
Camphuysen, K. ; Bemmelen, R.S.A. van - \ 2015
In: Met de Zr. Ms. Zeeland op expeditie naar Jan Mayen / Hacquebord, L., Postma, E., Verheul, E., Groningen : Barkhuis - ISBN 9789491431869 - p. 30 - 35.
Ship-based seabird and marine mammal survey pff Mauritania, 4 - 14 september 2015
Camphuysen, C.J. ; Spanje, T.M. van; Verdaat, J.P. - \ 2015
Den Burg [etc.] : NIOZ (Report / NIOZ etc. ) - 102
monitoring - fauna - marine ecology - mauritania - sea birds - marine mammals - adverse effects - oil and gas industry - mariene ecologie - mauritanië - zeevogels - zeezoogdieren - nadelige gevolgen - olie- en gasindustrie
This report presents the first results obtained during the ship-based seabird and marine mammal surveys conducted between 4 and 14 September 2015 and must be seen as a preliminary analysis of the data and a further step in data collection. This cruise was part of the longer-term research project financed via the Programme “Biodiversity Gas and Oil” (BGO).
Going with the flow: tidal influence on the occurrence of the harbour porpoise (Phocoena phocoena) in the Marsdiep area, The Netherlands
IJsseldijk, L. ; Camphuysen, C.J. ; Nauw, J. ; Aarts, G.M. - \ 2015
Journal of Sea Research 103 (2015). - ISSN 1385-1101 - p. 129 - 137.
One of the most important factors explaining the distribution and behaviour of coastal marine mammals are tides. Tidal forces drive a large number of primary and secondary processes, such as changes in water depth, salinity, temperature, current velocity and direction. Unravelling which tidal process is the most influential for a certain species is often challenging, due to a lack of observations of all tide related covariates, strong correlation between them, and the elusive nature of most marine organisms which often hampers their detection. In the Marsdiep area, a tidal inlet between the North Sea and the Dutch Wadden Sea, the presence of harbour porpoises (Phocoena phocoena) was studied as a function of tide related covariates. Observations were carried out in early spring from a ferry crossing the inlet on a half hourly basis. Environmental and sightings data were collected by one observer, while an on-board Acoustic Doppler Current Profiler (ADCP) and temperature sensor continuously recorded current velocity profiles and temperature, respectively. Sea surface temperature and salinity were measured at a nearby jetty. Sightings (n = 134) were linked to tidal elevation, geographical position, local depth-averaged current velocity, water temperature (with and without trend correction) and salinity. Variation in sighting rate was best described by salinity, with highest sighting rate at high levels of salinity (> 30 g kg- 1), indicating that porpoises enter the area in bodies of (more saline) North Sea water. Second best variable was time of day, with the highest sighting rate early morning, and decreasing during the day. However, surveys in the morning happened to coincide more often with high water and hence, the apparent time of day effect could be due to collinearity. Most porpoises were present in the northern part of the Marsdiep, particularly during high tide. Tide dependent sighting rates confirmed that porpoises reside in the North Sea, and enter the western Wadden Sea during the flood and leave during ebb. This tidal influx is most likely related to prey availability, which corresponds to other recent studies in this area showing higher fish abundance during high tide. Documenting information on tide related patterns could be used in practice, when e.g. planning anthropogenic activities or assessing critical habitats for this species.
Estimating the spatial position of marine mammals based on digital camera recordings
Hoekendijk, J.P.A. ; Vries, J. de; Bolt, K. van der; Greinert, J. ; Brasseur, S.M.J.M. ; Camphuysen, C.J. ; Aarts, G.M. - \ 2015
Ecology and Evolution 5 (2015)3. - ISSN 2045-7758 - p. 578 - 589.
porpoises phocoena-phocoena - harbor porpoises - habitat selection - wadden sea - north-sea - marsdiep - inlet - cetaceans - currents - density
Estimating the spatial position of organisms is essential to quantify interactions between the organism and the characteristics of its surroundings, for example, predator-prey interactions, habitat selection, and social associations. Because marine mammals spend most of their time under water and may appear at the surface only briefly, determining their exact geographic location can be challenging. Here, we developed a photogrammetric method to accurately estimate the spatial position of marine mammals or birds at the sea surface. Digital recordings containing landscape features with known geographic coordinates can be used to estimate the distance and bearing of each sighting relative to the observation point. The method can correct for frame rotation, estimates pixel size based on the reference points, and can be applied to scenarios with and without a visible horizon. A set of R functions was written to process the images and obtain accurate geographic coordinates for each sighting. The method is applied to estimate the spatiotemporal fine-scale distribution of harbour porpoises in a tidal inlet. Video recordings of harbour porpoises were made from land, using a standard digital single-lens reflex (DSLR) camera, positioned at a height of 9.59m above mean sea level. Porpoises were detected up to a distance of 3136m (mean 596m), with a mean location error of 12m. The method presented here allows for multiple detections of different individuals within a single video frame and for tracking movements of individuals based on repeated sightings. In comparison with traditional methods, this method only requires a digital camera to provide accurate location estimates. It especially has great potential in regions with ample data on local (a)biotic conditions, to help resolve functional mechanisms underlying habitat selection and other behaviors in marine mammals in coastal areas.
Tidal influence on the occurrence of the harbour porpoise Phocoena phocoena in the Marsdiep area, The Netherlands
IJsseldijk, L. ; Camphuysen, K. ; Nauw, J. ; Aarts, G.M. - \ 2014
The recent occurrence of humpback whales in the southern North Sea: a range expansion
Leopold, M.F. ; Bemmelen, R.S.A. van; Bravo Rebolledo, E. ; Franeker, J.A. van; Hesse, E. ; Kuhn, S. ; Mielke, L. ; Strietman, W.J. ; Camphuysen, K. - \ 2014
Harbour porpoises (Phocoena phocoena) in the Marsdiep area, the Netherlands: new investigations in a historical study area
Boonstra, M. ; Radstake, Y. ; Rebel, K. ; Aarts, G.M. ; Camphuysen, C.J. - \ 2013
Lutra 56 (2013)1. - ISSN 0024-7634 - p. 59 - 71.
zeezoogdieren - phocoena - monitoring - haalbaarheidsstudies - noordzee - waddenzee - marine mammals - feasibility studies - north sea - wadden sea
Na de terugkeer van bruinvissen in de Nederlandse kustwateren is er in 2010 een haalbaarheidsonderzoek uitgevoerd om na te gaan of het opnieuw de moeite waard zou kunnen zijn om bruinvissen in het Marsdiep te bestuderen. De aantallen bruinvissen die in het voorjaar van 2011 werden gezien waren groot, maar weken niet wezenlijk af van wat er, op basis van zeetrektellingen bij Huisduinen, aan aantallen bruinvissen in de afgelopen vier seizoenen werd gezien. De door Verwey waargenomen verplaatsing van bruinvissen "met het getijde mee" kon tijdens ons onderzoek niet worden bevestigd.
Waarnemingen van Bruinvissen in maart 2013 vanaf een zandzuiger in het slijkgat bij Ouddorp
Leopold, M.F. ; Baptist, M.J. ; IJsseldijk, L. ; Engels, B. - \ 2013
Den Burg : IMARES (Rapport / IMARES Wageningen UR C096/13) - 34
zeezoogdieren - mariene gebieden - beschadigingen - mortaliteit - inventarisaties - noordzee - marine mammals - marine areas - injuries - mortality - inventories - north sea
Jaarlijks spoelen in Nederland honderden bruinvissen dood aan op de kust. Onderzoek heeft laten zien dat “scherp trauma" (snij- en rijtwonden, amputaties) veelvuldig voorkomt. Vanaf 2005 hadden gemiddeld 14.4% van de gestrande bruinvissen scherp trauma, met uitschieters tot 20.5% in 2012 en 21.4% in 2010. Veel gevallen van scherp trauma worden gemeld van de kop van Goeree, in de eerste maanden van het jaar. Dieren worden hier vaak ernstig verminkt, maar in verse toestand gevonden. Dit doet vermoeden dat deze dieren vlak onder de kust gewond zijn geraakt. De eerste verminkte bruinvissen werden rond Ouddorp opgemerkt in 2006 (Leopold & Camphuysen 2006) en zijn sindsdien jaarlijks gevonden, al waren er in 2011 opvallend weinig in vergelijking met andere jaren. De aantallen lagen in 2012 en 2013 fors hoger dan in eerdere jaren.
Ship-based seabird and marine mammal surveys off Mauritania, Nov-Dec 2012: cruise report
Camphuysen, C.J. ; Spanje, T.M. van; Verdaat, J.P. - \ 2013
Den Burg (Texel) : NIOZ (Report ) - 65
Temporal variability in harbour porpoise (Phocoena phocoena) occurrence determined usning continuous passive acoustic monitoring devices
Radstake, Y. ; Aarts, G.M. ; Geelhoed, S.C.V. ; Lucke, K. ; Brasseur, S.M.J.M. ; Boonstra, M. ; Camphuysen, K. - \ 2011
Local Birds in and around the Offshore Wind Park Egmond aan Zee (OWEZ) (T-0 & T-1)
Leopold, M.F. ; Camphuysen, C.J. ; Verdaat, J.P. ; Dijkman, E.M. ; Meesters, H.W.G. ; Aarts, G.M. ; Poot, M. ; Fijn, R.C. - \ 2010
Den Burg : IMARES (Rapport / IMARES Wageningen UR C034/10) - 269
windmolens - windenergie - noordzee - zeevogels - monitoring - windmills - wind power - north sea - sea birds - monitoring
The Dutch consortium "NoordzeeWind" operates the first offshore wind farm in Dutch North Sea waters. The park, consisting of 36 turbines on monopiles, is located NW of IJmuiden harbour, some 8 NM off the Dutch mainland coast. Named after the nearest town ashore, the park will be known as "Offshore Wind farm Egmond aan Zee" (OWEZ). A second offshore wind farm has also become operational, the Princess Amalia Windfarm (PAWF). This report deals with distribution patterns of local seabirds in an area of approximately 885 km2 around the OWEZ and PAWF parks
Monitoring and researching ecological effects of Dutch offshore wind farms: Masterplan
Boon, A.R. ; Hofstede, R. ter; Klok, T.C. ; Leopold, M.F. ; Blacquiere, T. ; Poot, M.J.M. ; Kastelein, R.A. ; Camphuysen, C.J. - \ 2010
Deltares - 157
windenergie - windmolens - noordzee - nadelige gevolgen - vogels - zeezoogdieren - fauna - wind power - windmills - north sea - adverse effects - birds - marine mammals - fauna
The cabinet plans to realise a total of 6000 MW of wind energy on the Dutch Continental Shelf (DCS) by 2020 (2009 National Water Plan draft, 2009-2019 North Sea Policy Memo). Permits for twelve wind farms were issued in 2009. An interdepartmental workgroup is presently working on an approach that should result in realisation of the remaining approx. 5000 MW starting in 2011. Deltares was asked to work out the contents of a master plan for an umbrella monitoring and research programme required to fill in the gaps in information in determining the ecological effect of OWFs. (offshore wind farms)
Broedsucces van kustbroedvogels in de Waddenzee in 2007 en 2008
Kleunen, A. van; Koffijberg, K. ; Boer, P. ; Nienhuis, J. ; Camphuysen, C.J. ; Schekkerman, H. ; Oosterbeek, K.H. ; Jong, M.L. de; Ens, B.J. ; Smit, C.J. - \ 2010
Wageningen : Wettelijke Onderzoekstaken Natuur & Milieu (WOt-werkdocument 227) - 73
broedvogels - watervogels - voortplantingsvermogen - kustgebieden - monitoring - populatiedynamica - waddenzee - breeding birds - waterfowl - reproductive performance - coastal areas - monitoring - population dynamics - wadden sea
Voor het derde en vierde opeenvolgende jaar werd het broedsucces van een aantal kustbroedvogels in de Waddenzee bepaald. Van Eider, Scholekster, Kluut, Kokmeeuw, Zilvermeeuw en Visdief, alsmede van Kleine Mantelmeeuw en Noordse Stern werd informatie verzamelen over het nestsucces en uitvliegsucces (het uiteindelijke broedsucces). Kennis over de jaarlijkse variatie in broedresultaten bij de verschillende soorten is van belang als een early warning systeem om de 'kwaliteit' (het reproducerend vermogen) van de vogelpopulaties in de Waddenzee te volgen en de achterliggende processen van populatieveranderingen te doorgronden. Directe aanleiding voor het project vormde de evaluatie van de effectiviteit van het nieuwe schelpdiervisserijbeleid en de mogelijke gevolgen voor de voedselvoorziening van schelpdieretende vogels.
Alk Alca torda met halfwas jong op het Friese front, juli 2009
Geelhoed, S.C.V. ; Leopold, M.F. ; Camphuysen, K. - \ 2009
Sula : tijdschrift van de Nederlandse Zeevogelgroep 22 (2009)2. - ISSN 1876-9543 - p. 87 - 89.
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