Hans Verdaat

Hans Verdaat
Wageningen University & Research | WUR · Wageningen Marine Research

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About

76
Publications
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Introduction
Researcher (sea)bird & marine mammal and survey coordinator for surveys in the Wadden Sea, North Sea, West Africa, Arctic, Antarctica and Dutch Caribbean at Wageningen Marine Research in Den Helder, The Netherlands.
Additional affiliations
September 2006 - present
Wageningen University & Research
Position
  • Researcher

Publications

Publications (76)
Article
Wahlberg’s Eagle Aquila wahlbergi is an African raptor species distributed south of the Sahara. The first Western Palearctic (WP) record was on 3 May 2013, when a pale-morph juvenile was photographed on the west coast of Gulf of Suez near Ras Shuqeir, c 120 km north of Hurghada, Red Sea, Egypt. This paper documents the second and third WP record (‘...
Technical Report
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Aerial surveys to estimate the abundance of Harbour Porpoise Phocoena phocoena were conducted on the Dutch Continental Shelf in summer 2019. These surveys followed predetermined track lines in four areas: A - Dogger Bank, B - Offshore, C - Frisian Front & D - Delta. Between 16 July and 4 August the entire Dutch Continental Shelf (DCS) was surveyed.
Article
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The subpopulation of the bowhead whale Balaena mysticetus in the East Greenland-Svalbard-Barents Sea is endangered and until recently was believed to number in the tens. Recent studies have suggested that this subpopulation appears to be increasing. Here, we report on unusual aggregations of bowhead whales within the Fram Strait. We present opportu...
Technical Report
Full-text available
In July 2018 aerial surveys to estimate the abundance of Harbour Porpoise Phocoena phocoena were conducted on the Dutch Continental Shelf. These surveys followed predetermined track lines in four areas: A - Dogger Bank, B - Offshore, C - Frisian Front & D - Delta. Between 13 and 18 July the entire Dutch Continental Shelf (DCS) was surveyed. Marin...
Technical Report
Full-text available
Pilot field study: observations from a fixed platform on occurrence and behaviour of common guillemots and other seabirds in offshore wind farm Luchterduinen Leopold, Mardik F. ; Verdaat, Hans J.P. (2018) IJmuiden : Wageningen Marine Research, (Wageningen Marine Research rapport C068/18) - 27 http://edepot.wur.nl/460411
Technical Report
Full-text available
In July 2017 aerial surveys to estimate the abundance of Harbour Porpoise Phocoena phocoena were conducted on the Dutch Continental Shelf. These surveys followed predetermined track lines in four areas: A - Dogger Bank, B - Offshore, C - Frisian Front & D - Delta. Between 7 and 18 July the entire Dutch Continental Shelf (DCS) was surveyed. Marine...
Technical Report
Full-text available
Cruiserapport scheepstellingen van zeevogels op het Friese Front en op de Bruine Bank, 2017 Geelhoed, S.C.V. ; Lagerveld, S. ; Leopold, M.F. ; Verdaat, J.P. (2018) Den Helder : Wageningen Marine Research, (Wageningen Marine Research rapport C035/18) - 38 http://edepot.wur.nl/449007
Technical Report
Full-text available
Monitoring van gewone en grijze zeehonden in de Nederlandse Waddenzee, 2002-2017 Cremer, J.S.M. ; Brasseur, S.M.J.M. ; Meijboom, A. ; Schop, J. ; Verdaat, J.P. (2017) Wageningen : Wettelijke Onderzoekstaken Natuur & Milieu, (WOt-technical report 104) - 38 http://edepot.wur.nl/428796
Article
Full-text available
The occurrence of basking sharks in the Caribbean Sea is only recently documented by satellite tagging studies, which show that some individuals migrate through the region en route from waters off the east coast of the USA to waters off northeastern South-America. The observation of a basking shark on 7 November 2013 ca. 130 km north-northeast of A...
Article
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The avifauna of the Dutch Caribbean island of St. Eustatius has been little studied. We document 22 new bird species for the island and update the status of several important species based on our recent observations. The documented avifauna of the island amounts to 75 published species records. We conclude by pointing out several positive developme...
Conference Paper
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During the RV Polarstern PS 89 (ANT-XXX/2) expedition from Cape Town to Atka Bay and back, 20 sightings of 26 individual blue whales (Balaenoptera musculus) were recorded in Antarctic waters west of the Greenwich Meridian between 16-20 January 2015. These observations suggest a more westerly extension of a reported hot spot between the Greenwich Me...
Technical Report
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Voor de Noordzeekust van de zuidpunt Texel (nabij Hoornderslag) verbleven in 2013 laat in het voorjaar record aantallen zwarte zee-eenden. In de eerste helft van 2014 werden opnieuw grote aantallen zwarte zee-eenden bij Texel geteld. Een dergelijke situatie kan alleen voortduren wanneer ter plaatse voldoende geschikt voedsel aanwezig is om aan de d...
Technical Report
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In accordance with the monitoring and evaluation plan (MEP) for the ‘Gemini Offshore Wind Farm’ the ecological monitoring of harbour porpoises was carried out by IMARES and IBL Umweltplanung, concerning the distribution and numbers of harbour porpoises in and around the wind farm prior to construction (T-0). For this purpose aerial surveys as well...
Article
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Vleermuizen in Nederlandse offshore windparken in het najaar van 2012
Article
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Little is known about migration patterns and seasonal distribution away from coastal summer feeding habitats of many pelagic baleen whales. Recently, large-scale passive acoustic monitoring networks have become available to explore migration patterns and identify critical habitats of these species. North Atlantic minke whales (Balaenoptera acutoros...
Conference Paper
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Little is known about the distribution of small cetaceans in the offshore areas of the North Sea. However, information on abundance and distribution is essential to assess the impact of climate change and other anthropogenic stressors, to infer on the conservation status and to identify areas of high ecological importance for the species involved....
Technical Report
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IMARES Wageningen UR, Report number C016/14
Technical Report
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In November 2013 aerial surveys were conducted for the first time in the Exclusive Economic Zone of Aruba, Curaçao and Bonaire to evaluate aerial surveys as a tool for marine mammal surveys in these waters, and to assess the distribution and abundance of marine mammals. A secondary aim of these surveys was to collect data on the occurrence of other...
Article
Full-text available
Background - Little is known about migration patterns and seasonal distribution away from coastal summer feeding habitats of many pelagic baleen whales. Recently, large-scale passive acoustic monitoring networks have become available to explore migration patterns and identify critical habitats of these species. North Atlantic minke whales (Balaenop...
Technical Report
Full-text available
Marine mammals spend most of their time underwater which sometimes makes it difficult to detect them from the surface. At the same time, most cetaceans (toothed and baleen whales) produce a variety of sounds underwater and since sound travels easily in water, these sounds can normally be picked up even at distances beyond those of visual detection....
Technical Report
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IMARES Wageningen UR, Report number C054/13
Technical Report
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De Vogelrichtlijn (VR) verplicht Nederland tot het in stand houden of in gunstige staat van instandhouding brengen van alle in het wild voorkomende vogels. Over de staat van instandhouding wordt eens in de drie jaar aan Brussel gerapporteerd. Voor de beoordeling van de staat van instandhouding van vogelsoorten is onder andere informatie gewenst met...
Technical Report
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IMARES report number C026/13 / tFC report number 20120402 Publication date: 13 th February, 2013
Technical Report
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De jaarlijkse monitoring van de gewone (Phoca vitulina) en de grijze zeehonden (Halichoerus grypus) in de Waddenzee dient ter ondersteuning van het (internationaal) beheer van en het beleid voor de zeehondenpopulaties. Deze tellingen worden sinds 1960 door IMARES uitgevoerd in opdracht van het ministerie van Economische Zaken. In 2012 werden in de...
Technical Report
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This research project aimed at mapping avifauna and cetaceans along the shelf break was carried out during a unique period of extremely low fishing activity of the industrial fleet. This allowed the researchers to describe the distribution and feeding ecology of wintering seabirds, marine mammals and other mega fauna in Mauritanian waters in an alm...
Technical Report
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In October 2011 an expedition took place to the Saba Bank, on board of the ship the Caribbean Explorer II. Main aim of the expedition was collecting data on underwater fauna and coral reefs. Apart from that data were collected on nutrients, water flow, sponges and seabirds and marine mammals. Data on the last group were collected by deploying acous...
Article
To investigate harbour porpoise density and distribution in Dutch waters, dedicated line transect distance sampling aerial surveys were conducted from May 2008 to March 2010. In total 10,557 km were covered on survey effort during 16 survey days in February to May, August, November and December. Using line-transect distance sampling techniques, por...
Technical Report
Full-text available
Assessment of the Effects of the Offshore wind Farm Egmond aan Zee (OWEZ) for Harbour Porpoise (comparison T0 and T1) Scheidat, M. ; Aarts, G.M. ; Bakker, A.G. ; Brasseur, S.M.J.M. ; Carstensen, J. ; Leeuwen, P.W. van; Leopold, M.F. ; Polanen-Petel, T. van; Reijnders, P.J.H. ; Teilmann, J. ; Tougaard, J. ; Verdaat, J.P. (2012) IJmuiden : IMARES, (R...
Article
Full-text available
Distance sampling surveys for cetaceans in Antarctic waters Lehnert, L.S. ; Geelhoed, S.C.V. ; Gray, I. ; Lehnert, K. ; Plon, S. ; Schmidt, K. ; Verdaat, J.P. ; Gilles, A. ; Herr, H. ; Siebert, U. (2012) Berichte zur Polar- und Meeresforschung 646 . - p. 51 - 55.
Technical Report
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Vogeltellingen Bruine Bank Januari 2012 Witte, R.H. ; Verdaat, J.P. (2012) Den Helder : IMARES, (Rapport / IMARES C019/12) - 15 p.
Article
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Dorien A.M. Verheyen, Hans Verdaat, Jooske IJzer, Sophie M.J.M. Brasseur & Mardik Leopold
Technical Report
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Pagina 2 van 13 Report number C062/12 IMARES is: • Wageningen IMARES conducts research providing knowledge necessary for the protection, harvest and usage of marine and coastal areas. • Wageningen IMARES is a knowledge and research partner for governmental authorities, private industry and social organisations for which marine habitat and resources...
Article
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Nieuwe kolonie Drieteenmeeuwen Rissa tridactyla in de zuidelijke Noordzee Geelhoed, S.C.V. ; Bemmelen, R.S.A. van; Keijl, G.O. ; Leopold, M.F. ; Verdaat, J.P. (2011) Sula : tijdschrift van de Nederlandse Zeevogelgroep 24 (1). - p. 27 - 30.
Technical Report
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Shortlist Masterplan wind Aerial surveys of harbour popoises on the Dutch Continental Shelf Geelhoed, S.C.V. ; Scheidat, M. ; Aarts, G.M. ; Bemmelen, R.S.A. van; Janinhoff, N. ; Verdaat, J.P. ; Witte, R.H. (2011) Den Helder : IMARES, (Report C103/11) - 46 p.
Article
The razor clam Ensis directus was introduced to Europe presumably as larvae in ballast water around 1978. Starting in the German Bight it spread northward and southward along the continental coastline. Currently it is the most common shellfish species in the Dutch coastal zone, where it mainly occurs in the Voordelta and off the Wadden Sea islands....
Technical Report
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Vogeltellingen Bruine Bank september 2010 Bemmelen, R.S.A. van; Verdaat, J.P. (2010) Den Helder : IMARES, (Rapport C132/10) - 16 p.
Article
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Helicopter and shipboard surveys were conducted for cetaceans in the Weddell Sea from the German research vessel ‘Polarstern’. The first survey in 2006/07 started south of South Africa, went to Neumayer Station in Atka Bay (70°29.6’ S/07°57.6’ W), crossed the Weddell Sea from Neumayer to south of Elephant Island and worked around the South Shetland...
Article
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JANINHOFF, N., VERDAAT, H., van FRANEKER, J.A. (2010): Rosse Franjepoot (Phalaropus fulicaria) fourageert in plastic soep (Grey Phalarope foraging in plastic soup) Sula 23(1), S. 41-45. Nederlandse Zeevogelgroep (NZG).
Technical Report
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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...
Article
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Uit eerdere rapportages is gebleken dat franjepoten vaak plastic in de maag hebben (Tabel 1). Het onderscheid tussen goed voedsel en gevaarlijke rommel in vervuilde stroomnaden is ook voor Rosse Franjepoten blijkbaar niet altijd duidelijk. Mogelijk kunnen franjepoten, net als sommige andere steltlopers, wel braakballen produceren om onverteerbare r...
Technical Report
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Voor de Noordwijkse boulevard verbleef in november/december 2009 een groep van enkele honderden Zwarte Zee-eenden. In Noordwijk bevindt zich een zeetrektelpost van de Nederlandse Zeevogelgroep en hier worden dagelijks, in de ochtenduren, passerende en lokaal pleisterende zeevogels geregistreerd. De eenden waren neergestreken in een gebied waar in h...
Technical Report
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Aerial surveys were conducted to investigate harbour porpoise density and distribution in Dutch waters. Surveys were conducted following standard line transect distance sampling methodology on tracklines providing a representative coverage of the study area which ranged from the Dutch coast to about 120 km offshore thus covering about half of the D...
Technical Report
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De Nederlandse overheid heeft in november 2005 een referentiegebied ingesteld om te voldoen aan de internationale verplichting dat voldoende grote gebieden in de Waddenzee worden aangewezen waarbinnen geen exploitaties en verstorende activiteiten mogen plaatsvinden. In dit project wordt de nadruk gelegd op het volgen van de ontwikkeling van het eco...