Marijke De Boer

Marijke De Boer
Wageningen University & Research | WUR · Wageningen Marine Research

PhD, MSc

About

43
Publications
13,550
Reads
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483
Citations
Citations since 2016
9 Research Items
292 Citations
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060
Introduction
Dr Marijke de Boer works as a freelance marine consultant and conducts research on marine mammals using dedicated research protocols at sea. She also works as a Marine Mammal Observer (MMO), carries out acoustic research (PAM) and conducts seabird surveys (ESAS, NERI). Her work not only takes place at sea because she also carries out desk-top consultancy services. She gives advice to offshore oil/gas industries, governmental agencies, universities and NGOs. She currently works as a guest employee at Wageningen Marine Research, Wageningen University in the Netherlands.

Publications

Publications (43)
Article
Full-text available
Recent atypical blooming events of the macroalgae Sargassum have affected humans and animals within the wider Caribbean region. Little is known how Sargassum affects marine megafauna offshore in Suriname. Data from dedicated marine megafauna surveys were pooled (2012 and 2015; May-September). A significant higher presence of Sargassum was found in...
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...
Article
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The protection of marine megafauna within Europe is rather fragmented. Developing conservation measures for highly mobile species presents definite challenges, particularly due to the many knowledge gaps. Recent studies have shown that these gaps can be filled in by Platforms of Opportunity (PO) which create low-cost approaches. However, the number...
Article
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We report records of birds in waters off Ghana and Côte d’Ivoire during two surveys, totalling 104 days, in April–May 2013 and March–May 2014. Several species were observed for which there are few or no previous records for either country, with Sooty Shearwater Ardenna grisea and Cory’s Shearwater Calonectris borealis being new for Ghana, and Leach...
Article
Full-text available
Bird observations were collected from various types of survey vessels in Suriname’s territorial waters between 2013 and 2015. Dedicated, effort-related surveys were carried out from geophysical seismic survey vessels within an area located 80–110 km offshore (in 2013) and 165–290 km (in 2015). Opportunistic observations were recorded during fisheri...
Article
Full-text available
Reports of bowhead whales (Balaena mysticetus) outside the Arctic Circle are scarce. On 15 May 2016, a juvenile bowhead whale was recorded in shallow water in Mount’s Bay (Cornwall, UK) much further south than the species’normal dis¬tribution. Fifteen months earlier, another such sighting was made involving a juvenile bow¬head whale in the shallow...
Article
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Within the Gulf of Guinea high levels of fisheries-related cetacean mortality (bycatch and direct-capture) has been documented. For locally rare species such removals could potentially lead to significant population level effects. However, information on the cetacean abundance and distribution is scarce. Similarly, it remains largely unreported whe...
Article
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Very little information exists about the cetaceans in the Guianas: Suriname and its neighboring countries Guyana and French Guiana. During a dedicated cetacean survey carried out from a geophysical seismic survey vessel in the offshore waters of Suriname (May-September 2012), the occurrence of 13 cetacean species was documented and of those, 11 wer...
Article
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Little is known about elasmobranchs along the northern coast of South America. During five boat surveys in Suriname offshore waters we visually documented the presence and behaviour of the free-ranging whale shark Rhincodon typus and two mobulid rays: the giant manta ray Manta birostris and the Chilean devil ray Mobula tarapacana. Three sightings w...
Article
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A large whale, accompanied by a calf, was seen in the shallow coastal waters off Suriname on 20 April 2013. Digital images confirmed the species identification as humpback whale Megaptera novaeangliae. This is the first confirmed record of humpback whales in Suriname. The observation was made at the extreme southern limit of the North Atlantic popu...
Article
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Several large skuas were observed during marine fauna surveys on board geophysical vessels off Ghana in May 2013 and April 2014. On three occasions the birds were photographed and identified as South Polar Skuas Stercorarius maccormicki. These are the first confirmed records for Ghana. The timing of these sightings in two consecutive years indicate...
Article
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Première observation du Pétrel de Barau Pterodroma baraui en Namibie, Atlantique sud. Un Pétrel de Barau Pterodroma baraui a été photographié à environ 96 km au large du nord de la Namibie (21°05’S 12°30’E) le 4 février 2014. C’est la première donnée pour la Namibie et seulement la deuxième pour l’Océan atlantique. C’est aussi la plus occidentale e...
Article
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The Clymene dolphin (Stenella clymene) is endemic to warm Atlantic Ocean waters and is one of the least known delphinids. We reviewed existing published data (primarily strandings, captures, and bycatch) and unpublished sightings to examine the distribution, habitat, group size, seasonality, and pigmentation patterns of Clymene dolphins within the...
Article
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The coastal Runnelstone Reef, off southwest Cornwall (UK), is characterised by complex topography and strong tidal flows and is a known high-density site for harbour porpoise (Phocoena phocoena); a European protected species. Using a multidisciplinary dataset including: porpoise sightings from a multi-year land-based survey, Acoustic Doppler Curren...
Article
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The influence of topographic and temporal variables on cetacean distribution at a fine-scale is still poorly understood. To study the spatial and temporal distribution of harbour porpoise Phocoena phocoena and the poorly known Risso's dolphin Grampus griseus we carried out land-based observations from Bardsey Island (Wales, UK) in summer (2001-2007...
Article
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The pelagic seabird fauna inhabiting the waters offshore Suriname has hardly been described. Here we provide records for the occurrence of 18 pelagic seabird species. At least three of the observed seabird species represent new state records: Yellow-nosed Albatross (Thalassarche chlororhynchos), Band-rumped Storm-Petrel (Oceanodroma castro) and Red...
Article
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Since the late 1990s, Bardsey Island has been the focus of research on the local breeding population of grey seals, Halichoerus grypus, and on the cetaceans using the surrounding waters. Here we provide a brief overview of this research to date, including details of some resulting recent substantive contributions to the scientific literature, and l...
Article
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During a systematic seabird survey in the offshore waters of Surinam, a Common Swift Apus apus was observed on 12 July 2012, c.151 nautical miles (280 km) off the coast. Based on the structural characteristics and plumage details evident in the photographs, the bird was confirmed to be a Common Swift. The clearly forked tail does not match the shor...
Conference Paper
Full-text available
The main objectives of this study were (1) to estimate the population size of Risso’s dolphins off Bardsey Island using mark-recapture techniques (De Boer et al., 2013); and (2) to study habitat-use in relation to fine-scale oceanographic features. This work provides preliminary information on the habitat-use of Risso’s dolphins and will benefit fu...
Article
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A photo-identification study on Risso's dolphins was carried out off Bardsey Island in Wales (July to September, 1997-2007). Their local abundance was estimated using two different analytical techniques: (1) mark-recapture of well-marked dolphins using a 'closed-population' model; and (2) a census technique based on the total number of identified i...
Article
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During offshore and onshore studies (2004 to 2009), the interactions between pair-trawls and short-beaked common dolphins (Delphinus delphis) were studied to better understand the impact of bycatch. A ‘hotspot’ area where pair-trawls overlapped with high dolphin abundance was identified. We made comparisons between boat-based data collected in abse...
Article
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Information on cetaceans off Gabon in tropical West Africa is summarized from boat-based surveys carried out between 7 March and 7 August 2009. Thirteen cetacean species were positively identified comprising two baleen whale species, one sperm whale species and ten species of delphinid. Bryde's whale (Balaenoptera brydei) and humpback whale (Megapt...
Article
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Minke whales were recorded in the central North Sea in an area characterised by frontal features and high productivity northeast of the Dogger Bank (4677 km(2)). Survey efforts were carried out from 28 March to 2 July 2007, at a finer scale than in earlier studies in the region, using 2 vessels as platforms of opportunity and a dedicated line-trans...
Article
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In June 2009, a white rough-toothed dolphin (Steno bredanensis) calf was photographed in a group of at least 50 dolphins in the southern Gulf of Guinea, 95 nauticol miles off the Gabon coast (01°45′S 007°29′E), West Africa. Reports of unusually pigmented cetaceans are infrequent and this record represents the first of an all-white rough-toothed dol...
Article
Full-text available
A survey using line-transect techniques was conducted during two winters providing the first estimates of common dolphin, Delphinus delphis, abundance (number of dolphins) on winter pelagic trawl fishing grounds in the English Channel. Independent teams of observers searched with binoculars or naked eye. These methods were intended to allow for the...
Book
Full-text available
This paper presents a synthesis of mainly published information relating to the cetaceans of the Indian Ocean Sanctuary (IOS). It highlights a number of new studies and other initiatives linked to the Sanctuary and reviews the current understanding of the biology of the Sanctuary’s cetaceans. Cetaceans in the IOS are exposed to a range of threats,...
Conference Paper
During the Antarctic summers of 1998/1999 and 1999/2000, cetacean research was conducted in the Southern Ocean. A total of 44 beaked whale sightings were made, involving approximately 67 individuals in 5 different genera. Observations of identifying features, behaviour and oceanographic data are summarised.
Article
Full-text available
Information on cetaceans in the Indian Ocean Sanctuary and the South China Sea is summarised from a cruise carried out from 29 March to 17 April 1999. Ten species were positively identified: finless porpoise, pantropical spotted dolphin, spinner dolphin, sperm whale, melon-headed whale, pygmy killer whale, false killer whale, Cuvier’s beaked whale,...
Article
Full-text available
Mixtures of harmful and harmless algae were grown in discontinuously diluted batch cultures under ammonium, nitrate and phosphate limitation, and at different irradiances (20–500 μjnol quanta m−2 s−1). The species used were Chrysochromulina polylepis, Emiliania huxleyi type B, Rhodomonas sp., the dinoflagellales Fibrocapsa japonica, Gymnodinium sim...

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Projects (4)
Project
Enhance and strengthen protection of Suriname’s marine resources through participatory spatial planning, targeted capacity building, and compelling data to produce win-win outcomes that conserve biodiversity and enhance food security, and support socio-economic development compatible with ocean health.