Steve C.V. Geelhoed

Steve C.V. Geelhoed
Wageningen University & Research | WUR · Wageningen Marine Research

MSc

About

94
Publications
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Introduction
Steve’s research focusses on abundance, distribution,and habitat use of seabirds and cetaceans, and human interaction with these species. Study areas range from the tropics to arctic regions, with a focus on the North Sea. Currently, also working in bat migration across the North Sea in relation to offshore wind farms.

Publications

Publications (94)
Article
Full-text available
Persistent organic pollutants (POPs), including polychlorinated biphenyls (PCBs), polybrominated diphenylethers (PBDEs) and hexachlorobenzene (HCB), bioaccumulate in marine ecosystems. Top predators contain high levels of POPs in their lipid-rich tissues, which may result in adverse effects on their reproductive, immune and endocrine functions. Har...
Article
Full-text available
Bats regularly migrate over the North Sea, but information on the environmental conditions when this occurs is scarce. Detailed information is urgently needed on the conditions under which bats can be expected offshore, as the number of offshore windfarms that can cause fatalities amongst bats in the North Sea is increasing rapidly. We performed ul...
Article
Full-text available
The Black-capped Petrel Pterodroma hasitata is a pelagic seabird with a dangerously small population size. Remaining breeding sites are threatened by habitat loss, introduced predators, and direct harvesting. The species likely also faces several threats at sea, but because knowledge on its distribution range and ecology is meagre at best, it is ch...
Article
Full-text available
The harbour porpoise (Phocoena phocoena) is the most abundant marine mammal species in Dutch waters. Aerial surveys along predesigned track lines in 2012-2017 provided density and abundance estimates for the Dutch Continental Shelf (DCS) in spring (Mar/Apr 2012, 2013) and summer (Jul 2014, 2015, 2017). The abundance estimates in spring (n=63,408-66...
Article
Full-text available
Effective species conservation and management requires information on species distribution patterns, which is challenging for highly mobile and cryptic species that may be subject to multiple anthropogenic stressors across international boundaries. Understanding species-habitat relationships can improve the assessment of trends and distribution by...
Article
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The Northeast Atlantic, a highly productive maritime area, has been exposed to a wide range of direct human pressures, such as fishing, shipping, coastal development, pollution, and non-indigenous species (NIS) introductions, in addition to anthropogenically-driven global climate change. Nonetheless, this regional sea supports a high diversity of s...
Technical Report
Full-text available
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.
Technical Report
Full-text available
This report provides an assessment of the feasibility of using a Passive Acoustic Monitoring (PAM) network on the Dutch Continental Shelf (DCS) to monitor harbour porpoises. It provides a description of what static PAM is currently able to do. It gives an overview of the technical and logistical requirements when using PAM at sea and the analytical...
Article
Full-text available
Distribution maps of cetaceans and seabirds at basin and monthly scales are needed for conservation and marine management. These are usually created from standardised and systematic aerial and vessel surveys, with recorded animal densities interpolated across study areas. However, distribution maps at basin and monthly scales have previously not be...
Article
Full-text available
In the Caribbean Sea, mesoscale anticyclonic ocean eddies impact the local ecosystem by mixing of low salinity river outflow with the nutrient‐rich waters upwelling along the Venezuelan and Colombian coast. To gain insight into the physics and the ecological impact of these anticyclones, we performed a combined hydrographic and biological survey of...
Conference Paper
Harbour porpoises (Phocoena phocoena) are regularly monitored to assess how they are impacted by the construction and operation of offshore wind farms. A suitable method to do this is passive acoustic monitoring (PAM) by stationary hydrophones, for example CPODs. These devices provide information on echolocation click activity, which can then be an...
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
In accordance with the monitoring and evaluation plan (MEP) for the ‘Gemini Offshore Wind Farm’ ecological monitoring of harbour porpoises was carried out, concerning the distribution, especially distance and numbers, of harbour porpoises around the wind farm during the first construction phase with pile driving of the fundaments (T-c), without noi...
Article
Full-text available
Passive acoustic monitoring (PAM) was used to study the occurrence and distribution of feeding behaviour of harbour porpoises (Phocoena phocoena) in the Ems estuary, on the border between the Netherlands and Germany. Occurrence was expressed as detection positive hours (DPH) per month or station, and feeding behaviour was described as feeding buzz...
Article
Full-text available
The Lesser Black-backed Gull, Larus fuscus Linnaeus, 1758, is a surface feeder with a broad prey spectrum that forages in the North Sea on subsurface pelagic fishes and crabs swimming within 0.6 m of the sea surface. In July 2006 and in July/August 2009, we surveyed the Frisian Front area in the southern North Sea (53.4°N–54.3°N, 4.0°E–5.5°E) to de...
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
The so-called FaunaGuard-PM (FG-PM) has been developed to deter harbour porpoises from localised offshore anthropogenic activities in order to minimize potential negative effects of these activities on porpoise hearing. The efficiency of the FG-PM was tested in a pool and the distance up to which it would deter porpoises in the field has been model...
Article
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The ocean sunfish, Mola mola, is the largest teleost fish in the world. Despite being found in all oceans of the world, little is known about its abundance and factors driving its distribution. In this study we provide the first abundance estimates for sunfish in offshore waters in the northeast Atlantic and the first record of extensive sunfish pr...
Poster
Full-text available
The combined method of passive acoustic and visual monitoring has proven successful for studying elusive harbour porpoises (Phocoena phocoena). However, to convert the recorded numbers of echolocation clicks to densities, detectability estimates are needed. So far, the estimated best detection distance is between 22-107m (Tougaard et al., 2006; Kos...
Article
Full-text available
Anthropogenic sound in the marine environment can have negative consequences for marine fauna. Since most sound sources are intermittent or continuous, estimating how many individuals are exposed over time remains challenging, as this depends on the animals’ mobility. Here we explored how animal movement influences how many, and how often, animals...
Article
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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...
Technical Report
Full-text available
In this study information was gathered n the following topics: 1. The extent of seismic surveys on the Dutch continental shelf; 2. Potential effects on harbour porpoises; 3. Mitigation measures; 4. Identification of knowledge gaps and their prioritization for future research.
Conference Paper
Full-text available
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
Full-text available
Knowledge on the density, distribution and occurrence of whales and dolphins in the Caribbean Netherlands is sparse. This knowledge is needed as basic input for conservation and management of cetaceans in the area. Especially in the long term, dedicated data is needed to provide a base-line for monitoring the effect of policy decisions, such as a p...
Technical Report
Er zijn plannen om in zes van de tien spuikokers van het spuisluiscomplex van Kornwerderzand in totaal 18 Tocardo getijturbines turbines te installeren. Deze turbines zullen energie winnen uit de sterke stroming die bij het spuien van overtollig water vanuit het IJsselmeer naar de Waddenzee in de spuikokers ontstaat. Deze turbines vormen door poten...
Technical Report
Full-text available
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...
Conference Paper
Full-text available
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
Full-text available
IMARES Wageningen UR, Report number C016/14
Technical Report
Full-text available
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...
Technical Report
Full-text available
Information on the distribution, abundance and ecology of marine mammal in the Wider Caribbean Region is scarce. This report aims at collating the on-going research in the Wider Caribbean Region, at identifying the most critical knowledge gaps that need to be addressed to inform and facilitate conservation actions and assess the most suitable resea...
Technical Report
Full-text available
In March/April 2013 aerial surveys to estimate the abundance of Harbour porpoises Phocoena phocoena on the Dutch Continental Shelf were conducted. These surveys were conducted along predetermined track lines using distance sampling methods in four areas: A “Dogger Bank”, B “Offshore”, C “Frisian Front” & D “Delta”. Between 18 March and 22 April the...
Technical Report
Full-text available
Begin 2014 zijn twee surveys uitgevoerd in het gebied rond de Bruine Bank. De surveys waren enerzijds gericht op het in kaart brengen van de verspreiding van vogels en anderzijds op het in kaart brengen van potentiele prooisoorten. Toetsing van deze schattingen samen met alle oudere beschikbare goede aantalsschattingen aan het vernieuwde beleidskad...
Technical Report
Full-text available
IMARES Wageningen UR, Report number C054/13
Technical Report
Full-text available
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...
Article
Full-text available
The harbour porpoise (Phocoena phocoena) is the most abundant marine mammal species in Dutch waters. Nevertheless until 2010 abundance estimates for the entire Dutch Continental Shelf (DCS) were missing. Aerial surveys along designed track lines in July 2010, October/November 2010 and March 2011 provided density and abundance estimates for the DCS....
Technical Report
The Dutch offshore industry has the ambition to execute operations on a large scale in Arctic areas, for instance for installation and operation of oil- and gas production facilities and pipelines. Currently, there is no standard for safe operations by service companies in Arctic offshore areas. Therefore a Joint Industry Project (JIP) was started...