HBO Kennisbank

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Predation pressure on zooplankton communities in the Dutch Wadden Sea

Bräuer, N. (Student); Drs, S. (Student); Stelwagen, T.

This study shows that the main predation pressure in the Dutch Wadden Sea is found to be on calanoid copepods, being the main prey item of C. harengus, A. tobianus, C. edulis, A. aurita and M. leidyi. Bivalve veligers are also found to be widely ingested by predator species, with the main predators being …

2020-08-01Natuur & LandbouwBachelor

First indication of the abundance and distribution of protected seagrass associated species in the introduced Halophila stipulacea meadows on Sint Eustatius

Weert, Y. van (Student); Wijk, D. van (Student); Rippen, J.C.; Stelwagen, T.

The present study investigated the abundance and distribution of protected seagrass associated species within the introduced Halophila stipulacea meadows on St. Eustatius. These species are the queen conch, Caribbean spiny lobster, slender seahorse, green turtle and several species of grouper (Epinephelus …

2020-08-01Natuur & LandbouwBachelor

Spatial and temporal patterns of NO3- in an island beach ecosystem utilizing UV photometry

Lässig, C. (Student); Smit, P.J.; Stelwagen, T.

Spatial and temporal patterns in submarine groundwater discharge (SGD) of nitrate in a high-energy sandy beach system on Spiekeroog Island were examined utilizing UV photometry. SGD as pathway of nitrate was studied to gain better understanding of the variability of nitrate discharge and the factors …

2019-07-07Natuur & LandbouwBachelor

Possible improvement of humpback whale (Megaptera novaeangliae) management in the Yarari Sanctuary based on Passive Acoustic Monitoring (PAM) data for habitat use

Hoogerwerf, M. (Student); Stelwagen, T.; Jager, L.C.

This thesis research aimed to answer the question whether Passive Acoustic Monitoring (PAM) data of humpback whales can improve management of the Yarari Marine Mammal Sanctuary in the Dutch Caribbean. This study looks at data recorded on the Saba Bank from December 2016 until April 2017. The PAM data …

2019-04-04Natuur & LandbouwBachelor

Achieving a more sustainable skates and rays stock management in the Greater North Sea by analysing age determination methods, length frequency discard surveydata, and current management of Raja brachyura and Raja clavata

Kruitz, S. (Student); Verboon, N. (Student); Goldsborough, D.G.; Stelwagen, T.

The species blonde ray (Raja brachyura) and thornback ray (Raja clavata) have been selected for the 2.1 InnoRays project, to get more insight about the status of these stocks in the Greater North Sea. Unstained and stained age determination methods were tested and LFQ data analysis are conducted for …

2019-04-03Natuur & LandbouwBachelor

Zeezwembad in de gemeente Harlingen

Trebert, R. (Student); Jager, L.C.; Stelwagen, T.

De gemeente Harlingen wil een zeezwembad aanleggen. Een daarvoor opgestelde projectgroep heeft drie locaties aangewezen als mogelijkheid voor een zeezwembad. Locatie 1 is het Eerste Haad, locatie 2 is de Zuiderpier en locatie 3 is de Vluchthaven. Hoofdvraag van dit onderzoek: ‘Welke van de drie geselecteerde …

2018-06-05Taal, Cultuur & KunstenBachelor

Tidal influences on the distribution of the harbour porpoise Phocoena phocoena in the Marsdiep area, the Netherlands

IJsseldijk, L.L. (Student); Strijkstra, A.M.; Stelwagen, T.

Harbour porpoises (Phocoena phocoena) are the smallest cetaceans in the North Sea. They have recovered from being rare to nowadays being present throughout the year in numbers reaching to 80 000 in the Dutch sector or the North Sea. The only area where studies were conducted prior to the disappearance …

2013-05-29Natuur & LandbouwBachelor

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