Results 41 to 50 of about 1,782 (197)

Silent porpoise: potential sleeping behaviour identified in wild harbour porpoises

Animal Behaviour, 2017
All animals sleep and it is essential for maintaining optimal brain function. However, cetaceans engage in the unusual practice of unihemispherical sleep, where only half of their brain sleeps at a time, due to their constant need for movement and breathing. Most studies of sleep in cetaceans have occurred in captivity.
Andrew J. Wright, Tomonari Akamatsu, Kim N. Mouritsen, Signe Sveegaard, Rune Dietz, Jonas Teilmann   +5 more
openaire   +3 more sources

To ping or not to ping : the use of active acoustic devices in mitigating interactions between small cetaceans and gillnet fisheries [PDF]

, 2013
Active sound emitters (‘pingers’) are used in several gillnet fisheries to reduce bycatch of small cetaceans, and/or to reduce depredation by dolphins. Here, we review studies conducted to determine how effective these devices may be as management tools.
Read, Andrew, SM Dawson, Northridge, Simon Patrick, S Northridge, D Waples, AJ Read, Dawson, Steve, Waples, Danielle   +7 more
core   +1 more source

Simulated seal scarer sounds scare porpoises, but not seals: species-specific responses to 12 kHz deterrence sounds [PDF]

Royal Society Open Science, 2017
Acoustic harassment devices (AHD) or ‘seal scarers’ are used extensively, not only to deter seals from fisheries, but also as mitigation tools to deter marine mammals from potentially harmful sound sources, such as offshore pile driving.
Lonnie Mikkelsen, Line Hermannsen, Kristian Beedholm, Peter Teglberg Madsen, Jakob Tougaard   +4 more
doaj   +1 more source

Whale lice (Isocyamus deltobranchium & Isocyamus delphinii; Cyamidae) prevalence in odontocetes off the German and Dutch coasts – morphological and molecular characterization and health implications

International Journal for Parasitology: Parasites and Wildlife, 2021
Whale lice (Cyamidae; Amphipoda) are ectoparasitic crustaceans adapted to the marine environment with cetaceans as their host. There are few reports of cyamids occurring in odontocetes from the North Sea, and long-term studies are lacking.
Kristina Lehnert, Lonneke L. IJsseldijk, May Li Uy, Joy Ometere Boyi, Linde van Schalkwijk, Eveline A.P. Tollenaar, Andrea Gröne, Peter Wohlsein, Ursula Siebert   +8 more
doaj   +1 more source

Multiple insights into the reproductive function of harbour porpoises (Phocoena phocoena): An ongoing study

NAMMCO Scientific Publications, 2003
The harbour porpoises kept at the Fjord & Bælt since April 1997 offer a unique opportunity to gain a better understanding of the reproductive function in harbour porpoises, especially in terms of physiological cycle and concomitant behavioural traits.
Geneviève Desportes, Jakob H Kristensen, Deborah Benham, Sandie Wilson, Trine Jepsen, Bodil Korsgaard, Ursula Siebert, Jörg Driver, Mats Amundin, Kirstin Hansen, Gwyneth Shephard   +10 more
doaj   +1 more source

Assessment of Harbour Porpoise Bycatch along the Portuguese and Galician Coast: Insights from Strandings over Two Decades

Animals, 2023
The Iberian harbour porpoise population is small and fisheries bycatch has been described as one of its most important threats. Data on harbour porpoise strandings collected by the Portuguese and Galician stranding networks between 2000 and 2020 are ...
Andreia Torres-Pereira, Hélder Araújo, Silvia Silva Monteiro, Marisa Ferreira, Jorge Bastos-Santos, Sara Sá, Lídia Nicolau, Ana Marçalo, Carina Marques, Ana Sofia Tavares, Myriam De Bonis, Pablo Covelo, José Martínez-Cedeira, Alfredo López, Marina Sequeira, José Vingada, Catarina Eira   +16 more
doaj   +1 more source

The feasibility of tagging harbour porpoises in Dutch waters

, 2016
The tagging of harbour porpoise (Phocoena phocosena) with satellite-linked locators or time-depth recorders allows researchers to obtain data on the behaviour and ecology of this species. It is also a valuable tool to investigate the impact of human activities on individuals and a number of recent publications have highlighted that for porpoises in ...
Scheidat, M., Bos, O.G., Geelhoed, S.C.V.   +2 more
openaire   +2 more sources

Harbour porpoises (Phocoena phocoena) and wind farms: a case study in the Dutch North Sea

, 2011
The rapid increase in development of offshore wind energy in European waters has raised concern for the possible environmental impacts of wind farms. We studied whether harbour porpoise occurrence has been affected by the presence of the Dutch offshore ...
Scheidat, M., Teilmann, J., Brasseur, S.M.J.M., Reijnders, P.J.H., Carstensen, J., van Polanen Petel, T., Polanen Petel, T., van, Tougaard, J.   +7 more
core   +1 more source

A novel cetacean adenovirus in stranded harbour porpoises from the North Sea: detection and molecular characterization [PDF]

, 2017
International audienceHarbour porpoises (Phocoena phocoena) are the most prevalent cetaceans in the North Sea. The fecal viral flora of 21 harbour porpoises stranded along the Dutch coastline was analyzed by a metagenomics approach.
Marco W. G. van de Bildt, van Beurden, Steven J., Penzes, Judit J, Gröne, Andrea, dPB I&I, Lineke Begeman, IJsseldijk, Lonneke L, Andrea Gröne, Thomas B. Waltzek, van de Bildt, Marco W. G., Waltzek, Thomas B., dPB CR, Penzes, Judit J., LS Pathologie, Judit J. Penzes, M. Hélène Verheije, Geert de Vrieze, Thijs Kuiken, Kuiken, Thijs, van de Bildt, Marco W.G., Verheije, M Hélène, Lonneke L. IJsseldijk, Applied Veterinary Research, van Beurden, Steven J, van de Bildt, Marco W G, Wellehan, James F. X., Veterinair Pathologisch Diagnostisch Cnt, Wellehan, James F.X. Jr, Waltzek, Thomas B, de Vrieze, Geert, Begeman, Lineke, Wellehan, James F X, IJsseldijk, Lonneke L., James F. X. Wellehan, Steven J. van Beurden, Verheije, M. Hélène   +35 more
core   +1 more source

Polluted porpoises: Generational transfer of organic contaminants in harbour porpoises from the southern North Sea

Science of The Total Environment, 2021
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. Harbour
van den Heuvel-Greve, Martine J., van den Brink, Anneke M., Kotterman, Michiel J.J., Kwadijk, Christiaan J.A.F., Geelhoed, Steve C.V., Murphy, Sinéad, van den Broek, Jan, Heesterbeek, Hans, Gröne, Andrea, IJsseldijk, Lonneke L.   +9 more
openaire   +3 more sources