Marine Mammal Science (2017)
...There is, unfortunately, no unbiased way to assess the prey preference and dietary intake of free-ranging marine mammals like harbor porpoises. Although the traditional approach involving stomach content analysis of…
A novel cetacean adenovirus in stranded harbour porpoises from the North Sea: Detection and molecular characterization
van Beurden, Steven J.; IJsseldijk, Lonneke L.; van de Bildt, Marco W. G.; Begeman, Lineke; Wellehan, James F. X.; Waltzek, Thomas B.; de Vrieze, Geert; Gröne, Andrea; Kuiken, Thijs; Verheije, M. Hélène; Penzes, Judit J.
Archives of Virology (2017)
Harbour 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…
Diurnal variation in harbour porpoise detection – Potential implications for management
Williamson, L. D.; Brookes, K. L.; Scott, B. E.; Graham, I. M.; Thompson, P. M.
Marine Ecology Progress Series (2017)
Robust information on animal distributions and foraging behaviour is required to target management and conservation measures for protected species and populations. Visual survey data are commonly used to model these…
Two techniques of age estimation in cetaceans: GLGs in teeth and earplugs, and measuring the AAR rate in eye lens nucleus
Nielsen, Nynne H; Víkingsson, Gísli A.; Hansen, Steen H.; Ditlevsen, Susanne; Heide-Jørgensen, Mads Peter
NAMMCO Scientific Publications (2017)
The ages of three species of cetaceans were estimated by counting the growth layer groups (GLG) and measuring the aspartic acid racemization rate (kAsp) by what is referred to as…
Precocious hearing in harbour porpoise neonates
Wahlberg, Magnus; Delgado-García, Lara; Kristensen, Jakob H.
Journal of Comparative Physiology A (2017)
Hearing is the primary sensory modality for toothed whales, but it is not known at which age it is fully developed. For newborn calves, hearing could fill an important function…
Population- and growth-related differences in helminthic fauna of finless porpoises (Neophocaena asiaeorientalis) in five Japanese populations
Shiozaki, Akira; Amano, Masao
Journal of Veterinary Medical Science (2017)
A survey of helminths and ectoparasites, including epizoits, was conducted in narrow-ridged finless porpoises (Neophocaena asiaeorientalis) from Japanese five populations using dead stranded or incidentally caught animals. In total, 13…
Estimation of population size and trends for highly mobile species with dynamic spatial distributions
Boyd, Charlotte; Barlow, Jay; Becker, Elizabeth A.; Forney, Karin A.; Gerrodette, Tim; Moore, Jeffrey E.; Punt, André E.
Diversity and Distributions (2017)
Conventional spatial density models assume a constant relationship between densities and habitat covariates over some time period, typically a survey season. The estimated population size must change whenever total habitat…
Genital interactions during simulated copulation among marine mammals
Orbach, Dara N.; Kelly, Diane A.; Solano, Mauricio; Brennan, Patricia L. R.
Proceedings of the Royal Society B: Biological Sciences (2017)
Genitalia are morphologically variable across many taxa and in physical contact during intromission, but little is known about how variation in form correlates with function during copulation. Marine mammals offer…
Temporary hearing threshold shift in a harbor porpoise (Phocoena phocoena) after exposure to multiple airgun sounds
Kastelein, Ronald A.; Helder-Hoek, Lean; Van de Voorde, Shirley; von Benda-Beckmann, Alexander M.; Lam, Frans-Peter A.; Jansen, Erwin; de Jong, Christ A. F.; Ainslie, Michael A.
The Journal of the Acoustical Society of America (2017)
In seismic surveys, reflected sounds from airguns are used under water to detect gas and oil below the sea floor. The airguns produce broadband high-amplitude impulsive sounds, which may cause…
Ultrasonography of mammary glands in finless porpoises (Neophocaena asiaeorientalis) at different reproductive stages
Zeng, Xianyuan; Huang, Shiang-Lin; Hao, Yujiang; Wang, Ding; Ji, Junhua; Deng, Xiaojun; Nabi, Ghulam
Marine Mammal Science (2017)
...The Yangtze finless porpoise (Neophocaena asiaeorientalis asiaeorientalis), endemic to the middle and lower reaches of the Yangtze River and the adjoining Poyang and Dongting lakes (Gao and Zhou 1993), is…