Results 61 to 70 of about 3,221 (159)

Stay close, but not too close: aerial image analysis reveals patterns of social distancing in seal colonies

Royal Society Open Science, 2023
Many species aggregate in dense colonies. Species-specific spatial patterns provide clues about how colonies are shaped by various (a)biotic factors, including predation, temperature regulation or disease transmission.
J. P. A. Hoekendijk, A. Grundlehner, S. Brasseur, B. Kellenberger, D. Tuia, G. Aarts   +5 more
doaj   +1 more source

Nocturnal Haul‐Out Behavior of Rehabilitated Gray Seal Juveniles (Halichoerus grypus) in the Baltic Sea

Marine Mammal Science, Volume 42, Issue 3, July 2026.
ABSTRACT Haul‐out behavior is a key component of the behavioral ecology of pinnipeds and serves essential resting functions. Various intrinsic and extrinsic factors have been shown to determine the occurrence of haul‐out events. However, in the Baltic Sea, a nontidal, semi‐enclosed shelf sea, the drivers of haul‐out behavior in seals are not well ...
Laura Kuncienė, Ursula Siebert, Žilvinas Kleiva, Dominik Nachtsheim   +3 more
wiley   +1 more source

Seasonal and interannual variability in grey seal diets on Sable Island, eastern Scotian Shelf

NAMMCO Scientific Publications, 2007
We studied seasonal and interannual variability in the diet of grey seals (Halichoerus grypus) using faecal samples collected from Sable Island, Nova Scotia between 1991 and 1998.
W D Bowen, G Harrison
doaj   +1 more source

Can a gray seal (Halichoerus grypus) generalize call classes? [PDF]

, 2015
Past researchers have found that gray seals (Halichoerus grypus) are capable of classifying vocal signals by call type using a trained set, but were unable to generalize to novel exemplars (Shapiro, Slater, & Janik, 2004).
de Freitas, Mafalda, Wu, Gi-Mick, Stansbury, Amanda, Janik, Vincent M.   +3 more
core   +1 more source

Avian influenza overview March–May 2026

EFSA Journal, Volume 24, Issue 7, July 2026.
Abstract Between 28 February and 4 June 2026, 949 highly pathogenic avian influenza (HPAI) A(H5) virus detections were reported in domestic (186) and wild (763) birds in 30 countries in Europe. The downward trend in the number of detections observed at the end of the previous reporting period continued and is expected to persist throughout the summer ...
European Food Safety Authority (EFSA), European Centre for Disease Prevention and Control (ECDC), European Union Reference Laboratory for Avian Influenza (EURL), Hubert Buczkowski, Mariette Ducatez, Alice Fusaro, Jose L Gonzales, Thijs Kuiken, Gražina Mirinavičiūtė, Karl Ståhl, Christoph Staubach, Olov Svartström, Calogero Terregino, Katriina Willgert, Evelyn Alarcón, Lisa Kohnle   +15 more
wiley   +1 more source

Stable Isotope Analysis of New Zealand Fur Seal Vibrissae Shows Deceased Juveniles Were Weaned Early

New Zealand Journal of Marine and Freshwater Research, Volume 60, Issue 2, June 2026.
The New Zealand fur seal/kekeno (Arctocephalus forsteri, NZFS) is a marine predator native to Aotearoa/New Zealand. Little is known about its fine‐scale dispersal around New Zealand in the nonbreeding season. As an alternative to external marking or electronic tracking, stable isotope analysis was trialed to determine the origin of stranded (deceased ...
Diana Galbraith, B. Louise Chilvers
wiley   +1 more source

Estimation of grey seal (Halichoerus grypus) diet composition in the Baltic Sea

NAMMCO Scientific Publications, 2007
We examined the digestive tract contents from 145 grey seals (Halichoerus grypus) collected between 2001 and 2004 in the Baltic Sea. We compensated for biases introduced by erosion of otoliths, both by using additional hard-part structures other than ...
Karl Lundström, Olle Hjerne, Karin Alexandersson, Olle Karlsson   +3 more
doaj   +1 more source

Temporal changes in the dietary niche of sympatric seals provides insight into the role of competition in population declines

Oikos, Volume 2026, Issue 6, June 2026.
Competition theory suggests that interspecific prey competition can result in changes to the dietary niche, but obtaining timeseries of data from sympatric species experiencing temporal variation in competition is challenging. Scotland is an important area for two species of seals, but over the past 20 years, populations of harbour seals Phoca vitulina
Izzy Langley, Philip S. Hammond, Paul M. Thompson, Graham J. Pierce, Lindsay J. Wilson, Ailsa J. Hall, Gordon D. Hastie, Debbie J. F. Russell   +7 more
wiley   +1 more source

Sealworm (Pseudoterranova decipiens) dynamics in Sable Island grey seals (Halichoerus grypus): seasonal fluctuations and other changes in worm infections during the 1980s

NAMMCO Scientific Publications, 2001
The abundance of P. decipiens sampled from the stomachs of 553 grey seals (aged 0-48 years) collected during 14 field trips to Sable Island in 1983 and 1989 did not change significantly between years, even though the seal population has been increasing ...
Wayne T Stobo, G Mark Fowler
doaj   +1 more source

Programmed unmanned aerial vehicles show great potential for monitoring marine megafauna in specific areas of interest

Remote Sensing in Ecology and Conservation, Volume 12, Issue 3, Page 368-387, June 2026.
Targeted conservation measures are contingent on robust knowledge of spatio‐temporal animal distribution in areas of interest. We explore unmanned aerial vehicle (UAV) transect monitoring as a novel method for standardized digital aerial surveys of marine megafauna by investigating the fine‐resolution spatio‐temporal distribution of harbour porpoises ...
Dinah Hartmann, Valdemar Palmqvist, Johanna Stedt   +2 more
wiley   +1 more source