Direct evidence for gray seal (Halichoerus grypus) predation and scavenging on harbor porpoises (Phocoena phocoena)

2014 ◽  
Vol 30 (4) ◽  
pp. 1542-1548 ◽  
Author(s):  
Thibaut Bouveroux ◽  
Jeremy J. Kiszka ◽  
Michael R. Heithaus ◽  
Thierry Jauniaux ◽  
Sylvain Pezeril
Keyword(s):  
Direct Evidence ◽  
Halichoerus Grypus ◽  
Phocoena Phocoena ◽  
Gray Seal ◽  
Harbor Porpoises

Effect of Pile-Driving Playback Sound Level on Fish-Catching Efficiency in Harbor Porpoises (Phocoena phocoena)

2019 ◽  
Vol 45 (4) ◽  
pp. 398-410 ◽  
Author(s):  
Ronald A. Kastelein ◽  
Léonie A. E. Huijser ◽  
Suzanne Cornelisse ◽  
Lean Helder-Hoek ◽  
Nancy Jennings ◽  
...  
Keyword(s):  
Sound Level ◽  
Pile Driving ◽  
Phocoena Phocoena ◽  
Harbor Porpoises

Behavioral Responses of Harbor Porpoises (Phocoena phocoena) to U.S. Navy 53C Sonar Signals in Noise

2019 ◽  
Vol 45 (4) ◽  
pp. 359-366
Author(s):  
Ronald A. Kastelein ◽  
Michael A. Ainslie ◽  
Ruby van Kester
Keyword(s):  
Behavioral Responses ◽  
Phocoena Phocoena ◽  
Harbor Porpoises

Short Note: Predation of Harbour Porpoises (Phocoena phocoena) by Grey Seals (Halichoerus grypus) in Wales

2015 ◽  
Vol 41 (2) ◽  
pp. 188-191 ◽  
Author(s):  
Thomas Stringell ◽  
Dave Hill ◽  
Dafydd Rees ◽  
Ffion Rees ◽  
Padrig Rees ◽  
...  
Keyword(s):  
Short Note ◽  
Halichoerus Grypus ◽  
Phocoena Phocoena

scholarly journals Mycotic Infections in Free-Ranging Harbor Porpoises (Phocoena phocoena)

2020 ◽  
Vol 7 ◽  
Author(s):  
Athanasia Kapetanou ◽  
Lonneke L. IJsseldijk ◽  
Dorien S. Willems ◽  
Els M. Broens ◽  
Eligius Everaarts ◽  
...  
Keyword(s):  
Phocoena Phocoena ◽  
Free Ranging ◽  
Harbor Porpoises ◽  
Mycotic Infections

scholarly journals Phthalate metabolites in harbor porpoises (Phocoena phocoena) from Norwegian coastal waters

2020 ◽  
Vol 137 ◽  
pp. 105525 ◽  
Author(s):  
May Britt Rian ◽  
Kristine Vike-Jonas ◽  
Susana Villa Gonzalez ◽  
Tomasz Maciej Ciesielski ◽  
Vishwesh Venkatraman ◽  
...  
Keyword(s):  
Coastal Waters ◽  
Phocoena Phocoena ◽  
Phthalate Metabolites ◽  
Harbor Porpoises

Harbor porpoise (Phocoena phocoena) recovery in the inland waters of Washington: estimates of density and abundance from aerial surveys, 2013–2015

2016 ◽  
Vol 94 (7) ◽  
pp. 505-515 ◽  
Author(s):  
Thomas A. Jefferson ◽  
Mari A. Smultea ◽  
Sarah S. Courbis ◽  
Gregory S. Campbell
Keyword(s):  
Puget Sound ◽  
Distance Sampling ◽  
Line Transect ◽  
Inland Waters ◽  
San Juan ◽  
Phocoena Phocoena ◽  
Harbor Porpoise ◽  
San Juan Islands ◽  
Juan De Fuca ◽  
Harbor Porpoises

The harbor porpoise (Phocoena phocoena (L., 1758)) used to be common in Puget Sound, Washington, but virtually disappeared from these waters by the 1970s. We conducted systematic aerial line-transect surveys (17 237 km total effort) for harbor porpoises, with the goal of estimating density and abundance in the inland waters of Washington State. Surveys in Puget Sound occurred throughout the year from 2013 to 2015, and in the Strait of Juan de Fuca and the San Juan Islands (and some adjacent Canadian waters) in April 2015. We used a high-wing, twin-engine Partenavia airplane and four observers (one on each side of the plane, one looking through a belly port, and one recording data). A total of 1063 harbor porpoise groups were sighted. Density and abundance were estimated using conventional distance sampling methods. Analyses were limited to 447 harbor porpoise groups observed during 5708 km of effort during good sighting conditions suitable for line-transect analysis. Harbor porpoises occurred in all regions of the study area, with highest densities around the San Juan Islands and in northern Puget Sound. Overall, estimated abundance for the Washington Inland Waters stock was 11 233 porpoises (CV = 37%, 95% CI = 9 616 – 13 120). This project clearly demonstrated that harbor porpoises have reoccupied waters of Puget Sound and are present there in all seasons. However, the specific reasons for their initial decline and subsequent recovery remain uncertain.

scholarly journals Bite Injuries of Grey Seals (Halichoerus grypus) on Harbour Porpoises (Phocoena phocoena)

PLoS ONE ◽  
2014 ◽  
Vol 9 (12) ◽  
pp. e108993 ◽  
Author(s):  
Thierry Jauniaux ◽  
Mutien-Marie Garigliany ◽  
Pauline Loos ◽  
Jean-Luc Bourgain ◽  
Thibaut Bouveroux ◽  
...  
Keyword(s):  
Halichoerus Grypus ◽  
Phocoena Phocoena ◽  
Bite Injuries

scholarly journals Dynamics of the formation of a differentiation track conditioned reflex to sound stimuli of a certain duration in the gray seal Halichoerus grypus Fabricius, 1791 by the methods of operant conditioning.

2021 ◽  
Vol 12 (3-2021) ◽  
pp. 7-13
Author(s):  
A.F. Berdnik ◽  
Keyword(s):  
Reaction Time ◽  
Operant Conditioning ◽  
Conditioned Reflex ◽  
Audio Signal ◽  
Halichoerus Grypus ◽  
Audio Signals ◽  
Gray Seal ◽  
And Behavior ◽  
Sound Duration

In the course of the study, a 15-year-old female gray seal was trained to press a button after displaying an audio signal for 5 seconds and ignore similar audio signals of longer or shorter duration. The conducted research has demonstrated the ability of the experimental seal to reliably differentiate sound signals with a difference in sound duration of 3 seconds. Changes in the reaction time and behavior of the seal during the demonstration of sound stimuli with distinguishable and indistinguishable time ranges are described.

scholarly journals Comparing the performance of C-PODs and SoundTrap/PAMGUARD in detecting the acoustic activity of harbor porpoises (Phocoena phocoena)

2016 ◽  
Author(s):  
Joanna Sarnocinska ◽  
Jakob Tougaard ◽  
Mark Johnson ◽  
Peter T. Madsen ◽  
Magnus Wahlberg
Keyword(s):  
Phocoena Phocoena ◽  
Acoustic Activity ◽  
Harbor Porpoises
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