scholarly journals Spatial distribution and habitat preference of harbour seals (Phoca vitulina) in the Dutch North Sea

2016 ◽  
Author(s):  
Geert Aarts ◽  
◽  
Jenny Cremer ◽  
Roger Kirkwood ◽  
Jan Tjalling van der Wal ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
North Sea ◽  
Habitat Preference ◽  
Phoca Vitulina ◽  
Harbour Seals

Fatal Interspecies Mating Attempts of a Grey Seal (Halichoerus grypus) with Harbour Seals (Phoca vitulina) on the German North Sea Coast

2020 ◽  
Vol 174 ◽  
pp. 166
Author(s):  
K. Hülskötter ◽  
S. Rohner ◽  
S. Groß ◽  
J. Lakemeyer ◽  
M. Fähndrich ◽  
...  
Keyword(s):  
North Sea ◽  
Phoca Vitulina ◽  
Halichoerus Grypus ◽  
Grey Seal ◽  
Harbour Seals ◽  
Sea Coast ◽  
North Sea Coast

Histopathological findings in harbour seals (Phoca vitulina) found dead on the german north sea coast

1990 ◽  
Vol 102 (3) ◽  
pp. 299-309 ◽  
Author(s):  
U SCHUMACHER ◽  
H HORNY ◽  
G HEIDEMANN ◽  
W SCHULTZ ◽  
U WELSCH
Keyword(s):  
North Sea ◽  
Phoca Vitulina ◽  
Histopathological Findings ◽  
Harbour Seals ◽  
Sea Coast ◽  
North Sea Coast

The importance of the North Sea for winter dispersal of harbour seals Phoca vitulina from the Wadden Sea

1997 ◽  
Vol 81 (1-2) ◽  
pp. 97-102 ◽  
Author(s):  
Mardik F. Leopold ◽  
Bert van der Werf ◽  
Edith H. Ries ◽  
Peter J.H. Reijnders
Keyword(s):  
North Sea ◽  
Wadden Sea ◽  
Phoca Vitulina ◽  
The North ◽  
Harbour Seals ◽  
The North Sea

scholarly journals Relationships between in vitro lymphoproliferative responses and levels of contaminants in blood of free-ranging adult harbour seals (Phoca vitulina) from the North Sea

2013 ◽  
Vol 142-143 ◽  
pp. 210-220 ◽  
Author(s):  
Aurélie Dupont ◽  
Ursula Siebert ◽  
Adrian Covaci ◽  
Liesbeth Weijs ◽  
Gauthier Eppe ◽  
...  
Keyword(s):  
North Sea ◽  
Phoca Vitulina ◽  
The North ◽  
Harbour Seals ◽  
The North Sea ◽  
Free Ranging

scholarly journals Predicting recurrent PDV epizootics in European harbour seals (Phoca vitulina)

2010 ◽  
Vol 8 ◽  
pp. 275 ◽  
Author(s):  
Tero Härkönen ◽  
Karin C Harding
Keyword(s):  
North Sea ◽  
Herd Immunity ◽  
Phoca Vitulina ◽  
High Rate ◽  
The North ◽  
Rate Of Spread ◽  
Phocine Distemper Virus ◽  
Harbour Seals ◽  
The North Sea ◽  
Sea Area

Phocine Distemper Virus (PDV) caused mass mortality in European harbour seals (Phoca vitulina) in 1988 and in 2002. Both epizootics likely originated from refugia in Arctic seals, where data indicate PDV hops among populations and species. The metapopulation structure of host populations is suggested to be the reason why PDV is preserved among Arctic seals, since the high rate of spread of PDV would require much larger panmictic populations to maintain an infection. The pattern of sudden outbreaks of PDVis also seen in grey seals (Halichoerus grypus), the only to date identified species that could act as a vector between Arctic and North Sea seal populations. Harbour seal populations along mainland Europe were below critical herd immunity levels by 3-5 years after the events, and thus vulnerable for new outbreaks, but historical data and the 14 years between the 2 epizootics suggest that harbour seals in the North Sea area are only rarely exposed to the infective agent. The risk for new outbreaks of the seal plague in North Sea harbour seals is likely linked to the dynamics of the disease in Arctic seal species as well asvector species.

Species and size differences in the digestion of otoliths and beaks: implications for estimates of pinniped diet composition

1997 ◽  
Vol 54 (1) ◽  
pp. 105-119 ◽  
Author(s):  
D J Tollit ◽  
M J Steward ◽  
P M Thompson ◽  
G J Pierce ◽  
M B Santos ◽  
...  
Keyword(s):  
Confidence Intervals ◽  
North Sea ◽  
Diet Composition ◽  
Prey Size ◽  
Phoca Vitulina ◽  
Correction Factors ◽  
Fish Size ◽  
Harbour Seals ◽  
Specific Correction ◽  
Length Reduction

We examined the digestion of hard remains of between one and four different size ranges of nine key North Sea prey taxa fed to seven captive harbour seals (Phoca vitulina). Percentage length reduction (mean 27.5%) and recovery rates (mean 42%) of experimental otoliths varied between species and were positively correlated to fish size and otolith robustness (mass/length). Mean length reduction of egested otoliths increased systematically with increasing size of ingested whiting and sandeel otoliths (p < 0.001), indicating that the size of larger fish may be underestimated. Intraspecific variation in otolith digestion was high (CV = 0.48-1.30), and to control for the artificial conditions of a captive study, external morphological features of otoliths were used to grade the degree of digestion and provide grade-specific correction factors. Bootstrap simulations were used to estimate 95% confidence intervals around correction factors and when partitioned indicated that calculation errors were in general less important than resampling errors. The application of species-, size-, and grade-specific correction factors progressively improved reconstructed estimates of prey biomass fed. As a consequence, estimates of prey size and diet composition require otoliths from faeces to be graded and more complex correction factors applied.

The influence of underwater data transmission sounds on the displacement behaviour of captive harbour seals (Phoca vitulina)

2006 ◽  
Vol 61 (1) ◽  
pp. 19-39 ◽  
Author(s):  
Ronald A. Kastelein ◽  
Sander van der Heul ◽  
Willem C. Verboom ◽  
Rob J.V. Triesscheijn ◽  
Nancy V. Jennings
Keyword(s):  
Data Transmission ◽  
Phoca Vitulina ◽  
Harbour Seals
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