Little interannual variability in gray seal (Halichoerus grypus) trophic niches during pregnancy despite variable environmental conditions

2021 ◽  
Author(s):  
KM Hernandez ◽  
WB Puryear ◽  
JA Runstadler ◽  
MJ Polito
Keyword(s):  
Interannual Variability ◽  
Environmental Conditions ◽  
Halichoerus Grypus ◽  
Gray Seal ◽  
Trophic Niches

scholarly journals Onset and duration of gray seal (Halichoerus grypus) molt in the Wadden Sea, and the role of environmental conditions

2017 ◽  
Vol 33 (3) ◽  
pp. 830-846 ◽  
Author(s):  
Jessica Schop ◽  
Geert Aarts ◽  
Roger Kirkwood ◽  
Jenny S. M. Cremer ◽  
Sophie M. J. M. Brasseur
Keyword(s):  
Environmental Conditions ◽  
Wadden Sea ◽  
Halichoerus Grypus ◽  
Gray Seal

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 Life cycle bioenergetics of the gray seal (Halichoerus grypus) in the Baltic Sea: Population response to environmental stress

2020 ◽  
Vol 145 ◽  
pp. 106145 ◽  
Author(s):  
Willian T.A.F. Silva ◽  
Karin C. Harding ◽  
Gonçalo M. Marques ◽  
Britt Marie Bäcklin ◽  
Christian Sonne ◽  
...  
Keyword(s):  
Life Cycle ◽  
Environmental Stress ◽  
Baltic Sea ◽  
Halichoerus Grypus ◽  
The Baltic Sea ◽  
Population Response ◽  
Gray Seal ◽  
The Baltic

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

Seasonal variability and individual consistency in gray seal (Halichoerus grypus) isotopic niches

2019 ◽  
Vol 97 (11) ◽  
pp. 1071-1077
Author(s):  
K.M. Hernandez ◽  
A.L. Bogomolni ◽  
J.H. Moxley ◽  
G.T. Waring ◽  
R.A. DiGiovanni ◽  
...  
Keyword(s):  
United States ◽  
Seasonal Variability ◽  
Foraging Ecology ◽  
Population Level ◽  
The United States ◽  
Halichoerus Grypus ◽  
Dietary Specialization ◽  
Gray Seal ◽  
Individual Consistency ◽  
Gray Seals

Although it is often assumed that individuals in generalist populations are equivalent, recent research indicates that individual dietary specialization can be common in marine predators. Gray seals (Halichoerus grypus (Fabricius, 1791)) were considered locally extinct in United States waters by 1958 but have since recolonized the region. Although considered generalists, less is known about gray seal foraging ecology in the United States. To address this, we used carbon and nitrogen stable isotope analyses to investigate the foraging niches of adult gray seals in Massachusetts, USA. We examined skin, fur, and blood components to investigate seasonal variability and individual consistency in foraging niches, and serially sampled vibrissae to quantify the degree of individual foraging specialization in this population. Our results suggest that seals shift from coastal foraging habitats before molt to offshore habitats after molt, with a coincident shift from higher to lower trophic-level prey. Adult gray seals also exhibited individual consistency in foraging niches independent of population-level shifts and reflect a generalist population composed of individual foraging specialists. These findings serve as a baseline for subsequent research on gray seals in United States waters that could help to determine the mechanisms which promote individual specialization in this population.

METAL SENSITIVITY OF MARINE MAMMALS: A CASE STUDY OF A GRAY SEAL (HALICHOERUS GRYPUS)

2006 ◽  
Vol 22 (4) ◽  
pp. 985-996 ◽  
Author(s):  
A. Kakuschke ◽  
E. Valentine-Thon ◽  
S. Fonfara ◽  
S. Griesel ◽  
U. Siebert ◽  
...  
Keyword(s):  
Marine Mammals ◽  
Halichoerus Grypus ◽  
Gray Seal ◽  
Metal Sensitivity

Respiratory properties of blood of the gray seal,Halichoerus grypus

1982 ◽  
Vol 149 (1) ◽  
pp. 49-56 ◽  
Author(s):  
George N. Lapennas ◽  
Robert Blake Reeves
Keyword(s):  
Halichoerus Grypus ◽  
Gray Seal

IMAGING DIAGNOSIS-ULTRASONOGRAPHIC AND CT FINDINGS IN A GRAY SEAL (HALICHOERUS GRYPUS) WITH HEPATIC CIRRHOSIS, PYELONEPHRITIS, AND NEPHROLITHIASIS

2013 ◽  
Vol 54 (5) ◽  
pp. 555-559
Author(s):  
Marie de Swarte ◽  
Jill Bryan ◽  
Micaela Zarelli ◽  
Vihelmiina Huuskonen ◽  
Wilfried Schneeweiss ◽  
...  
Keyword(s):  
Hepatic Cirrhosis ◽  
Halichoerus Grypus ◽  
Imaging Diagnosis ◽  
Gray Seal ◽  
Ct Findings

Metabarcoding Fecal DNA Reveals Extent of Halichoerus grypus (Gray Seal) Foraging on Invertebrates and Incidence of Parasite Exposure

2020 ◽  
Vol 27 (4) ◽  
Author(s):  
Christina McCosker ◽  
Kelly Flanders ◽  
Kathryn Ono ◽  
Michelle Dufault ◽  
Dominique Mellone ◽  
...  
Keyword(s):  
Halichoerus Grypus ◽  
Fecal Dna ◽  
Gray Seal ◽  
Parasite Exposure

scholarly journals Climatology, Storm Morphologies, and Environments of Tornadoes in the British Isles: 1980–2012

2015 ◽  
Vol 143 (6) ◽  
pp. 2224-2240 ◽  
Author(s):  
Kelsey J. Mulder ◽  
David M. Schultz
Keyword(s):  
Northern Ireland ◽  
Interannual Variability ◽  
Geographic Distribution ◽  
Environmental Conditions ◽  
High Shear ◽  
British Isles ◽  
Diurnal Cycles ◽  
Isle Of Man ◽  
Time Period ◽  
Tornado Outbreaks

Abstract A climatology is developed for tornadoes during 1980–2012 in the British Isles, defined in this article as England, Scotland, Wales, Northern Ireland, Republic of Ireland, Channel Islands, and the Isle of Man. The climatology includes parent storm type, interannual variability, annual and diurnal cycles, intensities, occurrence of outbreaks (defined as three or more tornadoes in the same day), geographic distribution, and environmental conditions derived from proximity soundings of tornadoes. Tornado reports are from the Tornado and Storm Research Organization (TORRO). Over the 33 years, there were a mean of 34.3 tornadoes and 19.5 tornado days (number of days in which at least one tornado occurred) annually. Tornadoes and tornado outbreaks were most commonly produced from linear storms, defined as radar signatures at least 75 km long and approximately 3 times as long as wide. Most (78%) tornadoes occurred in England. The probability of a tornado within 10 km of a point was highest in the south, southeast, and west of England. On average, there were 2.5 tornado outbreaks every year. Where intensity was known, 95% of tornadoes were classified as F0 or F1 with the remainder classified as F2. There were no tornadoes rated F3 or greater during this time period. Tornadoes occurred throughout the year with a maximum from May through October. Finally, tornadoes tended to occur in low-CAPE, high-shear environments. Tornadoes in the British Isles were difficult to predict using only sounding-derived parameters because there were no clear thresholds between null, tornadic, outbreak, and significant tornado cases.

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