A METHOD FOR PREDICTING HARBOR SEAL (PHOCA VITULINA) HAULOUT AND MONITORING LONG-TERM POPULATION TRENDS WITHOUT TELEMETRY

2013 ◽  
Vol 26 (4) ◽  
pp. 605-627 ◽  
Author(s):  
JONATHAN D. COWLES ◽  
SHANDELLE M. HENSON ◽  
JAMES L. HAYWARD ◽  
MATTHEW W. CHACKO
Keyword(s):  
Harbor Seal ◽  
Phoca Vitulina ◽  
Population Trends

scholarly journals Can harbor seals (Phoca vitulina) discriminate familiar conspecific calls after long periods of separation?

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e12431
Author(s):  
Mila Varola ◽  
Laura Verga ◽  
Marlene Gunda Ursel Sroka ◽  
Stella Villanueva ◽  
Isabelle Charrier ◽  
...  
Keyword(s):  
Group Living ◽  
Harbor Seal ◽  
Phoca Vitulina ◽  
Harbor Seals ◽  
Experimental Conditions ◽  
Repeated Interaction ◽  
Significant Difference ◽  
To Come ◽  
Vocal Discrimination

The ability to discriminate between familiar and unfamiliar calls may play a key role in pinnipeds’ communication and survival, as in the case of mother-pup interactions. Vocal discrimination abilities have been suggested to be more developed in pinniped species with the highest selective pressure such as the otariids; yet, in some group-living phocids, such as harbor seals (Phoca vitulina), mothers are also able to recognize their pup’s voice. Conspecifics’ vocal recognition in pups has never been investigated; however, the repeated interaction occurring between pups within the breeding season suggests that long-term vocal discrimination may occur. Here we explored this hypothesis by presenting three rehabilitated seal pups with playbacks of vocalizations from unfamiliar or familiar pups. It is uncommon for seals to come into rehabilitation for a second time in their lifespan, and this study took advantage of these rare cases. A simple visual inspection of the data plots seemed to show more reactions, and of longer duration, in response to familiar as compared to unfamiliar playbacks in two out of three pups. However, statistical analyses revealed no significant difference between the experimental conditions. We also found no significant asymmetry in orientation (left vs. right) towards familiar and unfamiliar sounds. While statistics do not support the hypothesis of an established ability to discriminate familiar vocalizations from unfamiliar ones in harbor seal pups, further investigations with a larger sample size are needed to confirm or refute this hypothesis.

scholarly journals Long-term evidence of noise-induced permanent threshold shift in a harbor seal (Phoca vitulina)

2019 ◽  
Vol 146 (4) ◽  
pp. 2552-2561 ◽  
Author(s):  
Colleen Reichmuth ◽  
Jillian M. Sills ◽  
Jason Mulsow ◽  
Asila Ghoul
Keyword(s):  
Harbor Seal ◽  
Phoca Vitulina ◽  
Threshold Shift

Type III Hiatal Hernia in a Harbor Seal (Phoca vitulina concolor)

2008 ◽  
Vol 34 (2) ◽  
pp. 178-181 ◽  
Author(s):  
Gerard K. Beekman
Keyword(s):  
Hiatal Hernia ◽  
Harbor Seal ◽  
Phoca Vitulina ◽  
Type Iii

scholarly journals Contrasting long-term population trends of beach-nesting shorebirds under shared environmental pressures

2021 ◽  
Vol 260 ◽  
pp. 109178
Author(s):  
Eunbi Kwon ◽  
Samantha Robinson ◽  
Chelsea E. Weithman ◽  
Daniel H. Catlin ◽  
Sarah M. Karpanty ◽  
...  
Keyword(s):  
Population Trends ◽  
Environmental Pressures

Harvest rate of sooty shearwaters (Puffinus griseus) by Rakiura Māori: a potential tool to monitor population trends?

2004 ◽  
Vol 31 (3) ◽  
pp. 319 ◽  
Author(s):  
Jane Catherine Kitson
Keyword(s):  
New Zealand ◽  
Cross Section ◽  
Large Scale ◽  
Population Change ◽  
Population Trends ◽  
Harvest Rate ◽  
General Index ◽  
Careful Screening ◽  
Potential Tool

Sooty shearwaters (tītī, muttonbird, Puffinus griseus) are highly abundant migratory seabirds, which return to breeding colonies in New Zealand. The Rakiura Māori annual chick harvest on islands adjacent to Rakiura (Stewart Island), is one of the last large-scale customary uses of native wildlife in New Zealand. This study aimed to establish whether the rate at which muttonbirders can extract chicks from their breeding burrows indicates population trends of sooty shearwaters. Harvest rates increased slightly with increasing chick densities on Putauhinu Island. Birders' harvest rates vary in their sensitivities to changing chick density. Therefore a monitoring panel requires careful screening to ensure that harvest rates of the birders selected are sensitive to chick density, and represents a cross-section of different islands. Though harvest rates can provide only a general index of population change, it can provide an inexpensive and feasible way to measure population trends. Detecting trends is the first step to assessing the long-term sustainability of the harvest.

Habitat factors related to wild rabbit population trends after the initial impact of rabbit haemorrhagic disease

2006 ◽  
Vol 33 (6) ◽  
pp. 467 ◽  
Author(s):  
Carlos Calvete ◽  
Enrique Pelayo ◽  
Javier Sampietro
Keyword(s):  
Habitat Quality ◽  
Population Trends ◽  
Wild Rabbit ◽  
Pest Species ◽  
Predator Species ◽  
Rabbit Population ◽  
Habitat Factors ◽  
Rabbit Haemorrhagic Disease ◽  
Haemorrhagic Disease

The European wild rabbit (Oryctolagus cuniculus) is an introduced pest species in Australia and New Zealand. Rabbits have a devastating negative impact on agricultural production and biodiversity in these countries, and Rabbit Haemorrhagic Disease (RHD) is currently included in control strategies for rabbit populations. On the other hand, the European wild rabbit is a key native prey species in the Iberian Peninsula. Since the arrival of RHD, however, rabbit populations have undergone dramatic decreases and several predator species at risk of extinction are currently dependent on the rabbit population density. Therefore, from the point of view of biodiversity conservation, evaluating habitat correlates and trends of rabbit populations after the first RHD epizootic is of great interest to improve the long-term control or promotion of wild rabbit populations. We estimated the relationship between habitat factors and long-term population trends as well as the relationships between habitat factors and rabbit abundance 2 and 14 years after the arrival of RHD in several Iberian rabbit populations. We observed that only 26% of surveyed populations seemed to experience an increase in rabbit abundance over the last 12 years and that this increase was higher in the low-rabbit-abundance areas of l992, leading to high rabbit abundance in 2004. Our results suggested that short- and long-term impacts of RHD were related to habitat quality. The initial impact of RHD was higher in more suitable habitats, but increasing long-term population trends were positively related to good habitat quality.

Comparison of the effect of anoxic anoxia and apnea on renal function in the harbor seal (Phoca vitulina, L.)

1956 ◽  
Vol 48 (1) ◽  
pp. 35-49 ◽  
Author(s):  
Preston B. Lowrance ◽  
James F. Nickel ◽  
Cheves McC. Smythe ◽  
Stanley E. Bradley
Keyword(s):  
Renal Function ◽  
Harbor Seal ◽  
Phoca Vitulina

scholarly journals West Nile Flavivirus Polioencephalomyelitis in a Harbor Seal (Phoca vitulina)

2006 ◽  
Vol 43 (1) ◽  
pp. 58-61 ◽  
Author(s):  
F. Del Piero ◽  
D. W. Stremme ◽  
P. L. Habecker ◽  
C. Cantile
Keyword(s):  
Harbor Seal ◽  
Phoca Vitulina ◽  
West Nile

A captive feeding study with the Pacific harbor seal (Phoca vitulina richardii): Implications for scat analysis

2009 ◽  
Vol 25 (2) ◽  
pp. 373-391 ◽  
Author(s):  
Elizabeth M. Phillips ◽  
James T. Harvey
Keyword(s):  
Harbor Seal ◽  
Phoca Vitulina ◽  
Scat Analysis ◽  
Feeding Study ◽  
The Pacific ◽  
Phoca Vitulina Richardii

Isolation and Characterization of Two Parasitic Protozoa from a Pacific Harbor Seal (Phoca Vitulina Richardsi) With Meningoencephalomyelitis

2001 ◽  
Vol 87 (4) ◽  
pp. 816-822 ◽  
Author(s):  
Melissa A. Miller ◽  
Karen Sverlow ◽  
Paul R. Crosbie ◽  
Bradd C. Barr ◽  
Linda J. Lowenstine ◽  
...  
Keyword(s):  
Harbor Seal ◽  
Phoca Vitulina ◽  
Parasitic Protozoa ◽  
Isolation And Characterization ◽  
Phoca Vitulina Richardsi
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