Article
Environmental Sciences
Brianne K. Soulen, Lauren M. Divine, Barney J. Venables, Aaron P. Roberts
Summary: This study analyzed the concentrations of persistent organic pollutants (POPs) in the blubber of northern fur seals and evaluated the associated gene expression changes. The results showed a negative correlation between contaminant concentrations, lipid content in the blubber, and gene expression changes related to blubber metabolism. These findings highlight the potential impacts of contaminants on the health of northern fur seals.
MARINE ENVIRONMENTAL RESEARCH
(2022)
Article
Zoology
Peter A. Permyakov, Sergey D. Ryazanov, Alexey M. Trukhin, Vyacheslav B. Lobanov, Hyun Woo Kim, Seok-Gwan Choi
Summary: Three Northern fur seals were tagged with satellite tags on Tyuleniy Island in the Sea of Okhotsk in October 2018. Their migration patterns and foraging grounds were tracked for several months. The adult females migrated in the Japan/East Sea, entering through the La Perouse Strait. The juvenile male crossed the Sea of Okhotsk and reached the coastal areas of Hokkaido Island, Japan.
ZOOLOGICAL STUDIES
(2023)
Article
Veterinary Sciences
Kaoru Kohyama, Masashi Kiyota, Yasuo Inoshima
Summary: Through analyzing blood samples from captive northern fur seals, the study found seasonal fluctuation patterns in 14 hematological parameters, with nine parameters showing significant seasonal differences using GLMM analysis. These results enhance our understanding of the seasonal patterns of hematological characteristics in the northern fur seal, which can help improve the health care of protected or captive northern fur seals.
JOURNAL OF VETERINARY MEDICAL SCIENCE
(2021)
Article
Veterinary Sciences
Kaoru Kohyama, Yasuo Inoshima, Masashi Kiyota
Summary: The study found that male Northern fur seals reached puberty at ages 3 and 4 when there were slight increases in serum testosterone levels, followed by considerable increases during breeding seasons indicating sexual maturity. Immature female seals maintained low levels of serum progesterone, but after puberty, showed increases in August and decreases afterwards. Immature males steadily increased body mass, reaching puberty when exceeding 20 kg, with seasonal weight fluctuations thereafter.
JOURNAL OF VETERINARY MEDICAL SCIENCE
(2022)
Article
Biodiversity Conservation
Mayuko Otsuki, Takanori Horimoto, Motoki Kobayashi, Yuka Morita, Shigeho Ijiri, Yoko Mitani
Summary: The study examined testosterone levels in hair samples from 57 male northern fur seals off Hokkaido and found that testosterone levels increased towards the breeding season, with the highest levels in May. Seals with spermatids were sampled between April and June, even with low testosterone levels in April. Seals with spermatids in May showed the highest testosterone levels.
CONSERVATION PHYSIOLOGY
(2021)
Article
Zoology
Yukino Hirakawa, Takanori Horimoto, Ippei Suzuki, Yoko Mitani
Summary: The study proposes using morphometrics of genital organs of northern fur seals to determine sexual maturity. Testicular mass was found to accurately predict stages of spermatogenesis. Measurement of baculum was suggested as an indicator of sexual maturity.
Article
Fisheries
Yu Kanaji, Hiroto Murase, Hiroshi Nagashima, Kenji Minami, Ryuichi Matsukura, Takashi Setou, Hiroko Sasaki, Shiroh Yonezaki
Summary: Standard line-transect modeling was used to estimate the abundance of northern fur seals in their wintering and feeding ground off the Pacific coast of northern Japan. The results indicated that the seals were one of the most abundant marine mammals in the region. This study provided the first attempt to estimate absolute abundance in the area.
Article
Veterinary Sciences
Rachel Conway, Colleen Duncan, Robert A. Foster, Gilbert J. Kersh, Stephen Raverty, Tom Gelatt, Chad Frank
Summary: This study characterizes the severity and extent of histologic lesions caused by C. burnetii in northern fur seal placentas. The results suggest that C. burnettii and associated pathologic changes are multifocal and variable in placentas from these presumably live-born pups.
JOURNAL OF WILDLIFE DISEASES
(2022)
Article
Marine & Freshwater Biology
Elizabeth A. McHuron, David A. S. Rosen, Julie Carpenter, Patricia Leonard, Gayle Sirpenski, Jeremy T. Sterling
Summary: Estimates of prey and energy consumption are crucial for effective management and conservation of northern fur seals. In this study, data collected from zoological institutions revealed that body mass, food intake, and energy intake of fur seals varied throughout the year and with age, sex, and reproduction. Adult males exhibited rapid increases in body mass prior to the breeding season, and there were also seasonal differences in energy conversion efficiency. Understanding these patterns is important for assessing prey consumption in northern fur seals.
MARINE MAMMAL SCIENCE
(2022)
Article
Veterinary Sciences
Rhea L. Storlund, David A. S. Rosen, Marco Margiocco, Martin Haulena, Andrew W. Trites
Summary: Pinniped hearts have been studied through dissection, but in vivo measurements of cardiac structure, function, and electrophysiology are lacking. Electrocardiograms and echocardiograms were performed on Steller sea lions, northern fur seals, and a walrus under anesthesia. The results showed similarities with other pinniped species but also significant differences, with reduced cardiac contractility in anesthetized Steller sea lions compared to awake terrestrial mammals.
JOURNAL OF ZOO AND WILDLIFE MEDICINE
(2021)
Article
Engineering, Marine
Jeffrey W. Short, Harold J. Geiger, Lowell W. Fritz, Jonathan J. Warrenchuk
Summary: The population of the Pribilof northern fur seal has declined by around 70% since the 1970s in the eastern Bering Sea. There is evidence suggesting an inverse relationship between pollock fishery catches and first-year survival of fur seals, possibly due to lactating female fur seals depending on pollock schools near the Pribilof Islands for nutrition.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Immunology
Valerie Johnson, A. Russell Moore, Rachel Conway, Tonya Zeppelin, Tom Gelatt, Colleen Duncan
Summary: The decline of northern fur seals on the Pribilof Islands is likely due to a combination of factors, including environmental changes and exposure to pathogens and pollutants. Evaluation of inflammatory markers, antioxidant levels, and hematologic and biochemical profiles can provide valuable information about the health of the population.
VETERINARY IMMUNOLOGY AND IMMUNOPATHOLOGY
(2021)
Review
Marine & Freshwater Biology
Valerie Cortes, Kelly Patyk, Claire Simeone, Valerie Johnson, Johanna Vega, Kate Savage, Colleen Duncan
Summary: This scoping review synthesized and reviewed 50 years of literature on the health of northern fur seals. The review found that infectious disease reports were common, but there was a lack of connection between disease research and individual or population health outcomes. This highlights the need for a more holistic and interdisciplinary approach to studying the health of northern fur seals.
OCEANS-SWITZERLAND
(2022)
Review
Parasitology
Tetiana A. Kuzmina, Yuriy Kuzmin, Igor Dzeverin, Olga I. Lisitsyna, Terry R. Spraker, Eleonora M. Korol, Roman Kuchta
Summary: The population of northern fur seals is declining rapidly, with a diverse range of parasites found in their gastrointestinal tracts. Studies from different years show small but statistically significant changes in the structure of their helminth communities.
PARASITOLOGY RESEARCH
(2021)
Article
Marine & Freshwater Biology
O. L. Zhdanova, A. E. Kuzin, E. Ya. Frisman
Summary: This paper analyzes the dynamics of reproductive characteristics of Northern fur seal females on Tyuleniy Island based on data obtained by Japan and the USSR. The study compares the reproductive characteristics of fur seal females from Tyuleniy Island with those from the Pribilof Islands, where different harvesting strategies were implemented. Despite the differences in strategies, a similar trend was observed in the reproductive characteristics of females from both locations during the period of intensive hunting, possibly due to a shortage of young bulls and subadult males caused by intensive hunting of males on Tyuleniy Island.
RUSSIAN JOURNAL OF MARINE BIOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Florin Iordache, Mariana Ionita, Liviu Ioan Mitrea, Cornelia Fafaneata, Aneta Pop
CURRENT PHARMACEUTICAL BIOTECHNOLOGY
(2015)
Article
Parasitology
M. F. Sommer, R. Beck, M. Ionita, J. Stefanovska, A. Vasic, N. Zdravkovic, D. Hamel, S. Rehbein, M. Knaus, I. L. Mitrea, E. Shukullari, Z. Kirkova, D. Rapti, B. Capari, C. Silaghi
PARASITOLOGY RESEARCH
(2015)
Article
Parasitology
Isabela Madalina Dragoi Nicorescu, Mariana Ionita, Laurentiu Ciupescu, Cristian Vasile Buzatu, Rodica Tanasuica, Ioan Liviu Mitrea
VETERINARY PARASITOLOGY
(2015)
Article
Public, Environmental & Occupational Health
Mariana Ionita, Ioan Liviu Mitrea, Angela Monica Ionica, Sorin Morariu, Andrei Daniel Mihalca
VECTOR-BORNE AND ZOONOTIC DISEASES
(2016)
Article
Infectious Diseases
Mariana Ionita, Cornelia Silaghi, Ioan Liviu Mitrea, Sophie Edouard, Philippe Parola, Kurt Pfister
TICKS AND TICK-BORNE DISEASES
(2016)
Article
Parasitology
Mariana Ionita, Isabela Madalina Nicorescu, Kurt Pfister, Ioan Liviu Mitrea
PARASITOLOGY RESEARCH
(2018)
Article
Parasitology
Ioan Liviu Mitrea, Violeta Enachescu, Mariana Ionita
JOURNAL OF PARASITOLOGY
(2013)
Article
Parasitology
Mariana Ionita, Ioan Liviu Mitrea, Kurt Pfister, Dietmar Hamel, Catalin Marius Buzatu, Cornelia Silaghi
PARASITOLOGY RESEARCH
(2012)
Article
Parasitology
Mariana Ionita, Ioan Liviu Mitrea, Kurt Pfister, Dietmar Hamel, Cornelia Silaghi
VETERINARY PARASITOLOGY
(2013)
Article
Parasitology
Ioan Liviu Mitrea, Mariana Ionita, Irina Ioana Costin, Gabriel Predoi, Eugeniu Avram, Laura Rinaldi, Maria Paola Maurelli, Giuseppe Cringoli, Claudio Genchi
VETERINARY PARASITOLOGY
(2014)
Article
Parasitology
Georgiana Deak, Nina Gillis-Germitsch, Angela Monica Ionica, Angela Mara, Ioana Raluca Pastrav, Cristina Daniela Cazan, Mariana Ionita, Ioan Liviu Mitrea, Cristian Raileanu, Diana Barburas, Maria Nedisan, Razvan Oachis, Vasile Cozma, Roland Schaper, Manuela Schnyder, Andrei Daniel Mihalca
PARASITES & VECTORS
(2019)
Article
Parasitology
Laurentiu Leica, Ioan Liviu Mitrea, Mariana Ionita
JOURNAL OF PARASITOLOGY
(2019)
Article
Microbiology
Andreea Monica Bogdan, Mariana Ionita, Ioan Liviu Mitrea
Summary: This study investigated the seroprevalence of selected tick-borne pathogens among Romanian horses, revealing natural exposure of these horses to zoonotic tick-borne pathogens and the presence of antibodies against Anaplasma phagocytophilum, Borrelia burgdorferi sensu lato, and Ehrlichia spp. The findings highlight the importance of further studies to better understand the epidemiology of equine tick-borne diseases in Romania.
Article
Parasitology
D. Pana, A. Radulescu, I. L. Mitrea, M. Ionita
Article
Parasitology
Violeta Enachescu, Mariana Ionita, Ioan Liviu Mitrea
ACTA PARASITOLOGICA
(2014)