A5014072541- Marine animal studies overview
- Physiological and biochemical adaptations
- Underwater Acoustics Research
- Parasite Biology and Host Interactions
- Aerospace Engineering and Energy Systems
- Fatty Acid Research and Health
- Mercury impact and mitigation studies
- Arctic and Antarctic ice dynamics
- Thyroid Disorders and Treatments
- Toxic Organic Pollutants Impact
- Reproductive biology and impacts on aquatic species
- Cephalopods and Marine Biology
- Cardiovascular and Diving-Related Complications
- Underwater Vehicles and Communication Systems
- Neonatal Respiratory Health Research
- Visual perception and processing mechanisms
- Marine Bivalve and Aquaculture Studies
- High Altitude and Hypoxia
- COVID-19 and Mental Health
- Vaccine Coverage and Hesitancy
- Ichthyology and Marine Biology
- Animal Vocal Communication and Behavior
- Viral Infections and Outbreaks Research
- Marine and fisheries research
- Meat and Animal Product Quality
Busitema University
2023-2025
Mbale Hospital
2023
Mbarara University of Science and Technology
2023
Cardiovascular Research Foundation
2021
University of Rwanda
2017
University of Guelph
1981-1994
Ontario Veterinary College
1981
Alaska Department of Fish and Game
1974
Hospital for Sick Children
1961
University of Toronto
1961
ABSTRACT The propulsive motions of swimming harp seals (Phoca groenlandica Erxleben) and ringed hispida Schreber) were studied by filming individuals in a flume. swam at velocities ranging from 0·6 to 1·42 ms−1. Locomotion was accomplished with alternate lateral sweeps the hind flippers generated flexions axial body conjuction flexion flippers. frequency cycle increased linearly velocity, maximum angle attack flipper decreased, but amplitude remained constant. kinematics morphology this...
Measurements were made of the relation between body temperature, respiration, diving pattern, and water temperature using three adult harp seals (Phoca groenlandica). Core ventilation, gas exchange, pattern not affected by ranging from 1.8 to 28.2 °C. The basal metabolic rate in this study was significantly different than that predicted for terrestrial mammals equivalent size. Expired heat loss convective accounted 16% independent temperature. remaining 84% lost flippers which less 14%...
Metabolic replacement rates (Ra) for glucose and free fatty acids (FFA) were determined during rest, exercise, diving conditions in the gray seal using bolus injections of radiotracers. In exercise experiments swam at a metabolic rate elevated twofold over resting Ra FFA while similar to values found terrestrial mammals other marine mammal species. During periods turnover increased slightly changes variable. However, energetic demands could not be met by increase or even if both completely...
Assimilation efficiency of energy in juvenile harp seals was 92.5–95.0% gross intake when fed Atlantic herring and 72.2% shrimp. Faecal losses increased directly with intake. Metabolizable (ME) ranged from 85.5 to 88.7% for a diet herring. Urinary apparent digestible nitrogen urinary were not affected significantly by feeding frequency. Urine excretion indicated that causes diuresis, associated energy, nitrogen, ash excretion. A significant interaction found rate weight change between...
Harp seals are born on the drifting ice of North Atlantic Ocean during arctic winter when temperatures -20 degrees C, occasionally in combination with wind 10 m/s, might prevail for days. At birth pups lack subcutaneous blubber and wet infantile fur has a conductance value 30.0 W . m-2 C-1, as compared only 2.0 C-1 dry. While still immediately after nevertheless able to retain body core temperature by shivering. This activity leads reduction muscle fat glycogen stores. Nonshivering...
Three types of fibre, dark (type 1), light 2) and intermediate, were distinguished in the caval sphincter muscle diaphragm harp seal (Pagophilus groenlandicus) using histochemical electron-microscopic techniques. The fibre contained large peripheral aggregations mitochondria, numerous lipid droplets dense aggregates glycogen granules. same features observed too. In low oxidative enzyme activity high lipase other skeletal muscles previous studies, it is postulated that these mitochondrial...
In recent years, Ugandan universities have faced a rising incidence of mental health issues among students, with prevalence rates disorders reaching up to 60% undergraduates. These challenges significantly impact both academic performance and social interactions. This study aimed investigate the coping mechanisms students at Busitema University. We conducted 42 key informant interviews diagnosed disorders, as determined by Mini International Neuropsychiatric Interview. Interviews were guided...
Assimilation efficiency of gross energy (±SD) in juvenile and adult grey seals fed Atlantic herring was 92.6 ± 2.1%. Metabolizable (ME) 82.7 4.8% intake. Faecal losses increased directly with intake urinary apparent digestible nitrogen Maintenance requirements were estimated at 4215 kcal (1 cal = 4.1868 J) ME daily for both seals, equivalent to food intakes 3.0–3.2 1.5% body weight adults, respectively.
A free-field underwater audiogram from 0.76 to 100 kHz was obtained for Pagophilus groenlandicus. Areas of increased sensitivity occurred at 2 and 22.9 kHz. The lowest threshold −32.9 db/μbar 15.0 Above 64 the increases a rate 40 db/octave. similar that Phoca vitulina. effects ambient noise on are discussed.
A free-field air audiogram from 1 to 32 kHz was obtained for a Pagophilus groenlandicus trained respond pure tone signals. The lowest threshold at 4 level of 29 db//0.0002 dynes/cm 2 . generally flat. critical ratios and were 10%. lumen the external auditory meatus is probably acoustically blocked. outer (or) middle ear structures their acoustic impedance mismatch with are believed responsible comparatively irregular slightly insensitive hearing seal in air.
Minimum audible field, underwater audiograms from 1 to 90 kHz were obtained for two ringed seals (Pusa hispida). The exhibited a uniform sensitivity, within ± 7 dB, in the frequency range 45 kHz. Above threshold increased at rate of 60 dB per octave. lowest was −32 relative μbar (68 re μPa) 16 similar those other phocid so far studied.
The critical ratios of two ringed seals were estimated by determining pure-tone thresholds (yes–no, forced choice) in the presence various noise bands. Data obtaind from both pooled. (using spectrum levels −30 and −40 dB re 1 μbar) 30±5.4, 32±3.8, 34±2.8, 35±4.5 at 4, 8, 16, 32 kHz, repectively. These values are consistent with findings other mammalian species. In open ocean, meteorological man-made noises below 100 kHz may mask underwater hearing marine mammals. As there is less than 10-dB...
The physical properties, including erythrocyte number, leucocyte number and differential ratio, pH, pCO 2 , pO haemoglobin level, haematocrit, are recorded for the harp seal (Pagophilus groenlandicus). Reference is made to various aspects of seal's biology, molt, migration, parasitism.
From 1969 to 1971, 78 harp seals (Pagophilus groenlandicus), ranging in age from newborn 18 years were obtained the Gulf of St. Lawrence and Newfoundland Labrador coasts (Front). A further 12 captured died (in captivity) after being held for various periods time.Total DDT metabolites (Σ DDT) blubber wild beaters bedlamers > 2 ppm, Front < ppm. levels increased 8.7 ppm as animals matured, females levelled off at 6.5 when breeding was reached. Dieldrin only 5% those Σ DDT, did not...
Behavioral determinations of harp seal spectral sensitivity, under light- and dark-adapted conditions, indicated the presence a Purkinje shift. Maximum photopic sensitivity occurred near 550 nm. Scotopic peaked in region 500–525 A large increase relative approaching 8 log units at 525 nm, accompanied dark adaptation. This confirms anatomical suggestions that possesses excellent visual sensitivity. Increased to green wavelengths may indicate adaptation particular underwater environment.