Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 10 of 10 for “"harbor seals"”.
-
Vocal communications among Harbor Seals (Phoca vitulina) on land
Harbor seal (Phoca vitulina) vocalizations have been studied across different regions of their distribution and such studies can be used to understand interactions as well as how different environmental factors may affect them. For the first time, this study investigates the different vocalization …
-
Harbor Seal (Phoca vitulina) Reproductive Advertisement Behavior And The Effects Of Vessel Noise
<p>Harbor seals (Phoca vitulina) are a widely distributed pinniped species that mate underwater. Similar to other aquatically mating pinnipeds, male harbor seals produce vocalizations during the breeding season that function in male-male interactions and possibly as an attractant for females. I …
-
Meteorological and geomorphological influence on harbor seal haul-out distribution behavior using drone imagery
Harbor seals in Kosterhavet National Park face critical challenges during summer months, as two sensitive life stages (pupping and molting) which are vital for the population’s success coincide in time with the increase in tourist activity. This study assessed how topography and meteorological …
-
Lipid studies in breath-hold diving mammals and obese, pre-diabetic mice.
… based on diving ability. Shallower divers (harbor seals, Phoca vitulina) demonstrated significantly higher C16 ceramide, 16:0 sphingomyelin, and dipalmitoylphosphatidylcholine (DPPC) levels compared to deeper divers (Weddell seals, Leptonychotes weddellii). Additionally, in comparing ringed …
-
Interacting populations : hosts and pathogens, prey and predators
… diseases, phocine distemper virus that affects harbor seals in Europe, and the outbreak of HIV/AIDS in Cuba. The second part analyzes the stability of the predator-prey populations that are spatially organized into discrete units or patches. Patches are connected by dispersing individuals that …
-
Interacting populations : hosts and pathogens, prey and predators
… diseases, phocine distemper virus that affects harbor seals in Europe, and the outbreak of HIV/AIDS in Cuba. The second part analyzes the stability of the predator-prey populations that are spatially organized into discrete units or patches. Patches are connected by dispersing individuals that …
-
Feeling out Your Food: A Histological Analysis of the Whisker System in Seals
… important in deep-diving mammals. Pinnipeds (seals, sea lions, and walruses) have highly sensitive whiskers that are used to follow hydrodynamic trails created by their swimming prey. Each pinniped vibrissa is surrounded by a tripartite blood sinus system composed of an upper cavernous sinus …
-
Using Siamese neural networks to identify individual animals
… of approximately 13,000 images of 300 individual harbor seals from 3 locations on the west coast of Scotland. The object detection models are evaluated using the intersection over union (IOU) approach while the SNNs are evaluated on F1 score, the harmonic mean of precision and recall. The proposed …