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Full-Text Articles in Life Sciences
Food Caching Decisions In Canada Jays (Perisoreus Canadensis), Robert J. Martin
Food Caching Decisions In Canada Jays (Perisoreus Canadensis), Robert J. Martin
Electronic Thesis and Dissertation Repository
Food scarce periods pose serious challenges for birds, particularly when those periods coincide with demanding life history stages such as overwintering. For resident birds in the Northern hemisphere, resource scarcity typically occurs simultaneously with winter conditions. In order to combat these compounded stressors, some species cache food to ensure a reliable supply of resources. Food caching is the storing of food items for subsequent retrieval and consumption after some delay. Canada Jays (Perisoreus canadensis) are year-round residents of the North American boreal forest and some high elevation areas in the United States, and cache food to combat resource …
The Effect Of Shelter Availability On Foraging In Atlantic Salmon (Salmo Salar), Christian A. Therrien
The Effect Of Shelter Availability On Foraging In Atlantic Salmon (Salmo Salar), Christian A. Therrien
Electronic Thesis and Dissertation Repository
Shelter is an environmental feature that provides protection from danger and its use is an important anti-predator behavior for juvenile Atlantic salmon (Salmo salar). However, how shelter availability influences the foraging of these fish in the wild is not well documented. I predicted that juvenile Atlantic salmon would alter their foraging behavior in a low shelter environment and that this effect would differ between individuals from two populations that are targeted for reintroduction into Lake Ontario. I measured the foraging activity of juvenile Atlantic salmon from the two populations while they were held in pens in a Lake …
Spatial Memory In Black-Capped Chickadees: Studies Of Adult Hippocampal Neurogenesis And Win-Shift/Win-Stay Spatial Search, Nicole Ann Guitar
Spatial Memory In Black-Capped Chickadees: Studies Of Adult Hippocampal Neurogenesis And Win-Shift/Win-Stay Spatial Search, Nicole Ann Guitar
Electronic Thesis and Dissertation Repository
Two cognitive adaptations were studied in Black-capped chickadees through tests of adult hippocampal neurogenesis and Win-shift/Win-stay spatial search. Neurogenesis has been proposed to aid memory, therefore it was hypothesized that birds with decreased neurogenesis would perform poorer than controls in hippocampal-dependent spatial working and reference memory tasks followed by a reversal. Subjects with decreased neurogenesis, caused by the neurotoxin MAM, reversed slower than controls, suggesting that neurogenesis may contribute to differentiating similar memories, although this effect was nonsignificant. Win-shift/Win-stay foraging behavior is an adaptation to the replenishing and depleting nature of food. Since chickadees forage on food that depletes quickly …