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.
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Showing 1 to 12 of 12 for “"Sea birds"”.
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Penguins and purse-seiners : competition or co-existence?
… 1982 and August 1983. The distribution at sea and the foraging behaviour of Jackass Penguins were examined by running standard transects with a sail boat in waters close to the birds' breeding islands. The use of a sail boat permitted close observation of foraging penguins with minimal …
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Surface and Subsurface Application of Chemical Dispersants and Associated Ecosystem Impacts
… environmental injury to surface-dwelling sea birds and marine mammals, and facilitating the biodegradation of spilled oil into the water column. </p> <p>For this research, both surface and subsurface application of dispersants were evaluated in terms of oil characteristics and volume, and …
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Effects of Bisphenol-A and Styrene on Fertilization and Development of the Purple Sea Urchin (Strongylocentrotus purpuratus)
… and get ingested by marine mammals, turtles, and sea birds, but they also leach chemicals, such as bisphenol-A (BPA) and styrene into the aquatic environment. While some of these chemicals are known to be toxic, few studies have examined their effects on broadcast spawning marine invertebrates, …
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An Assessment of Sea Turtle, Marine Mammal and Seabird Bycatch in the Wider Caribbean Region
<p>Sea turtles, marine mammals and sea birds are vulnerable to higher mortality rates as a direct function of incidental capture (bycatch) in marine fisheries. Their migratory behavior exposes them to multiple fishing gear types and fishing practices and efforts to understand the rates of …
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The influence of investigator disturbance on aggressive behaviour and breeding success of ring-billed gulls (Larus delawarensis) /
… human intrusion (investigator or other) into seabird colonies has been well documented. In 1990/91, I studied the effects of investigator disturbance on aggressive behaviour and breeding success of individual pairs of ring-billed gulls nesting at two colonies near Port Colborne, Ontario. The …
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The lifestyle of Antarcticavis capelambensis through a study of Polar section modulus
… such as flying, running, soaring, or flapping birds, are not represented. The latest Cretaceous avian fossils that show a foot-propelled diving lifestyle include Vegavis iaai from Antarctica, Polarornis gregorii from Antarctica, Neogaeornis wetzeli from Chile, and a grebe-like tarsometatarsus …
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Powers to conserve or to destroy : a study of coastal factors in marine food resource conservation.
For centuries men have taken food from the sea. With the advent of the industrial revolution came the means with which to harvest and to utilize more fish. Since World War II, marine catches have been increasing as bigger, better equipped boats have been taken further out to sea. Some fishery …
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UNDERSTANDING OF THE VARIABILITY OF PHYTOPLANKTON ECOSYSTEM FUNCTION PROPERTIES: A SYNERGISTIC USE OF REMOTE SENSING AND IN SITU DATA
… of other organisms such as zooplankton, fish, sea birds and marine mammals. The aim of this research was to understand the ecology of phytoplankton and assess which environmental, physical, biological, and spatiotemporal factors influence their distribution and abundance. Using this information …
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Ecology of Audubon's Shearwaters (Puffinus lherminieri) at San Salvador, Bahamas
<p>The Audubon's Shearwater <em>(Pqffinus lherminieri)</em>, nearly pantropical in distribution, remains a poorly studied species. The subspecies <em>P. l. lherminieri </em>is endemic to the West Indies region. An estimated 5,000 pairs inhabit the Caribbean, but there has been a substantial decline …
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Parental care in the common tern (Sterna Nirundo): sexual roles in a monogamous seabird
… hirundo) was documented throughout two breeding seasons at a colony near Port Colborne , Ontario. Thirteen and fourteen pairs of terns were chosen for intensive study in 1982 and 1983, respectively. The delivery of fish by males to their mates ("courtship feeding") occurred prior-to, during, and …
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Breeding parameters of great cormorants (Phalacrocorax carbo carbo) at mixed species colonies on Prince Edward Island, Canada
… 77 and 1978 had clutch-starts in May and June. Seasonal variation in the breeding success of P. dOJibo individuals was examined at Durell Point in 1977. Mean clutch-size, hatching success and fledging success exhibited a seasonal decline. Four- and 5-egg clutches represented the majority (75%) …
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Seasonal variation in the reproductive biology of the ring -billed gull (Larus delawarensis)
… fledging success with date of clutch initiation. Seasonal changes in mean clutch size, hatching success and fledging success also resulted in early clutches, initiated at the peak of clutch starts, producing more chicks per nest (2.34 ± 0.11) than either pre-peak (2.13 ± 0.20) or post-peak (1.82 ± …