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Diet And Trophic Relationships Of Fishes From The Nearshore Of The Bay Of Quinte And Kingston Basin, Lake Ontario, Jaclyn Marie Brush
Diet And Trophic Relationships Of Fishes From The Nearshore Of The Bay Of Quinte And Kingston Basin, Lake Ontario, Jaclyn Marie Brush
Electronic Theses and Dissertations
Few studies have assessed spatial and seasonal variation in diet and trophic position of fishes within large lakes. Two areas of north-eastern Lake Ontario - the Bay of Quinte and the Kingston Basin – provide contrasts in temperature, nutrients and depth while supporting similar littoral fish communities and therefore provide an excellent system to address this information gap. In Chapter 2, diet and trophic position of the Round Goby (Neogobius melanostomus) varied seasonally and spatially between these two habitats. Stable isotopes indicated that stomach contents over-estimated the contribution of mollusc-prey to the diet of Round Goby and under-estimated …
Invasion Risk Associated With Invertebrates And Their Dormant Stages In Ships Entering Canadian Ports, Elizabeta Briski
Invasion Risk Associated With Invertebrates And Their Dormant Stages In Ships Entering Canadian Ports, Elizabeta Briski
Electronic Theses and Dissertations
The shipping industry has been a leading mechanism for introducing nonindigenous species (NIS) into aquatic ecosystems. Two different ballast water regulations, mid-ocean exchange (MOE) and saltwater flushing, were implemented as management practices to reduce the likelihood of new biological invasions in the Pacific, Great Lakes and Atlantic regions of Canada. There has, however, been no formal assessment of the efficacy of these regulations on invertebrates and their dormant eggs transported in the ballast sediment of ships, and current invasion risk posed by these taxa to different regions of Canada. To determine the potential risk of invasion associated with this vector …
The Vocal Behaviour And Reproductive Strategies Of A Neotropical Duetting Wren, Sarah Brynn Douglas
The Vocal Behaviour And Reproductive Strategies Of A Neotropical Duetting Wren, Sarah Brynn Douglas
Electronic Theses and Dissertations
In tropical bird species where both males and females sing, breeding partners may coordinate their songs in vocal duets. This thesis explores relationships between vocal duetting behaviour and reproductive activities in neotropical Rufous-and-white Wrens (Thryothorus rufalbus). In Chapter 2 I describe the previously unknown genetic mating strategy of this species. Extra-pair paternity accounted for two percent of nestlings in three of 51 broods. In Chapter 3 I test four hypotheses for duet function: the reproductive synchrony, paternity guarding, signalling quality, and signalling commitment hypotheses. I found little support for these hypotheses, although female duet output appears to signal …
Water Absorption Of Wood Plastic Composite And Biopolymer Reinforced With Switchgrass-Fiber Biocomposite Materials, Ganesh Muralidhar Venukadasula
Water Absorption Of Wood Plastic Composite And Biopolymer Reinforced With Switchgrass-Fiber Biocomposite Materials, Ganesh Muralidhar Venukadasula
Electronic Theses and Dissertations
Biocomposites have become widely used materials these days. Due to their light weight and ability to be tailored for specific end uses they have gained a considerable ground in the high performance applications, such as aerospace and automobile industry. However, the use of polymers that can be recycled with carbon and other niche fibers renders the composite non-recyclable. The objective of this present research work was to study the resistance of the Biocomposite and Wood Plastic Composite materials to water. A Biocomposite made up of biopolymer reinforced with switchgrass fibers and a WPC prepared from High density polyethylene reinforced with …