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Benthic macroinvertebrates, pumpkinseed sunfish (𝘓𝘦𝘱𝘰𝘮𝘪𝘴 𝘨𝘪𝘣𝘣𝘰𝘴𝘶𝘴) and brown bullhead (𝘈𝘮𝘦𝘳𝘪𝘶𝘴 𝘯𝘦𝘣𝘶𝘭𝘰𝘴𝘶𝘴) were sampled at three sites in western Hamilton Harbour and Cootes Paradise in early June 1995. The diversity, abundance, similarity and variability of the substrate benthic community and the gut contents of the fish were analyzed. The gut contents of both species of fish reflected the diversity, similarity and variability of the site at which they were caught. Mean gut fullness, analysized using prey abundance and volume, shows no significant difference between sites, suggesting that the fish were eating similar amounts of prey at all three sites. Both pumpkinseed sunfish and brown bullhead fed selectively on certain size classes and benthic taxa, including several taxonomic groups previously unreported for these species. Differences in benthic community structure at the three sites and the resultant differences in fish diet have important implications for the remediation of Hamilton Harbour. As water quality improves and the macrophyte cover increases, benthic diversity and abundance will increase. These improvements will increase the area of the littoral zone and the quality of the rearing and feeding environments for the recovering warmwater fisheries in Hamilton Harbour. / Thesis / Master of Science (MS)

Development of Internet weight loss programs may be a viable method for reducing the public health burden of obesity. The purpose of this study was to evaluate the efficacy of the Internet for delivery of weight control programs. Participants (10M, 81F; age=40.9; BMI=29.0) were randomly assigned to receive Internet Behavior Therapy (IBT, n=46) or an Internet Education program (IEd, n=45). Participants in IEd were given an initial face-to-face meeting and directed to weight loss related websites they could use to develop their own weight loss program, but were given no further help to do this. Participants in IBT received this meeting, access to the same website resources plus additional behavioral procedures, all delivered via Internet and e-mail, including a sequence of weekly behavioral weight loss lessons; prompting for submission of weekly self-monitoring diaries; personalized feedback; and an on-line bulletin board for social support. Attrition (15%) was not different between conditions. Weight losses measured at 12 weeks were significantly greater for IBT (-9.0 lbs ± 5.9lbs) than IEd (-2.98 lbs ± 5.7lbs; p<.001). Furthermore, significantly more participants in IBT lost ≥ 1 pound per week (32% IBT vs. 13% ISH; p<.05). Participants in IBT also logged into the website significantly more often than those in IEd (19.7 ± 10.3 times vs. 9.6 ± 10.5 times; p<.001). Simply providing access to weight loss related websites produced minimal weight loss. However, an Internet program incorporating behavioral procedures appears a promising new weight loss approach. / Ph. D.

2 pp. / Recommendations for diet, foods and activity to reduce risk for developing some cancers.