Abstract For effective management of stream salmonids, it is essential to (i) assess the productive potential of a stream in relation to species-specific habitat requirements, and to (ii) identify the key factors underlying any bottleneck periods during the life cycle of a fish. For this purpose, this PhD-thesis focuses on the mechanisms of habitat selection by juvenile salmonids in boreal streams. Habitat preference curves for depth, water velocity, substrate and instream cover for brown trout (Salmo trutta L.) in river Kuusinkijoki, northeastern Finland, indicated that larger trout preferred deeper stream areas than age-0 trout did. In summer, all size-classes of trout preferred small substrates, whereas in winter, areas with cobble-boulder substrates were preferred. Winter presents a bottleneck period for trout in boreal streams; therefore winter habitat curves should be incorporated into habitat-hydraulic models when estimating habitat suitable for riverine trout in areas with severe winter conditions. The preference curves of age-0 trout were validated by correlating age-0 trout density with habitat availability at multiple sites in two boreal rivers where trout densities were monitored in 1988-1995. Substrate preference curve was effective in predicting trout densities among sites, whereas among-year variation in trout densities was best predicted by depth-related preference curves. The responses of age-0 brown trout and grayling (Thymallus thymallus (L.)) to enhancement structures were investigated in artificial stream flumes. For both species a crucial habitat factor was the availability of flow refuges, especially in winter. In another experiment, age-1 trout dominated over age-0 trout when competing for velocity and overhead cover they both found suitable, emphasizing the role of intraspecific interactions in habitat selection by trout. These results suggest that the provision of a broad diversity of microhabitats should be a major goal in rehabilitation programs for fishery purposes. A new method, combining GIS-assisted (Geographical Information System) approach with geostatistical tools, facilitated the detection of fish distribution patterns in a spatially heterogenous stream habitat. The method will likely prove valuable when determining appropriate sampling scale(s) for future studies of fish habitat selection in relation to benthic prey. Unlike Arctic bullhead (Cottus poecilopus, Heckel), trout did not show any aggregation with their benthic prey according to spatially-referenced data on the distribution of lotic fishes and benthic macroinvertebrates within a stream reach.

Current models of hospital-to-home transitions for older adults do not typically include a rehabilitation perspective, which led to the endeavor of this thesis. Chapter 2 (Paper 1) is a scoping review that summarized current literature related to slow-stream rehabilitation (SSR) for older adults. Chapter 3 (Paper 2) was a descriptive prospective cohort study that examined frequency, intensity, type and time (FITT) parameters for cardiovascular and resistance exercises completed by older adult participants in a community-based, SSR, hospital-to-home transition program; and to compare FITT parameters of completed exercises to established guidelines. Chapter 4 (Paper 3) was a qualitative study that examined perspectives of those working in or referring to the community-based, SSR, hospital-to-home transition program to identify factors that act as barriers or facilitators to successful implementation and function of an enhanced, community-based, SSR, hospital-to-home transition program. The scoping review found that SSR programs in single payer healthcare systems improved physical and functional outcomes, decreased hospital readmission and institutionalization for older adults with complex healthcare needs. SSR programs were multidisciplinary, ranged in program and session length, and only took place in institutional settings. The prospective cohort study found that older adults with complex healthcare needs participating in a community-based, SSR, hospital-to-home transition program were able to meet many of the cardiovascular and resistance frequency, intensity, and time (FIT) guideline parameters for community-dwelling older adults. Exercise interventions should be tailored to older adult needs and preferences, at the appropriate FIT to allow for functional gains. The qualitative study found the current program’s services e.g., rehabilitation, education, and nursing care were of benefit. Most of the stated barriers were at a macro or meso level and were out of the study participants’ control, while all the facilitators were at a micro level. Community-based, SSR, hospital-to-home transition programs can serve as a holistic model of care that address identified gaps in the literature. / Dissertation / Doctor of Philosophy (PhD) / Hospital-to-home transition care models do not often include a rehabilitation ‘lens’ which led to this thesis. Chapter 2 was a scoping review of slow-stream rehabilitation (SSR) for older adults; Chapter 3 looked at exercises older adults completed during an SSR hospital-to-home program; and, Chapter 4 studied facilitators and barriers to enhancing a current community-based, SSR, hospital-to-home program. These studies found: 1) SSR programs in healthcare systems like Canada were geared towards older adults with many health problems, only took place in hospital or long-term care settings, and were of benefit; 2) Older adults participating in a SSR hospital-to-home program should exercise at the appropriate intensity, time and frequency to see gains in function; 3) The current program’s services e.g., rehabilitation, education, and nursing care were beneficial, but barriers to enhancing the program were out of the participants’ control. Community-based, SSR, hospital-to-home transition models of care that include rehabilitation are very important for older adults.