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Island Syndrome and Stress Physiology of Mice in the Genus Peromyscus

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Creator (cre): Stewart, Nathan, Thesis advisor (ths): Burness, Gary, Degree committee member (dgc): Bowman, Jeff, Degree committee member (dgc): Schaefer, James, Degree granting institution (dgg): Trent University
Abstract:

Biological differences between island and mainland conspecifics have been well studied, but few studies have addressed differences in stress physiology. Stressors, such as predation and competition for resources, cause the release of glucocorticoids (GCs). Characteristics of island wildlife, called "island syndrome", are attributed to low levels of predators and competitors. I tested the hypothesis that island syndrome includes differences in GC levels between island and mainland rodents using two approaches; first, using white-footed mice (Peromyscus leucopus) from a near-shore archipelago (Thousand Islands, Ontario) and the nearby mainland; second, using study-skins of deer mice (Peromyscus maniculatus) from two archipelagos offshore of Vancouver Island, British Columbia. White-footed mice in the near-shore archipelago did not show characteristics of island syndrome, or changes in GC levels (feces and hair); however deer mice from both archipelagos in British Columbia were heavier and had lower hair GCs for their size than Vancouver Island mice.

Author Keywords: Glucocorticoids, Island rule, Island syndrome, Peromyscus, Stress physiology

2017

Fostering sustainable development through cross-sector collaboration in university innovation initiatives: A Case Study of the Trent Research & Innovation Park

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Names:
Creator (cre): Campos Navarrete, Marisol, Thesis advisor (ths): Zohar, Asaf, Degree committee member (dgc): Newhouse, David R, Degree committee member (dgc): Knight, John, Degree granting institution (dgg): Trent University
Abstract:

This research explores cross-sector collaboration in universities' innovation initiatives. To understand the current roles of the higher education sector and the influences shaping innovation initiatives through cross-sector collaborative projects, this study is focused on a case study of the Trent University Research & Innovation Park (TRIP) project. The following three central issues emerged from the thematic analysis performed through the case study: the roles played by universities in creating a context for successful innovation ventures; the construct of culture as a dominant driver in such ventures; and the implications of collective learning in cross-sector collaborations as an enabler of successful innovation projects.

Based on the findings of this study, it is argued that the opportunities and potential of Universities' cross-sectoral innovation projects rely on three crucial factors: the local culture, the individuals involved, and their specialized skills such as those involved in the 'High Ductility' skill set.

Author Keywords: Collective learning, Cross-sectoral collaboration, Higher Education sector, Innovation models, Organizational culture, Sustainable Development

2017

Predicting the Pursuit of Post-Secondary Education: Role of Trait Emotional Intelligence in a Longitudinal Study

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Creator (cre): Dave, Hiten, Thesis advisor (ths): Parker, James D. A., Degree committee member (dgc): Keefer, Kateryna V., Degree granting institution (dgg): Trent University
Abstract:

Trait Emotional Intelligence (EI) includes competencies and dispositions related to identifying, understanding, using and managing emotions. Higher trait EI has been implicated in post-secondary success, and better career-related decision-making. However, there is no evidence for whether it predicts the pursuit of post-secondary education (PSE) in emerging adulthood. This study investigated the role of trait EI in PSE pursuit using a large, nationally-representative sample of Canadian young adults who participated in the National Longitudinal Survey for Children and Youth (NLSCY). Participants in this dataset reported on their PSE status at three biennial waves (age 20-21, 22-23, and 24-25), and completed a four-factor self-report scale for trait EI (Emotional Quotient Inventory: Mini) at ages 20-21 and 24-25. Higher trait EI subscale scores were significantly associated with greater likelihood of PSE participation both concurrently, and at 2- and 4-year follow-ups. Overall, these associations were larger for men than women. Trait EI scores also showed moderate levels of temporal stability over four years, including full configural and at least partial metric invariance between time points. This suggests that the measure stays conceptually consistent over the four years of emerging adulthood, and that trait EI is a relatively malleable attribute, susceptible to change with interventions during this age period.

Author Keywords: Emerging Adulthood, Longitudinal, Post-Secondary Pursuit, Trait Emotional Intelligence

2017

Temperature effects on the routine metabolic rates of brook trout (Salvelinus fontinalis) eggs, alevin and fry: implications for climate change

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Creator (cre): Cook, Catharine Jean, Thesis advisor (ths): Wilson, Chris, Thesis advisor (ths): Burness, Gary, Degree committee member (dgc): Ridgway, Mark, Degree granting institution (dgg): Trent University
Abstract:

Early developmental stages of cold-adapted ectotherms such as brook trout

(Salvelinus fontinalis) are at risk of mortality with increasing water temperatures because

of their sensitivity to changes in their environment. I studied the mass and routine

metabolic rate (RMR) of wild-origin brook trout eggs, alevin and young fry reared at

normal (5°C) and elevated (9°C) temperatures for the duration of the study or at

mismatched temperatures. This setup determined if preconditioning acclimation for one

temperature benefits or hinders the organism later in life. Three levels of biological

organization (ancestry, population, family) were studied using Akaike's Information

Criterion (AIC) to identify models that best accounted for variation in the data. Family,

mass and temperature were most important in predicting body mass and mass-adjusted

RMR, although population and ancestral-level differences were also detected at some life

stages. Strong variation in body mass and mass-adjusted RMR among families may

indicate adaptive potential within brook trout populations to respond to increases in water

temperature with climate change.

Author Keywords: Acclimation, AIC, Brook trout (Salvelinus fontinalis), Environmental matching, Routine metabolic rate, Temperature

2017

Elders And Indigenous Healing in The Correctional Service Of Canada: A Story of Relational Dissonance, Sacred Doughnuts, And Drive-Thru Expectations

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Names:
Creator (cre): Quantick, Robin, Thesis advisor (ths): Berrill, Deborah P., Degree committee member (dgc): Furgal, Chris, Degree committee member (dgc): Bell, Nicole, Degree granting institution (dgg): Trent University
Abstract:

In our communities, we are continually challenged to reflect on effective responses to the people and events that put us at risk. This study is an examination of two distinctly different world-view responses: the colonial, dominant culture and the Indigenous world-view. The retributive understanding of the dominant culture applies assumptions about the nature of the world that are vested in colonial, paternal, and punitive processes aimed to extract compliance as a means of deterrence. Conversely, the consensual precepts of Indigenous world-view are rooted in community-based practices that require a process of collaboration and cooperation to create integrated relationships that glean responsibility.

This study brings light to bear on the ongoing relational dissonance that exists between the following: the disproportionate representation of men and women of Aboriginal descent held under federal warrant in Canada; the legislated mandate contained within the Canadian Corrections and Conditional Release Act that places successful community reintegration as a primary objective for the Correctional Service of Canada (CSC); and the role, place, and function of Elders who work in CSC reception centres, healing programs, and Pathways Initiatives.

This study explores the variables, assumptions, and differing world-views that contribute to the disproportionate representation of incarcerated adults of Aboriginal descent and the challenges that impede successful community reintegration. In order to effectively examine and make sense of the relational dissonance that exists between correctional theory and institutional practice, the research is driven by a central question: What is the role, place, and function of Elders in the delivery of Indigenous healing programs within Canadian federal prisons?

The outcome of this work reveals practices of decolonizing justice and healing that can move assumptions and challenge paternal understanding. It is an approach that has the capacity to peel away relational dissonance, thus allowing space for public policy that sustains consensual understandings of community.

Key Words: Indigenous, settler colonial, dominant culture, retributive justice, restorative justice, indigenous justice, Elder, healing, healing program, disproportionate representation, successful community reintegration, relational dissonance.

Author Keywords: Elder, healing program, indigenous justice, relational dissonance, retributive justice, successful community reintegration

2017

Social discrimination by female polar bears (Ursus maritimus) when accompanied by dependent offspring during the ice-free season in southern and western Hudson Bay and James Bay

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Creator (cre): Mondoux, Courtney C., Thesis advisor (ths): Wilson, Paul J, Thesis advisor (ths): Obbard, Martyn E, Degree committee member (dgc): Petersen, Stephen D, Degree granting institution (dgg): Trent University
Abstract:

Polar bears are generally described as solitary, but features of their life cycles and

habitats regularly necessitate interaction. Effective conspecific assessment, including accurate

recognition and discrimination, likely confers benefits, especially to females accompanied by

dependent young. Individuals in the Southern (SH) and Western (WH) Hudson Bay

subpopulations are ideal for studying polar bear social behaviours because of the prolonged

high densities of the ice-free season. First, I looked outside family groups to model their fine

scale sociospatial organization on land. Capture locations were more likely to correspond to

family groups when there were fewer neighbouring bears, when a greater proportion of

neighbours were female, and when the focal individual and neighbours were significantly

related. Second, I looked within the family group to assess offspring recognition. Of 288

offspring in 207 family groups captured in the SH subpopulation from 1999 through 2013, only

one case of adoption (of a singleton) was observed.

Author Keywords: Adoption, Kin Recognition, Logistic Regression, Maternity Analysis, Social Discrimination, Sociospatial

2017

Enhancing forensic entomology applications: identification and ecology

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Creator (cre): Langer, Sarah Victoria Louise, Thesis advisor (ths): Beresford, David V, Thesis advisor (ths): Kyle, Christopher J, Degree committee member (dgc): Freeland, Joanna R, Degree granting institution (dgg): Trent University
Abstract:

The purpose of this thesis is to enhance forensic entomology applications through identifications and ecological research with samples collected in collaboration with the OPP and RCMP across Canada. For this, we focus on blow flies (Diptera: Calliphoridae) and present data collected from 2011-2013 from different terrestrial habitats to analyze morphology and species composition. Specifically, these data were used to: 1) enhance and simplify morphological identifications of two commonly caught forensically relevant species; Phormia regina and Protophormia terraenovae, using their frons-width to head-width ratio as an additional identifying feature where we found distinct measurements between species, and 2) to assess habitat specificity for urban and rural landscapes, and the scale of influence on species composition when comparing urban and rural habitats across all locations surveyed where we found an effect of urban habitat on blow fly species composition. These data help refine current forensic entomology applications by adding to the growing knowledge of distinguishing morphological features, and our understanding of habitat use by Canada's blow fly species which may be used by other researchers or forensic practitioners.

Author Keywords: Calliphoridae, Ecology, Forensic Entomology, Forensic Science, Morphology, Urban

2017

Fate and Effects of Silver Nanoparticle Addition in a Lake Ecosystem

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Creator (cre): Rearick, Daniel C, Thesis advisor (ths): Xenopoulos, Marguerite A, Degree committee member (dgc): Hickie, Brendan E, Degree committee member (dgc): Hintelmann, Holger, Degree granting institution (dgg): Trent University
Abstract:

The potential release of nanoparticles into aquatic environments is raising global concerns. As antimicrobials, silver nanoparticles (AgNPs) are among the most prominent form in use. Despite this, their fate, long-term toxicity, and ecological relevance have yet to be investigated largely under natural settings with seasonality and environmental complexity. To better understand the environmental significance, we released AgNPs into Lake 222 at the Experimental Lakes Area over two years. AgNPs remained suspended in the water column and were detected throughout the lake and in the lower food web. Total Ag concentrations ranged from below 0.07 to 18.9 μg L-1 in lake water, and were highly dynamic seasonally both in the epilimnion and hypolimnion depending on the physical, chemical and biological conditions of the lake. Approximately 60% of the measured Ag mass in October was present in the sediment in 2014 and 50% in 2015 demonstrating relatively high sedimentation and removal from the water column. During winter months, Ag was largely absent in the water column under the ice. After ice melt and before summer stratification, Ag concentrations increased in the lake suggesting AgNPs may not be tightly bound to the sediment and are able re-enter the water column during spring mixing events. Despite temporal variation, total Ag was highly synchronous across spatial locations for both years, indicating rapid dispersal upon lake entry. When investigating AgNP sizes using spICPMS, size distributions were similar across spatial locations, with the 40-60 nm size class constituting approximately 60% of all particles identified. Large aggregates (>100 nm) and dissolved Ag were infrequently detected within the lake. Ag accumulated in the lower food web ranging from 0.27-16.82 μg Ag mg C-1 in the bacterioplankton and 0.17-6.45 μg Ag mg C-1 in algae (particulate fraction). Partial least squares models revealed the highest predictors of Ag accumulation were dissolved nutrients including DOC, TDN, TDP in bacterioplankton. Major predictors for particulate Ag included temperature, dissolved oxygen, and sampling date. The diversity of predictors among biological compartments emphasizes the importance of understanding the role of environmental complexity within the lower food web. Despite Ag accumulation we did not detect strong negative effects on the lake food web. An increase in particulate and bacterioplankton chlorophyll-a occurred after addition in contrast to reference lakes, which may indicate a hormetic response to low dose AgNP concentrations. Our findings provide the first whole-lake perspective regarding Ag fate and toxicity, suggesting small scale experiments may overestimate environmental

responses.

Author Keywords: Ecotoxicity, Fate, Lower food web, Silver Nanoparticles, Whole-lake addition

2017

Jail Time: Effects of Attachment, Gender, and Contact on the Associations Between Parental Incarceration, Offspring Symptoms and Delinquency

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Creator (cre): Reid, Jessica Lynn, Thesis advisor (ths): Scharfe, Elaine, Degree committee member (dgc): Navara, Geoff, Degree granting institution (dgg): Trent University
Abstract:

Children of incarcerated parents are an understudied at-risk population. However, this thesis was designed to advance our understanding of the effects of parental incarceration and factors that may influence the impact. Using quantitative methods, possible moderating roles of gender, number of incarcerated parents, and contact frequency on the associations between attachment representations and problem behaviours were investigated in two samples. Results revealed that the number of incarcerated parents and contact frequency with incarcerated parents moderated the associations between attachment and externalizing behaviours. Furthermore, after controlling for several factors (e.g., gender, number of incarcerated parents, and contact) higher scores on secure parental attachment representations were consistently negatively associated with internalizing symptoms and externalizing behaviours. The discussion of findings highlight the utility of attachment theory in conceptualizing the impact of parental incarceration and the importance of fostering attachment security to promote positive mental health and behavioural outcomes for children of incarcerated parents.

Author Keywords: attachment, internalizing symptoms, parental incarceration, problem behaviours

2017

Linking Inuit and Scientific Knowledge and Observations to Better Understand Arctic Char (Salvelinus alpinus (L.)) Community Monitoring

Type:
Names:
Creator (cre): Knopp, Jennie A., Thesis advisor (ths): Furgal, Chris M, Degree committee member (dgc): Whillans, Tom, Degree committee member (dgc): Reist, James D, Degree granting institution (dgg): Trent University
Abstract:

Arctic Char (Salvelinus alpinus (L.)) have been, and remain, an important

subsistence resource for the Inuvialuit, the Inuit of the western Canadian Arctic. The effects

of climate variability and change (CVC) in this region have been noticeably increasing over

the past three decades. There are concerns as to how CVC will affect Arctic Char and the

Inuvialuit who rely on this resource as they will have to adapt to changes in the fishery.

Community-based monitoring, is an important tool for managing Arctic Char. Therefore,

my dissertation focused on the central question of: Which community-based monitoring

factors and parameters would provide the information needed by local resources

users and decision-makers to make informed choices for managing Arctic Char

populations in light of CVC?

This question is investigated through an exploratory research approach and a mixed

method research design, using both scientific and social science methods, and quantitative

(scientific ecological knowledge and observation) and qualitative (Inuvialuit knowledge

and observation) information. It is formatted as three journal manuscripts, an introduction,

and an integrative discussion. The first manuscript examines potential habitat parameters

for monitoring landlocked Arctic Char condition in three lakes on Banks Island in the

Inuvialuit Settlement Region. The second manuscript examines potential local

environmental parameters for monitoring landlocked Arctic Char growth in the same three

lakes. The third manuscript investigates aspects of Arctic Char community-based

monitoring programs (CBMP) in the Canadian North that have led to the sustained

collection of useful data for management of the resource.

This dissertation makes contributions to the field of research by demonstrating the

utility of a mixed methods approach. The results demonstrate similarities and differences

in char growth and condition within and among Capron, Kuptan and Middle lakes on Banks

Island. This supports both lake-specific and regional climate-driven changes, meaning both

lake habitat and local environmental monitoring parameters should be used in char CBMP.

The investigation of char CBMP across northern Canada demonstrates that an adaptive

monitoring approach is important for subsistence fisheries, as changing lifestyles and

environmental changes impacting a fishery can have direct effects on the successful

operation of char CBMP.

Author Keywords: Arctic Char, community-based monitoring, environment, Inuit Knowledge, mixed methods, Traditional Knowledge

2017