Journal articles on the topic 'Urban ecology (Biology) – Ontario – Toronto'
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1
Larson, Doug W., Uta Matthes, Peter E. Kelly, Jeremy Lundholm, and John A. Gerrath. "The Urban Cliff Hypothesis and its relevance to ekistics." Ekistics and The New Habitat 71, no. 424-426 (June 1, 2004): 76–82. http://dx.doi.org/10.53910/26531313-e200471424-426228.
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The Cliff Ecology Research Group (CERG), Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada, has been in existence since 1985 when its members began working on the ecology of the Niagara Escarpment (fig. 1). In 1988 they discovered a stand of ancient trees growing on the cliffs and in 1989 they discovered that in fact the escarpment cliffs support the oldest and least disturbed forest ecosystem in Canada. Individual living trees older than 1,300 years are still present and the forest appears to be in steady state. CERG's work on the ancient trees led to the idea that cliffs serve as refuges for many species including ancient humans. That observation led to the development of the Urban Cliff Hypothesis that is described in this paper and was presented at the international symposion on " The Natural City, " Toronto, 23-25 June, 2004, sponsored by the University of Toronto's Division of the Environment, Institute for Environmental Studies, and the World Society for Ekistics, and also led to the recent book entitled The Urban Cliff Revolution.
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Peat, Tyler B., Lee F. G. Gutowsky, Susan E. Doka, Jonathan D. Midwood, Nicholas W. R. Lapointe, Bogdan Hlevca, Mathew G. Wells, Rick Portiss, and Steven J. Cooke. "Comparative thermal biology and depth distribution of largemouth bass (Micropterus salmoides) and northern pike (Esox lucius) in an urban harbour of the Laurentian Great Lakes." Canadian Journal of Zoology 94, no. 11 (November 2016): 767–76. http://dx.doi.org/10.1139/cjz-2016-0053.
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Understanding how individuals are distributed in space and time, as well as how they interact with dynamic environmental conditions, represent fundamental knowledge gaps for many fish species. Using acoustic telemetry tags, we monitored the temperatures and depths used by northern pike (Esox lucius L., 1758) and largemouth bass (Micropterus salmoides (Lacepède, 1802)) in Toronto Harbour (Lake Ontario). Northern pike and largemouth bass had similar thermal experiences throughout the year, except during summer, when northern pike were observed in cooler waters than largemouth bass. Both species used different depths throughout the year, with northern pike occupying deeper depths. Statistical modelling indicated that depth usage was influenced by all variables (season, species, and body size) and interactions between them, whereas thermal preferences were influenced by the main effects and interactions between species:season and species : body size. Both species were observed at temperatures warmer than those in the vicinity of nearby telemetry stations, but as station temperatures exceeded 20 °C, northern pike moved into cooler water, indicating active thermoregulation. These data will be useful for refining our understanding of the spatial ecology of fish and for informing fisheries and habitat management in this and other urban harbours of the Laurentian Great Lakes.
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Helferty, Natalie. ""Localization": A means to reduce negative transportation impacts in the "natural city"." Ekistics and The New Habitat 71, no. 427-429 (December 1, 2004): 233–35. http://dx.doi.org/10.53910/26531313-e200471427-429193.
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The author runs "Natural Heritage Consulting" in Richmond Hill, Ontario, Canada. She is a former Adjunct Professor at Ryerson University having taught Applied Ecology as a joint program between the School of Occupational and Public Health and the School of Urban and Regional Planning. She has provided environmental policy input on government initiatives such as the formation of the Greenbelt around the City of Toronto in her capacity as a member of the Province of Ontario's Greenbelt Task Force. The text that follows is a revised and edited version of a paper presented by the author at the Natural City conference - "Success Stories" - organized by the Centre for Environment, University of Toronto from 31 May to 2 June, 2006.
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Jardine, Claire M., Nicol Janecko, Mike Allan, Patrick Boerlin, Gabhan Chalmers, Gosia Kozak, Scott A. McEwen, and Richard J. Reid-Smith. "Antimicrobial Resistance in Escherichia coli Isolates from Raccoons (Procyon lotor) in Southern Ontario, Canada." Applied and Environmental Microbiology 78, no. 11 (March 23, 2012): 3873–79. http://dx.doi.org/10.1128/aem.00705-12.
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ABSTRACTWe conducted a cross-sectional study to determine the prevalence of antimicrobial resistance (AMR) in fecalEscherichia coliisolates from raccoons (Procyon lotor) living in Ontario, Canada. From June to October 2007, we trapped raccoons in three areas: one primarily urban site around Niagara, one primarily rural site north of Guelph, and one at the Toronto Zoo. In addition, we conducted a longitudinal study at the Toronto Zoo site to investigate the temporal dynamics of fecalE. coliand AMR in raccoons. Reduced susceptibility to ≥1 antimicrobial agent was detected inE. coliisolates from 19% of 16 raccoons at the urban site, 17% of 29 raccoons from the rural site, and 42% of 130 samples collected from 59 raccoons at the zoo site. Raccoons from the zoo site were significantly more likely to shedE. coliwith reduced susceptibility to ≥1 antimicrobial agent than animals from the rural site (odds ratio [OR], 3.41; 95% confidence interval [CI], 1.17 to 12.09;P= 0.02). Resistance to expanded-spectrum cephalosporins (and the associatedblaCMY-2gene) was detected in two animals from the zoo site and one animal from the rural site. Serotyping and pulsed-field gel electrophoresis analysis show that raccoons on the zoo grounds harbor a diverse assemblage ofE. coli, with rapid bacterial turnover within individuals over time. Our study indicates that raccoons may shed resistant bacteria of public health significance and that raccoons have the potential to disseminate these bacteria throughout their environment.
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McMullin, Richard Troy, Katherine Drotos, David Ireland, and Hanna Dorval. "Diversity and conservation status of lichens and allied fungi in the Greater Toronto Area: results from four years of the Ontario BioBlitz." Canadian Field-Naturalist 132, no. 4 (July 11, 2019): 394–406. http://dx.doi.org/10.22621/cfn.v132i4.1997.
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Bioblitzes are typically 24-hour biological surveys of a defined region carried out by taxonomic specialists, citizen scientists, and the general public. The largest in Canada is the Ontario BioBlitz, an annual event held in the Greater Toronto Area (GTA). Between 2013 and 2016, we examined the feasibility of including lichens and allied fungi in the Ontario BioBlitz. These taxa are often overlooked, understudied, and taxonomically difficult. We completed a bioblitz in each of the four major watersheds in the GTA and recorded 138 species in 72 genera which, combined with all previous collections, totals 180 species in 88 genera in the area. Thirteen of the species we collected are provincially ranked as S1 (critically imperilled), S2 (imperilled), or S3 (vulnerable). We collected Lecanora carpinea for the first time in Ontario. Our results provide a baseline list of GTA lichens that can be used for monitoring. This is one of the first detailed lichen surveys of a major North American urban area and it demonstrates that rapid bioblitz surveys are proficient in capturing lichen diversity despite their inconspicuous nature and the advanced microscopy and chemical analyses required for their identification.
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Kjeldsen-Kragh Keller, Julie, and Cecil Konijnendijk. "Short Communication: A Comparative Analysis of Municipal Urban Tree Inventories of Selected Major Cities in North America and Europe." Arboriculture & Urban Forestry 38, no. 1 (January 1, 2012): 24–30. http://dx.doi.org/10.48044/jauf.2012.005.
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Effective management of the urban forest calls for municipalities to have a tree inventory of their urban resource. The approach to urban forestry is rather different in Europe and North America, both in terms of background and culture. This contribution discusses similarities and differences in tree inventory practices, based on a pilot study of three major cities in North America (Toronto, Ontario, Canada; and Boston, Massachusetts and New York City, New York, U.S.) and three major cities in Northern Europe (Oslo, Norway; and Aarhus and Copenhagen, Denmark). The pilot study consisted of semi-structured expert interviews in each city, and an analysis of their tree inventories in terms of their level of detail, how they were undertaken, and how they have been used. Each of the cities, with exception of Oslo, had inventoried all of their street trees. Volunteers were only used in Boston and New York City. None of the cities had developed a management plan based on their tree inventory. The inventory had only been completely incorporated into the work order system in New York City and Toronto. This explorative study shows that more research is needed to investigate what subsequently happens to tree inventories in municipalities after they have been performed. Moreover, more work is needed to identify whether inventories are being utilized to their full advantage in terms of producing management plans. Some key themes for further research are described. The set up of this pilot study could serve as a format for comprehensive research.
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Rosatte, Rick, and Mike Allan. "The Ecology of Red Foxes, Vulpes vulpes, in Metropolitan Toronto, Ontario: Disease Management Implications." Canadian Field-Naturalist 123, no. 3 (July 1, 2009): 215. http://dx.doi.org/10.22621/cfn.v123i3.967.
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During 1989-1992, 33 Red Foxes (Vulpes vulpes) were fitted with radio-collars in metropolitan Toronto to study their behaviour which would provide data to assist with the design of a rabies control strategy for urban areas of Ontario. Annual home range size for adult foxes (avg = 325 ha, SD = 207) was significantly larger than that of juvenile foxes (avg = 165 ha, SD = 176), but we could not detect any seasonal differences in home range size for foxes. Mean (SD) nightly ranges were 38.3 ha (48.3) in spring, 97.4 ha (115.4) in summer, 26.8 ha (28.5) in fall, and 16.3 ha (13.6) in winter. Movements by foxes during the period from June to November averaged 3.5 km (2.89). Eleven of the foxes were known to have dispersed (? 3 km from their home range), but we could not detect a mean direction of dispersal. Thirty-six percent (4/11) of the foxes dispersed in December and 18% (2/11) dispersed in August, with the remainder dispersing between February and November. Average dispersal distance was 19.3 km (15.6), and a significant negative correlation was detected between initial home range size and dispersal distance of foxes. Mortality of radio-collared foxes was caused by collisions with automobiles, predation, and shooting. Foxes made extensive use of ravines and other greenbelt areas, such as parks and golf courses. Residential areas were also used by some foxes. Knowledge of the habitats frequented by foxes as well as their movement potential assisted researchers in determining where vaccine baits should be placed for the control of rabies in Red Foxes in metropolitan Toronto.
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Conway, Tenley, Jihan Khatib, Janele Tetreult, and Andrew Almas. "A Private Tree By-Law’s Contribution to Maintaining a Diverse Urban Forest: Exploring Homeowners’ Replanting Compliance and the Role of Construction Activities in Toronto, Canada." Arboriculture & Urban Forestry 48, no. 1 (January 1, 2022): 9–26. http://dx.doi.org/10.48044/jauf.2022.002.
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Many municipalities are working to protect and grow their urban forest, including adopting private tree regulations. Such regulations typically require property-owners to apply for a permit to remove trees and, if the permit is granted, plant replacement trees. Even with such regulations, many private trees are removed each year, particularly on residential property. Property-level construction activity, including expanding building footprints, replacing an older home with a new one, and increasing hardscaping, is emerging as a key driver of residential tree loss. This study addresses whether homeowners who receive a permit to remove one or more trees comply with the requirement to plant replacement trees to better understand the effect of private tree regulation. We explore this question through a written survey of homeowners who received a tree removal permit and site visits in Toronto (Ontario, Canada). While 70% of all survey participants planted the required replacement trees 2 to 3 years after receiving the permit, only 54% of homeowners whose permit was associated with construction planted. Additionally, most replacement trees were in good health but were dominated by a few genera. We also found significant differences in replacement planting and tree survival across the city’s 4 management districts. This study highlights that if resources supporting private tree regulations are limited, tree permits associated with construction should be prioritized for follow-up. Additionally, guidance about diverse species to plant should be communicated to ensure that private tree regulations are supporting the long-term protection of the urban forest.
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Hallett, Rebecca H., and James D. Heal. "First Nearctic record of the swede midge (Diptera: Cecidomyiidae), a pest of cruciferous crops from Europe." Canadian Entomologist 133, no. 5 (October 2001): 713–15. http://dx.doi.org/10.4039/ent133713-5.
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In 1996, damage symptoms typical of the swede midge, Contarinia nasturtii (Keiffer), were observed on broccoli, Brassica oleracea L. var. italica (Brassicaceae), crops east of Toronto, Ontario. Early attempts to identify an associated insect larva were unsuccessful, and damage symptoms became mistakenly attributed to nutrient deficiencies (T Clarke, personal communication). Between 1996 and 1999, damaged plants were seen by growers regularly, and resulted in up to 85% loss of marketable yield (T Clarke, personal communication). In June 2000, we initiated investigations at two sites 12 km apart to determine the causal organism of this damage. Both sites were located at farms where cole crops are primarily -gown and from where the first damage reports originated.
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Raffoul, Melissa, Stephen J. Hecnar, Stephanie Prezioso, Darlene R. Hecnar, and Graham J. Thompson. "Trap response and genetic structure of eastern subterranean termites (Isoptera: Rhinotermitidae) in Point Pelee National Park, Ontario, Canada." Canadian Entomologist 143, no. 3 (June 2011): 263–71. http://dx.doi.org/10.4039/n11-008.
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AbstractReticulitermes flavipes (Kollar) is best known throughout southwestern counties of Ontario, Canada, as an urban pest. Little is known, however, of the presence of this termite in nonurban settings in Ontario. In this study, we confirmed the existence of a population of R. flavipes on the shores of Lake Erie within Point Pelee National Park. A systematic trap survey conducted along the park's semi-vegetated west beach revealed several zones of termite activity. An analysis of trap response at one location indicated an association between termite activity and smaller sized, moderately decayed woody debris. Further, microsatellite DNA analysis suggested the presence of at least three genetically distinct colonies, each likely headed by multiple inbred reproductives. Together these data suggest that termite activity is linked to food quality, and that single colonies are potentially long-lived through multiple generations of inbreeding. Assuming it is derived from a population reported from Point Pelee in 1929, the study population is the oldest known eastern subterranean termite population in Ontario.
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Dupuis-Desormeaux, Marc, Christina Davy, Amy Lathrop, Emma Followes, Andrew Ramesbottom, Andrea Chreston, and Suzanne E. MacDonald. "Colonization and usage of an artificial urban wetland complex by freshwater turtles." PeerJ 6 (August 8, 2018): e5423. http://dx.doi.org/10.7717/peerj.5423.
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Conservation authorities invest heavily in the restoration and/or creation of wetlands to counteract the destruction of habitat caused by urbanization. Monitoring the colonization of these new wetlands is critical to an adaptive management process. We conducted a turtle mark-recapture survey in a 250 ha artificially created wetland complex in a large North American city (Toronto, Ontario). We found that two of Ontario’s eight native turtle species (Snapping turtle (SN), Chelydra serpentina, and Midland Painted (MP) turtle, Chrysemys picta marginata) were abundant and both were confirmed nesting. The Blanding’s turtle (Emydoidea blandingii) was present but not well established. Species richness and turtle density were not equally distributed throughout the wetland complex. We noted SN almost exclusively populated one water body, while other areas of the wetland had a varying representation of both species. The sex ratios of both SN and MP turtles were 1:1. We tracked the movement of Snapping and Blanding’s turtles and found that most turtles explored at least two water bodies in the park, that females explored more water bodies than males, and that 95% of turtles showed fidelity to individual overwintering wetlands. We performed DNA analysis of two Blanding’s turtles found in the created wetlands and could not assign these turtles to any known profiled populations. The genetic data suggest that the turtles probably belong to a remnant local population. We discuss the implications of our results for connectivity of artificial wetlands and the importance of the whole wetland complex to this turtle assemblage.
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Scott, John D., and Lance A. Durden. "Songbird-transported tick Ixodes minor (Ixodida: Ixodidae) discovered in Canada." Canadian Entomologist 147, no. 1 (June 5, 2014): 46–50. http://dx.doi.org/10.4039/tce.2014.34.
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AbstractTicks are carried into Canada by millions of birds during spring migration, and some of these blood-sucking ectoparasites harbour tick-associated pathogens. During a pan-Canadian study of ticks on avian hosts, we identified an extralimital tick, Ixodes minor Neumann (Ixodida: Ixodidae) collected from a Common Yellowthroat, Geothlypis trichas (Linnaeus) (Passeriformes: Parulidae) at Toronto, Ontario, Canada. Although the I. minor larva was not tested for any tick-borne pathogens, this tick species is considered a competent enzootic vector of the Lyme disease spirochete, Borrelia burgdorferi Johnson, Schmid, Hyde, Steigerwalt, and Brenner sensu lato (s.l.). Epidemiologically, diverse B. burgdorferi s.l. genospecies have been detected in, or isolated from I. minor, and this tick species potentially represents a public health risk not only in the southeastern United States of America, where I. minor is indigenous, but also in Canada. This tick collection is the northernmost report of I. minor in North America, and constitutes the first documentation of this tick species in Canada.
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Staley, Zachery R., Josey Grabuski, Ed Sverko, and Thomas A. Edge. "Comparison of Microbial and Chemical Source Tracking Markers To Identify Fecal Contamination Sources in the Humber River (Toronto, Ontario, Canada) and Associated Storm Water Outfalls." Applied and Environmental Microbiology 82, no. 21 (August 19, 2016): 6357–66. http://dx.doi.org/10.1128/aem.01675-16.
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ABSTRACTStorm water runoff is a major source of pollution, and understanding the components of storm water discharge is essential to remediation efforts and proper assessment of risks to human and ecosystem health. In this study, culturableEscherichia coliand ampicillin-resistantE. colilevels were quantified and microbial source tracking (MST) markers (including markers for generalBacteroidalesspp., human, ruminant/cow, gull, and dog) were detected in storm water outfalls and sites along the Humber River in Toronto, Ontario, Canada, and enumerated via endpoint PCR and quantitative PCR (qPCR). Additionally, chemical source tracking (CST) markers specific for human wastewater (caffeine, carbamazepine, codeine, cotinine, acetaminophen, and acesulfame) were quantified. Human and gull fecal sources were detected at all sites, although concentrations of the human fecal marker were higher, particularly in outfalls (mean outfall concentrations of 4.22 log10copies, expressed as copy numbers [CN]/100 milliliters for human and 0.46 log10CN/100 milliliters for gull). Higher concentrations of caffeine, acetaminophen, acesulfame,E. coli, and the human fecal marker were indicative of greater raw sewage contamination at several sites (maximum concentrations of 34,800 ng/liter, 5,120 ng/liter, 9,720 ng/liter, 5.26 log10CFU/100 ml, and 7.65 log10CN/100 ml, respectively). These results indicate pervasive sewage contamination at storm water outfalls and throughout the Humber River, with multiple lines of evidence identifying Black Creek and two storm water outfalls with prominent sewage cross-connection problems requiring remediation. Limited data are available on specific sources of pollution in storm water, though our results indicate the value of using both MST and CST methodologies to more reliably assess sewage contamination in impacted watersheds.IMPORTANCEStorm water runoff is one of the most prominent non-point sources of biological and chemical contaminants which can potentially degrade water quality and pose risks to human and ecosystem health. Therefore, identifying fecal contamination in storm water runoff and outfalls is essential for remediation efforts to reduce risks to public health. This study employed multiple methods of identifying levels and sources of fecal contamination in both river and storm water outfall sites, evaluating the efficacy of using culture-based enumeration ofE. coli, molecular methods of determining the source(s) of contamination, and CST markers as indicators of fecal contamination. The results identified pervasive human sewage contamination in storm water outfalls and throughout an urban watershed and highlight the utility of using both MST and CST to identify raw sewage contamination.
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Guiry, E., and M. Buckley. "Urban rats have less variable, higher protein diets." Proceedings of the Royal Society B: Biological Sciences 285, no. 1889 (October 17, 2018): 20181441. http://dx.doi.org/10.1098/rspb.2018.1441.
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Over the past 1000 years, rats ( Rattus spp.) have become one of the most successful and prolific pests in human society. Despite their cosmopolitan distribution across six continents and ubiquity throughout the world's cities, rat urban ecology remains poorly understood. We investigate the role of human foods in brown rat ( Rattus norvegicus ) diets in urban and rural areas over a 100 year period ( ca AD 1790–1890) in Toronto, Canada using stable carbon ( δ 13 C) and nitrogen ( δ 15 N) isotope analyses of archaeological remains. We found that rat diets from urban sites were of higher quality and were more homogeneous and stable over time. By contrast, in rural areas, they show a wide range of dietary niche specializations that directly overlap, and probably competed, with native omnivorous and herbivorous species. These results demonstrate a link between rodent diets and human population density, providing, to our knowledge, the first long-term dietary perspective on the relative value of different types of human settlements as rodent habitat. This study highlights the potential of using the historical and archaeological record to provide a retrospective on the urban ecology of commensal and synanthropic animals that could be useful for improving animal management and conservation strategies in urban areas.
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Heard, Stephen B., and Graham H. Cox. "Plant module size and attack by the goldenrod spindle-gall moth." Canadian Entomologist 141, no. 4 (August 2009): 406–14. http://dx.doi.org/10.4039/n09-016.
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AbstractLarvae of the gall-inducing moth Gnorimoschema gallaesolidaginis (Riley) (Lepidoptera: Gelechiidae) attack ramets of Solidago altissima L. and S. gigantea Aiton (Asteraceae), initiating stem galls early in ramet growth. We examined the relationship between ramet size (as an indicator of plant vigour) and galling rate over 3 years at a field site in Toronto, Ontario, Canada. We marked Solidago ramets along line transects, measured their stem diameter, and recorded their fate (galled or ungalled) during the season. For S. altissima, galls were numerous enough for analysis in 2 years, and the frequency of galling increased monotonically with ramet stem diameter in both years. For S. gigantea, galls were numerous enough for analysis in all 3 years, but attack rate - stem diameter relationships were complex. In 2004 the galling frequency peaked at intermediate stem diameter, but in 2005 the galling frequency increased monotonically with stem diameter (and in 2006 the nonsignificant trend was similar). Overall, our data are most consistent with the plant-vigour hypothesis, but the 2004 data for S. gigantea lend some support to the suggestion that herbivore attack might sometimes be most intense on intermediate-sized modules.
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Hasler, Caleb T., Kevin Robinson, Nick Stow, and Shawn R. Taylor. "Population size and spatial ecology of Blanding’s Turtle (Emydoidea blandingii) in South March Highlands, Ottawa, Ontario, Canada." Canadian Journal of Zoology 93, no. 7 (July 2015): 509–14. http://dx.doi.org/10.1139/cjz-2015-0064.
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Between 2010 and 2011, an arterial road was constructed within provincially significant wetlands in the South March Highlands (SMH) located in Ottawa, Ontario, Canada. The wetlands and adjacent upland areas were determined to be sensitive habitat for Blanding’s Turtles (Emydoidea blandingii (Holbrook, 1838)) during the approval and permitting process, and a population study was required as part of the road construction project. The study consisted of a 4-year mark–recapture program and a movement study of radio-tagged adult turtles. General findings included the identification of 27 adult males and 55 females and a population estimate of 93 adults (95% Cl: 86–118). A 1:2.32 male to female sex bias was also found. Mean home-range size was 19.06 ha and tagged turtles moved, on average, more per observation in 2013 (191.40 m compared with 89.75 and 123.04 m in 2011 and 2012, respectively). Previously reported differences in movement patterns between males, females, and gravid females were not observed. The SMH Blanding’s Turtle population should be closely monitored because urban development continues in the area, which may further reduce the population size. Understanding the biology of imperiled populations across species’ ranges is necessary to promote conservation and adaptive wildlife management.
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Brook, Marisa, and Sali A. Tagliamonte. "Subject relative who in Ontario, Canada: Change from above in a transplanted ecology." Journal of Linguistic Geography, October 28, 2022, 1–13. http://dx.doi.org/10.1017/jlg.2022.10.
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Abstract Who as a restrictive relativizer in English is an old change from above. In urban dialects, it still acts as a prestige form, whereas it is infrequent or negligible in rural British and American varieties. We compare earlier findings from Toronto, the largest city in the province of Ontario (D’Arcy & Tagliamonte, 2010), with a range of communities from the Ontario Dialects Project (Tagliamonte, 2003–present). While none of the rural locations has as much who as Toronto, there is a substantial range. Regions along the major highways to the north and east of the city have more who, while the smaller towns in less accessible locations have less, consistent with a Cascade Model effect (Labov, 2003). Nonetheless, who shows evidence of diffusion, increasing in apparent time in recent decades. We suggest that this reflects overt pressure from above, consistent with the enduring role that prestige plays in English relativizer variation.
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Anderson, Vidya, and William A. Gough. "Nature-based cooling potential: a multi-type green infrastructure evaluation in Toronto, Ontario, Canada." International Journal of Biometeorology, March 30, 2021. http://dx.doi.org/10.1007/s00484-021-02100-5.
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AbstractThe application of green infrastructure presents an opportunity to mitigate rising temperatures using a multi-faceted ecosystems-based approach. A controlled field study in Toronto, Ontario, Canada, evaluates the impact of nature-based solutions on near surface air temperature regulation focusing on different applications of green infrastructure. A field campaign was undertaken over the course of two summers to measure the impact of green roofs, green walls, urban vegetation and forestry systems, and urban agriculture systems on near surface air temperature. This study demonstrates that multiple types of green infrastructure applications are beneficial in regulating near surface air temperature and are not limited to specific treatments. Widespread usage of green infrastructure could be a viable strategy to cool cities and improve urban climate.
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French, Shannon K., David L. Pearl, William B. Sutton, Andrew S. Peregrine, and Claire M. Jardine. "Environmental factors associated with Baylisascaris procyonis infection from a population of raccoons in Toronto, Ontario, Canada." Urban Ecosystems, October 30, 2021. http://dx.doi.org/10.1007/s11252-021-01177-5.
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Conway, Tenley, and Adrian Lue. "Resident Knowledge and Support for Private Tree By-Laws in the Greater Toronto Area." Arboriculture & Urban Forestry 44, no. 4 (July 1, 2018). http://dx.doi.org/10.48044/jauf.2018.016.
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Urban municipalities across North America are developing policies to protect and manage not only public trees but also the numerous trees located on private property. One approach is the creation of private tree by-laws or ordinances that regulate tree removal on all private property through a permitting process. These regulations can successfully protect the private urban forest, particularly larger trees, but their success is dependent on landowners’ willingness to comply given the difficulties of enforcement. This study examines residents’ awareness and support for private tree by-laws in three cities in the Greater Toronto Area (Ontario, Canada) through a written survey that targeted neighborhoods with high tree canopy—places most likely to have trees regulated under the private tree by-laws. Basic awareness about by-laws varied across the five study neighborhoods, and support for specific components of the by-law, including size and number of trees regulated, tree replacement requirements, and permit fees was also mixed. While a larger number of survey respondents felt that their city should not regulate trees on private land than had supported the current by-law, this was still not a majority of responses. Participants with more trees on their property or who had planted trees were significantly more supportive of the regulations, while several socio-demographic characteristics were also significantly related to level of support for the by-laws. The management implications of these results are discussed.
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Vander Vecht, Jennifer, and Tenley Conway. "Comparing Species Composition and Planting Trends: Exploring Pest Vulnerability in Toronto’s Urban Forest." Arboriculture & Urban Forestry 41, no. 1 (January 1, 2015). http://dx.doi.org/10.48044/jauf.2015.004.
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Urban forests represent a valuable resource for cities but are not without costs. These costs can include time, money, and the loss of beneficial services as results of pest infestations. Knowledge of an urban forest’s tree species composition and vulnerability to pests is needed to help managers enhance services delivered, while minimizing expenses over the long-term. Recent research has explored the impacts of individual pests on urban forests, but less attention has been given to the overall pest vulnerability. In this research, tree genera currently prevalent and commonly planted in Toronto, Ontario, Canada, were analyzed using a pest vulnerability matrix to explore how the city’s urban forest species composition and pest vulnerability may be changing. Current tree species composition was derived from existing inventory data, while the planting trends of a variety of local actors were determined through surveys and interviews. Results indicate there is somewhat limited diversity in current street and non-street tree populations, as well as a number of common tree species that have severe pest vulnerabilities. While new plantings replicate some current composition and pest vulnerability issues, several less common species are also being planted. As a result, overall pest vulnerability should decrease in the future, while some ongoing management concerns remain.
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Steenberg, James, Andrew Millward, David Nowak, Pamela Robinson, and Sandy Smith. "A Social-Ecological Analysis of Urban Tree Vulnerability for Publicly Owned Trees in a Residential Neighborhood." Arboriculture & Urban Forestry 45, no. 1 (January 4, 2019). http://dx.doi.org/10.48044/jauf.2019.002.
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The urban forest is a valuable ecosystem service provider, yet cities are frequently degraded environments with a myriad of stressors and disturbances affecting trees. Vulnerability science is increasingly used to explore issues of sustainability in complex social-ecological systems, and can be a useful approach for assessing urban forests. The purpose of this study was to identify and explore drivers of urban forest vulnerability in a residential neighborhood. Based on a recently published framework of urban forest vulnerability, a series of indicators of exposure, sensitivity, and adaptive capacity that describe the built environment, urban forest structure, and human population, respectively, were assessed for 806 trees in Toronto, Ontario, Canada. Tree mortality, condition, and diameter growth rates were then assessed using an existing 2007/2008 inventory. A bivariate analysis was first conducted to test for significant relationships of vulnerability indicators with mortality, condition, and growth. A multivariate analysis was then conducted using multiple linear regression for the continuous condition and growth variables and a multilayer perceptron neural network for the binary mortality variable. Commercial land uses and commercial buildings adjacent to trees consistently explained higher mortality rates and poor tree conditions. However, at finer spatial scales it is important to differentiate between different causes and correlates of urban forest decline within commercial land uses. Tree species, size, and condition were also important indicators of vulnerability. Understanding the causes of urban forest change and decline are essential for developing planning strategies to reduce long-term system vulnerability.
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Rivkin, L. Ruth, and Marc T. J. Johnson. "The impact of urbanization on outcrossing rate and population genetic variation in the native wildflower, Impatiens capensis." Journal of Urban Ecology 8, no. 1 (2022). http://dx.doi.org/10.1093/jue/juac009.
Full textAbstract:
Abstract Cities are one of the fastest growing ecosystems on the planet, and conserving urban biodiversity is of primary importance. Urbanization increases habitat fragmentation and may be particularly problematic for native plant species which often exist in small, remnant populations in cities. We studied the effects of urbanization on Impatiens capensis, a self-compatible native wildflower, which is an important nectar and pollen source for native bees and hummingbirds. We sampled I. capensis from six populations located in urban and rural habitats in Toronto, Ontario, Canada. We sequenced the DNA of 43 families (N = 86 individuals) using genotype-by-sequencing to obtain 5627 single nucleotide polymorphisms. From each parent and offspring, we estimated individual outcrossing rates, population-level genetic diversity and genetic structure among populations. We found that 95% of plants were outcrossed, and populations were genetically differentiated, where urban populations contained a subset of the genetic variation found in rural populations. Urban populations exhibited lower genetic diversity than rural populations, and we detected a relationship between population census size and habitat on genetic diversity. Despite high outcrossing rates, our results suggest that urbanization reduces the genetic diversity of I. capensis populations, potentially increasing the vulnerability of these populations to long-term population declines and extirpation in response to urbanization.
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"18th Annual Meeting of the Human Biology Council Toronto, Ontario, Canada, April 13-15, 1993." American Journal of Human Biology 5, no. 1 (1993): 125–42. http://dx.doi.org/10.1002/ajhb.1310050122.
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Thompson, Connor A., Jay R. Malcolm, and Brent R. Patterson. "Individual and Temporal Variation in Use of Residential Areas by Urban Coyotes." Frontiers in Ecology and Evolution 9 (June 1, 2021). http://dx.doi.org/10.3389/fevo.2021.687504.
Full textAbstract:
Coyotes (Canis latrans) have established populations in most major urban centers across North America. While the risk of attacks on humans or their pets is low, the presence of carnivores in areas with high human use has resulted in increased public concern. Having a clearer understanding of which animals are more likely to interact with humans and when interactions are more likely to occur will help mitigate human-carnivore conflicts. Despite clear broad-scale patterns of human avoidance, human-coyote interactions occur most frequently in residential areas. Our purpose was to determine if use of residential areas varied consistently across individuals or time. We used locations from GPS collars deployed on 14 coyotes in the Greater Toronto Area, Ontario, Canada from 2012 to 2017 to fit a step selection function. Average (±SE) home range size estimates were 17.3 ± 4.6 km2 for resident coyotes and 102.8 ± 32.9 km2 for non-residents. We found that coyotes used natural areas more (β = 0.07, SE = 0.02, p < 0.0001), and roads (β = −0.50, SE = 0.13, p < 0.0001) and residential areas (β = −0.79, SE = 0.21, p = 0.0001) less during the day than at night. We also found that coyotes were more likely to use residential areas in the breeding season from January to April (β = 0.69, SE = 0.20, p = 0.0007) and the pup rearing season from May to August (β = 0.54, SE = 0.13, p < 0.0001) than in the dispersal season from September to December. Lastly, we found that resident coyotes were less likely to use residential areas than non-resident coyotes (β = −1.13, SE = 0.26, p < 0.0001). As far as we are aware, our study is the first to identify the seasons when coyotes are more likely to use residential areas. The seasonal patterns in habitat use that we observed reflect patterns that have been previously reported for human-coyote conflicts. Our results demonstrate that reducing the availability of anthropogenic food sources in residential areas, particularly in the winter and spring, should be a priority for managers aiming to reduce human-coyote conflict in urban areas.
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Turgeon, J. J., B. Gasman, M. T. Smith, J. H. Pedlar, M. Orr, R. E. Fournier, J. Doyle, J. Ric, and T. Scarr. "Canada’s response to invasion by Asian longhorned beetle (Coleoptera: Cerambycidae) in Ontario." Canadian Entomologist 154, s1 (2022). http://dx.doi.org/10.4039/tce.2021.60.
Full textAbstract:
Abstract A reproductive population of the Asian longhorned beetle, Anoplophora glabripennis (Motschulsky) (Coleoptera: Cerambycidae), an adventive insect from Asia, was discovered in 2003 in an urban landscape in Ontario, Canada. This polyphagous beetle, which attacks maples, Acer spp. (Sapindaceae), had the potential to seriously and permanently alter the composition and structure of forests in eastern North America. The Canadian Food Inspection Agency (CFIA) developed and implemented an eradication programme, with partners from various agencies in both Canada and the United States of America. Surveys were used to delineate the infestation and establish a regulated area around it. Treatment consisted of removing and destroying both trees with signs of A. glabripennis injury and trees assumed at high risk of being injured within the regulated area. After nine years of monitoring the regulated area, the CFIA declared A. glabripennis eradicated on 5 April 2013. Herein, we detail the response undertaken, summarise lessons learned, and provide preliminary observations and results pertaining to the arrival, establishment, and spread of A. glabripennis in Ontario.
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Turgeon, J. J., B. Gasman, M. T. Smith, J. H. Pedlar, M. Orr, R. E. Fournier, J. Doyle, J. Ric, and T. Scarr. "Canada’s response to invasion by Asian longhorned beetle (Coleoptera: Cerambycidae) in Ontario." Canadian Entomologist 154, s1 (2022). http://dx.doi.org/10.4039/tce.2021.60.
Full textAbstract:
Abstract A reproductive population of the Asian longhorned beetle, Anoplophora glabripennis (Motschulsky) (Coleoptera: Cerambycidae), an adventive insect from Asia, was discovered in 2003 in an urban landscape in Ontario, Canada. This polyphagous beetle, which attacks maples, Acer spp. (Sapindaceae), had the potential to seriously and permanently alter the composition and structure of forests in eastern North America. The Canadian Food Inspection Agency (CFIA) developed and implemented an eradication programme, with partners from various agencies in both Canada and the United States of America. Surveys were used to delineate the infestation and establish a regulated area around it. Treatment consisted of removing and destroying both trees with signs of A. glabripennis injury and trees assumed at high risk of being injured within the regulated area. After nine years of monitoring the regulated area, the CFIA declared A. glabripennis eradicated on 5 April 2013. Herein, we detail the response undertaken, summarise lessons learned, and provide preliminary observations and results pertaining to the arrival, establishment, and spread of A. glabripennis in Ontario.
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Turgeon, J. J., B. Gasman, M. T. Smith, J. H. Pedlar, M. Orr, R. E. Fournier, J. Doyle, J. Ric, and T. Scarr. "Canada’s response to invasion by Asian longhorned beetle (Coleoptera: Cerambycidae) in Ontario." Canadian Entomologist 154, s1 (2022). http://dx.doi.org/10.4039/tce.2021.60.
Full textAbstract:
Abstract A reproductive population of the Asian longhorned beetle, Anoplophora glabripennis (Motschulsky) (Coleoptera: Cerambycidae), an adventive insect from Asia, was discovered in 2003 in an urban landscape in Ontario, Canada. This polyphagous beetle, which attacks maples, Acer spp. (Sapindaceae), had the potential to seriously and permanently alter the composition and structure of forests in eastern North America. The Canadian Food Inspection Agency (CFIA) developed and implemented an eradication programme, with partners from various agencies in both Canada and the United States of America. Surveys were used to delineate the infestation and establish a regulated area around it. Treatment consisted of removing and destroying both trees with signs of A. glabripennis injury and trees assumed at high risk of being injured within the regulated area. After nine years of monitoring the regulated area, the CFIA declared A. glabripennis eradicated on 5 April 2013. Herein, we detail the response undertaken, summarise lessons learned, and provide preliminary observations and results pertaining to the arrival, establishment, and spread of A. glabripennis in Ontario.