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Artículos de revistas sobre el tema "Ecology – Ontario – Hamilton"

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Publicado: 25 de julio de 2024

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1

Munawar, M., M. Fitzpatrick, H. Niblock, H. Kling, R. Rozon y J. Lorimer. "Phytoplankton ecology of a culturally eutrophic embayment: Hamilton Harbour, Lake Ontario". Aquatic Ecosystem Health & Management 20, n.º 3 (3 de julio de 2017): 201–13. http://dx.doi.org/10.1080/14634988.2017.1307678.

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2

Gebauer, Martin B., Rob Z. Dobos y D. Vaughn Weseloh. "Waterbird Surveys at Hamilton Harbour, Lake Ontario, 1985–1988". Journal of Great Lakes Research 18, n.º 3 (enero de 1992): 420–39. http://dx.doi.org/10.1016/s0380-1330(92)71309-4.

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3

Halfon, Efraim. "Volume Visualization of Temperature in Hamilton Harbour, Lake Ontario". Journal of Great Lakes Research 22, n.º 1 (enero de 1996): 15–25. http://dx.doi.org/10.1016/s0380-1330(96)70930-9.

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4

Rothfels, Carl. "Significant Vascular Plant Records from the Hamilton Area, Ontario". Canadian Field-Naturalist 118, n.º 4 (1 de octubre de 2004): 612. http://dx.doi.org/10.22621/cfn.v118i4.68.

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Four additions to the known vascular flora of Ontario (Aesculus pavia, Ambrosia × helenae, Anthriscus caucalis, Verbena bonariensis) and ten other provincially significant records are discussed. Of the 14 taxa listed, two (Actaea × ludovici and Ambrosia × helenae) are native.
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5

Brooks, J. L., J. D. Midwood, L. F. G. Gutowsky, C. M. Boston, S. E. Doka, J. A. Hoyle y S. J. Cooke. "Spatial ecology of reintroduced walleye (Sander vitreus) in Hamilton Harbour of Lake Ontario". Journal of Great Lakes Research 45, n.º 1 (febrero de 2019): 167–75. http://dx.doi.org/10.1016/j.jglr.2018.11.011.

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6

Metcalfe, C. D., V. W. Cairns y J. D. Fitzsimons. "Experimental Induction of Liver Tumours in Rainbow Trout (Salmo gairdneri) by Contaminated Sediment from Hamilton Harbour, Ontario". Canadian Journal of Fisheries and Aquatic Sciences 45, n.º 12 (1 de diciembre de 1988): 2161–67. http://dx.doi.org/10.1139/f88-251.

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Sediments from Hamilton Harbour and an uncontaminated control site were collected and extracted for organic contaminants to investigate the putative association between chemical contaminants and high incidences of fish tumours in Hamilton Harbour. Sediment extract from Hamilton Harbour had high levels of polynuclear aromatic hydrocarbons and was mutagenic in the Ames bacterial mutagenicity assay. In two sets of experiments using a trout sac-fry microinjection route of exposure, Hamilton Harbour sediment extract induced hepatocellular carcinomas in rainbow trout (Salmo gairdneri).
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7

Milani, Danielle, Lee Grapentine, Debbie A. Burniston, Matt Graham y Chris Marvin. "Trends in sediment quality in Hamilton Harbour, Lake Ontario". Aquatic Ecosystem Health & Management 20, n.º 3 (3 de julio de 2017): 295–307. http://dx.doi.org/10.1080/14634988.2017.1302780.

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8

Weatherhead, Patrick J. y Gordon F. Bennett. "Ecology of parasitism of Brown-headed Cowbirds by haematozoa". Canadian Journal of Zoology 70, n.º 1 (1 de enero de 1992): 1–7. http://dx.doi.org/10.1139/z92-001.

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We quantified haematozoa infections in 964 Brown-headed Cowbirds (Molothrus ater) sampled over three summers in eastern Ontario. Our objective was to use the cowbird–haematozoa system to assess practical and theoretical aspects of testing Hamilton and Zuk's parasite hypothesis of sexual selection. We found that most individuals resampled within and between years were consistently scored as parasitized or unparasitized, although some individuals changed status, including going from parasitized to unparasitized. Many hatching-year birds were parasitized, which suggests substantial early exposure to parasites. Significant variation within and between years in general parasite prevalence, specific parasite prevalence, and intensity of infections indicated that population estimates of parasitism would be highly dependent on when birds were sampled and on the age and sex composition of the sample. Analysis of body condition and within-season recapture patterns indicated that parasitism did not have a negative effect on the health of cowbirds. Parasitized birds were also recaptured at the same rate as unparasitized birds between years, indicating that there were no viability effects due to parasitism. Our results suggest a number of pitfalls, some of which are potentially critical, to using haematozoa infections in passerines to test the Hamilton and Zuk hypothesis.
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9

Barica, J. "Unique Limnological Phenomena Affecting Water Quality of Hamilton Harbour, Lake Ontario". Journal of Great Lakes Research 15, n.º 3 (enero de 1989): 519–30. http://dx.doi.org/10.1016/s0380-1330(89)71507-0.

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10

Boyce, F. M., P. F. Hamblin, D. G. Robertson y F. Chiocchio. "Evaluation of Sediment Traps in Lake St. Clair, Lake Ontario, and Hamilton Harbour". Journal of Great Lakes Research 16, n.º 3 (enero de 1990): 366–79. http://dx.doi.org/10.1016/s0380-1330(90)71431-1.

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11

Poulton, D. J., K. J. Simpson, D. R. Barton y K. R. Lum. "Trace Metals and Benthic Invertebrates in Sediments of Nearshore Lake Ontario at Hamilton Harbour". Journal of Great Lakes Research 14, n.º 1 (enero de 1988): 52–65. http://dx.doi.org/10.1016/s0380-1330(88)71532-4.

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12

Holmes, John A. "Potential for Fisheries Rehabilitation in the Hamilton Harbour-Cootes Paradise Ecosystem of Lake Ontario". Journal of Great Lakes Research 14, n.º 2 (enero de 1988): 131–41. http://dx.doi.org/10.1016/s0380-1330(88)71541-5.

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13

Edwin Harvey, F., Shaun K. Frape y Robert J. Drimmie. "Isotopic Variations in Hamilton Harbour Water as an Indicator of Lake Ontario Exchange Flow". Journal of Great Lakes Research 23, n.º 2 (enero de 1997): 169–76. http://dx.doi.org/10.1016/s0380-1330(97)70894-3.

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14

Roy, R., R. Knowles y M. N. Charlton. "Nitrification and methane oxidation at the sediment surface in Hamilton Harbour (Lake Ontario)". Canadian Journal of Fisheries and Aquatic Sciences 53, n.º 11 (1 de noviembre de 1996): 2466–72. http://dx.doi.org/10.1139/f96-199.

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15

Bowen, K. L. y W. J. S. Currie. "Elevated zooplankton production in a eutrophic Lake Ontario embayment: Hamilton Harbour 2002–2014". Aquatic Ecosystem Health & Management 20, n.º 3 (3 de julio de 2017): 230–41. http://dx.doi.org/10.1080/14634988.2017.1294425.

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16

Leslie, John K. y Charles A. Timmins. "Distribution and Abundance of Larval Fish in Hamilton Harbour, a Severely Degraded Embayment of Lake Ontario". Journal of Great Lakes Research 18, n.º 4 (enero de 1992): 700–708. http://dx.doi.org/10.1016/s0380-1330(92)71330-6.

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17

Weseloh, D. V. (Chip), Premek Hamr, Christine A. Bishop y Ross J. Norstrom. "Organochlorine Contaminant Levels in Waterbird Species from Hamilton Harbour, Lake Ontario: an IJC Area of Concern". Journal of Great Lakes Research 21, n.º 1 (enero de 1995): 121–37. http://dx.doi.org/10.1016/s0380-1330(95)71026-7.

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18

Hamilton, K. G. A. "THE NEARCTIC LEAFHOPPER GENUS AURIDIUS: BIOLOGY, POLYMORPHISM AND NEW SPECIES (RHYNCHOTA: HOMOPTERA: CICADELLIDAE)". Canadian Entomologist 131, n.º 1 (febrero de 1999): 29–52. http://dx.doi.org/10.4039/ent13129-1.

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AbstractAuridius Oman is revised, and eight new species are described: aurigineus (California), cosmeticus (Montana), melinus (California), safra (Idaho–Oregon), sandaraca (Alberta–Ontario), sulphureus (New Mexico), thapsinus (Arizona–Nevada), and vitellinus (Oregon). Auridius gilvus Hamilton & Ross, 1972 is synonymized with A. auratus (Gillette and Baker 1895). The 12 known species are illustrated and keyed, with notes on host associations, phenology, wing polymorphism, and two new subspecies: A. ordinatus amarillo (southwestern Colorado – New Mexico) and A. ordinatus crocatus (British Columbia – Oregon).
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19

Curran, Kristian J., Kim N. Irvine, Ian G. Droppo y Thomas P. Murphy. "Suspended Solids, Trace Metal and PAH Concentrations and Loadings from Coal Pile Runoff to Hamilton Harbour, Ontario". Journal of Great Lakes Research 26, n.º 1 (enero de 2000): 18–30. http://dx.doi.org/10.1016/s0380-1330(00)70670-8.

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20

Yang, Jing-Rong, Hamish C. Duthie y L. Denis Delorme. "Reconstruction of the Recent Environmental History of Hamilton Harbour (Lake Ontario, Canada) from Analysis of Siliceous Microfossils". Journal of Great Lakes Research 19, n.º 1 (enero de 1993): 55–71. http://dx.doi.org/10.1016/s0380-1330(93)71198-3.

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21

Dermott, Ronald y Robert Bonnell. "Benthic fauna in Hamilton Harbour and adjacent Lake Ontario 2002–2005 in comparison to 1964". Aquatic Ecosystem Health & Management 13, n.º 4 (15 de noviembre de 2010): 413–28. http://dx.doi.org/10.1080/14634988.2010.521453.

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22

Munawar, M. y M. Fitzpatrick. "The application of Vollenweider's eutrophication models for assessing ecosystem health: Hamilton Harbour (Lake Ontario) example". Aquatic Ecosystem Health & Management 14, n.º 2 (abril de 2011): 204–8. http://dx.doi.org/10.1080/14634988.2011.577394.

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23

Boston, C. M., R. G. Randall, J. A. Hoyle, J. L. Mossman y J. N. Bowlby. "The fish community of Hamilton Harbour, Lake Ontario: Status, stressors, and remediation over 25 years". Aquatic Ecosystem Health & Management 19, n.º 2 (2 de abril de 2016): 206–18. http://dx.doi.org/10.1080/14634988.2015.1106290.

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24

Leisti, K. E., T. Theÿsmeÿer, S. E. Doka y A. Court. "Aquatic vegetation trends from 1992 to 2012 in Hamilton Harbour and Cootes Paradise, Lake Ontario". Aquatic Ecosystem Health & Management 19, n.º 2 (2 de abril de 2016): 219–29. http://dx.doi.org/10.1080/14634988.2015.1129257.

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25

Moffat, T., T. Galloway y J. Latham. "Stature and adiposity among children in contrasting neighborhoods in the city of Hamilton, Ontario, Canada". American Journal of Human Biology 17, n.º 3 (2005): 355–67. http://dx.doi.org/10.1002/ajhb.20125.

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26

Medeiros, Andrew S. y Lewis A. Molot. "Trends in Iron and Phosphorus Loading to Lake Ontario from Waste Water Treatment Plants in Hamilton and Toronto". Journal of Great Lakes Research 32, n.º 4 (2006): 788. http://dx.doi.org/10.3394/0380-1330(2006)32[788:tiiapl]2.0.co;2.

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27

Staniewski, Michael A., Mark Fitzpatrick, Iftekhar F. Munawar, Mohiuddin Munawar y Steven M. Short. "The influence of viruses on phytoplankton and bacterial productivity in Hamilton Harbour, an impaired embayment of Lake Ontario". Journal of Great Lakes Research 43, n.º 6 (diciembre de 2017): 1055–66. http://dx.doi.org/10.1016/j.jglr.2017.08.008.

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28

McDowell, Derek C. y Chris D. Metcalfe. "Phthalate Esters in Sediments Near a Sewage Treatment Plant Outflow in Hamilton Harbour, Ontario: SFE Extraction and Environmental Distribution". Journal of Great Lakes Research 27, n.º 1 (enero de 2001): 3–9. http://dx.doi.org/10.1016/s0380-1330(01)70618-1.

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29

Weatherhead, Patrick J. y Gordon F. Bennett. "Ecology of Red-winged Blackbird parasitism by haematozoa". Canadian Journal of Zoology 69, n.º 9 (1 de septiembre de 1991): 2352–59. http://dx.doi.org/10.1139/z91-331.

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We sampled haematozoa in Red-winged Blackbirds (Agelaius phoeniceus) over three consecutive breeding seasons in eastern Ontario to identify factors that affect the reliability of quantifying parasites as this pertains to testing Hamilton and Zuk's hypothesis of sexual selection. Parasite prevalence and intensity varied seasonally, indicating that for samples to be reliable they should not be taken either early or late in the breeding season, and analysis should be limited to prevalence (presence versus absence). Among males (but not females), parasite prevalence increased with age, indicating that all individuals are not exposed to parasites early in life, and therefore tests of the "parasite" hypothesis of sexual selection are best restricted to older individuals. Resampling of known individuals within and between years showed that some individuals changed from positive to negative. Prevalence estimates also varied by year, indicating that reliable estimates of prevalence for a species, necessary for interspecific tests of the parasite hypothesis, will require extensive sampling. Overall, parasite prevalence did not vary with habitat. Parasites were detectable in only 1 of 119 nestlings sampled, indicating either lack of exposure or inadequate time for infections to reach detectable intensities. In either case, it is not possible to test the assumption that parasite resistance is heritable using blood samples from nestlings. Although males and females were parasitized by the same array of parasites, the distribution of specific parasites differed significantly (males were more heavily parasitized by leucocytozoids). If males and females generally differ in either exposure or resistance to specific parasites, the coevolutionary dynamics between host and parasite and the implications for sexual selection will require reassessment.
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30

HALFON, EFRAIM y MORLEY HOWELL. "VISUALIZATION OF LIMNOLOGICAL DATA AS TWO- AND THREE-DIMENSIONAL COMPUTER GENERATED ANIMATIONS". Journal of Biological Systems 02, n.º 04 (diciembre de 1994): 443–52. http://dx.doi.org/10.1142/s0218339094000271.

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DATA ANIMATOR is a software program to develop and display limnological data as computer generated animations. The purpose of the program is to visualize in a dynamical fashion a variety of data collected in lakes. Examples are originated from Hamilton Harbour, Lake Ontario. Data collected at different stations and different times are interpolated in space and in time. Lake topography and lake bathymetry files are used to relate data collected in the lake(s) with topographical features. A graphic user interface allows the user to choose two- or three-dimensional views, a viewpoint, fonts, colour palette, data and keyframes. A typical 1800 frame animation can be displayed in a minute at 30 frames per second. Rendering time is about 12 hours. Animations can be displayed on a monitor or transferred to video tape.
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31

Minns, C. K., R. G. Randall, J. E. Moore y V. W. Cairns. "A model simulating the impact of habitat supply limits on northern pike, Essox lucius, in Hamilton Harbour, Lake Ontario". Canadian Journal of Fisheries and Aquatic Sciences 53, S1 (31 de diciembre de 1996): 20–34. http://dx.doi.org/10.1139/f95-258.

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32

TSUJITA, CAMERON J. y GORDON C. BAIRD. "TENTACULITIDS IN SUBVERTICAL (LIFE) POSITION IN THE MIDDLE DEVONIAN ARKONA FORMATION, SOUTHERN ONTARIO, CANADA". Palaios 39, n.º 4 (18 de abril de 2024): 113–26. http://dx.doi.org/10.2110/palo.2023.029.

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Abstract A horizon of aperture-up, subvertically oriented shells of Tentaculites in the Middle Devonian Arkona Formation (Hamilton Group) near Arkona, Ontario, Canada, is investigated with respect to burial processes, tentaculitid life habits, and associated diagenetic features. Field observations of the horizon in situ confirm previous suspicions that thick-walled tentaculitoids were benthic and oriented aperture-up in life. In this biocoenosis, tentaculitids vary from low-density populations to dense clumps, the latter sometimes showing grid-like arrangements. The mutual spacing of individuals reflects space demands of a feeding apparatus. The limited size range of the shells suggest that tentaculitid colonization event was brief, involving no more than two generational growth cohorts. Sedimentary features associated with the subvertical shells indicate that the seafloor mud inhabited by the tentaculitids was soft, but sufficiently cohesive to preserve microtopographic features, and prone to disturbance by storms. Preservation of their shells in (subvertical) life position necessitated rapid burial (via mud blanketing) without significant scouring. The emanation of sulfidic decay products from the tentaculitid shell apertures led to the local inhibition of later-precipitated calcareous concretionary cement. Preferential erosion of this material resulted in the development of circular pockmarks on concretion surfaces. The concretions themselves formed along a thin zone of alkalinity that developed below the sediment-water interface at the sulfate-methane boundary during a depositional hiatus sometime after the burial of the subvertical tentaculitids. Variations in the vertical positions of radially tilted tentaculitid shells apertures show undulations that, in turn, imply tentaculitids mutually adjusted their growth directions to maximize living space and/or food acquisition.
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33

Neff, Margaret R., Samantha Stefanoff y Satyendra P. Bhavsar. "Improvements in fish polychlorinated biphenyl and other contaminant levels in response to remedial actions in Hamilton Harbour, Ontario, Canada". Aquatic Ecosystem Health & Management 19, n.º 2 (2 de abril de 2016): 161–70. http://dx.doi.org/10.1080/14634988.2016.1139996.

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34

Quinn, J. S., R. D. Morris, H. Blokpoel, D. V. Weseloh y P. J. Ewins. "Design and management of bird nesting habitat: tactics for conserving colonial waterbird biodiversity on artificial islands in Hamilton Harbour, Ontario". Canadian Journal of Fisheries and Aquatic Sciences 53, S1 (31 de diciembre de 1996): 45–57. http://dx.doi.org/10.1139/f95-260.

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35

Gill, J. J., A. M. Svircev, R. Smith y A. J. Castle. "Bacteriophages of Erwinia amylovora". Applied and Environmental Microbiology 69, n.º 4 (abril de 2003): 2133–38. http://dx.doi.org/10.1128/aem.69.4.2133-2138.2003.

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ABSTRACT Fifty bacteriophage isolates of Erwinia amylovora, the causal agent of fire blight, were collected from sites in and around the Niagara region of southern Ontario and the Royal Botanical Gardens, Hamilton, Ontario. Forty-two phages survived the isolation, purification, and storage processes. The majority of the phages in the collection were isolated from the soil surrounding trees exhibiting fire blight symptoms. Only five phages were isolated from infected aerial tissue in pear and apple orchards. To avoid any single-host selection bias, six bacterial host strains were used in the initial isolation and enrichment processes. Molecular characterization of the phages with a combination of PCR and restriction endonuclease digestions showed that six distinct phage types, described as groups 1 to 6, were recovered. Ten phage isolates were related to the previously characterized E. amylovora PEa1, with some divergence of molecular markers between phages isolated from different sites. A study of the host ranges of the phages revealed that certain types were unable to efficiently lyse some E. amylovora strains and that some isolates were able to lyse the epiphytic bacterium Pantoea agglomerans. Representatives from the six molecular groups were studied by electron microscopy to determine their morphology. The phages exhibited distinct morphologies when examined by an electron microscope. Group 1 and 2 phages were tailed and contractile, and phages belonging to groups 3 to 6 had short tails or openings with thin appendages. Based on morphotypes, the bacteriophages of E. amylovora were placed in the order Caudovirales, in the families Myoviridae and Podoviridae.
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36

Pettitt, Karen E., Christine A. Bishop y Ronald J. Brooks. "Home range and movements of the Common Snapping Turtle, Chelydra serpentina serpentina, in a coastal wetland of Hamilton Harbour, Lake Ontario, Canada". Canadian field-naturalist 109, n.º 2 (1995): 192–200. http://dx.doi.org/10.5962/p.357611.

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37

Borgmann, U. y W. P. Norwood. "Identification of the toxic agent in metal-contaminated sediments from Manitouwadge Lake, Ontario, using toxicity–accumulation relationships in Hyalella azteca". Canadian Journal of Fisheries and Aquatic Sciences 54, n.º 5 (1 de mayo de 1997): 1055–63. http://dx.doi.org/10.1139/f97-021.

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Toxicity of sediments from Manitouwadge Lake, Ontario, to Hyalella correlated closely with bioaccumulation of zinc but not copper. Bioaccumulation in 1-week exposures was sufficient to infer chronic zinc toxicity. Close similarity between toxicity-accumulation relationships from Manitouwadge Lake and those obtained from zinc-spiked Hamilton Harbour sediments indicate that toxicity is due to zinc itself and not some other chemical that correlates with zinc in sediments. Sediment concentrations of zinc, on the other hand, are unreliable indicators of effects; toxicity was not highest in sediments from the most contaminated site. Copper accumulation was insufficient to cause short-term (1-week) toxicity. Chronic copper toxicity cannot be predicted from bioaccumulation, but the absence of a significant growth reduction, which is specific to copper, strongly suggests that the contribution of copper to chronic toxicity was minimal. Body concentrations of zinc and copper in wild animals from contaminated lakes (in contrast to laboratory animals exposed to sediments from those lakes) are not reliable indicators of metal toxicity, either because these amphipods have adapted to contaminated conditions or because they survive in selected microhabitats with reduced metal availability.
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38

Bishop, Christine A., Suzanne Trudeau, David Janz y Kimberley D. Hughes. "Contaminant concentrations and biomarkers in 21-day old Herring Gulls (Larus argentatus) and Double-crested Cormorants (Phalacrocorax auritus) from eastern Lake Ontario, and from Hamilton Harbour in western Lake Ontario in 1989 and 1990". Aquatic Ecosystem Health & Management 19, n.º 2 (2 de abril de 2016): 181–91. http://dx.doi.org/10.1080/14634988.2016.1150020.

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39

Wolfe, B. B., T. W. D. Edwards y H. C. Duthie. "A 6000-year record of interaction between Hamilton Harbour and Lake Ontario: quantitative assessment of recent hydrologic disturbance using13C in lake sediment cellulose". Aquatic Ecosystem Health & Management 3, n.º 1 (enero de 2000): 47–54. http://dx.doi.org/10.1080/14634980008656990.

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40

Metcalfe, Janice L. y Trefor B. Reynoldson. "Special Section on the Use of Benthic Invertebrates in Environmental Assessment (Proceedings of a Symposium Held at the 31st Conference on Great Lakes Research, McMaster University, Hamilton, Ontario)". Journal of Great Lakes Research 15, n.º 4 (enero de 1989): 537. http://dx.doi.org/10.1016/s0380-1330(89)71509-4.

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41

Wolfe, B. "A 6000-year record of interaction between Hamilton Harbour and Lake Ontario: quantitative assessment of recent hydrologic disturbance using 13C in lake sediment cellulose". Aquatic Ecosystem Health and Management 3, n.º 1 (enero de 2000): 47–54. http://dx.doi.org/10.1016/s1463-4988(99)00065-2.

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42

Visha, Ariola, Alexander Lau, Cindy Yang, Satyendra P. Bhavsar, David Depew, Laud Matos, Felicity Ni y George B. Arhonditsis. "A probabilistic assessment of the impairment status of Areas of Concern in the Laurentian Great Lakes: How far are we from delisting the Hamilton Harbour, Lake Ontario, Canada?" Ecological Informatics 62 (mayo de 2021): 101271. http://dx.doi.org/10.1016/j.ecoinf.2021.101271.

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43

Khan, Izhar U. H., Stephen Hill, Eva Nowak y Thomas A. Edge. "Effect of Incubation Temperature on the Detection of Thermophilic Campylobacter Species from Freshwater Beaches, Nearby Wastewater Effluents, and Bird Fecal Droppings". Applied and Environmental Microbiology 79, n.º 24 (27 de septiembre de 2013): 7639–45. http://dx.doi.org/10.1128/aem.02324-13.

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ABSTRACTThis large-scale study compared incubation temperatures (37°C versus 42°C) to study the detection of thermophilicCampylobacterspecies, includingCampylobacter jejuni,C. coli, andC. lari, in various surface water samples and bird fecal droppings around Hamilton Harbor, Lake Ontario. The putative culture isolates obtained from incubation temperatures of 37 and 42°C were confirmed byCampylobactergenus- and species-specific triplex PCR assays targeting the 16S rRNA gene and the 16S-23S rRNA gene internal transcribed spacer (ITS) region. A total of 759 water, wastewater, and bird fecal dropping samples were tested. Positive amplification reactions for the genusCampylobacterwere found for 454 (60%) samples incubated at 37°C, compared to 258 (34%) samples incubated at 42°C.C. jejuni(16%) andC. lari(12%) were detected significantly more frequently at the 42°C incubation temperature than at 37°C (8% and 5%, respectively). In contrast, significantly higher rates ofC. coli(14%) and otherCampylobacterspp. (36%) were detected at the 37°C incubation temperature than at 42°C (8% and 7%, respectively). These results were consistent across surface water, wastewater, and bird fecal dropping samples. At times,Campylobacterspp. were recovered and detected at 37°C (3% forC. jejuni, 10% forC. coli, and 3% forC. lari) when the same samples incubated at 42°C were negative. A significantly higher rate of otherCampylobacterspp. was detected only at 37°C (32%) than only at 42°C (3%). These results indicate that incubation temperature can significantly influence the culturability and detection of thermophilic and other fastidiousCampylobacterspp. and that a comprehensive characterization of theCampylobacterspp. in surface water, wastewaters, or bird fecal droppings will require incubation at both 37 and 42°C.
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44

Neimanis, Astrida. "Toxic Erotics and Bad Ecosex at Windermere Basin". Environmental Humanities 14, n.º 3 (1 de noviembre de 2022): 699–717. http://dx.doi.org/10.1215/22011919-9962981.

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Abstract How do settler colonialism, control of women’s and differently gendered bodies, sex, industry, pollution—but also pleasure, love, care, desire, bodily autonomy, and survival—cleave together and apart in the inland wetland of Windermere Basin park? Starting with this question, this article explores my own attraction to this tiny place in postindustrial and settler colonial Hamilton, Ontario. I am curious about what it can teach us about the complex entanglements of these things, and the toxic desires that are both enabled and foreclosed by the relations that gather here. In the first section, I briefly rehearse the basin’s toxic history and, guided by Audre Lorde’s definition of erotics and Catriona Sandilands formative work on queer ecologies, my own desirous attachments to the life it nonetheless sustains. The next section reveals how, in the context of settler colonialism and climate catastrophe, these erotics are queerly tangled in questions of more-than-human gender, sex, and reproduction, too, in ways that invite a capacious and multivalent understanding of reproductive justice. The final section examines the performance art of white settler ecosexuals Annie Sprinkle and Beth Stephens, but sets this alongside a performance by Vanessa Dion Fletcher at Windermere, in order to insist on a version of ecosexual erotics that, while joyous, remains imbricated in fraught histories, complicity, and an inalienable attention to what Michif scholar Max Liboiron parses as “differences and obligations.” Taking a cue from settler feminist artist and scholar Lindsay Kelley, I refer to this as “bad ecosex.” In its refusal of purity, bad ecosex holds the trouble of contemporary ecological relations together with the pleasurable power of erotics to build a politics of change grounded in feeling deeply.
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45

Fanaki, Isobel O., Sebastian Irazuzta y Susan A. Dudley. "The native snail shell–nesting bee Osmia conjuncta (Hymenoptera: Megachilidae) exploits a local abundance of exotic Cepaea snails (Stylommatophora: Helicidae), choosing empty shells by size, colour, and microhabitat". Canadian Entomologist 155 (2023). http://dx.doi.org/10.4039/tce.2023.10.

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Abstract For solitary bees, nesting substrate availability may limit population growth. Here, we investigate the nesting of a locally abundant bee Osmia conjuncta Cresson (Hymenoptera: Megachilidae) in empty shells of exotic snails, Cepaea spp. Held (Stylommatophora: Helicidae), in Hamilton, Ontario, Canada. A literature review determined that O. conjuncta was sparsely distributed throughout its range, with a low relative abundance except for the Niagara Region of Ontario, Canada, three sites in Maryland, United States of America, and the focal study area in Hamilton, Ontario. The Hamilton field survey of five grassland bee communities found O. conjuncta to be the most abundant bee species. The average relative abundance was 18.7%, peaking at 87% on one spring day. A survey of 1088 empty snail shells was done at the site with the highest O. conjuncta abundance. It revealed an average of 10.87 empty shells per square metre with cocoons in 9.8% of the shells, averaging 1.6 cocoons per nest. The relation between shell traits and cocoon presence indicated that O. conjuncta preferred nesting in shells with intermediate size and colour and avoided shells near shrubs. The presence of Cepaea snails increased O. conjuncta populations with potential consequences to the local bee assemblage.
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46

Croft-White, Melanie V., Sarah M. Larocque, David T. Reddick, Paul D. Smith, Steven J. Cooke y Jonathan D. Midwood. "Diversity of movement patterns of Longnose Gar tracked in coastal waters of western Lake Ontario". Environmental Biology of Fishes, 30 de noviembre de 2023. http://dx.doi.org/10.1007/s10641-023-01491-1.

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AbstractUnderstanding the spatial ecology of fish is critical for effective conservation and management. Gar (Lepisosteidae spp.) are an ancient lineage of freshwater fishes that have long been thought of as having high site fidelity with limited large-scale movements. We acoustically tagged Longnose Gar (L. osseus) in a large freshwater embayment (Hamilton Harbour) and tracked the movements of 12 individuals within this system and throughout the coastal waters of Lake Ontario for up to 4 years. Three distinct movement patterns were observed: migrants (N = 7), which moved throughout much of western Lake Ontario and had a maximum displacement of 184 km (linear distance); residents (N = 3), which remained in or near the original tagging location (an industrial slip with year-round warmwater outfall); and sporadic migrants (N = 2), which showed both migratory and resident behavioural patterns in different years. Seasonally, gar were most active during the summer and then fall, with more restricted home ranges and movements during winter suggestive of more quiescent behaviour. This study represents the first use of acoustic telemetry to track Longnose Gar movements year-round in a large lake and confirmed that a majority of tracked fishes make large-scale movements in Lake Ontario. Such results reframe the presumption that gar are more resident fishes with restricted space use.
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47

Wells, Mathew G., Jingzhi Li, Bryan Flood, Yulong Kuai, Jill L. Brooks, Steven J. Cooke, Patricia Semcesen y Jonathan D. Midwood. "Speed of sound gradients due to summer thermal stratification can reduce the detection range of acoustic fish tags: results from a field study in Hamilton Harbour, Ontario." Canadian Journal of Fisheries and Aquatic Sciences, 23 de octubre de 2020. http://dx.doi.org/10.1139/cjfas-2020-0078.

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Understanding detection range is a key factor for the use of acoustic telemetry in fisheries research. Lakes have strong seasonal changes in thermal stratification, as well as short-term changes due to internal seiches. These thermal gradients in lakes imply strong sound-speed gradients that can refract and diverge acoustic signals, leading to acoustic attenuation and smaller detection range. Using field-based range testing and the Bellhop acoustic model, we investigated how changes in stratification lead to changes in detection range within Hamilton Harbour, Ontario, Canada. During the summer stratified period, the detection range was less than 350 m, whereas in the isothermal fall, range was up to 500 m. Range test data from three separate field observations showed a good correlation with Bellhop predictions. Due to the intense internal seiches in Hamilton Harbour, the stratification in the shallower littoral regions essentially switched between stratified and isothermal conditions over short timescales, which is predicted to lead to high temporal variability in detection range that must be accounted for during the analysis and interpretation of telemetry derived data.
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48

Reid, Heather Bauer y Anthony Ricciardi. "Ecological responses to elevated water temperatures across invasive populations of the round goby (Neogobius melanostomus) in the Great Lakes basin". Canadian Journal of Fisheries and Aquatic Sciences, 14 de julio de 2021. http://dx.doi.org/10.1139/cjfas-2021-0141.

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Climate warming is expected to alter the distribution, abundance, and impact of non-native species in aquatic ecosystems. In laboratory experiments, we measured the maximum feeding rate and critical thermal maximum (CTmax) of an invasive Eurasian fish, the round goby (Neogobius melanostomus), acclimated to a range of temperatures (18–28°C) reflecting current and projected future thermal conditions for the nearshore Great Lakes. Fish were collected from four distinct populations along a latitudinal gradient from the western basin of Lake Erie to Hamilton Harbour (Lake Ontario) and the upper St. Lawrence River. Thermal tolerance increased with acclimation temperature for populations in lakes Erie and Ontario. However, the St. Lawrence River populations had lower acclimation capacity and exhibited an unexpected decline in CTmax at the highest acclimation temperature. Maximum feeding rates peaked at 18–24°C and declined with temperatures above 24°C. Northern populations in the basin appear poorly adapted to elevated temperatures such that their performance and impact could be reduced by climate warming. Thermal response data from latitudinally distributed populations are needed to inform invasive species risk assessment.
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49

Anyomi, Kenneth A. "How consistent are citizen science data sources, an exploratory study using free automated image recognition apps for woody plant identification". Canadian Journal of Forest Research, 18 de septiembre de 2023. http://dx.doi.org/10.1139/cjfr-2023-0203.

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Rapid advances in artificial intelligence have led to an upsurge in automated image recognition phone apps. This has increased public involvement in the collection, identification (ID) and analysis of biological data. While this is good for the field of biological data monitoring, it is not clear how consistent IDs are from different apps. The goal of this exploratory work is to verify the accuracy and consistency in plant species identification from two widely used and free apps i.e. PlantNet and iNaturalist app. This work was conducted by scanning leaf samples along Bruce trail in the Niagara Escarpment Biosphere reserve and the Royal Botanical Gardens arboretum, in Hamilton Ontario. Results show over 90% consistency in the identification of woody plants at the level of genus. At the species level, PlantNet app demonstrated 79% accuracy (i.e. 79 out of 100 species correctly identified) while the iNaturalist app demonstrated 44% accuracy. Enhancing species representation in the database for southern Ontario might help particularly species in the family Betulaceae, Rosaceae and Pinaceae. Complementary use of the apps is recommended as a cautionary measure to reduce the likelihood of error in species-level woody plant identification as well as using apps in conjunction with field guide.
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50

Molot, Lewis A., David C. Depew, Arthur Zastepa, George B. Arhonditsis, Susan B. Watson y Mark J. Verschoor. "Long-term and seasonal nitrate trends illustrate potential prevention of large cyanobacterial biomass by sediment oxidation in Hamilton Harbour, Lake Ontario". Journal of Great Lakes Research, mayo de 2022. http://dx.doi.org/10.1016/j.jglr.2022.05.014.

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