The Canadian Field-Naturalist (E-Journal)
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"A Field Guide to Insects of the Pacific Northwest" by Robert Cannings, 2018. [book review]
No full text"A Natural History Study of Leech (Annelida: Clitellata: Hirudinida) Distributions in Western North America North of Mexico" by Peter Hovingh, 2016. [book review]
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Minutes of the 139th Annual Business Meeting (ABM) of the Ottawa Field-Naturalists’Club 9 January 2018
Get PDF"The Inner Life of Animals: Love, Grief and Compassion – Surprising Observations of a Hidden World" by Peter Wohlleben, translated from the German by Jane Billingshurst, 2017. [book review]
No full textEffects of Nesting Bald Eagles (Haliaeetus leucocephalus) on Behaviour and Reproductive Rates in a Great Blue Heron (Ardea herodias) Colony in Ontario
Get PDFBald Eagles (Haliaeetus leucocephalus) and Great Blue Herons (Ardea herodias) are known to occasionally nest in mixed colonies, even though the former is one of the primary predators of the latter. I observed the two species in four heron colonies near Lake Simcoe, Ontario during two field seasons to assess whether rates of heron chick mortality or nest abandonment were greater in a colony that supported a nesting pair of Bald Eagles than in three nearby single-species colonies. I assessed the effects of eagle presence on heron behaviour using heron movement rates, the number of heron sentries left in colonies during the nesting period, heron nest mortality rates, and the average number of successfully fledged herons per nest. There was no statistically significant difference in movement rate among the four colonies, proportion of birds remaining as sentries, nor nest mortality rates. However, nests in the mixed colony successfully fledged significantly more heron young per nest than did nests in the single-species colonies. The mixed colony was located in a wetland and open lake system that provided extensive foraging habitat and an abundance of the preferred fish prey species of both Great Blue Herons and Bald Eagles, thus reducing predation pressure on the herons
Reversed Clover, Trifolium resupinatum L. (Fabaceae), Confirmed in Canada
Get PDFWe report two populations of Trifolium resupinatum (Reversed Clover, trèfle résupiné) from southern Ontario, confirming it as established in Canada. This Eurasian and north African species was reported in the late 1800s in New Brunswick and Quebec, where it apparently did not persist. Its distribution across the United States is sporadic
Fabronia ciliaris, a Moss New to Canada from Southeastern Manitoba
Get PDFFabronia ciliaris (Fabroniaceae, Bryophyta) was recently discovered in the Great Lakes–St. Lawrence forest region in southeastern Manitoba. This collection represents the first record of the species in Canada and the northernmost extent of the species in North America
Changes to the Population Status of Horned Grebes (Podiceps auritus) and Red-necked Grebes (Podiceps grisegena) in Southwestern Manitoba, Canada
Get PDFContinental trend data for North America suggest that Horned Grebe (Podiceps auritus) breeding populations are declining and Red-necked Grebe (P. grisegena) populations are increasing. However, data reliability is low due to lack of survey routes in the northern boreal and taiga ecozones, areas encompassing much of the breeding range of both species. Locally in the southern Manitoba prairie ecozone, reliability of long-term trend data is also considered low and these data suggest that Horned Grebe populations are declining faster than the continental trend and that Red-necked Grebe populations are increasing rapidly. The lack of current quantitative information on population densities of these two species in southern Manitoba prompted me to compare 1970s historical data from two sites to recent data collected at the same locations in 2008–2016. I surveyed 42 (1970–1972) and 38 (2008–2016), and 144 (2009–2015) Class III-V wetlands at Erickson and Minnedosa, Manitoba, respectively. Historical Minnedosa data were available from previous field studies. At both locations, Horned Grebe breeding populations have fallen significantly, and Red-necked Grebe populations have risen significantly since the 1970s. The results of this study corroborate the Breeding Bird Survey’s trend data for Horned and Red-necked Grebes in southwestern Manitoba pothole habitat
