Physiographic regions of Canada

Bostock, H S

doi:10.4095/293408

Cited by 19 publications

(14 citation statements)

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“…For these, we considered the breeding season to be from 11 May to 31 August, migration from 1 September to 30 November and from 10 March to 10 May, and the non‐breeding period from 1 December to 9 March. We also used physiographic regions rather than terrestrial ecoregions or other major ecotype designations following Fenneman (1928) and Bostock (1967). Fenneman’s (1928) Interior Plains correspond to the Great Plains and northern expanses of the Mississippi River Basin, whereas the Laurentian Upland is aligned with the eastern portion of Canada’s boreal forest (Bostock 1967).…”

Section: Methodsmentioning

confidence: 99%

Accipiterhawks of the Laurentian Upland and the Interior Plains undertake the longest migrations: insights from birds banded or recovered in Veracruz, Mexico

2020

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Bird banding has allowed us to understand diverse aspects of the life histories of migratory raptors. However, most banding stations are located at northern latitudes so what we know about the movements of these raptors is biased toward higher latitudes, primarily from Canada and the United States, leaving important gaps in our knowledge of their movements at lower latitudes. Our objective was to describe the migratory movements of Sharp‐shinned (Accipiter striatus) and Cooper’s (A. cooperii) hawks based on banding and recapture records of birds that migrate through Veracruz, Mexico. More specifically, we sought to determine their breeding, migration, and non‐breeding locations, estimate their migration distances, and contribute to a better understanding of their migration patterns. With a total of 80 records, we calculated migration distances and used Kernel Density Estimation analyses to identify where these hawks were recaptured or recovered by season. The distribution of recaptures and recoveries largely coincided with breeding locations in the Laurentian Upland and the Interior Plains physiographic regions. All migration records follow a trajectory that extends from the midwestern United States to the Gulf coastal plain of Mexico. The mean breeding season migration distance to Veracruz was 3374 km (a difference of 27 degrees of latitude) for Sharp‐shinned Hawks and 2926 km (a difference of 25 degrees of latitude) for Cooper’s Hawks. Our non‐breeding records indicate that populations of Accipiter hawks from these North American populations migrate the longest distances to reach Central America, the southernmost distribution of their migratory populations. Distances covered by both species represent round‐trip migrations that may be as long as 10,000 km. Our results support those of previous studies and illustrate how continental physiography influences the migration routes, migratory behavior, and migratory connectivity of these hawks.

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Section: Methodsmentioning

confidence: 99%

Accipiterhawks of the Laurentian Upland and the Interior Plains undertake the longest migrations: insights from birds banded or recovered in Veracruz, Mexico

2020

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“…Mean annual precipitation varies according to a west–east gradient (1010–1127 mm). Geology consists of a core of old, massive Precambrian crystalline rocks (Laurentian and James Shield Regions; Bostock ). Surficial deposits are dominated by glacial, fluvial–glacial, and marine materials (Robitaille and Saucier ).…”

Section: Methodsmentioning

confidence: 99%

Ecological gradients driving the distribution of four Ericaceae in boreal Quebec, Canada

Thiffault

Grondin

Noël

et al. 2015

Ecology and Evolution

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Understory species play a significant role in forest ecosystem dynamics. As such, species of the Ericaceae family have a major effect on the regeneration of tree species in boreal ecosystems. It is thus imperative to understand the ecological gradients controlling their distribution and abundance, so that their impacts can be taken into account in sustainable forest management. Using innovative analytical techniques from landscape ecology, we aimed to position, along ecological gradients, four Ericaceae found in the boreal forest of Quebec (Canada) (Rhododendron groenlandicum, Kalmia angustifolia, Chamaedaphne calyculata, and Vaccinium spp), to regionalize these species into landscape units relevant to forest management, and to estimate the relative importance of several ecological drivers (climate, disturbances, stand attributes, and physical environment) that control the species distribution and abundance. We conducted our study in boreal Quebec, over a study area covering 535,355 km2. We used data from 15,339 ecological survey plots and forest maps to characterize 1422 ecological districts covering the study region. We evaluated the relative proportion of each ericaceous species and explanatory variables at the district level. Vegetation and explanatory variables matrices were used to conduct redundancy, cluster, and variation partitioning analyses. We observed that ericaceous species are mainly distributed in the western part of the study area and each species has a distinct latitudinal and longitudinal gradient distribution. On the basis of these gradients, we delimited 10 homogeneous landscape units distinct in terms of ericaceous species abundance and environmental drivers. The distribution of the ericaceous species along ecological gradients is closely related to the overlaps between the four sets of explanatory variables considered. We conclude that the studied Ericaceae occupy specific positions along ecological gradients and possess a specific abundance and distribution controlled by the integration of multiple explanatory variables.

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“…The deposit is just southeast of Lac Brisson approximately 240 km northeast of Schefferville, Quebec, and 125 km west of the world class Voisey's Bay Ni-Cu-Co mine in Labrador. The area is north of the tree line in the zone of discontinuous permafrost (Heginbottom et al 1995) and is situated within the George Plateau physiographic region of the Canadian Shield (Bostock 2014). A large lake 15 km to the northeast of the deposit was informally named Strange Lake after the discovery of the intrusive complex.…”

Section: Location and Accessmentioning

confidence: 99%

Rare metal indicator minerals in bedrock and till at the Strange Lake peralkaline complex, Quebec and Labrador, Canada

McClenaghan

Paulen

Kjarsgaard³

2019

Can. J. Earth Sci.

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A study of rare metal indicator minerals and glacial dispersal was carried out at the Strange Lake Zr – Y – heavy rare earth element deposit in northern Quebec and Labrador, Canada. The heavy mineral (>3.2 specific gravity) and mid-density (3.0–3.2 specific gravity) nonferromagnetic fractions of mineralized bedrock from the deposit and till up to 50 km down ice of the deposit were examined to determine the potential of using rare earth element and high fileld strength element indicator minerals for exploration. The deposit contains oxide, silicate, phosphate, and carbonate indicator minerals, some of which (cerianite, uraninite, fluorapatite, rhabdophane, thorianite, danburite, and aeschynite) have not been reported in previous bedrock studies of Strange Lake. Indicator minerals that could be useful in the exploration for similar deposits include Zr silicates (zircon, secondary gittinsite (CaZrSi2O7), and other hydrated Zr±Y±Ca silicates), pyrochlore ((Na,Ca)2Nb2O6(OH,F)), and thorite (Th(SiO4))/thorianite (ThO2) as well as rare earth element minerals monazite ((La,Ce,Y,Th)PO4), chevkinite ((Ce,La,Ca,Th)4(Fe,Mg)2(Ti,Fe)3Si4O22), parisite (Ca(Ce,La)2(CO3)3F2), bastnaesite (Ce(CO3)F), kainosite (Ca2(Y,Ce)2Si4O12(CO3)·H2O), and allanite ((Ce,Ca,Y)2(Al,Fe)3(SiO4)3(OH)). Rare metal indicator minerals can be added to the expanding list of indicator minerals that can be recovered from surficial sediments and used to explore for a broad range of deposit types and commodities that already include diamonds and precious, base, and strategic metals.

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Physiographic regions of Canada

Cited by 19 publications

References 0 publications

Accipiterhawks of the Laurentian Upland and the Interior Plains undertake the longest migrations: insights from birds banded or recovered in Veracruz, Mexico

Accipiterhawks of the Laurentian Upland and the Interior Plains undertake the longest migrations: insights from birds banded or recovered in Veracruz, Mexico

Ecological gradients driving the distribution of four Ericaceae in boreal Quebec, Canada

Rare metal indicator minerals in bedrock and till at the Strange Lake peralkaline complex, Quebec and Labrador, Canada

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