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119 results for “Canadian Arctic Archipelago”
Linked collectors and determiners for: Rhamphomyia Meigen of the Canadian Arctic Archipelago, Greenland and Iceland (Diptera: Empididae).
Natural history specimen data linked to collectors and determiners held within, "Rhamphomyia Meigen of the Canadian Arctic Archipelago, Greenland and Iceland (Diptera: Empididae)". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/8e19d5d0-be5e-4022-a16c-b3ce0e554c54">https://bionomia.net/dataset/8e19d5d0-be5e-4022-a16c-b3ce0e554c54</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/8e19d5d0-be5e-4022-a16c-b3ce0e554c54">https://gbif.org/dataset/8e19d5d0-be5e-4022-a16c-b3ce0e554c54</a>. Formatted as a Frictionless Data package.
PAH concentrations in the Fram Strait, the Canadian Arctic Archipelago and the lower Great Lakes
<p>The PEs were deployed at different water depths of deep moorings deployed in the Fram Strait during 2014-2015 (9 samples) and 2018-2019 (22 samples), as well as in surface seawater of the Canadian Arctic Archipelago (6 samples), and in the air (6 samples) and surface water (3 samples) of the lower Great Lakes during 2018-2019. For atmospheric sampling, PEs have deployed at ~1-2 m height and fixed inside two inverted bowls to prevent rainfall and direct solar radiation. For water sampling, PEs were strung on stainless steel wires and attached to stainless steel cages. The surface-water cages were fixed to subsurface floats at ~4-5 m depth, while the deep-water cages were fastened to deep moorings at different depths for ~1 year. PAH concentration data were collected.</p> <p>Supporting information for "Zhang, L., Ma, Y., Vojta, S., Morales-McDevitt, M., Hoppmann, M., Soltwedel, T., et al. (2023). Presence, Sources and Transport of Polycyclic Aromatic Hydrocarbons in the Arctic Ocean. <em>Geophysical Research Letters</em>, 50, e2022GL101496". <a href="https://doi.org/10.1029/2022GL101496">https://doi.org/10.1029/2022GL101496</a></p>
Land cover classification and mapping of a polar desert in the Canadian Arctic Archipelago
<p>The use of remote sensing for developing land cover maps in the Arctic has grown considerably in the last two decades, especially for monitoring the effects of climate change. The main challenge is to link information extracted from satellite imagery to ground covers due to the fine-scale spatial heterogeneity of Arctic ecosystems. There is currently no commonly accepted methodological scheme for high-latitude land cover mapping, but the use of remote sensing in Arctic ecosystem mapping would benefit from a coordinated sharing of lessons learned and best practices. Here, we aimed to produce a highly accurate land cover map of the surroundings of the Canadian Forces Station Alert, a polar desert on the northeastern tip of Ellesmere Island (Nunavut, Canada) by testing different predictors and classifiers. To account for the effect of the bare soil background and water limitations that are omnipresent at these latitudes, we included as predictors soil-adjusted vegetation indices and several hydrological predictors related to waterbodies and snowbanks. We compared the results obtained from an ensemble classifier based on a majority voting algorithm to eight commonly used classifiers. The distance to the nearest snowbank and soil-adjusted indices were the top predictors allowing the discrimination of land cover classes in our study area. The overall accuracy of the classifiers ranged between 75 and 88%, with the ensemble classifier also yielding a high accuracy (85%) and producing less bias than the individual classifiers. Some challenges remained, such as shadows created by boulders and snow covered by soil material. We provide recommendations for further improving classification methodology in the High Arctic, which is important for the monitoring of Arctic ecosystems exposed to ongoing polar amplification.</p>
Land cover classification and mapping of a polar desert in the Canadian Arctic Archipelago
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FIGURE 59. Rhamphomyia setosa Coquillett. A in Rhamphomyia Meigen of the Canadian Arctic Archipelago, Greenland and Iceland (Diptera: Empididae)
FIGURE 59. Rhamphomyia setosa Coquillett. A. hirticula Collin type labels; B. hirticula Collin lectotype, lateral view; C. setosa Coquillett type labels (photograph @ Smithsonian Institute); D. setosa Coquillett lectotype, lateral view (photograph @ Smithsonian Institute).
FIGURE 46 in Rhamphomyia Meigen of the Canadian Arctic Archipelago, Greenland and Iceland (Diptera: Empididae)
FIGURE 46. Rhamphomyia (Pararhamphomyia) simplex Zetterstedt. A. Male hindleg, anterior view; B. Male terminalia, lateral view.
FIGURE 45 in Rhamphomyia Meigen of the Canadian Arctic Archipelago, Greenland and Iceland (Diptera: Empididae)
FIGURE 45. Known distribution of Rhamphomyia (Pararhamphomyia) septentrionalis sp. nov. in North America.
FIGURE 43 in Rhamphomyia Meigen of the Canadian Arctic Archipelago, Greenland and Iceland (Diptera: Empididae)
FIGURE 43. Known distribution of Rhamphomyia (Pararhamphomyia) petervajdai sp. nov. in North America.
FIGURE 41 in Rhamphomyia Meigen of the Canadian Arctic Archipelago, Greenland and Iceland (Diptera: Empididae)
FIGURE 41. Known distribution of Rhamphomyia (Pararhamphomyia) omissinervis Becker in North America.
FIGURE 40 in Rhamphomyia Meigen of the Canadian Arctic Archipelago, Greenland and Iceland (Diptera: Empididae)
FIGURE 40. Rhamphomyia (Pararhamphomyia) omissinervis Becker. A. Male terminalia, lateral view; B. Male hindleg, anterior view C. Lectotype, lateral view; B. Type labels.
FIGURE 38 in Rhamphomyia Meigen of the Canadian Arctic Archipelago, Greenland and Iceland (Diptera: Empididae)
FIGURE 38. Rhamphomyia (Pararhamphomyia) lymaniana sp. nov. A. Male hindleg, anterior view; B. Male abdominal tergite 5, pointing to stout lateral view; C, D. Male terminalia, lateral view.
FIGURE 48 in Rhamphomyia Meigen of the Canadian Arctic Archipelago, Greenland and Iceland (Diptera: Empididae)
FIGURE 48. Rhamphomyia (Pararhamphomyia) ursinella Melander. A. Male terminalia, lateral view; B. Male hindleg, anterior view; C. ursina Malloch holotype, lateral view; D. ursina Malloch type labels.
FIGURE 37 in Rhamphomyia Meigen of the Canadian Arctic Archipelago, Greenland and Iceland (Diptera: Empididae)
FIGURE 37. Known distribution of Rhamphomyia (Pararhamphomyia) kjellmanii Holmgren in North America (arrow indicates localities beyond border of map).
FIGURE 36 in Rhamphomyia Meigen of the Canadian Arctic Archipelago, Greenland and Iceland (Diptera: Empididae)
FIGURE 36. Rhamphomyia (Pararhamphomyia) kjellmanii Holmgren. A. uralensis Becker lectotype, lateral view; B. uralensis Becker type labels; C. Male terminalia, lateral view; D. Male hindleg, anterior view.
FIGURE 35 in Rhamphomyia Meigen of the Canadian Arctic Archipelago, Greenland and Iceland (Diptera: Empididae)
FIGURE 35. Known distribution of Rhamphomyia (Pararhamphomyia) hoeli Frey in North America (arrow indicates localities beyond border of map).
FIGURE 34 in Rhamphomyia Meigen of the Canadian Arctic Archipelago, Greenland and Iceland (Diptera: Empididae)
FIGURE 34. Rhamphomyia (Pararhamphomyia) hoeli Frey. A. Male terminalia, lateral view; B. Male hindleg, anterior view.
FIGURE 44 in Rhamphomyia Meigen of the Canadian Arctic Archipelago, Greenland and Iceland (Diptera: Empididae)
FIGURE 44. Rhamphomyia (Pararhamphomyia) septentrionalis sp. nov. A. Male terminalia, lateral view; B. Male hindlegs; C. Male terminalia, lateral view; D. Female habitus, lateral view.
FIGURE 47 in Rhamphomyia Meigen of the Canadian Arctic Archipelago, Greenland and Iceland (Diptera: Empididae)
FIGURE 47. Known distribution of Rhamphomyia (Pararhamphomyia) simplex Zetterstedt in North America and Iceland.
FIGURE 30 in Rhamphomyia Meigen of the Canadian Arctic Archipelago, Greenland and Iceland (Diptera: Empididae)
FIGURE 30. Rhamphomyia (Pararhamphomyia) hilariformis Frey. A. Lectotype, lateral view [http://id.luomus.fi/GV.5567]; B. Type labels (photographs @ Finnish Museum of Natural History).
FIGURE 31 in Rhamphomyia Meigen of the Canadian Arctic Archipelago, Greenland and Iceland (Diptera: Empididae)
FIGURE 31. Rhamphomyia (Pararhamphomyia) hilariformis Frey. A. Male foreleg; B. Male hindlegs; C. Male terminalia, dorsal view; D, E. Male terminalia, lateral view.
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