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Increased light reaching streams as a result of riparian vegetation management is often thought to be responsible for enhanced algal productivity. However, concomitant changes in nutrients and other physical processes confound that interpretation. We manipulated light in two separate experiments to test the role of light as a controlling factor for periphyton productivity and biomass, and to observe invertebrate responses in small streams in central British Columbia, Canada. We did this by adding artificial light to reaches of three forested streams, and in a second experiment we used shadecloth to cover reaches of two streams flowing through clearcuts. Periphyton growth, productivity and composition, and macroinvertebrate...
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For 40 years, the Biological Survey of Canada (BSC) has encouraged and organised studies of the arthropod fauna of Canada, through the wide involvement of the scientific community and the leadership of an expert steering committee. The benefits of the BSC to science include the completion of major cooperative projects to acquire and synthesise knowledge (documenting faunas in the Yukon, Canadian grasslands, and other significant regions and habitats), the assembly and organisation of information and specimens, and improved communication among entomologists. Its efforts have led to valuable monographs, scientific briefs, newsletters, and other products summarised here, including documents that are also useful to...
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The distribution patterns of Orthoptera are described for the boreal zone. The boreal fauna of Eurasia includes more than 81 species. Many of them are widely distributed. The monotypic genus Paracyphoderris Storozhenko and at least 13 species are endemics or subendemics. About 50 species are known from boreal North America. Four endemic species are distributed very locally. Relationships between the faunas of the Eurasian and North American parts of the boreal zone are relatively weak. The boreal assemblages are usually characterized by the low levels of species diversity and abundance. Grasshoppers and their relatives occupy almost exclusively open habitats, such as different types of meadows, mountain steppes...
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The aleocharine beetles of the Yukon Territory, Canada are reviewed based on material studied since the most recent survey of the territory in 2008. The present contribution recognizes a fauna of 125 species, of which 9 are new to science, 20 represent new territorial records and one represents a new Canadian record. Seventeen species are considered Holarctic, 6 introduced, and 2 species are of undetermined status (Holarctic or adventive). The Yukon fauna is classified in 32 genera and 8 tribes. The new species are: 1) Acrotona horwoodae Klimaszewski & Godin, sp. n.; 2) Atheta (Microdota) microelytrata Klimaszewski & Godin, sp. n.; 3) Atheta (Microdota) riparia Klimaszewski & Godin, sp. n.; 4) Atheta (Datomicra)...
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Land snails have been investigated isotopically in tropical islands and mid-latitude continental settings, while high-latitude locales, where snails grow only during the summer, have been overlooked. This study presents the first isotopic baseline of live snails from Fairbanks, Alaska (64°51′N), a proxy calibration necessary prior to paleoenvironmental inferences using fossils. δ13C values of the shell (− 10.4 ± 0.4‰) and the body (− 25.5 ± 1.0‰) indicate that snails consumed fresh and decayed C3-plants and fungi. A flux-balance mixing model suggests that specimens differed in metabolic rates, which may complicate paleovegetation inferences. Shell δ18O values (− 10.8 ± 0.4‰) were ~ 4‰ higher than local summer rain...
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During the last two decades a great number of studies dealing witharctic and boreal spiders have been published, both in thePalaearctic and the Nearctic. Such an increase in informationmakes it possible to analyze basic patterns of spider diversity inthe North as well as to show areas where further studies are stillnecessary. The number of species found in faunas of larger areasnorth of 60 degree N varies from 620 (Finland) to 250 (PolarUrals) and 300 (Yukon), when island faunas are excluded. Twoareas, divided by the Bering Strait, Northeastern Siberia andnorth-western North America have marked proportion of endemic taxa(ca. 8 %) belonging to several spider families. Considerablenumber of endemic spiders are known...
map background search result map search result map  Significant westward range extension for the Limnephilid cassisfly Phanocelia Canadensis (Trichoptera): first record from Alaska.  Further contributions to the aleocharine fauna of the Yukon Territory, Canada (Coleoptera, Staphylinidae) Impact of epidermal leaf mining by the aspen leaf miner ( Phyllocnistis populiella) on the growth, physiology, and leaf longevity of quaking aspen Experimental increases and reductions of light to streams: effects on periphyton and macroinvertebrate assemblages in a coniferous forest landscape Lake characteristics and species inventory and distribution for 11 Interior Alaska lakes, 2005-2008 Bioclimatic model of Melanoplus sanguinipes (Fabricius) (Orthoptera: Acrididae) populations in Canada and the potential impacts of climate change Short-Term Demographic Response of the Red-Backed Vole to Spruce Beetle Infestations in Alaska Distribution Patterns of Grasshoppers and Their Kin in the Boreal Zone A revision of the New World species of Gymnoclasiopa Hendel (Diptera, Ephydridae) Stable isotope ecology of land snails from a high-latitude site near Fairbanks, interior Alaska, USA Molecular profiling of soil animal diversity in natural ecosystems: Incongruence of molecular and morphological results Bark-beetle-attacked trees produced more charcoal than unattacked trees during a forest fire on the Kenai Peninsula, Southern Alaska Significant Westward Range Extension For The Limnephilid Caddisfly Phanocelia canadensis (Trichoptera): First Record From Alaska, U.S.A Population dynamics and epidemiology of four species of Dendroctonus (Coleoptera: Curculionidae): 100 years since J.M. Swaine Benefits and principles of the Biological Survey of Canada: a model for scientific cooperation Cryptic subarctic diversity: a new bumblebee species from the Yukon and Alaska (Hymenoptera: Apidae) Molecular profiling of soil animal diversity in natural ecosystems: Incongruence of molecular and morphological results Stable isotope ecology of land snails from a high-latitude site near Fairbanks, interior Alaska, USA Impact of epidermal leaf mining by the aspen leaf miner ( Phyllocnistis populiella) on the growth, physiology, and leaf longevity of quaking aspen Short-Term Demographic Response of the Red-Backed Vole to Spruce Beetle Infestations in Alaska Bark-beetle-attacked trees produced more charcoal than unattacked trees during a forest fire on the Kenai Peninsula, Southern Alaska Lake characteristics and species inventory and distribution for 11 Interior Alaska lakes, 2005-2008  Significant westward range extension for the Limnephilid cassisfly Phanocelia Canadensis (Trichoptera): first record from Alaska.  Significant Westward Range Extension For The Limnephilid Caddisfly Phanocelia canadensis (Trichoptera): First Record From Alaska, U.S.A Cryptic subarctic diversity: a new bumblebee species from the Yukon and Alaska (Hymenoptera: Apidae) Further contributions to the aleocharine fauna of the Yukon Territory, Canada (Coleoptera, Staphylinidae) Bioclimatic model of Melanoplus sanguinipes (Fabricius) (Orthoptera: Acrididae) populations in Canada and the potential impacts of climate change Distribution Patterns of Grasshoppers and Their Kin in the Boreal Zone A revision of the New World species of Gymnoclasiopa Hendel (Diptera, Ephydridae) Population dynamics and epidemiology of four species of Dendroctonus (Coleoptera: Curculionidae): 100 years since J.M. Swaine Benefits and principles of the Biological Survey of Canada: a model for scientific cooperation