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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...
ABSTRACT Six new aleocharine species are described and illustrated from the Yukon and Alaska: Atheta (Dimetrota) cadeti Klimaszewski and Godin, sp. nov.; Atheta (Hypatheta) pseudomet lakatlana Klimaszewski and Godin, sp. nov.; Cypha inexpectata Klimaszewski and Godin, sp. nov.; Oxypoda yukonensis Klimaszewski and Godin, sp. nov., Oxypoda pseudoconvergens Klimaszewski and Godin, sp. nov.; and Clusiota antennalis Klimaszewski and Godin, sp. nov. Atheta (Rhagocneme) subsinuata (Erichson), known from the western Palaearctic region, was discovered in the Yukon and is reported in North America for the first time as an adventive species. Amischa tersa Casey is recorded from Canada and the Yukon for the first time. Twenty-four...
Intensification of permafrost thaw has increased the frequency and magnitude of large permafrost slope disturbances (mega slumps) in glaciogenic terrain of northwestern Canada. Individual thermokarst disturbances up to 40 ha in area have made large volumes of previously frozen, highly weatherable fine-grained sediments available for leaching and transport to adjacent streams, significantly increasing sediment and solute loads in these systems. To test the effects of this climate-sensitive disturbance regime on the ecology of Arctic streams, we explored the relationship between physical and chemical variables and benthic macroinvertebrate communities in disturbed and undisturbed stream reaches in the Peel Plateau...
Biological invasions are one of the greatest threats to native species in natural ecological systems. One of the most successful invasive species is Bromus tectorum L. (cheatgrass), which is having marked impacts on native plant communities and ecosystem processes. However, we know little about the effects of this invasion on native animal species in the Intermountain West. Because ants have been used to detect ecological change associated with anthropogenic land use, they seem well suited for a preliminary evaluation of the consequences of cheatgrass-driven habitat conversion. In our study, we used pitfall traps to assess ant community assemblages in intact sagebrush and nearby cheatgrass-dominated vegetation....
RÉSUMÉ. Les mollusques d'eau douce constituent une partie imposante du régime alimentaire du corégone à bosse (Coregonus pidschian) et du corégone tschir (C. nasus), deux corégonidés à alimentation benthique. L'analyse récente de pisidies (Sphaeriidae), de valvatidés (Valvatidae) et de lymnéidés (Lymnaeidae) provenant du tractus digestif inférieur de ces poissons a permis de constater que grand nombre de ces mollusques étaient toujours en vie. Le fait d'avoir entièrement survécu dans le passage digestif porterait à croire qu'il s'agirait là d'un mécanisme de dispersion des mollusques d'eau douce qui n'a jamais encore été reconnu. Une étude sur le terrain a été réalisée au moyen de corégones à bosse et de corégones...
Introduction: ... As a directed effort to further document moths of limited geographic occurrence, an initial inventory of the southwestern Yukon was conducted in 2004. Survey efforts focused on habitats known to harbor species of limited occurrence, particularly sand dunes and low elevation grasslands / steppe. Alpine tundra was also surveyed, but to a lesser extent owing to the fact that many of the Beringian endemic species have a biennial life cycle and fly only in odd-numbered years (Lafontaine & Wood 1997). Although Yukon's boreal habitats are undoubtedly home to many species not yet documented from this territory, the boreal fauna is generally transcontinental in distribution, and survey work was not explicitly...
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...
Dendroctonus ponderosae (Hopkins) or mountain pine beetle is a native bark beetle (Coleoptera: Curculionidae: Scolytinae) that feeds on more than 20 species of pine in western North America. In British Columbia, its principal host is lodgepole pine (Pinus contorta var. latifolia Engelmann). As a "primary" bark beetle, D. ponderosae kills its host at epidemic stages, exerting profound landscape-level mortality. As of 2012, D. ponderosae has caused the loss of 726 million cubic meters of timber, covering an area of 17.5 million hectares of mature pine forest in British Columbia and Alberta. Small diameter hosts are not suitable for D. ponderosae , however, creating a niche for the "secondary" bark beetles, including...
map background search result map search result map  Significant westward range extension for the Limnephilid cassisfly Phanocelia Canadensis (Trichoptera): first record from Alaska.  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 Distribution Patterns of Grasshoppers and Their Kin in the Boreal Zone Molecular profiling of soil animal diversity in natural ecosystems: Incongruence of molecular and morphological results 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 Molecular profiling of soil animal diversity in natural ecosystems: Incongruence of molecular and morphological results 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 Distribution Patterns of Grasshoppers and Their Kin in the Boreal Zone 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