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In the mid 1970s, Manitoba Hydro impounded Southern Indian Lake (SIL) and diverted much of the flow of the Churchill River, which flowed through SIL, into the Nelson River Catchment for hydroelectric power generation. A dramatic decline in burrowing mayfly (Hexagenia ) populations following lake man...
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1. The life histories and population dynamics of the burrowing mayflies Hexagenia limbata and H. rigida were examined from 1986 to 1988 in four regions of an impounded lake in northern Manitoba, Canada. 2. Bottom temperatures reached 15-20-degrees-C, but ice-free periods of 4-6 months resulted in an...
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Emerging insects were monitored every 10 days between early May and late August 1993, from tidal pools in three coastal salt marshes on Prince Edward Island, Canada. The salt marsh pools ranged from about 1 m(2) to > 1,000 m(2) in surface area, and had salinities ranging from 11-27parts per thous...
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Egg development was investigated for Hexagenia limbata (Serville) from Southern Indian Lake (SIL) in northern Manitoba, Canada. The SIL population is located near the northern range limit of H. limbata, and some important differences in hatching dynamics were seen in comparison with southern populat...
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We examined the life history and production of the Ephemeroptera, Plecoptera, and Trichoptera (EPT) community along a 500-m stretch of a hydrologically stable cold springbrook in Prince Edward Island during 1997 and 1998. Six mayfly species (Ephemeroptera), 6 stonefly species (Plecoptera), and 11 ca...
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Mature nymphs of Pteronarcys biloba collected from Catamaran Brook, New Brunswick, between October 1994 and October 1995, were hosts to high numbers of parasitic chironomid larvae [Nanocladius (Plecopteracoluthus) undescribed sp., nr, branchicolus]. Nanocladius (P.) sp. has a univoltine life cycle i...
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High levels of azinphos-methyl (0.4-0.8 mu g/L) were detected in the Wilmot River, Prince Edward Island, Canada, following runoff from an agricultural field after a heavy rainfall on 19 July 2002. Benthic macroinvertebrate abundance and diversity were sharply lower in samples collected 1 d after the...
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1. Life history patterns and production of eight shredder-detritivore species were studied in relation to the detritus dynamics of a small acidic stream in England. Mean annual detritus inputs (direct and lateral sources combined) were approximately 400 g m(-2) year(-1) and showed significant season...
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Surveys of benthic invertebrates in subarctic Southern Indian Lake, Manitoba, before and after manipulation of the lake for hydroelectric development, revealed that Hexagenia (Insecta: Ephemeroptera) populations collapsed following the diversion phase. Initial conclusions attributed the collapse to ...
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Nymphs of Pteronarcys biloba Newman and attached chironomid larvae (Nanocladius [Plecopteracoluthus] undescribed sp, nr. branchicolus) were collected from Catamaran Brook, New Brunswick, in May and November 1997 for stable-carbon- and stable-nitrogen-isotope analysis. Nanocladius (P.) sp. had mean (...
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In early July 1991, 234 pitcher plants (Sarracenia pulpurea) were transplanted from a Prince Edward Island bog being mined for peat into three bogs that varied with respect to previous pitcher plant abundance. One bog had a thriving natural pitcher plant population prior to transplant, while the oth...
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Life histories and distribution of mayflies (Insecta:Ephemeroptera) were investigated in 11 streams in south central Ontario that ranged from highly acidic to circumneutral. At least 29 mayfly species were recorded from the streams, with 16 common enough for life history analysis. Mayfly distributio...
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Aquatic fungal colonization dynamics and seasonal patterns were investigated in two sites in Catamaran Brook, New Brunswick, Canada, as part of a larger study to evaluate logging effects on a salmon stream. Four leaf-pack trials were conducted between May 1995 and Dec 1996 to determine species compo...
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Mayflies (Ephemeroptera) were collected from 35 sites (streams and tundra ponds) across southern Nunavut in 2002-2005. Nine mayfly species were previously reported for Nunavut: Acentrella feropagus Alba-Tercedor and McCafferty, Acerpenna pygmaea (Hagen), Baetis bundyae Lehmkuhl, B. flavistriga McDun...
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Predaceous water beetles were collected during expeditions along two northern Canadian rivers during 2000 and 2002. Twelve species of Dytiscidae (including 11 named species and one additional genus identified from a larva) and one species of Gyrinidae are recorded from 20 sites along the Horton and ...
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The importance of microhabitat variables to stream macroinvertebrates can be difficult to assess due to the large number and intercorrelation of relevant environmental variables. In this study, substrate, detritus, and hydraulic variables were evaluated in patches arranged in a grid across a run of ...
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Hexagenia limbata (Serville) and H. rigida McDunnough from Southern Indian Lake, Manitoba, were reared at 10-degrees, 15-degrees, and 20-degrees-C to assess temperature effects on growth. Subsequently, H. limbata was reared at two food levels and two or three nymphal densities (depending on size cla...