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Author: Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Abundance patterns in the small coastal and interior streams were related to the timing of invertebrate life cycles whereas abundance was related to life cycles and the spring freshet in the large rivers. [...] Coefficients of variation were determined for the ordinations of the genus/species, family, and functional data and for the ordination of the environmental variables, that change seasonally. [...] The discharge level achieved and the duration depends on the depth of the snow pack and the speed of melting. [...] The extreme temperatures in the interior increase the rate of weathering of the sedimentary rocks and result in hardwater streams with high alkalinity, high conductivity, and a slightly basic pH (Table 2.1). [...] The Fraser and the Thompson have an intermediate alkalinity, and a conductivity and pH similar to the interior streams (Table 2.1).
Author: Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Abundance patterns in the small coastal and interior streams were related to the timing of invertebrate life cycles whereas abundance was related to life cycles and the spring freshet in the large rivers. [...] Coefficients of variation were determined for the ordinations of the genus/species, family, and functional data and for the ordination of the environmental variables, that change seasonally. [...] The discharge level achieved and the duration depends on the depth of the snow pack and the speed of melting. [...] The extreme temperatures in the interior increase the rate of weathering of the sedimentary rocks and result in hardwater streams with high alkalinity, high conductivity, and a slightly basic pH (Table 2.1). [...] The Fraser and the Thompson have an intermediate alkalinity, and a conductivity and pH similar to the interior streams (Table 2.1).
Author: Vanessa A. Bourne Publisher: ISBN: Category : Languages : en Pages :
Book Description
The vast "Ring of Fire" region, at the interface of the Boreal Shield and Hudson Plains ecozones in the far north of Ontario, Canada, is considered to be one of the most promising mineral exploration areas in Ontario in almost a century. The region is undeveloped and remote, accessible only by air, water or winter road. Multiple stresses to the natural ecosystems are anticipated with mining development, in a time of climate change which is predicted to significantly impact hydrological and temperature regimes (intensified spring freshet, more high discharge events, warmer temperatures for longer). Preserving and protecting the aquatic ecosystems in this pristine region will require effective baseline environmental monitoring in advance of development. Quantifying seasonal variation of habitat characteristics and benthic macroinvertebrate (BMI) communities, and assessing the seasonal difference between ecozones are considered key challenges in designing effective monitoring programs. In this study, I examined seasonal variability in habitat characteristics and BMI communities by sampling 43 stream sites distributed across the two ecozones. In 2015 each site was sampled three times during the open water season: post-freshet, mid-summer and fall. BMI communities varied among sampling seasons, but less variation was observed between the post-freshet and summer sampling periods than either of these compared to the fall. Ordination analyses of BMI communities identified to the family level indicated that sites from the same sampling season were more likely to group together. Water temperature, stream velocity and canopy coverage were the key factors associated with seasonal differences in benthic macroinvertebrates. Differences in location of the sampling sites across the two ecozones did not significantly impact seasonal variability, but differences may have been constrained by the common habitat features used because of the sampling protocol. Conducting sampling during the post-freshet or summer seasons is recommended for future stream bioassessments to reduce the influence of seasonal variability and thus ensure comparability over time.
Author: Publisher: Academic Press ISBN: 0080579493 Category : Technology & Engineering Languages : en Pages : 325
Book Description
Volume 26 of this important series will be of particular interest to fish biologists. Haug's review of Atlantic halibut presents a complete summary of this important species both as a subject of a pelagic fishery and a developing aquaculture industry. Kjorsvik and his colleagues focus on the importance of egg quality for the mass production of fish fry. They point to a number of characters that may be indicative of egg quality and which may help to assess their likelihood of producing good fry.****Neilson and Perry review the studies of diel movements in fish and conclude that they are often facultative in nature. The implications for fish sampling are discussed.****Finally, Burd and Nemec examine the development of practical approaches towards the methods of analyzing benthic infauna, pointing out the assumptions and limitations of each.
Author: Toshio Furota Publisher: ISBN: Category : Columbia River Estuary (Or. and Wash.) Languages : en Pages : 68
Book Description
Macrobenthic invertebrates and sediments at 1 subtidal and 10 intertidal stations along a transect in Baker Bay of the 1ower Columbia River estuary were sampled monthly from November 1980 to October 1981. Water column temperatures and salinities were also recorded at the subtidal station. The intertidal community consisted primarily of estuarine species, whereas the subtidal community had additional marine species. Marine species declined in abundance after the interstitial salinity minimum (June), indicating the important role of salinity in determining benthic community structure. Filamentous algae, tide pools, and eelgrasses (Zostera spp.) were also important factors determining macrobenthic invertebrate community structure. By altering sediment characteristics, Zostera spp. had a positive effect on deposit feeders and a negative effect on the sand-dwelling amphipod Eohaustorius estuaris.
Author: Publisher: ISBN: Category : Entomology Languages : en Pages : 938
Book Description
Monthly, with annual author and subject indexes. Abstracts from about 2750 primary journals dealing with the subject of insects. Arranged in classified order. Entries include titles given or translated into English, authors, addresses offirst authors, and abstracts; all insects cited in the abstracts are identified by scientific family names. Each monthly issue has Index to classes and orders, Author index.
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Author: P. F. Reece
Author: Amy Bruenderman Hill
Author: Vanessa A. Bourne
Author: Darlene Marie Madarish
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Author: Toshio Furota
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