Download or read book Benthic Macroinvertebrate Community Composition and Distribution Related to Seasonal and Geochemical Changes in a Chronically Acidified Stream written by Darlene Marie Madarish and published by . This book was released on 1997 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Relating Benthic Macroinvertebrate Community Composition and Habitat Complexity written by Scott C. Fetherston and published by . This book was released on 1994 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Acidic Deposition on Aquatic Ecosystems in Pennsylvania written by William E. Sharpe and published by . This book was released on 1999 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determining the Benthic Macroinvertebrate Community Composition of Freshwater Streams from Fish Gut Analysis written by Shelly Pickett and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The monitoring of changes in benthic macroinvertebrate communities over time facilitates the evaluation of changes in the function and structure of aquatic ecosystems. I hypothesize that it will be possible to reconstruct historic macroinvertebrate communities by examining gut contents of fishes preserved in natural history museums. Researchers can use this knowledge to estimate the historic benthic macroinvertebrate community for streams from which we have fish museum specimens. These historic data can then be compared to current data to see how macroinvertebrate communities have changed over time.In this study, the fishes whose gut content most accurately reflected the benthic macroinvertebrate community of a freshwater stream, specifically Marshalls Creek, were identified. Both fish species and benthic macroinvertebrates were collected at various sites of Marshalls Creek in East Stroudsburg, PA, in March, August, and December 2010. Collections were taken at different times of year to reflect seasonal variation both in species sampled and quantity collected. 231 fish were dissected and their gut contents identified. Bluespotted Sunfish, Redbreast Sunfish, and White Suckers were the species that best represented the benthic macroinvertebrate community from their gut content. These species can be used to predict 81% of the total summer taxa.If there are 10 museum specimens of the selected species available, (in this case 10 White Suckers, 10 Bluespotted Sunfish, and 10 Redbreast Sunfish), one could dissect a total of 30 fish and expect to identify 68% of the total taxa (both kicknet and gut taxa combined) found in the freshwater stream where the specimens originated.In order to estimate sampling distribution, using R 3.0.2, 100 simulations were run of each combination of three fish species to determine the average quantity of taxa consumed (to the family level) along with sampling variation. The benthic macroinvertebrate data obtained fromivthe dissection of museum specimens could then be compared to data obtained from more recently collected specimens (10 White Suckers, 10 Bluespotted Sunfish, and 10 Redbreast Sunfish) and a comparison made to determine how the macroinvertebrate community has changed over time. Are families associated with high quality streams missing from the current collection? Based on which macroinvertebrate families are present and/or absent, the types of stresses that have caused these absences can be determined.
Download or read book Seasonal Changes in a Benthic Macroinvertebrate Community of a North Cascades Mountain Stream written by Amy Bruenderman Hill and published by . This book was released on 1998 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structure and Size Distribution of Benthic Macroinvertebrate Communities Along a Eutrophication Gradient in Streams of the Ottawa Valley written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Macroinvertebrate Community Structure and Function in Seasonal Low land Tropical Streams Across a Pristine rural Urban Land use Gradient written by Julie Elizabeth Helson and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Macroinvertebrate Community Composition in Stream Networks Across Three Land Cover Types written by Raj Kiran Parmar and published by . This book was released on 2018 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Land cover change strongly affects biodiversity in stream ecosystems, with several studies demonstrating the negative impacts of agricultural and urban expansion on local community richness. However, little is known of the effects of land cover on the variation among sets of local communities in stream networks, as well as the drivers of community variation in these systems. Using the metacommunity framework, this study takes a multi-scale approach to understand how macroinvertebrate communities are assembled across three catchment land cover types; native forest, agricultural and urban. Specifically, the aims of this study are to assess; (1) how stream network land cover influences alpha and beta diversity of macroinvertebrate communities and, (2) the relative role of local environmental conditions and spatial dispersal variables in structuring these communities. Benthic macroinvertebrate samples and local in-stream and riparian environmental variables were collected at 20 sampling sites in each of the six study stream networks in Auckland. Spatial distance proxies of macroinvertebrate dispersal in stream networks were calculated using geospatial techniques. Community alpha and beta diversity, environmental and distance variables were analysed using multivariate statistical techniques. Comparisons showed reference forest and impacted (agricultural and urban) networks supported distinct communities, with lower alpha diversity in the impacted stream networks. Unexpectedly, beta diversity in the impacted networks was greater than, or equal to the reference stream networks, with community dissimilarity almost entirely driven by species turnover. Overall, irrespective of land cover, macroinvertebrate communities were largely structured by local environmental conditions. Benthic substrate and the presence and composition of riparian vegetation were the most significant local environmental variables influencing community composition. Spatial dispersal limitation variables had a small, but significant, effect on inter-site community dissimilarity and overall community structure in each catchment. Network distance between local communities explained the greatest variation in community dissimilarity of the three distance types. This study identified potential drivers of macroinvertebrate community variation in Auckland streams, specifically highlighting the relative role of local environmental and spatial dispersal processes. The results of this study have relevance for biomonitoring and state of environment reporting of Auckland’s freshwater systems, as well as future stream rehabilitation projects.
Download or read book Spatial and Temporal Variability of Stream Benthic Macroinvertebrates written by Leonard Sandin and published by . This book was released on 2000 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Long term Spatial and Temporal Variability of Benthic Macroinvertebrate Communities written by Eve Elizabeth O'Connor and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The structure and composition of benthic macroinvertebrate communities can vary spatially and over time. Spatial and temporal variation along a stream has many implications for population and community dynamics, which may influence bioassessment programs. I examined variability in the benthic community of eight streams within the Polecat Creek, Virginia watershed. These streams vary in size from 1st to 4th order. The streams were sampled once every season for eleven years using standard bioassessment protocols. Macroinvertebrates were sampled from both sediment and submerged wood habitats at each site. The coefficient of variation (CV) was used to quantify among season, among year and among site variability of eight community metrics from both the sediment and wood samples. ANOVAs were calculated using Tukey post-hoc test to determine if there were statistically significant differences in taxonomic richness and mean CV values across seasons, years and sites for both sediment and wood samples. Sorenson's Quotient of Similarity was used to examine the extent of differences in the taxonomic composition of the macroinvertebrate communities among the four seasons over the 11 years of the study and among the 8 sampling sites. A high amount of variability was observed among seasons, sites and years. A wide range of CV values was observed among community metrics, with certain metrics exhibiting low overall mean CV values and others exhibiting very high overall mean CV values. It is important to understand the temporal and spatial variability of macroinvertebrates when planning biomonitoring programs.
Download or read book Biomonitoring Under Changing Climate Conditions written by Vanessa A. Bourne and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Longitudinal Changes in Stream Benthic Macroinvertebrate Community Trophic Structure Along Two Central Texas Headwater River Continua written by Brian Richard Creutzburg and published by . This book was released on 2000 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Changes in Benthic Macroinvertebrate Community Structure in Acid and Metal contaminated Lakes Following Water Quality Improvements written by Jennifer A. Reasbeck and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Benthic Macroinvertebrate Community Structure in Relation to Water Quality and Habitat in the Upper Pecos River Texas written by Greg L. Larson and published by . This book was released on 1996 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Changes in Benthic Macroinvertebrate Community Structure in Acid and Metal contaminated Lakes Following Water Quality Improvements written by and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Seasonal Changes of Benthic Macroinvertebrate Communities in Southwestern British Columbia written by and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Download or read book Relationships of Benthic Macroinvertebrate Community Structure with Land use Habitat In stream Water Chemistry Depositional Sediment Biofilm Fatty Acids and Surfactants in the Effluent Dominated Texas Trinity River written by Jaime L. Slye and published by . This book was released on 2013 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt:
