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A Comparison Of The Macroinvertebrate Communities In Two Headwater Streams In Advance Of An Invasive Forest Pest
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Book Synopsis A Comparison of the Macroinvertebrate Communities in Two Headwater Streams in Advance of an Invasive Forest Pest by : James J. Willacker (Jr.)
Download or read book A Comparison of the Macroinvertebrate Communities in Two Headwater Streams in Advance of an Invasive Forest Pest written by James J. Willacker (Jr.) and published by . This book was released on 2006 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Relationships Between Headwater Stream Macroinvertebrate Communities and Summer Low-flow Events in a Temperate Rain Forest by :
Download or read book The Relationships Between Headwater Stream Macroinvertebrate Communities and Summer Low-flow Events in a Temperate Rain Forest written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Using a forested headwater stream system as a model, the effects of inter-annual variation in summer discharge regimes on aquatic insect communities were investigated. More specifically, the benthic invertebrate community response to the intensity, minimum discharges, frequency, duration and abruptness of summer low-flow events were examined. We hypothesized that intensification of summer low-flow events, both in duration and magnitude, have some negative impacts on benthic macroinvertebrate communities in riffles. Examples of negative impacts include reduction in their abundance and/or biodiversity. First, the abundance and functional trait data of the benthic macroinvertebrates in the three streams in the Malcolm Knapp Research Forest, British Columbia, Canada, were analyzed with respect to the low-flow events. Second, population models were built to simulate the potential responses of lotic aquatic insect communities to future climate change scenarios that differ in the rate of intensifications in extreme flow events: a low-flow event scenario within the current range versus 10% increase in intensity. The summer low-flow events were found to have a significant relationship with benthic macroinvertebrate communities through three-table ordinations of the empirical data. The community structure was correlated with a major ocean-atmosphere regime shift (Pacific Decadal Oscillation). The intensity and duration of low-flow events explained the observed shift in community structure favouring r-selected traits (e.g. short life cycle, high reproduction rate). The two low-flow severity scenarios showed the significant differential impacts on the aquatic insect community structures when individual populations were modeled according to their traits. Aquatic insects could be separated into three groups according to their sensitivities, measured by extinction rates, toward the two scenarios.
Book Synopsis Habitat Comparisons of Macroinvertebrate Community Structures in Headwater Streams of the Northern Jarrah Forest by :
Download or read book Habitat Comparisons of Macroinvertebrate Community Structures in Headwater Streams of the Northern Jarrah Forest written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Comparison of Benthic Macroinvertebrate Communities in Forested Streams and Streams Adjacent to Cornfields and Dairy Pastures in Addison and Chittenden Counties, Vermont, USA by : Sofia Alexandra Kyriakeas
Download or read book A Comparison of Benthic Macroinvertebrate Communities in Forested Streams and Streams Adjacent to Cornfields and Dairy Pastures in Addison and Chittenden Counties, Vermont, USA written by Sofia Alexandra Kyriakeas and published by . This book was released on 2001 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Macroinvertebrate Community Structure and Feeding Dynamics in Three Forested Headwater Streams in Central Maine by : Emily R. Arsenault
Download or read book Macroinvertebrate Community Structure and Feeding Dynamics in Three Forested Headwater Streams in Central Maine written by Emily R. Arsenault and published by . This book was released on 2014 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: Headwater streams have some of the best quality water in the country (Dissmeyer 2000). Because headwaters eventually flow into other downstream water bodies like rivers and lakes, they are important places to focus research and conservation efforts. All streams in this study had good water quality based on several assessments of macroinvertebrate communities. 1. Judging from metrics of abundance, richness, EPT, and HBI, all study streams had very good water quality. Thirty-nine total families were observed among the three streams. Whittier Stream was the least healthy of the three, most likely as a result of human disturbances such as a road crossing, fishpond, and mill remnants. It is probable these habitat alterations are having an effect on downstream benthic communities. 2. The riparian zone of each stream was forested and stable, but there were some eroding banks at some points along the study reaches. The abundance of sensitive macroinvertebrates (measured using representative Orders Ephemeroptera, Plecoptera, and Trichoptera) increased with increasing percent canopy cover and decreased with high percentages of sand characterizing the streambed. 3. Macroinvertebrates can be categorized into functional feeding groups based on feeding behavior. Shredders should hypothetically be in high abundance in headwater streams due to high riparian organic matter inputs. However, observed shredders were limited. This may be due to seasonal changes in functional feeding group ratios. In addition, all study streams had a predator/prey ratio that was higher than the ratio expected for a typical stream, which suggests that there might be an abundance of prey biomass in the study stream headwaters. 4. Based on results from stable isotope analysis of carbon and nitrogen, most macroinvertebrates within the study streams seem to be omnivorous. The most complex food web was observed at Stony Brook. Food webs of Beaver Brook and Stony Brook showed similar trophic clustering, a pattern that might be indicative of streams with excellent water quality.
Book Synopsis Aquatic Macroinvertebrate Communities in Two Agriculturally Impacted Streams in Northern Virginia and an Evaluation of Fencing as a Best Management Practice by : Ryan A. Hansen
Download or read book Aquatic Macroinvertebrate Communities in Two Agriculturally Impacted Streams in Northern Virginia and an Evaluation of Fencing as a Best Management Practice written by Ryan A. Hansen and published by . This book was released on 2003 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Structural and Functional Characteristics of the Benthic and Hyporheic Macroinvertebrate Communities in Two Alabama Headwater Streams with Emphasis on the Chironomidae (Diptera) by : Steven Kelsey Reynolds
Download or read book The Structural and Functional Characteristics of the Benthic and Hyporheic Macroinvertebrate Communities in Two Alabama Headwater Streams with Emphasis on the Chironomidae (Diptera) written by Steven Kelsey Reynolds and published by . This book was released on 2002 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Macroinvertebrate Communities in Headwater Prairie Streams by : Brandy Sue Bergthold
Download or read book Macroinvertebrate Communities in Headwater Prairie Streams written by Brandy Sue Bergthold and published by . This book was released on 2001 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comparison of Epiphytic Macroinvertebrate Communities Associated with an Invasive Aquatic Plant (Trapa Natans L.) and Its Native Competitor (Nymphaea Odorata Aiton) by : Phillip M. Barber
Download or read book Comparison of Epiphytic Macroinvertebrate Communities Associated with an Invasive Aquatic Plant (Trapa Natans L.) and Its Native Competitor (Nymphaea Odorata Aiton) written by Phillip M. Barber and published by . This book was released on 2010 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Patterns and Determinants of Macroinvertebrate Diversity in Headwater Stream Networks by : Amber Clarke
Download or read book Patterns and Determinants of Macroinvertebrate Diversity in Headwater Stream Networks written by Amber Clarke and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Headwater streams dominate stream channel length in catchments. They are important sources of water, sediment and biota for downstream reaches and critical sites for organic matter and nutrient processing. Aquatic biodiversity in headwater streams has been overlooked in comparison to higher-order rivers, and few studies have considered spatial biodiversity patterns in headwater streams, or streams in general. I reviewed studies of macroinvertebrate diversity in headwater streams and found equivocal evidence to support the view that headwater streams harbour high biodiversity. Headwater streams might still make an important contribution to [gamma] (regional) diversity at the landscape (catchment) scale by virtue of high [beta] (among-assemblage) diversity. I studied eight headwater streams from three forested, upland catchments along the Great Dividing Range, Victoria, Australia to test my hypothesis of high [beta] diversity and to understand the spatial patterns and determinants of macroinvertebrate diversity in headwater stream networks.Diversity partitioning showed that reaches each had high [alpha] (within-assemblage) diversity, while [beta] diversity made only a small contribution to [gamma] diversity at both the reach and catchment scales. [beta] diversity may have been lower than hypothesized due to relatively small distances between sites and high levels of dispersal among reaches and catchments in the study area. Contrary to other studies that have found environmental factors to be important for explaining variation in macroinvertebrate assemblage structure in headwater streams, I found a limited role for environmental factors structuring macroinvertebrate assemblages in the study area.In one year (2008), spatial factors (independent of environmental factors) were the dominant factor structuring macroinvertebrate assemblages. Therefore, metacommunity structure in the study area aligns most closely with the neutral/patch dynamic metacommunity model. This pattern of spatial structuring, coupled with low [beta] diversity, suggests that high neighbourhood dispersal might be the main factor structuring macroinvertebrate assemblages in the study area. Flow permanence had only a seasonal effect on macroinvertebrate diversity and so there is a temporal component to the spatial diversity patterns in this system.The explicit recognition of stream ecosystems as spatially structured networks has increased our understanding of ecological patterns and processes, and provided the impetus for this research. Recent advances in the study of networks, particularly in the fields of physics and network theory, offer an opportunity to considerably extend the current application of the network concept in stream ecology.Determining the relative contributions of [alpha] and [beta] diversity to [gamma] diversity, and the scale dependence of [alpha] and [beta] components, provides vital information for conservation planning because optimal reserve designs will differ depending on the relative contributions of [alpha] and [beta] diversity. My finding of high [alpha] and low [beta] diversity indicates that each stream in the study area can be considered to have low irreplaceability and the capacity to contribute a large portion of species to regional conservation targets.Information on spatial patterns of diversity is urgently required for systematic conservation planning for freshwater reserves if we are to halt the rapid decline in global freshwater biodiversity.
Book Synopsis Impacts of Urbanization and Flow Permanence on Headwater Stream Macroinvertebrates (Hamilton County, Ohio) by : Hannah R. Lubbers
Download or read book Impacts of Urbanization and Flow Permanence on Headwater Stream Macroinvertebrates (Hamilton County, Ohio) written by Hannah R. Lubbers and published by . This book was released on 2009 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt: Through extensive research, stream ecologists have continuously strengthened their understanding of the importance of headwater streams and watersheds in stream health. Contrarily, United States policy makers have reversed such progress by reducing protection of many headwater streams. These contrasting trends have contributed to recent research in temporary headwater stream systems and the role that these streams have in the greater stream network. Despite numerous studies, researchers have not found consistent differences in macroinvertebrate assemblages between intermittent and perennial streams. Additionally, there is limited knowledge on how anthropogenic factors influence headwater streams that are naturally disturbed by drying. The objective of this study was to determine how urbanization interacts with stream permanence to shape headwater stream macroinvertebrate assemblages and salamander communities in Southwest Ohio. During spring (high flows) and summer (low flows) of 2007, we examined 20 intermittent and perennial reaches in ten streams along a gradient of watershed urbanization (range: 9 - 97% urban land cover). Macroinvertebrate richness ranged from 5-33 genera across all reaches, and the most abundant taxa were, in descending order, Oligochaeta, Lirceus fontinalus (freshwater Isopoda), and Chironomus spp. Urban land cover, temperature, nitrates, and substrate heterogeneity may have been important in structuring macroinvertebrate assemblages based on their strong correlations with the ordination axes. Duration of flow (permanence) did not explain differences in macroinvertebrates across sites based on the ordination. However, flow permanence was positively related to spring Chironomidae abundances (R^2 = 0.11, P
Book Synopsis Macroinvertebrate Communities in Four Ouachita Mountain Headwater Streams by : Robert Kipling Heth
Download or read book Macroinvertebrate Communities in Four Ouachita Mountain Headwater Streams written by Robert Kipling Heth and published by . This book was released on 2006 with total page 970 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Comparison of Macroinvertebrate Communities on Bedrock and Other Substrates in a North Shore Stream by : Gary Douglas Olson
Download or read book A Comparison of Macroinvertebrate Communities on Bedrock and Other Substrates in a North Shore Stream written by Gary Douglas Olson and published by . This book was released on 1982 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Macroinvertebrate Distribution and Production on the Floodplains of Two Lowland Headwater Streams by : James Evan Gladden
Download or read book Macroinvertebrate Distribution and Production on the Floodplains of Two Lowland Headwater Streams written by James Evan Gladden and published by . This book was released on 1989 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Refining Aquatic Macroinvertebrate Community Metrics for the Assessment of Headwater Streams in New York State by : Brian T. Duffy
Download or read book Refining Aquatic Macroinvertebrate Community Metrics for the Assessment of Headwater Streams in New York State written by Brian T. Duffy and published by . This book was released on 2014 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Influence of Discharge and Temperature Variation on Macroinvertebrate Community Diversity Patterns in Headwater Streams by : Braden O. Burkholder
Download or read book The Influence of Discharge and Temperature Variation on Macroinvertebrate Community Diversity Patterns in Headwater Streams written by Braden O. Burkholder and published by . This book was released on 2004 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Macroinvertebrate Community Structure of Headwater Streams of the Buffalo National River, Arkansas, in Relation to Physicochemical Environmental Variables by : Carl Willard Dick
Download or read book Macroinvertebrate Community Structure of Headwater Streams of the Buffalo National River, Arkansas, in Relation to Physicochemical Environmental Variables written by Carl Willard Dick and published by . This book was released on 1998 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
