Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Taxonomic Diversity Assemblage Structure And Biotic Integrety Of Benthic Macroinvertebrates In The Guadalupe San Marcos River System
Download Taxonomic Diversity Assemblage Structure And Biotic Integrety Of Benthic Macroinvertebrates In The Guadalupe San Marcos River System full books in PDF, epub, and Kindle. Read online Taxonomic Diversity Assemblage Structure And Biotic Integrety Of Benthic Macroinvertebrates In The Guadalupe San Marcos River System ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Taxonomic Diversity, Assemblage Structure, and Biotic Integrety of Benthic Macroinvertebrates in the Guadalupe-San Marcos River System by : C. Lexi Smith
Download or read book Taxonomic Diversity, Assemblage Structure, and Biotic Integrety of Benthic Macroinvertebrates in the Guadalupe-San Marcos River System written by C. Lexi Smith and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Freshwater ecosystems are historically known to support a wide range of biodiversity at various trophic levels. However, the loss of freshwater biodiversity is related to trends in deteriorating water quality caused by anthropogenic disturbances that negatively impact bioindicator communities (e.g., benthic macroinvertebrates; BMI). I incorporated parameters of the Texas Commission of Environmental Quality (TCEQ) Rapid Bioassessment Protocols (RBP) to assess taxonomic diversity, assemblage structure, and biotic integrity of BMI in the Guadalupe – San Marcos River System (GSMR) in Texas. I sampled 25,512 BMI from 44 sites of the GSMR within various sampling methods, regions, habitats, and substrates. Taxonomic diversity and assemblage structure of BMI appeared to be homogenous across the river system regardless of sampling method, habitat, and substrate. However, regions suggested the San Marcos River of having the highest alpha diversity, lowest beta diversity, and greatest biotic integrity compared to the observed anthropogenic disturbance of the Guadalupe River overall. My study emphasizes the need for improved efforts towards large river management and conservation efforts of biotic communities by identifying the structural relationship of BMI assemblages in the GSMR. My results will help improve bioassessments and continuing research for BMI assemblages found within a large river system.
Book Synopsis Benthic Macroinvertebrate Assemblages and Their Relations with Environmental Variables in the Sacramento and San Joaquin River Drainages, California, 1993-1997 by : Larry R. Brown
Download or read book Benthic Macroinvertebrate Assemblages and Their Relations with Environmental Variables in the Sacramento and San Joaquin River Drainages, California, 1993-1997 written by Larry R. Brown and published by . This book was released on 2000 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Diversity and Composition of Benthic Macroinvertebrate Assemblages in Streams in the Mackenzie River System, Northwest Territories by : Ryan William Scott
Download or read book The Diversity and Composition of Benthic Macroinvertebrate Assemblages in Streams in the Mackenzie River System, Northwest Territories written by Ryan William Scott and published by . This book was released on 2010 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: Impending natural resources development and concern about the effects of climate change have spurred increased efforts to study and monitor aquatic habitats in the Mackenzie River system. As part of Environment Canada's attempt to survey the system in advance of the construction of the Mackenzie Gas Pipeline, benthic macroinvertebrates were sampled at 50 streams spanning the geographical range of the Mackenzie system in the Northwest Territories, Canada, to assess spatial patterns in diversity and assemblage structure and the environmental factors driving them. Replicated, quantitative D-net samples were collected during the late summer of 2005 through 2008, mostly at crossings of the proposed pipeline route. 373 macroinvertebrate taxa were recorded, mainly aquatic insects, which were identified to the genus or species levels; other groups were identified to higher taxonomic levels. Ephemeroptera and Plecoptera diversity declined along a latitudinal gradient, while Trichoptera diversity declined in the middle of the latitudinal range and rose towards the far north. Chironomidae (Diptera) increased in diversity and abundance towards the far north, becoming dominant in the northern sub-arctic forest and lowland tundra of the Mackenzie Delta. Diversity, measured as the average generic richness per stream, correlated with a composite environmental variable representing stream size, but not much else; spatial trends in local generic richness were only apparent in the far north of the study area. Regional diversity was assessed using rarefaction curves and showed a clear decrease from south to north across the study area for most taxa; the major exception was the chironomid subfamilies Orthocladiinae and Chironomini, the former being diverse throughout the study area and the latter increasing in diversity on the tundra. Odonata, Hemiptera and Coleoptera were well-represented in the south of the study area, but decreased sharply in diversity and abundance in the north; another common order, Megaloptera, was entirely absent from the study area, as were crayfish. Community composition varied along a latitudinal gradient, with some species restricted to northern latitudes and many more species restricted to the southern areas. Composition varied by region, as did the environmental factors that control it. Streams in the north of the system are connected to hundreds of small lakes and tend to freeze in the winter, which increases habitat stability; assemblages in this region were characterized by relatively large chironomids that are usually associated with lentic habitats and by a lack of taxa that are intolerant to freezing. Substrate was the main factor explaining differences in assemblage composition in this region. Just to the south, alluvial streams are more common and permafrost is continuous with very shallow active layers, iv which likely results in intense discharge peaks and ice scour in the spring and flashy summer hydrographs. Invertebrates in this region were mainly short-lived, small sized orthoclads, baetids and chloroperlids; the annual disturbance regime seems likely to be an important factor shaping community composition in this region. Many streams in this region received input from saline springs, resulting in perennial flow, and these streams harboured several taxa that were absent or rare in other streams at similar latitudes, including several stoneflies (e.g. Pteronarcys, Sweltsa); the presence of flow during the winter was found to be a major factor affecting community composition in this region, which surrounded the town of Norman Wells, NT. Nutrient dynamics appeared to be important in structuring benthic assemblages in the southern portion of the study region, with highnutrient streams supporting a diverse fauna which included many taxa that were absent in the north, while communities in low-nutrient streams were more similar to the northern alluvial stream fauna. There was no spatial distinction between low- and high-nutrient streams in the southern region, and the difference may be due to the local conditions of permafrost, which is patchy and discontinuous in the region. Evidence that winter ice and permafrost conditions are important drivers of benthic invertebrate diversity and community composition in the Mackenzie system, along with the latitudinal gradients which are consistent with a temperature/climate gradient, raises the possibility that benthic assemblages may be useful as indicators of effects of global climate change on freshwater habitats in the Canadian north. More immediately, construction of the Mackenzie Gas Pipeline may affect stream habitat due to sedimentation, and plans for the operation of the pipeline have raised concerns about potential effects on permafrost conditions. Implications for development of a biomonitoring program utilizing benthic invertebrates and their potential as indicators of climate change are discussed.
Book Synopsis Benthic Macroinvertebrate Metacommunity Structure of the Guadalupe River Basin, TX by : Rebecca A. Zawalski
Download or read book Benthic Macroinvertebrate Metacommunity Structure of the Guadalupe River Basin, TX written by Rebecca A. Zawalski and published by . This book was released on 2017 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: Benthic macroinvertebrates (BMI) are widely used as bio-indicators for local in-stream quality. However, local community structure can be affected by smaller scale (local) environmental conditions and larger scale processes. I assessed the abundance and diversity of BMI and their relationship with local in-stream conditions, regional patterns of land-use/land cover (LULC), and large scale physiographic gradients across the Guadalupe River System, a large basin (3,256 km2) in Central Texas. Macroinvertebrates, water quality, and habitat conditions across 28 sites in the Guadalupe River and its main tributaries were sampled. Highest species diversity occurred near the headwaters, and decreased downstream. Pollution tolerance levels increased downstream and followed an increasing agriculture gradient. Landscape factors explained a large proportion of variation in macroinvertebrate community structure (38%), but 16% of it was spatially structured (shared with spatial factors latitude and longitude) and 4% was explained by spatial factors alone. Local environmental factors were strongly correlated with landscape factors and explained similar amount of variation as landscape factors. My study highlights the importance of incorporating physiographic gradients when examining local and regional diversity and composition of BMI communities, especially in large complex watersheds. My results will help develop more effective monitoring programs for larger river systems.
Book Synopsis Using Traits-based Ecology to Inform Aquatic Insect Assemblage Structure in Relation to Environmental Flows by : Jessica Orlofske
Download or read book Using Traits-based Ecology to Inform Aquatic Insect Assemblage Structure in Relation to Environmental Flows written by Jessica Orlofske and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Benthic macroinvertebrate taxonomic data is the foundation of freshwater biomonitoring programs.around the world. Biological trait information has been proposed as an effective alternative or supplement to taxonomic data for ·biomonitoring purposes. Traits are simply measurable, heritable properties of an organism that interact with the environment. Trait data can expand the geographical scope of assessments as well as describe mechanistic relationships between environmental conditions and the biological community to diagnose impact severity and type of stressor. In riverine ecosystems, a change in the flow regime or hydrological alteration is considered the most significant environmental stressor because of the detrimental effects on biological communities and habitats as well as interactions with other stressors. To maintain ecological integrity, trait data can inform the benthic macroinvertebrate assemblage response to flow properties to support environmental flow management criteria. My objective was to define and evaluate traits and trait metrics that could be linked to hydrological conditions. Specifically, I investigated intra- and inter-tax on trait properties for body size and body shape, which are predicted to respond strongly to hydraulic and hydrologic scale variables. Multiple field sites were sampled several times over a five-year period in the unregulated Miramichi River Basin, New Brunswick, Canada to resolve the relationships between flow and ecology. I was able to demonstrate the importance of intraspecific trait variation and trait properties for characterizing the benthic assemblage. By measuring specimen body sizes and establishing body shape criteria using geometric morphometric analysis, I improved the accuracy of traits-based metrics and demonstrated a sizedependent bias in current taxonomic-based metrics. Using both traditional categorical trait states as well as high-resolution trait data, I was able to characterize relationships among aquatic insects and hydrological properties at nested spatial scales. Then I tested the performance of taxonomic and trait metrics to assess hydrological data over short (two-year) to moderate (five-year) temporal scales. High-resolution trait metrics demonstrated equal or greater association with hydrological factors than taxonomic or other trait metrics at these timescales. Trait information can add value to biomonitoring approaches by accurately describing trait expression, enabling stronger statistical inference, and increasing sensitivity and interpretability, which are essential for evaluating the complex relationship between benthic assemblages and their hydrological environment.
Book Synopsis Responses of Aquatic Benthic Macroinvertebrate Communities to a Large Flow Pulse in the Guadalupe, San Antonio and Brazos River Basins, Texas by : Jeremy Douglas Maikoetter
Download or read book Responses of Aquatic Benthic Macroinvertebrate Communities to a Large Flow Pulse in the Guadalupe, San Antonio and Brazos River Basins, Texas written by Jeremy Douglas Maikoetter and published by . This book was released on 2018 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Riverine benthic macroinvertebrates (BMI) communities are regulated, in part, by the dynamic character of the river's flow regime. Purpose of this study was to assess the influence of a flow regime component (i.e., large flow pulse) on BMI riffle communities, specifically that large flow pulses shifted structure (i.e., richness and density), and therefore maintain the biotic integrity of riverine riffle BMI communities. Predictions were that BMI richness and density would decrease and recover with large flow pulses, ranging between 1 in 2 year events (340 m3/s) to 1 in 5 year events (331 to 886 m3/s), but that density reductions and recovery would differ among taxa categorized as swift, moderate, and slack forms. BMI communities were monitored at 11 sites located in three river basins and distributed among upper and lower reaches of major rivers and tributary streams. A total of 93,400 aquatic macroinvertebrates were identified to family and used to estimate BMI richness and BMI density among 102 riffles (61 riffles pre-flood and 41 riffles post-flood) between 2014 and 2017. Physical and chemical aspects of riffle habitats were similar between pre-flood and post-flood, except that post-flood riffles had less sand and gravel than pre-flood. BMI communities were similar among river basins and were segregated along environmental gradients related to physical and chemical (16%), season (6%), and flood (2%) effects. Only a few sites differed in BMI richness and density between pre-flood and post-flood, indicating that BMI communities among seven of the 11 sites likely recovered before the post-flood sampling events. Increased densities or relative abundances were detected at four sites for swift BMI, at one site for moderate BMI, and at one site for slack BMI. Decreased densities or relative abundances were detected at one site for moderate BMI and at two sites for slack BMI. Among taxa, relative abundances of seven BMI families, which were categorized as swift or moderate, generally increased among the 11 sites, whereas relative abundances of five BMI families, which were categorized as moderate or slack, generally decreased among the 11 sites. Although increasing or decreasing trends in BMI categories and families between pre-flood and post-flood periods were not consistent among all sites, study results suggest that density and relative abundance of some BMI taxa responded positively (e.g., Baetidae, Hydropsychidae, Isonychiidae) and negatively (e.g., Elmidae, Leptophlebiidae, Chironomidae) to high flow pulses. Therefore, flow-responsive BMI taxa found in this study provide potential indicator species for environmental flow standards assessments, although the ubiquitous use of these indicator species across and within drainages is limited.
Book Synopsis Rapid Bioassessment Protocols for Use in Streams and Rivers by :
Download or read book Rapid Bioassessment Protocols for Use in Streams and Rivers written by and published by . This book was released on 1989 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Benthic Macroinvertebrate Assemblages Across the Non-perennial Stream System of the Konza Prairie, Kansas by : Alice Belskis
Download or read book Benthic Macroinvertebrate Assemblages Across the Non-perennial Stream System of the Konza Prairie, Kansas written by Alice Belskis and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Non-perennial streams, those that do not continuously flow, make up 51-60% of the earth's streams by length. Yet, they are understudied relative to their perennial, or continuously flowing, counterparts. We sought to determine how benthic macroinvertebrate (BMIs) community structure and beta diversity patterns were related to abiotic factors in non-perennial streams, as they contribute to fauna in downstream perennial waterways. We sampled 38 sites across a non-perennial prairie stream network for BMIs and measured hydrological, biogeochemical, and other environmental variables. We identified the BMIs using DNA metabarcoding. We calculated local contributions to beta diversity (LCBD) to identify ecologically unique sites and calculated species contributions to beta diversity (SCBD) to determine taxa with the strongest contributions to beta diversity patterns across the stream network. Our results show that while LCBD was not influenced by abiotic factors, the richness and replacement components of LCBD were strongly influenced by a site's distance to an upstream groundwater seep. The top contributor to SCBD was Stenonema femoratum, followed by 7 genera of Chironomidae, Perlesta cinctipes, and Faxonius virilis. Importantly, our DNA metabarcoding approach allowed us to identify Chironomidae to the genus level, revealing their importance in SCBD. When considering BMI community structure, an NMDS (Non-Metric Multidimensional Scaling) analysis revealed that the percent flowing water at each site was driving the differences in species across the sites. Here we show that proximity to groundwater sources is key to BMI beta diversity patterns in non-perennial stream networks, and that Chironomidae taxa are important in producing these patterns. This study allows us to fill in some of the knowledge gaps surrounding non-perennial stream beta diversity patterns and provides us with an understanding of the factors that potentially influence these interactions.
Book Synopsis Spatial Variation in Macroinvertebrates in Groundwater-dominated Rivers by : Kirby Lynn McCready Wright
Download or read book Spatial Variation in Macroinvertebrates in Groundwater-dominated Rivers written by Kirby Lynn McCready Wright and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Benthic macroinvertebrate communities in riverine ecosystems are shaped by both local and large-scale influences. Most models of riverine community structure are grouped into either discrete or continuum conceptual models. However, there is much uncertainty in how these two classes of conceptual models apply to macroinvertebrate communities in the physicochemically consistent headwaters of spring-influenced rivers. This thesis examined benthic macroinvertebrate community composition and biomass among local discrete geomorphic mesohabitats (riffles, runs, and pools) and along an upstream to downstream gradient in two spring-fed rivers in central Texas (San Marcos River and Comal River, Hays County). The goal of my thesis was to examine the relative importance of downstream distance from springhead versus smaller-scale habitat conditions (i.e., mesohabitat units) in explaining the variation in macroinvertebrate community structure in these two spring-based subtropical riverine systems. I hypothesized that, because I sample in the upper physicochemically consistent reaches of both rivers that local mesohabitat conditions would explain more variation in community composition than downstream distance from springhead. I expected this change in community composition would be driven by replacement of taxa rather than differences in taxonomic richness. I also predicted that non-native benthic species would be more evenly distributed throughout the study reaches due to the consistency of physicochemical conditions. Finally, I predicted that the distribution of taxa specific biomass contributions will follow patterns seen in community composition change and will reflect taxonomic density estimates. To test these hypotheses, I sampled macroinvertebrates and local habitat parameters from mesohabitat types along three reaches in the first ~4 km of each river. I also determined biomass of each taxon and community-wide patterns of biomass distribution of benthic macroinvertebrates. I found that variation in taxonomic composition in both rivers was driven to a greater or equal amount by upstream to downstream distance from spring-influence, and by mesohabitat type. Taxonomic diversity did not vary with distance from springhead but was consistently lower in pool mesohabitats when compared to runs and riffles in both rivers. Compositional changes and patterns in b-diversity within mesohabitat types among study reaches indicated that replacement (as opposed to richness differences) was the main mechanism leading to patterns of b-diversity. I found that a non-native snail (Tarebia granifera) and an endemic spring snail (Elimia comalensis) appear to be spatially partitioning habitat in an upstream- to downstream manner. Finally, I found that Tarebia granifera constituted the largest proportion of benthic macroinvertebrate biomass in several study reaches downstream from springheads.
Book Synopsis Freshwater Biomonitoring and Benthic Macroinvertebrates by : David M. Rosenberg
Download or read book Freshwater Biomonitoring and Benthic Macroinvertebrates written by David M. Rosenberg and published by Springer. This book was released on 1993 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: North American and European governments have adopted national programs for environmental monitoring and assessment that include the use of aquatic biota. These programs will use a variety of indicators of environmental health; benthic macroinvertebrates are one of the most promising of them. The chapters in this book deal with the many different approaches available for using benthic macroinvertebrates in biological monitoring programs.
Book Synopsis Seasonal and Longitudinal Changes in Functional Feeding Group Composition of Benthic Macroinvertebrates in the San Marcos River, Texas by : Joseph McMurry Owen
Download or read book Seasonal and Longitudinal Changes in Functional Feeding Group Composition of Benthic Macroinvertebrates in the San Marcos River, Texas written by Joseph McMurry Owen and published by . This book was released on 1996 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Macroinvertebrate Functional Organization, Diversity, and Life History Variation Along a Sierra Nevada River Continuum, California by : Richard Lee Bottorff
Download or read book Macroinvertebrate Functional Organization, Diversity, and Life History Variation Along a Sierra Nevada River Continuum, California written by Richard Lee Bottorff and published by . This book was released on 1990 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Macroinvertebrate Assemblage Structure in a Kilometer Reach of a Stable, Groundwater Stream System : a Thesis Submitted in Partial Fulfillment ... for the Degree of Master of Science (Natural Resources and Environment) ... by : Beth L. Sparks-Jackson
Download or read book Macroinvertebrate Assemblage Structure in a Kilometer Reach of a Stable, Groundwater Stream System : a Thesis Submitted in Partial Fulfillment ... for the Degree of Master of Science (Natural Resources and Environment) ... written by Beth L. Sparks-Jackson and published by . This book was released on 2000 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Benthic Assemblage Structure, and the Feeding Biology of Sixteen Macroinvertebrate Taxa from the Buffalo River, Eastern Cape, South Africa by : Carolyn Gay Palmer
Download or read book Benthic Assemblage Structure, and the Feeding Biology of Sixteen Macroinvertebrate Taxa from the Buffalo River, Eastern Cape, South Africa written by Carolyn Gay Palmer and published by . This book was released on 1992 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Comparison of Benthic Macroinvertebrate Assemblages Between Perennial and Intermittent Headwater Streams of the Mattole River in Northern California, USA by : Mason S. London
Download or read book A Comparison of Benthic Macroinvertebrate Assemblages Between Perennial and Intermittent Headwater Streams of the Mattole River in Northern California, USA written by Mason S. London and published by . This book was released on 2017 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intermittent streams are common throughout the world and comprise 60% or more of total river lengths in the conterminous United States. Despite their prevalence, intermittent streams are understudied, particularly first-order headwater streams, which are vital for maintaining the function, health and biotic diversity of river networks. In June 2016, I sampled five intermittent and five perennial headwater streams in the Mattole River watershed in northwestern coastal California, USA, to compare benthic macroinvertebrate (BMI) assemblages between intermittent and perennial streams. BMI samples were collected using a 500μm mesh D-net at eight randomly located riffles along a 150-m reach, and then composited, on each of the 10 streams. Chemical (e.g. pH, dissolved oxygen, temperature, and flow) and physical (e.g. bed substrate composition, bank-full width, and slope) data were measured at each stream reach. BMI samples were identified using Standard Taxonomic Effort (STE). Major difference in assemblages among stream type were not detected except for a few individual taxa, families, and orders. Observed differences likely resulting from taxonomic differences in life history timing. The proportion of shredders was detectably lower in intermittent streams. Further studies with a temporal factor are needed to validate these findings.
Book Synopsis Novel Approaches in Macroinvertebrate Biomonitoring by : Ely Kosnicki
Download or read book Novel Approaches in Macroinvertebrate Biomonitoring written by Ely Kosnicki and published by . This book was released on 2008 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: The increasing popularity of benthic macroinvertebrate use for biological monitoring and assessment of lotic systems calls for new applications for regions with a lesser known fauna and an overall better understanding of how community measures are influenced by seasonal variability. Two separate studies are presented to address aspects of biological monitoring that are seldom studied. The first study focused on evaluation of Grass Riparian Filter Strip effectiveness in north central Missouri. Streams within conservation areas and unprotected reaches were sampled to identify metrics that could distinguish between undesired and best attainable conditions. These metrics were used to construct two assessment tools, a Benthic Index of Biotic Integrity (B-IBI) and a novel technique we call a Least Desired Index (LDI). LDI works in a reciprocal fashion to B-IBI in that the lowest scoring criteria of the metrics are set by anti-reference stream conditions, or conditions that represent an undesirable quality. B-IBIs were developed from the conservation stream samples and the LDI was developed from the unprotected stream reaches. Two test sites with established GRFS were sampled and assessed with the B-IBI and the LDI. B-IBI determined that the GRFS sites showed moderate improvements where the LDI showed that the GRFS sites made no improvements. The LDI was considered to be a more realistic assessment considering that the GRFS at the test sites had only been established for 2 years and the reference streams used to construct the B-IBI were most likely impaired. The second study utilized a state designated reference stream as a case study for temporally profiling the community structure. Samples of benthic macroinvertebrates and water quality were taken approximately monthly to fulfill four objectives. The first objective was to determine if a temporal profile of the community might better reveal members of the community that are rare and transient. The second objective was to consider the maturity of each individual in weighting abundances and how these might affect the interpretation of the community structure. The third objective examined annual variability of 120 metrics. Multiple regressions with physico-chemico-temporal variables were created to see if these metrics could be predicted for samples taken during the following year. The last objective was to construct a River Invertebrate Prediction and Classification System (RIVPACS) model that classified seasons based on the biota and to use this model to predict and compare the community composition of samples taken during the following year. Rare and two types of transient taxa were recognized. Rare taxa were considered to be residents of the community, but infrequently encountered. Transient type I taxa were considered adventitious, and transient type II were short lived. Maturity weighted abundances showed significant changes in community measures and were found to be useful in aspects of other analyses. Few metrics exhibited low variation over the annual period, and fewer were predictable, indicating that seasonal variation can have a significant impact on measurements used in biological monitoring. The RIVPACS model biologically classified three seasons. Overall, the model moderately predicted community structure, also highlighting that macroinvertebrate communities are difficult to consistently quantify. Lotic habitats are important resources but are dynamic systems exhibiting challenging perspectives with regard to monitoring and quality assessment.
Download or read book Algal Ecology written by and published by Academic Press. This book was released on 1996-06-03 with total page 781 pages. Available in PDF, EPUB and Kindle. Book excerpt: Algae are an important component of aquatic benthic ecosystems because they reflect the health of their environment through their density, abundance, and diversity. This comprehensive and authoritative text is divided into three sections to offer complete coverage of the discussion in this field. The first section introduces the locations of benthic algae in different ecosystems, like streams, large rivers, lakes, and other aquatic habitats. The second section is devoted to the various factors, both biotic and abiotic, that affect benthic freshwater algae. The final section of the book focuses on the role played by algae in a variety of complex freshwater ecosystems. As concern over environmental health escalates, the keystone and pivotal role played by algae is becoming more apparent. This volume in the Aquatic Ecology Series represents an important compilation of the latest research on the crucial niche occupied by algae in aquatic ecosystems. Presents algae as the important player in relation to environmental health Prepared by leading authorities in the field Includes comprehensive treatment of the functions of benthic algae as well as the factors that affect these important aquatic organisms Acts as an important reference for anyone interested in understanding and managing freshwater ecosystems
