Download or read book The Use of Zooplankton Biomass Size Spectra as Indicators of Environmental Change in Oneida Lake New York written by Allison Elaine Gamble and published by . This book was released on 2003 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Utility of Zooplankton Size Spectrum Parameters as Ecological Indicators written by Lauren Emily Barth and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The overarching goal of this thesis is to assess the sensitivity of the zooplankton community size spectrum to ecosystem change in lakes. This was accomplished using two large-scale datasets to investigate the temporal and spatial patterns of the zooplankton normalized abundance size spectrum (NASS). First, using a 30-year time series from eight lakes (Dorset lakes) I characterized the range of variability in the zooplankton NASS associated with among-lake differences and long-term environmental change and documented its common seasonal pattern. The slope (relative abundance of small and large organisms) was a relatively stable feature of the zooplankton community compared with the height (total abundance). I detected a relatively strong seasonal signal in both the slope and the height, with an overall decline in height and increase in slope over the ice-free season. Second, I used the Dorset lake dataset to investigate the among-lake and among-year drivers of variability in the zooplankton NASS and its responsiveness to invasion by Bythotrephes, a spiny water flea. Morphometric characteristics were the best predictors of both the slope and the height. Temporal variability in the slope was related to changes in lake phosphorus levels, while in the height it was related to dissolved organic carbon and ice duration. The NASS changed in both central tendency and variability after Bythotrephes invaded, demonstrating its usefulness as an indicator of a top-down perturbation. Last, I used a diverse group of Ontario lakes to better understand the drivers of among-lake variability in the zooplankton NASS. Consistent with previous results, morphometry was a strong driver of variability. Additionally, there was a strong spatial signal in the slope and seasonal signal in the height. Once these factors were controlled for, I was able to detect an influence of the fish community and anthropogenic stressors. Taken together, the zooplankton size spectrum is responsive to both bottom-up and top-down factors, with unusual size spectrum slope values potentially indicating a strong perturbation. I have offered some recommendations for continued development of the zooplankton community size spectrum as a universal tool for lake monitoring.
Download or read book Canadian Journal of Fisheries and Aquatic Sciences written by and published by . This book was released on 1987 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Using Zooplankton as Indicators of Environmental Quality to Inform Management of Small Lakes of Eastern New York written by James P. Tucci and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Zooplankton Community Analysis written by W.M. Jr. Lewis and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is based on the premise that the study of ecological communities should be a composite analysis of system properties (community structure, community energetics) and population properties (life history patterns, adaptive strategies) backed by a thorough understanding of the physical chemical environment. Too frequently community ecology takes a much narrower focus. This may partly be the result of perceived antagonisms between schools of thought in ecology. Despite their rather separate origins, the multiple theoretical and methodological tools that now exist must be applied synthetically to real communities if the progress of the past two decades is to continue into the next two. This book has a case history format, which increases the opportunity for detailed analysis, although I have attempted to maintain the general per spective of a community ecologist and to draw extensively from the literature whenever it seems profitable to do so. The case history data are for Lake Lanao, a large tropical lake. The main zooplankton data base used in the analysis is entirely original and unpublished, although the detailed support ing data on the physical-chemical environment and the phytoplankton com munity have been presented in numerous journal articles and are thus abstracted or used selectively to meet the needs of zooplankton community analysis.
Download or read book Linking Zooplankton Community Composition to Ecosystem Functioning Off the West Coast of Vancouver Island and in the Northeast Subarctic Pacific written by Theresa Ann Venello and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Zooplankton play a key role in the functioning of marine ecosystems by transferring energy from phytoplankton to higher trophic levels. Additionally, because of their short generation times and ability to respond rapidly to oceanographic conditions, they have been used as indicators of ecosystem health. Despite their use as ecosystem indicators, there are still critical knowledge gaps in our understanding of zooplankton communities. This includes links between zooplankton biodiversity and ecosystem functions, such as productivity and energy transfer. Difficulties making empirical measurements of ecosystem functions has also created a barrier in addressing these gaps. Lastly, functional role assessments of zooplankton communities can give more insight into the ecological roles of zooplankton species/groups, how they affect ecosystem function, and how community roles may reorganize under climate change scenarios. Chapter 1 introduces zooplankton as crucial to the functioning of marine ecosystems and as key ecological indicators. It also discusses measures of ecosystem function and biodiversity, and drivers of variation in zooplankton communities. Chapter 1 also outlines the objectives of this thesis and describes the regional oceanographic setting of the subarctic northeast Pacific in the context of those objectives. Chapter 2 applies a functional traits-based approach to a 35-year time series of mesozooplankton biomass on the southern shelf along the west coast of Vancouver Island, Canada. Eight functional groups were identified using a functional-trait similarity approach from which biomass anomaly time series for each group were calculated. Generalized additive modeling (GAM) was used to identify drivers of functional group biomass anomaly variability. GAM results found that the key drivers were a local sea surface temperature, the Southern Oscillation Index (SOI), the Pacific Decadal Oscillation (PDO), as well as the North Pacific Gyre Oscillation (NPGO). Functional group biomass anomalies for gelatinous zooplankton were strongest in 2015, with comparably little change in crustacean zooplankton group biomass anomalies throughout the time series. This suggests a degree of functional redundancy within these groups, with endemic species dominating in cool years and southern species replacing them in warm years. Chapter 3 quantifies patterns of spatiotemporal variability in crustacean zooplankton production rates (BPR) using the chitobiase method and assesses regional drivers of BPR variability. As an alternative to traditional, labor-intensive, and species-specific production rates, the chitobiase method provides a community-level estimate of somatic production for all developing crustacean zooplankton. BPR was measured along the west coast of Vancouver Island and in the subarctic NE Pacific during 2005, 2009-2011, and 2015-2018. GAMs determined that sea surface temperature, satellite chlorophyll a and crustacean zooplankton biomass significantly influenced the BPR of crustacean zooplankton, although the relationships between BPR and predictor variables differed between regions. High BPR values occurred in years with a high biomass of large-bodied cold-water indicator species, while low BPR values were associated with a biomass dominated by small-bodied warm-water species. Chapter 4 estimates trophic transfer efficiency (TTE) using BPR and net community production rates from 2015-2018. TTE varied from just greater than 0% to 35%, with annual means both below the oft-assumed 10% average (6% and 5.1% in 2015 and 2018 respectively) and above 10% (14% and 15% in 2016 and 2017, respectively). The effect of zooplankton community composition and functional and taxonomic diversity on TTE was also investigated. Functional dispersion, functional divergence, species evenness, and mixed layer depth temperature were identified as significant explanatory variables of TTE across the study area. Zooplankton community composition differed significantly between high and low TTE communities, driven primarily by differences in the abundance of the Omnivore-Herbivores and Active Ambush Omnivores from a functional trait perspective and by the abundances of Boreal-Shelf, Oithona spp., and Southern copepods from a geographic-taxonomic one. This chapter presents routine rate-based TTE estimates across a variety of oceanographic conditions - an area of research that is critical to our understanding of marine ecosystems but which has many poorly understood components. This chapter therefore helps to bridge that knowledge gap. Chapter 5 includes some general conclusions on what may become a "new normal" for zooplankton communities in the subarctic northeast Pacific under increased ocean warming, and considers potential consequences for higher tropic levels. Additionally, this chapter highlights some long-standing ecological assumptions that have been challenged within this thesis. This thesis concludes by exploring the future work that will be needed to refine our understanding of pelagic marine ecosystems and the relationships between production rates and oceanographic regimes.
Download or read book The Biomass Spectrum written by S. R. Kerr and published by Columbia University Press. This book was released on 2001-08-29 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Kerr and Dickie propose the development of a new ecological theory, one that can lead to a more effective remedy for the drastic effects of heavy fishing on natural communities of organisms in both marine and freshwater environments. By plotting the densities of the biomass of all organisms in a given community by body-size classes, the authors provide empirical evidence of what they term "the biomass body-size spectrum" in the world's oceans. After examining this evidence, they propose an underlying theory of predator-prey energy transfer: larger species eat smaller species, providing energy exchange across all species within an ecosystem. Providing the first comprehensive synthesis of the energy flow within the biomass spectrum, this book demonstrates not only a new understanding of the self-organizing properties of ecological production systems but also the potential of the biomass spectrum methodology for offering practical remedies when these natural systems are exploited by humans.
Download or read book Ecosystem Responses to Mercury Contamination written by Reed Harris and published by CRC Press. This book was released on 2007-03-05 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: As rising levels of mercury in the environment pose an increasing threat of toxicity to humans and wildlife, several laws already call for industries to reduce mercury emissions at the source. Ecosystem Responses to Mercury Contamination: Indicators of Change outlines the infrastructure and methods needed to measure, monitor, and regulate the conce
Download or read book Fish and Fisheries Management in Lakes and Reservoirs written by and published by . This book was released on 1993 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aquatic Food Webs written by Andrea Belgrano and published by Oxford University Press, USA. This book was released on 2005 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: 'Aquatic Food Webs' provides a current synthesis of theoretical and empirical food web research. The textbook is suitable for graduate level students as well as professional researchers in community, ecosystem, and theoretical ecology, in aquatic ecology, and in conservation biology.
Download or read book Cyanobacterial Harmful Algal Blooms State of the Science and Research Needs written by H. Kenneth Hudnell and published by Springer Science & Business Media. This book was released on 2008-03-13 with total page 955 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the ever-increasing incidence of harmful cyanobacterial algal blooms, this monograph has added urgency and will be essential reading for all sorts of researchers, from neuroscientists to cancer research specialists. The volume contains the proceedings of the 2005 International Symposium on Cyanobacterial Harmful Algal Blooms, and has been edited by H. Kenneth Hudnell, of the US Environmental Protection Agency. It contains much of the most recent research into the subject.
Download or read book Ecology and Classification of North American Freshwater Invertebrates written by James H. Thorp and published by Academic Press. This book was released on 2010 with total page 1036 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The third edition of Ecology and Classification of North American Freshwater Invertebrates continues the tradition of in-depth coverage of the biology, ecology, phylogeny, and identification of freshwater invertebrates from the USA and Canada. This text serves as an authoritative single source for a broad coverage of the anatomy, physiology, ecology, and phylogeny of all major groups of invertebrates in inland waters of North America, north of Mexico." --Book Jacket.
Download or read book Analysis of Marine Ecosystems written by Alan R. Longhurst and published by London ; Toronto : Academic Press. This book was released on 1981 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Shallow Lakes 95 written by Lech Kufel and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shallow lakes differ from deep ones in many aspects of nutrient dynamics, biotic structure and interactions of various trophic levels. Though very common in European lowlands, shallow lakes attract inadequate attention from research teams. This book aims at filling gaps in our knowledge of the processes which take place in non-stratified lakes. It contains proceedings from the international conference `Shallow Lakes *95' held in Mikolajki, Poland, on 20-26 August 1995. In more than 50 original papers up-to-date views on eutrophication, degradation and recovery of shallow lakes are presented. The first four sections of the book (Nutrient fluxes, Biotic structure, Trophic interactions and Whole lake studies) deal with theoretical aspects of lake functioning while the fifth (Biomanipulation, restoration and management) is devoted to practical measures undertaken to improve water quality in shallow lakes. The book is therefore addressed to university biologists and ecologists and PhD students, as well as to managers involved in restoration of shallow lakes.
Download or read book Biological Problems in Water Pollution written by and published by . This book was released on 1965 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fish Energetics written by Peter Tytler and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is almost thirty years since Professor G. G. Winberg established the basis for experimental studies in fish energetics with the publication of his monograph, Rate of Metabolism and Food Requirements of Fishes. His ultimate aim was to develop a scientific approach to fish culture and management, and the immense volume of literature generated in the ensuing years has been mainly in response to the demand for information from a rapidly expanding, world-wide aquaculture industry and to the shortcomings of contemporary practices in fisheries management. The purpose of this book is not to review this literature compre hensively, but, assuming an informed readership, to focus attention on topics in which new knowledge and theory are beginning to be applied in practice. Most emphasis has been placed on food; feeding; production (growth and reproduction) and energy budgeting, as these have most influence on the development of fish culture. Some chapters offer practical advice for the selection of methods, and warn of pitfalls in previous approaches. In others the influence of new theory on the interpretation of studies in fish energetics is discussed in the context of resource allocation and adaptation. We hope that the scope of material presented here will have sufficient interest and value to help significantly to fulfil Winberg's original objectives.
Download or read book Great Lakes Fish Egg and Larvae Identification written by John Boreman and published by . This book was released on 1976 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
