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Author : Mark D. Munn
Release : 2018
Genre : Biotic communities
Kind : eBook
Book Rating : 838/5 ( reviews)
Book Synopsis Understanding the Influence of Nutrients on Stream Ecosystems in Agricultural Landscapes by : Mark D. Munn
Download or read book Understanding the Influence of Nutrients on Stream Ecosystems in Agricultural Landscapes written by Mark D. Munn. This book was released on 2018. Available in PDF, EPUB and Kindle. Book excerpt: "National Water-Quality Assessment Project."
Author : Jeremy B. Jones
Release : 2016-07-07
Genre : Science
Kind : eBook
Book Rating : 198/5 ( reviews)
Book Synopsis Stream Ecosystems in a Changing Environment by : Jeremy B. Jones
Download or read book Stream Ecosystems in a Changing Environment written by Jeremy B. Jones. This book was released on 2016-07-07. Available in PDF, EPUB and Kindle. Book excerpt: Stream Ecosystems in a Changing Environment synthesizes the current understanding of stream ecosystem ecology, emphasizing nutrient cycling and carbon dynamics, and providing a forward-looking perspective regarding the response of stream ecosystems to environmental change. Each chapter includes a section focusing on anticipated and ongoing dynamics in stream ecosystems in a changing environment, along with hypotheses regarding controls on stream ecosystem functioning. The book, with its innovative sections, provides a bridge between papers published in peer-reviewed scientific journals and the findings of researchers in new areas of study. Presents a forward-looking perspective regarding the response of stream ecosystems to environmental change Provides a synthesis of the latest findings on stream ecosystems ecology in one concise volume Includes thought exercises and discussion activities throughout, providing valuable tools for learning Offers conceptual models and hypotheses to stimulate conversation and advance research
Author :
Release : 2014
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Cross-ecosystem Delivery of Nutrients to Streams by :
Download or read book Cross-ecosystem Delivery of Nutrients to Streams written by . This book was released on 2014. Available in PDF, EPUB and Kindle. Book excerpt: Movement of nutrients among ecosystems is a key process that drives productivity and influences ecological dynamics. This dissertation explores two aspects of nutrient transfer among ecosystems: translocation by migratory species and landscape controls on terrestrial ecosystem losses. As migrants move among ecosystems they can transfer materials and energy that alter ecosystem dynamics and processes. Among fishes, salmon are well-known to transfer large quantities of nutrients from the ocean to their freshwater spawning grounds as they migrate and die en masse. Less is known about the role of fish that spawn multiple times over their life and thus do not leave large quantities of carcasses in their spawning grounds. Much of this dissertation explores the role of white and longnose suckers as nutrient vectors in Great Lakes tributaries. I documented the early life history of longnose suckers, pathways of nutrient contributions from sucker migrations, and ecosystem metabolic responses. I found that sucker eggs and excretion contribute large quantities of nutrients to their spawning streams. Because early life mortality is often >99% and larvae spend little time feeding in their spawning streams, most of these nutrients become available to stream biota. Sucker nutrient contributions were large relative to background availability, even in an agricultural watershed context, and they led to increased gross primary production but not ecosystem respiration. Landscape processes also exert important influence over the availability and transport of nutrients in streams. Human land use has transformed many stream ecosystems as agriculture and urban development supply nutrients and alter stream hydrology. In the Hawaiian archipelago, human land use overlays large gradients of substrate age, precipitation, and slope which are important determinants of nutrient availability in terrestrial ecosystems. I examined the relative importance of natural gradients and human land use in determining stream nutrient concentrations and found that weathering patterns remain the primary control over P availability across the landscape, but that human activities are more important for N.
Author : Charles William Goss
Release : 2014
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Influence of Forest Fragments on Headwater Stream Ecosystems in Agricultural Landscapes by : Charles William Goss
Download or read book Influence of Forest Fragments on Headwater Stream Ecosystems in Agricultural Landscapes written by Charles William Goss. This book was released on 2014. Available in PDF, EPUB and Kindle. Book excerpt: It is widely recognized that headwater stream ecosystems are intimately associated with riparian forests. Riparian forests trap sediment, filter nutrients, provide shading, and are sources of allochthonous energy for stream food webs. Reciprocally, streams fuel riparian consumers via aquatic-to-terrestrial fluxes of aquatic emergent insects. The widespread clearing of forests in agricultural landscapes, however, has led to a decoupling of forest-stream dynamics. Patches of forest in these landscapes are often small and isolated, but may retain important functional forest-stream linkages that are otherwise absent in the surrounding agricultural landscape matrix. In this dissertation I report on a series of studies with the goal of assessing the influence of forest patches on reciprocal linkages between forests and streams in agricultural landscapes.
Author : National Research Council
Release : 2000-08-17
Genre : Science
Kind : eBook
Book Rating : 483/5 ( reviews)
Book Synopsis Clean Coastal Waters by : National Research Council
Download or read book Clean Coastal Waters written by National Research Council. This book was released on 2000-08-17. Available in PDF, EPUB and Kindle. Book excerpt: Environmental problems in coastal ecosystems can sometimes be attributed to excess nutrients flowing from upstream watersheds into estuarine settings. This nutrient over-enrichment can result in toxic algal blooms, shellfish poisoning, coral reef destruction, and other harmful outcomes. All U.S. coasts show signs of nutrient over-enrichment, and scientists predict worsening problems in the years ahead. Clean Coastal Waters explains technical aspects of nutrient over-enrichment and proposes both immediate local action by coastal managers and a longer-term national strategy incorporating policy design, classification of affected sites, law and regulation, coordination, and communication. Highlighting the Gulf of Mexico's "Dead Zone," the Pfiesteria outbreak in a tributary of Chesapeake Bay, and other cases, the book explains how nutrients work in the environment, why nitrogen is important, how enrichment turns into over-enrichment, and why some environments are especially susceptible. Economic as well as ecological impacts are examined. In addressing abatement strategies, the committee discusses the importance of monitoring sites, developing useful models of over-enrichment, and setting water quality goals. The book also reviews voluntary programs, mandatory controls, tax incentives, and other policy options for reducing the flow of nutrients from agricultural operations and other sources.
