Author: Adrianne P. Smits
Publisher:
ISBN:
Category : Carbon cycle (Biogeochemistry)
Languages : en
Pages : 144
Book Description
Aquatic ecosystem responses to changing climate and land-use are often extremely heterogeneous across landscapes: studies than quantify relationships between watershed features and biogeochemical and food web processes at intermediate scales (e.g., watershed-scale) would provide a means to extrapolate local findings across landscapes, potentially aiding future management efforts. I investigated how watershed features influence the movement of materials and energy between aquatic and terrestrial environments. I worked in a nearly pristine boreal river system in southwest Alaska (Wood River), where a high level of physical heterogeneity, coupled with natural landscape gradients, provided an opportunity to explore watershed geomorphic controls on ecosystem processes in streams. In Chapter 2 I used fatty acid biomarkers as novel tracers of food web pathways to assess how assimilation of heterotrophic bacteria and algae by stream insects varied across a landscape gradient in watershed features. I found that watershed features such as mean slope are correlated with the energetic base of food webs in boreal streams, with algal resources more important in steep streams and bacterial resources more important in flat watersheds. In Chapter 3 I used fatty acid and stable isotope tracers, coupled with several years of growth data, to investigate how stream thermal regimes affected the ability of juvenile coho salmon (Oncorhynchus kisutch) to benefit from marine resource subsidies (sockeye salmon eggs). I found that local environmental conditions (mean summer stream temperature) were a stronger control on fish growth than the magnitude of the resource subsidy, but also that individuals varied substantially in their metabolic responses to an energy-rich food source. In Chapter 4 I examined geomorphic controls on the magnitude and sources of stream CO2 emissions from boreal streams. I found that watershed slope interacts with precipitation events to control terrestrial carbon fluxes into and out of streams. Watershed slope influences C loading and stream CO2 fluxes by determining the amount of carbon accumulation in watersheds, and to a lesser extent by determining gas transfer velocity across the air-water interface. These patterns provide a way to extrapolate across boreal landscapes by constraining CO2 concentration and flux estimates by local geomorphic features. In this dissertation I demonstrated that interactions between geomorphology, climate, and organisms produce incredible variability in ecosystem processes (carbon cycling, food web pathways) within a single river system, but that geomorphic features of watersheds regulate that variability.
Physical Controls on Land-water Linkages
Author: Adrianne P. Smits
Publisher:
ISBN:
Category : Carbon cycle (Biogeochemistry)
Languages : en
Pages : 144
Book Description
Aquatic ecosystem responses to changing climate and land-use are often extremely heterogeneous across landscapes: studies than quantify relationships between watershed features and biogeochemical and food web processes at intermediate scales (e.g., watershed-scale) would provide a means to extrapolate local findings across landscapes, potentially aiding future management efforts. I investigated how watershed features influence the movement of materials and energy between aquatic and terrestrial environments. I worked in a nearly pristine boreal river system in southwest Alaska (Wood River), where a high level of physical heterogeneity, coupled with natural landscape gradients, provided an opportunity to explore watershed geomorphic controls on ecosystem processes in streams. In Chapter 2 I used fatty acid biomarkers as novel tracers of food web pathways to assess how assimilation of heterotrophic bacteria and algae by stream insects varied across a landscape gradient in watershed features. I found that watershed features such as mean slope are correlated with the energetic base of food webs in boreal streams, with algal resources more important in steep streams and bacterial resources more important in flat watersheds. In Chapter 3 I used fatty acid and stable isotope tracers, coupled with several years of growth data, to investigate how stream thermal regimes affected the ability of juvenile coho salmon (Oncorhynchus kisutch) to benefit from marine resource subsidies (sockeye salmon eggs). I found that local environmental conditions (mean summer stream temperature) were a stronger control on fish growth than the magnitude of the resource subsidy, but also that individuals varied substantially in their metabolic responses to an energy-rich food source. In Chapter 4 I examined geomorphic controls on the magnitude and sources of stream CO2 emissions from boreal streams. I found that watershed slope interacts with precipitation events to control terrestrial carbon fluxes into and out of streams. Watershed slope influences C loading and stream CO2 fluxes by determining the amount of carbon accumulation in watersheds, and to a lesser extent by determining gas transfer velocity across the air-water interface. These patterns provide a way to extrapolate across boreal landscapes by constraining CO2 concentration and flux estimates by local geomorphic features. In this dissertation I demonstrated that interactions between geomorphology, climate, and organisms produce incredible variability in ecosystem processes (carbon cycling, food web pathways) within a single river system, but that geomorphic features of watersheds regulate that variability.
Publisher:
ISBN:
Category : Carbon cycle (Biogeochemistry)
Languages : en
Pages : 144
Book Description
Aquatic ecosystem responses to changing climate and land-use are often extremely heterogeneous across landscapes: studies than quantify relationships between watershed features and biogeochemical and food web processes at intermediate scales (e.g., watershed-scale) would provide a means to extrapolate local findings across landscapes, potentially aiding future management efforts. I investigated how watershed features influence the movement of materials and energy between aquatic and terrestrial environments. I worked in a nearly pristine boreal river system in southwest Alaska (Wood River), where a high level of physical heterogeneity, coupled with natural landscape gradients, provided an opportunity to explore watershed geomorphic controls on ecosystem processes in streams. In Chapter 2 I used fatty acid biomarkers as novel tracers of food web pathways to assess how assimilation of heterotrophic bacteria and algae by stream insects varied across a landscape gradient in watershed features. I found that watershed features such as mean slope are correlated with the energetic base of food webs in boreal streams, with algal resources more important in steep streams and bacterial resources more important in flat watersheds. In Chapter 3 I used fatty acid and stable isotope tracers, coupled with several years of growth data, to investigate how stream thermal regimes affected the ability of juvenile coho salmon (Oncorhynchus kisutch) to benefit from marine resource subsidies (sockeye salmon eggs). I found that local environmental conditions (mean summer stream temperature) were a stronger control on fish growth than the magnitude of the resource subsidy, but also that individuals varied substantially in their metabolic responses to an energy-rich food source. In Chapter 4 I examined geomorphic controls on the magnitude and sources of stream CO2 emissions from boreal streams. I found that watershed slope interacts with precipitation events to control terrestrial carbon fluxes into and out of streams. Watershed slope influences C loading and stream CO2 fluxes by determining the amount of carbon accumulation in watersheds, and to a lesser extent by determining gas transfer velocity across the air-water interface. These patterns provide a way to extrapolate across boreal landscapes by constraining CO2 concentration and flux estimates by local geomorphic features. In this dissertation I demonstrated that interactions between geomorphology, climate, and organisms produce incredible variability in ecosystem processes (carbon cycling, food web pathways) within a single river system, but that geomorphic features of watersheds regulate that variability.
Land-water Linkages in Rural Watersheds
Author:
Publisher: Food & Agriculture Org.
ISBN: 9789251047651
Category : Business & Economics
Languages : en
Pages : 92
Book Description
It is often assumed that upstream land use practices have important impacts on water resources and affect the downstream users at a watershed scale, Payments by downstream users to upstream users for "environmental services" such as good water quality, less sediments or more regular water flow are widely discussed. However, much controversy exists about the direction and magnitude of such impacts, how they influence the relationships between upstream and down-stream users, and which mechanisms allow for a sharing of resulting benefits and costs by all resource users in a watershed context. To address these issues, the FAO Land and Water Development Division organized the electronic workshop "Land-Water Linkages in Rural Watersheds" from 18 September to 27 October 2000. The present publication contains the proceedings of the workshop and two papers that set the stage for the workshop discussions. The complete workshop documentation, including discussion archive, background papers, and case studies, is included on the CD-ROM that accompanies the document.
Publisher: Food & Agriculture Org.
ISBN: 9789251047651
Category : Business & Economics
Languages : en
Pages : 92
Book Description
It is often assumed that upstream land use practices have important impacts on water resources and affect the downstream users at a watershed scale, Payments by downstream users to upstream users for "environmental services" such as good water quality, less sediments or more regular water flow are widely discussed. However, much controversy exists about the direction and magnitude of such impacts, how they influence the relationships between upstream and down-stream users, and which mechanisms allow for a sharing of resulting benefits and costs by all resource users in a watershed context. To address these issues, the FAO Land and Water Development Division organized the electronic workshop "Land-Water Linkages in Rural Watersheds" from 18 September to 27 October 2000. The present publication contains the proceedings of the workshop and two papers that set the stage for the workshop discussions. The complete workshop documentation, including discussion archive, background papers, and case studies, is included on the CD-ROM that accompanies the document.
Strategic Analyses of the National River Linking Project (NRLP) of India
Author: International Water Management Institute
Publisher: IWMI
ISBN: 9290906979
Category : Irrigation efficiency
Languages : en
Pages : 409
Book Description
Contributed articles.
Publisher: IWMI
ISBN: 9290906979
Category : Irrigation efficiency
Languages : en
Pages : 409
Book Description
Contributed articles.
Land, Water and Development
Author: Malcolm Newson
Publisher: Routledge
ISBN: 1134732309
Category : Science
Languages : en
Pages : 460
Book Description
This is a fully revised and expanded second edition of Malcolm Newson's acclaimed book. Exploring in greater depth the meaning of sustainability in river basin development this new edition: * highlights the rapid evolution of practical concepts since the Rio Earth Summit * features new illustrations and case studies from Australia, South Africa and Israel * makes the ecosystem model more explicit throughout * strengthens coverage of the linkages between land and water management.
Publisher: Routledge
ISBN: 1134732309
Category : Science
Languages : en
Pages : 460
Book Description
This is a fully revised and expanded second edition of Malcolm Newson's acclaimed book. Exploring in greater depth the meaning of sustainability in river basin development this new edition: * highlights the rapid evolution of practical concepts since the Rio Earth Summit * features new illustrations and case studies from Australia, South Africa and Israel * makes the ecosystem model more explicit throughout * strengthens coverage of the linkages between land and water management.
Strategic Analyses of the National River Linking Project (NRLP) of India: Water productivity improvements in Indian agriculture : poentials, constraints, and prospects
Author: International Water Management Institute
Publisher: IWMI
ISBN: 9290907126
Category : Irrigation efficiency
Languages : en
Pages : 162
Book Description
Contributed articles.
Publisher: IWMI
ISBN: 9290907126
Category : Irrigation efficiency
Languages : en
Pages : 162
Book Description
Contributed articles.
EPA-430/9
Unconnected Transport Networks
Author: Hans-Liudger Dienel
Publisher: Campus Verlag
ISBN: 9783593376615
Category : Airports
Languages : en
Pages : 222
Book Description
Publisher: Campus Verlag
ISBN: 9783593376615
Category : Airports
Languages : en
Pages : 222
Book Description
Linking Hydrological and Biogeochemical Processes in Riparian Corridors
Author: Dipankar Dwivedi
Publisher: Frontiers Media SA
ISBN: 2889710742
Category : Science
Languages : en
Pages : 285
Book Description
Publisher: Frontiers Media SA
ISBN: 2889710742
Category : Science
Languages : en
Pages : 285
Book Description
Handbook on Water Security
Author: Claudia Pahl-Wostl
Publisher: Edward Elgar Publishing
ISBN: 1782548017
Category : Business & Economics
Languages : en
Pages : 385
Book Description
Water security has received increasing attention in the scientific and public policy communities in recent years. The Handbook on Water Security is a much-needed resource that helps the reader navigate between the differing interpretations of water security. It explains the various dimensions of the topic by approaching it both conceptually and thematically, as well as in relation to experiences in different regions of the world. The international contributors explore the various perspectives on water security to show that it has multiple meanings that cannot easily be reconciled. Topics discussed include: challenges from human security to consumerism, how trade policies can help to achieve water security in a transboundary setting, the potential of risk-based governance arrangements and the ecology of water security. Scholars and postgraduate students in the social sciences working on water-related issues will find this book to be of substantial interest. It will strongly appeal to policymakers and practitioners looking at the strengths and limitations of water security.
Publisher: Edward Elgar Publishing
ISBN: 1782548017
Category : Business & Economics
Languages : en
Pages : 385
Book Description
Water security has received increasing attention in the scientific and public policy communities in recent years. The Handbook on Water Security is a much-needed resource that helps the reader navigate between the differing interpretations of water security. It explains the various dimensions of the topic by approaching it both conceptually and thematically, as well as in relation to experiences in different regions of the world. The international contributors explore the various perspectives on water security to show that it has multiple meanings that cannot easily be reconciled. Topics discussed include: challenges from human security to consumerism, how trade policies can help to achieve water security in a transboundary setting, the potential of risk-based governance arrangements and the ecology of water security. Scholars and postgraduate students in the social sciences working on water-related issues will find this book to be of substantial interest. It will strongly appeal to policymakers and practitioners looking at the strengths and limitations of water security.
Managing for Healthy Ecosystems
Author: David J. Rapport
Publisher: CRC Press
ISBN: 1420032135
Category : Nature
Languages : en
Pages : 1548
Book Description
One of the critical issues of our time is the dwindling capacity of the planet to provide life support for a large and growing human population. Based on a symposium on ecosystem health, Managing for Healthy Ecosystems identifies key issues that must be resolved if there is to be progress in this complex area, such as: Evolving methods f
Publisher: CRC Press
ISBN: 1420032135
Category : Nature
Languages : en
Pages : 1548
Book Description
One of the critical issues of our time is the dwindling capacity of the planet to provide life support for a large and growing human population. Based on a symposium on ecosystem health, Managing for Healthy Ecosystems identifies key issues that must be resolved if there is to be progress in this complex area, such as: Evolving methods f