Author: Mark Paul Herzog
Publisher:
ISBN:
Category : Brant
Languages : en
Pages : 176
Book Description
"Body size is an important determinant of life history traits such as survival and fecundity. There is a positive correlation between growth during the first summer and final body size in goose populations. I examined how environmental factors influence growth in Black Brant (Branta bernicla; hereafter brant) goslings. Growth declined seasonally and varied among brood-rearing areas. However, the pattern was not consistent among years. Models containing only environment and maternal effects explained 75% of variation in gosling mass, indicating that little of the observed variation in size is directly of genetic origin. Heritability did not differ from zero for both mother-daughter and father-daughter regressions. I also conducted an experiment to study the effect of gosling density on food abundance, feeding behavior, and development of brant goslings, in two habitat types important to brant: (1) Carex subspathacea grazing lawns and (2) slough levees which contain Triglochin palustris. Variation in grazing pressure was experimentally manipulated. Biomass and offtake of C. subspathacea was higher in lightly grazed plots than in heavily grazed plots even though goslings within heavily grazed plots spent more time feeding. Within slough levee habitat there were no differences between heavily and lightly grazed plots in either biomass or offtake of T. palustris. Peck rates were lower in slough levee habitat than in grazing lawns. Change in mass over an eight hour trial was positively correlated with the amount of forage biomass in the plot at the start of the trial. I found no variation in internal morphometrics or body composition among goslings. I also examined the relationship between forage available within a brood-rearing area, the number of birds using the area, and gosling growth. Annual variation in use of brood-rearing areas was correlated with forage availability. Gosling mass was negatively correlated with brood numbers when examined across all areas, however, within each brood-rearing area, the relationship between mass and numbers of birds was positive. I did not see a relationship between estimates of food availability (per m2) and brood numbers. Spatial variation in growth among habitats may result from habitats varying in quality and quantity of forage"--Leaf 4
Environmental Regulation of Growth in Black Brant
Author: Mark Paul Herzog
Publisher:
ISBN:
Category : Brant
Languages : en
Pages : 176
Book Description
"Body size is an important determinant of life history traits such as survival and fecundity. There is a positive correlation between growth during the first summer and final body size in goose populations. I examined how environmental factors influence growth in Black Brant (Branta bernicla; hereafter brant) goslings. Growth declined seasonally and varied among brood-rearing areas. However, the pattern was not consistent among years. Models containing only environment and maternal effects explained 75% of variation in gosling mass, indicating that little of the observed variation in size is directly of genetic origin. Heritability did not differ from zero for both mother-daughter and father-daughter regressions. I also conducted an experiment to study the effect of gosling density on food abundance, feeding behavior, and development of brant goslings, in two habitat types important to brant: (1) Carex subspathacea grazing lawns and (2) slough levees which contain Triglochin palustris. Variation in grazing pressure was experimentally manipulated. Biomass and offtake of C. subspathacea was higher in lightly grazed plots than in heavily grazed plots even though goslings within heavily grazed plots spent more time feeding. Within slough levee habitat there were no differences between heavily and lightly grazed plots in either biomass or offtake of T. palustris. Peck rates were lower in slough levee habitat than in grazing lawns. Change in mass over an eight hour trial was positively correlated with the amount of forage biomass in the plot at the start of the trial. I found no variation in internal morphometrics or body composition among goslings. I also examined the relationship between forage available within a brood-rearing area, the number of birds using the area, and gosling growth. Annual variation in use of brood-rearing areas was correlated with forage availability. Gosling mass was negatively correlated with brood numbers when examined across all areas, however, within each brood-rearing area, the relationship between mass and numbers of birds was positive. I did not see a relationship between estimates of food availability (per m2) and brood numbers. Spatial variation in growth among habitats may result from habitats varying in quality and quantity of forage"--Leaf 4
Publisher:
ISBN:
Category : Brant
Languages : en
Pages : 176
Book Description
"Body size is an important determinant of life history traits such as survival and fecundity. There is a positive correlation between growth during the first summer and final body size in goose populations. I examined how environmental factors influence growth in Black Brant (Branta bernicla; hereafter brant) goslings. Growth declined seasonally and varied among brood-rearing areas. However, the pattern was not consistent among years. Models containing only environment and maternal effects explained 75% of variation in gosling mass, indicating that little of the observed variation in size is directly of genetic origin. Heritability did not differ from zero for both mother-daughter and father-daughter regressions. I also conducted an experiment to study the effect of gosling density on food abundance, feeding behavior, and development of brant goslings, in two habitat types important to brant: (1) Carex subspathacea grazing lawns and (2) slough levees which contain Triglochin palustris. Variation in grazing pressure was experimentally manipulated. Biomass and offtake of C. subspathacea was higher in lightly grazed plots than in heavily grazed plots even though goslings within heavily grazed plots spent more time feeding. Within slough levee habitat there were no differences between heavily and lightly grazed plots in either biomass or offtake of T. palustris. Peck rates were lower in slough levee habitat than in grazing lawns. Change in mass over an eight hour trial was positively correlated with the amount of forage biomass in the plot at the start of the trial. I found no variation in internal morphometrics or body composition among goslings. I also examined the relationship between forage available within a brood-rearing area, the number of birds using the area, and gosling growth. Annual variation in use of brood-rearing areas was correlated with forage availability. Gosling mass was negatively correlated with brood numbers when examined across all areas, however, within each brood-rearing area, the relationship between mass and numbers of birds was positive. I did not see a relationship between estimates of food availability (per m2) and brood numbers. Spatial variation in growth among habitats may result from habitats varying in quality and quantity of forage"--Leaf 4
Dissertation Abstracts International
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 840
Book Description
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 840
Book Description
Environmental Policy and Public Health
Author: William N. Rom
Publisher: John Wiley & Sons
ISBN: 1118095669
Category : Medical
Languages : en
Pages : 448
Book Description
This textbook provides an overview of the major environmental policy issues, past and present, and explains the interplay among law, science, and advocacy as related to environmental policymaking in the United States and abroad. Environmental Policy and Public Health examines the main sources of pollution and threats to environmental integrity and explores the consequences of pollution on the environment and the population. Throughout the book, noted environmental policy expert William N. Rom explains the legal basis for environmental action, beginning with the Clean Air Act, the Wilderness Act, the National Environmental Policy Act, the Endangered Species Act, and international treaties. In addition to providing information about existing laws, the author presents potential policy alternatives that offer real-world solutions. Comprehensive in scope, the book incorporates developments in law, economics, global warming, and air pollution. Environmental Policy and Public Health covers these topics and also puts an emphasis on wilderness protection. An important focus of the book is an assessment of the role of policy analysis in the formation and implementation of national and local environmental policy. Companion Web site: www.josseybass.com/go/rom
Publisher: John Wiley & Sons
ISBN: 1118095669
Category : Medical
Languages : en
Pages : 448
Book Description
This textbook provides an overview of the major environmental policy issues, past and present, and explains the interplay among law, science, and advocacy as related to environmental policymaking in the United States and abroad. Environmental Policy and Public Health examines the main sources of pollution and threats to environmental integrity and explores the consequences of pollution on the environment and the population. Throughout the book, noted environmental policy expert William N. Rom explains the legal basis for environmental action, beginning with the Clean Air Act, the Wilderness Act, the National Environmental Policy Act, the Endangered Species Act, and international treaties. In addition to providing information about existing laws, the author presents potential policy alternatives that offer real-world solutions. Comprehensive in scope, the book incorporates developments in law, economics, global warming, and air pollution. Environmental Policy and Public Health covers these topics and also puts an emphasis on wilderness protection. An important focus of the book is an assessment of the role of policy analysis in the formation and implementation of national and local environmental policy. Companion Web site: www.josseybass.com/go/rom
Final Environmental Impact Statement
Author:
Publisher:
ISBN:
Category : Environmental impact statements
Languages : en
Pages : 664
Book Description
Publisher:
ISBN:
Category : Environmental impact statements
Languages : en
Pages : 664
Book Description
The Natural History of an Arctic Oil Field
Author: Joe C. Truett
Publisher: Elsevier
ISBN: 0080512410
Category : Science
Languages : en
Pages : 461
Book Description
In spite of the harsh conditions that characterize the Arctic, it is a surprisingly fragile ecosystem. The exploration for oil in the Arctic over the past 30 years has had profound effects on the plants and animals that inhabit this frozen clime. The Natural History of an Arctic Oil Field synthesizes decades of research on these myriad impacts. Specialists with years of field experience have contributed to this volume to create the first widely available synopsis of the ecology and wildlife biology of animals and plants living in close association with an actively producing oil field. - First widely available synthesis of arctic oil field ecology and wildlife biology - Concise yet readable treatment of a diverse polar ecosystem - Useful for land managers, policy makers as well as ecologists, and population biologists - Chapters authored by recognized authorities and contributions are peer-reviewed for accuracy and scientific rigor - Illustrations attractively designed to enhance comprehension
Publisher: Elsevier
ISBN: 0080512410
Category : Science
Languages : en
Pages : 461
Book Description
In spite of the harsh conditions that characterize the Arctic, it is a surprisingly fragile ecosystem. The exploration for oil in the Arctic over the past 30 years has had profound effects on the plants and animals that inhabit this frozen clime. The Natural History of an Arctic Oil Field synthesizes decades of research on these myriad impacts. Specialists with years of field experience have contributed to this volume to create the first widely available synopsis of the ecology and wildlife biology of animals and plants living in close association with an actively producing oil field. - First widely available synthesis of arctic oil field ecology and wildlife biology - Concise yet readable treatment of a diverse polar ecosystem - Useful for land managers, policy makers as well as ecologists, and population biologists - Chapters authored by recognized authorities and contributions are peer-reviewed for accuracy and scientific rigor - Illustrations attractively designed to enhance comprehension
Liberty Development and Production Plan
Information Sources and Services Directory
Author: United States. Department of the Interior. Office of Library andInformation Services
Publisher:
ISBN:
Category : Indians of North America
Languages : en
Pages : 380
Book Description
Publisher:
ISBN:
Category : Indians of North America
Languages : en
Pages : 380
Book Description
Supplemental Environmental Impact Statement
Author: United States. Minerals Management Service
Publisher:
ISBN:
Category : Continental shelf
Languages : en
Pages : 192
Book Description
Publisher:
ISBN:
Category : Continental shelf
Languages : en
Pages : 192
Book Description
Final Environmental Document
Information Sources and Services Directory
Author: United States. Department of the Interior. Office of Library and Information Services
Publisher:
ISBN:
Category : Indians of North America
Languages : en
Pages : 382
Book Description
Publisher:
ISBN:
Category : Indians of North America
Languages : en
Pages : 382
Book Description