Ingela Jansson | Swedish University of Agricultural Sciences (original) (raw)
Papers by Ingela Jansson
Biological Conservation, 2016
Highlights • Age-based methods to sustainably hunt require precise age estimates from appearance.... more Highlights • Age-based methods to sustainably hunt require precise age estimates from appearance. • Used photos to track trait change with male lion age and test hunter aging accuracy. • 6 traits precisely indicate 4 age classes: 1-2.9 year, 3-4.9 year, 5-6.9 year, ≥ 7 year. • Hunters used traits to accurately age 69% of lions, with fewest errors for ≥ 7 year. • Min harvest age of 7 year with strict enforcement could enable sustainable harvest.
The habitat selection of five brown bears (Ursus arctos) in central Sweden was studied from sprin... more The habitat selection of five brown bears (Ursus arctos) in central Sweden was studied from spring until late summer during 2005. All bears were sexually mature females equipped with GPS-receivers. The forest dominating landscape occupied by these bears is highly affected by forestry, dividing the forest into single age stands and large clear-cuts, intersected by lakes and mires. Habitat use within each bear's home range was compared at two temporal scales; seasonal and diel period. The study period was divided into the mating season and the berry season, corresponding to a shift in both dominant food types and behaviour. Further the 24 hour day was divided into four periods, relating to the bears predominating activity status; active or passive. Bears used the habitats within their home ranges non-randomly. Individual variation was large and there were few indications of a general selection for particular habitats, with the exception of mire which was selected against by all bears. Habitat use differed between the seasons for 4 of the 5 bears and among periods of the day. Bears were generally less selective of habitats during the mating season. During the 24 hour day, bears were most selective during the daytime resting period, particularly in the selection against more open habitat types; clear-cuts and mires. My data suggests that the bears' habitat selection was more driven by their need of shelter than food abundance, as the bear's omnivorous habits enables it to find food in most habitats of the boreal forest. To verify precision and reliability of the GPS fixes a field inventory of GPS bear relocations were made. Fresh bear signs were detected in 64-74 % of 1057 visited sites, depending on season. The GPS-GSM setup in this study generally functioned well, and the overall success for attempted fixes were 76 %, with a decreasing fix-success through the study period. However, there was a bias against successful GPS fixes when a bear was passive, which needs to be considered in analyses of habitat selection.
Canadian Journal of Zoology, 2007
The goal of habitat selection studies is to identify important habitats for a particular species.... more The goal of habitat selection studies is to identify important habitats for a particular species. However, most studies using radiotelemetry have focused on habitat-selection patterns using daytime positions only. We used 24 h data from six female brown bears ( Ursus arctos L., 1758) equipped with GPS–GSM collars and activity loggers to analyse variations in habitat selection related to diel variations in activity (foraging and resting). We found that the bears rested mainly during the daylight hours and foraged mainly during the crepuscular and nocturnal hours. The bears selected habitats differently when they were resting than when they were foraging. We found no selection for tall coniferous forest using all data, but this habitat was selected by resting bears and avoided by foraging bears. Thus, for studies of habitat selection, our results show the importance of obtaining data from all 24 h and dividing these data into relevant categories based on the diel activity pattern of t...
Routledge eBooks, Nov 26, 2019
In one volume, this book brings together a diversity of approaches, theory and frameworks that ca... more In one volume, this book brings together a diversity of approaches, theory and frameworks that can be used to analyse the governance of renewable natural resources. Renewable natural resources are under pressure, with over-exploitation and degradation raising concern globally. Understanding governance systems and practice is essential for developing effective and fair solutions. This book introduces readers to key concepts and issues concerned with the governance of renewable natural resources and illustrates the diversity of approaches, theories and frameworks that have been used to analyse governance systems and practice. Each chapter provides an introduction to an area of literature and theory and demonstrates application through a case study. The book covers a range of geographical locations, with a focus on low-and middle-income countries, and several types of natural resources. The approaches and theories introduced include common property theory, political ecology, institutional analysis, the social-ecological systems framework and social network analysis. Findings from across the chapters support an analytical focus on institutions and local context and a practical focus on diverse, flexible and inclusive governance solutions. The book serves as an essential introduction to the governance of renewable natural resources for students, researchers and practitioners.
Biological Conservation, 2016
Highlights • Age-based methods to sustainably hunt require precise age estimates from appearance.... more Highlights • Age-based methods to sustainably hunt require precise age estimates from appearance. • Used photos to track trait change with male lion age and test hunter aging accuracy. • 6 traits precisely indicate 4 age classes: 1-2.9 year, 3-4.9 year, 5-6.9 year, ≥ 7 year. • Hunters used traits to accurately age 69% of lions, with fewest errors for ≥ 7 year. • Min harvest age of 7 year with strict enforcement could enable sustainable harvest.
The habitat selection of five brown bears (Ursus arctos) in central Sweden was studied from sprin... more The habitat selection of five brown bears (Ursus arctos) in central Sweden was studied from spring until late summer during 2005. All bears were sexually mature females equipped with GPS-receivers. The forest dominating landscape occupied by these bears is highly affected by forestry, dividing the forest into single age stands and large clear-cuts, intersected by lakes and mires. Habitat use within each bear's home range was compared at two temporal scales; seasonal and diel period. The study period was divided into the mating season and the berry season, corresponding to a shift in both dominant food types and behaviour. Further the 24 hour day was divided into four periods, relating to the bears predominating activity status; active or passive. Bears used the habitats within their home ranges non-randomly. Individual variation was large and there were few indications of a general selection for particular habitats, with the exception of mire which was selected against by all bears. Habitat use differed between the seasons for 4 of the 5 bears and among periods of the day. Bears were generally less selective of habitats during the mating season. During the 24 hour day, bears were most selective during the daytime resting period, particularly in the selection against more open habitat types; clear-cuts and mires. My data suggests that the bears' habitat selection was more driven by their need of shelter than food abundance, as the bear's omnivorous habits enables it to find food in most habitats of the boreal forest. To verify precision and reliability of the GPS fixes a field inventory of GPS bear relocations were made. Fresh bear signs were detected in 64-74 % of 1057 visited sites, depending on season. The GPS-GSM setup in this study generally functioned well, and the overall success for attempted fixes were 76 %, with a decreasing fix-success through the study period. However, there was a bias against successful GPS fixes when a bear was passive, which needs to be considered in analyses of habitat selection.
Canadian Journal of Zoology, 2007
The goal of habitat selection studies is to identify important habitats for a particular species.... more The goal of habitat selection studies is to identify important habitats for a particular species. However, most studies using radiotelemetry have focused on habitat-selection patterns using daytime positions only. We used 24 h data from six female brown bears ( Ursus arctos L., 1758) equipped with GPS–GSM collars and activity loggers to analyse variations in habitat selection related to diel variations in activity (foraging and resting). We found that the bears rested mainly during the daylight hours and foraged mainly during the crepuscular and nocturnal hours. The bears selected habitats differently when they were resting than when they were foraging. We found no selection for tall coniferous forest using all data, but this habitat was selected by resting bears and avoided by foraging bears. Thus, for studies of habitat selection, our results show the importance of obtaining data from all 24 h and dividing these data into relevant categories based on the diel activity pattern of t...
Routledge eBooks, Nov 26, 2019
In one volume, this book brings together a diversity of approaches, theory and frameworks that ca... more In one volume, this book brings together a diversity of approaches, theory and frameworks that can be used to analyse the governance of renewable natural resources. Renewable natural resources are under pressure, with over-exploitation and degradation raising concern globally. Understanding governance systems and practice is essential for developing effective and fair solutions. This book introduces readers to key concepts and issues concerned with the governance of renewable natural resources and illustrates the diversity of approaches, theories and frameworks that have been used to analyse governance systems and practice. Each chapter provides an introduction to an area of literature and theory and demonstrates application through a case study. The book covers a range of geographical locations, with a focus on low-and middle-income countries, and several types of natural resources. The approaches and theories introduced include common property theory, political ecology, institutional analysis, the social-ecological systems framework and social network analysis. Findings from across the chapters support an analytical focus on institutions and local context and a practical focus on diverse, flexible and inclusive governance solutions. The book serves as an essential introduction to the governance of renewable natural resources for students, researchers and practitioners.