Mats Svensson - Academia.edu (original) (raw)
Papers by Mats Svensson
McGill-Queen's University Press eBooks, Sep 16, 2003
Managing forest ecosystems, 2002
Popular Abstract in Swedish Feromonmedierat parningssystem hos ett nattfly Min avhandlings huvuds... more Popular Abstract in Swedish Feromonmedierat parningssystem hos ett nattfly Min avhandlings huvudsakliga mal ar att identifiera och bestamma faktorer som paverkar det feromon-medierade parningsystemet hos sadesbroddflyet Agrotis segetum. Dessa faktorer inkluderar bade honkonets produktion av sexualferomon saval som hankonets feromon-inducerade respons, men ocksa andra overlevnads- och reproduktionsfaktorer. Jag har undersokt de reproduktiva begransningarna hos sadesbroddflyets parningssystem (I), den individuella variationen och repeterbarheten av honans feromonsignal hos arten i fraga (II). Jag har ocksa analyserat hanens detektion och diskriminering av feromonsignaler (III och IV), samt tillika studerat den hanliga variation i feromonrespons (V). For att satta in detta i ett sammanhang, kan det vara lampligt med en kort introduktion till amnet: Kommunikation och signaler Studier av hur kommunikation mellan djur sker har alltid varit ett av de centrala intressena inom zooekologi. Manga signaler som anvands av djur har lange fascinerat manniskan, faglars sang, dagfjarilarnas farger for att namna nagra. Kommunikationen mellan djur ar i sig intrikat. A en sida sa bor djur inte anvanda sig av signaler som exponerar dem for rovdjur och parasiter. A andra sidan sa ar ett av huvudmalen med att signalera att fa just uppmarksamhet. Kemisk kommunikation ar mycket vanlig ibland djur, speciellt hos insekterna. Insekter kommunicerar inte bara med kemiska signaler, utan anvander ocksa visuella och akustiska signaler, men kemiska signaler ar vanligast och troligen det ursprungliga kommunikationssattet. Kemiska signaler anvands for en rad olika syften, for att soka foda, avskracka fiender och konkurrenter saval som for att mediera parning. Av alla kommunikationssatt sa ar kemisk kommunikation langsammast. Tillika sa ar det svart att rikta signalen till en speciell adressat. Kemiska signaler sprids med vindens hjalp och blir darmed bara riktade nedvinds. Avklingningstiden ar ocksa lang, dvs att byta budskap tar lang tid. De tva stora fordelarna med kemiska signaler ar att de ar billiga och dess langa rackvidd. Manga signaler hos djuren ar stereotypa, vilket ocksa kemiska signaler ar. En av de viktigaste informationsbitarna i en kemisk signal ar avsandarens arttillhorighet. Artspecificitet hos kemiska signaler kan uppnas pa flera vis; man kan anvanda en speciell, unik blandning av flera kemiska komponenter, eller en specifik kvot av tva eller flera komponenter. Tillika sa kan specificiteten forbattras genom temporala och/eller spatiala faktorer, som speciell tid eller plats for signalering, eller tillsammans med andra signaler. Kemiska signaler kan ocksa fungera som antagonistiska signaler for andra arter. Till skillnad fran andra parningssystem dar visuella eller akustiska signaler anvands, som hos t ex faglarna, ar det oftast honorna som ar det signalproducerande konet och hanarna som ar det responderande vid kemisk kommunikation hos insekter. Denna rollfordelning ar troligen paverkad av kostnaden for signalering respektive respons, men paverkas ocksa av skillnader mellan konen i hur mycket de investerar i avkomman. Kemiska signaler, feromoner, ar att betrakta som billiga att tillverka och relativt riskfria att anvanda, till skillnad fran visuella och akustiska. Daremot ar det mer energikravande och riskfyllt att respondera. Darav foljer att hanarna, som investerar mindre i avkomman an vad honorna gor, ar de som soker, vilket ar dyrare. Kommunikation kan alltid betraktas ur tva olika perspektiv; sandarens och mottagarens. Det overforda budskapet kan darfor ocksa vara olika. Nar det galler kemiska signaler hos insekter, har hanar och honor olika syften. For hanarnas del galler det att detektera och finna sa manga honor som mojligt. For honornas del ar det av storre vikt att finna sa bra hane som mojligt att para sig med, dvs kvantitet ar viktigt for hanar medan kvalitet ar viktigt for honor. Parningssystem och sexuell selektion Parningssystem ar vanligen kategoriserade utifran antalet parningar hos hanar och honor. Antalet parningar paverkas till mycket stor del genom den s k operationella konskvoten (eng. OSR, Operational Sex Ratio), vilket ar andelen parningsbenagna honor i forhallande till andelen parningsbenagna hanar vid vilken given tid som helst. Antalet parningar paverkas ocksa av konens investeringar i parningar och avkomma. Det kon som vanligen investerar minst bor ocksa vara det som har storst variation mellan individerna parningsframgang. Den overvagande delen av insekterna, inte minst fjarilarna, har polygyna parningssystem, dvs en hane kan inseminera flera honor. Honorna parar sig daremot sallan med fler en eller ett par hanar. Darav foljer att det oftast ar konkurrens mellan hanarna om honorna. Vad kan man da forvanta sig for egenskaper hos framgangsrika fjarilshanar? Eftersom det ar hanarna som soker, sa bor sa bra sokegenskaper som mojligt vara av godo. Hos fjarilar som anvander sig av feromonkommunikation…
SEAMLESS integrated project aims at developing an integrated framework that allows exante assessm... more SEAMLESS integrated project aims at developing an integrated framework that allows exante assessment of agricultural and environmental policies and technological innovations. The framework will have multi-scale capabilities ranging from field and farm to the EU25 and globe; it will be generic, modular and open and using state-of-the art software. The project is carried out by a consortium of 30 partners, led by Wageningen University (NL).
Popular Abstract in Swedish Feromonmedierat parningssystem hos ett nattfly Min avhandlings huvuds... more Popular Abstract in Swedish Feromonmedierat parningssystem hos ett nattfly Min avhandlings huvudsakliga mal ar att identifiera och bestamma faktorer som paverkar det feromon-medierade parningsystemet hos sadesbroddflyet Agrotis segetum. Dessa faktorer inkluderar bade honkonets produktion av sexualferomon saval som hankonets feromon-inducerade respons, men ocksa andra overlevnads- och reproduktionsfaktorer. Jag har undersokt de reproduktiva begransningarna hos sadesbroddflyets parningssystem (I), den individuella variationen och repeterbarheten av honans feromonsignal hos arten i fraga (II). Jag har ocksa analyserat hanens detektion och diskriminering av feromonsignaler (III och IV), samt tillika studerat den hanliga variation i feromonrespons (V). For att satta in detta i ett sammanhang, kan det vara lampligt med en kort introduktion till amnet: Kommunikation och signaler Studier av hur kommunikation mellan djur sker har alltid varit ett av de centrala intressena inom zooekologi. Ma...
General information State: Published Organisations: National Institute of Aquatic Resources, Inst... more General information State: Published Organisations: National Institute of Aquatic Resources, Institute Management, Aarhus University Contributors: Andrusaitis, A., Cox, D., Dosdat, A., Emeis, K., Harms, J., Heral, M., Herrmann, P., ten Hoopen, F., Jennings, S., Johannesson, K., Kononen, K., Köster, F., Laamanen, M., Niilonen, T., Ollikainen, M., Raaska, L., Riemann, B., Sirola, M., Stuefer, J., Svensson, M., Wolf, U. Number of pages: 59 Publication date: 2016
Managing Forest Ecosystems, 2002
The Royal Forester A. D. Israel Strom made the statement cited above in his 1822 book ”Forslag ti... more The Royal Forester A. D. Israel Strom made the statement cited above in his 1822 book ”Forslag till en Forbattrad Skogshushallning i Sverige” (A Proposal for Improved Forest Husbandry in Sweden), which was the main textbook on the subject in Sweden for almost a century. He was uncritically in favour of systematic clear-felling and the development of single aged stands. Israel Strom and his followers taught and defended clear-cutting in an era in which unregulated forest use was common. They rejected the method of selective use and of tree and branch harvesting practiced in Germany and in France. During the period since 1800 a number of different periods in south Swedish forestry can be identified, before 1820 natural householding was practiced, where forest were not industrially used in any significant degree, except in the mining areas in Bergslagen. During the period of 1820–1890, the influence of the Royal forester Israel af Strom was felt, leading to ordered clear-cutting systems, and the development of forest yield tables, production planning and growth promotion systems. In the period 1890–1910 much open land was replanted, due to a perceived lack of forests. During 1905 the first Swedish forest management law was enacted, stipulating the requirements placed on forest regeneration (Skogen-Sveriges Nationalatlas 1990).
Managing Forest Ecosystems, 2002
Managing Forest Ecosystems, 2002
Environmental Modelling & Software, 2009
Integrated Assessment and Modelling (IAM) provides an interdisciplinary approach to support ex-an... more Integrated Assessment and Modelling (IAM) provides an interdisciplinary approach to support ex-ante decision-making by combining quantitative models representing different systems and scales into a framework for integrated assessment. Scenarios in IAM are developed in the interaction between scientists and stakeholders to explore possible pathways of future development. As IAM typically combines models from different disciplines, there is a clear need for a consistent definition and implementation of ...
SEAMLESS integrated project aims at developing an integrated framework that allows exante assessm... more SEAMLESS integrated project aims at developing an integrated framework that allows exante assessment of agricultural and environmental policies and technological innovations. The framework will have multi-scale capabilities ranging from field and farm to the EU25 and globe; it will be generic, modular and open and using state-of-the art software. The project is carried out by a consortium of 30 partners, led by Wageningen University (NL).
Sustainable issues need to be investigated on both spatial and temporal scales. Scale level inter... more Sustainable issues need to be investigated on both spatial and temporal scales. Scale level interactions in different societal sectors suggest that the sustainability concept is ranging depending on the observed time scale. A western household system has an expected duration of 50 years. The sustainability time perspective is thus limited to this period, as since households do not plan generations ahead. Lifestyle patterns, including “ecological living” is influenced by several factors, mainly living and consumption. Dynamic simulation can identify important components of a lifestyle that maintain the highest Ecological Footprint value through time. Ecological footprints are calculated by converting the living and consumption to corresponding ecosystems areas required to support the production of the needed material. System analysis was used to simulate development of the ecological footprint over time of two lifestyles from two different townships in southern Sweden; an ecological ...
Geophysical Journal International, 2011
The aim of this paper is to present an alternative method for the analysis of resistivity data. T... more The aim of this paper is to present an alternative method for the analysis of resistivity data. The methodology was developed during a study to evaluate if electrical resistivity can be used as a tool for analysing subsurface gas dynamics and gas emissions from landfills. The main assumption of this study was that variations in time of resistivity data correspond to variations in the relative amount of gas and water in the soil pores. Field measurements of electrical resistivity, static chamber gas flux and weather data were collected at a landfill in Helsingborg, Sweden. The resistivity survey arrangement consisted of nine lines each with 21 electrodes in an investigation area of 16 ×20 m. The ABEM Lund Imaging System provided vertical and horizontal resistivity profiles every second hour. The data were inverted in Res3Dinv using L 1norm-based optimization method with a standard least-squares formulation. Each horizontal soil layer was then represented as a linear interpolated raster model. Different areas underneath the gas flux measurement points were defined in the resistivity model of the uppermost soil layer, and the vertical extension of the zones could be followed at greater depths in deeper layer models. The average resistivity values of the defined areas were calculated and plotted on a time axis, to provide graphs of the variation in resistivity with time in a specific section of the ground. Residual variation of resistivity was calculated by subtracting the resistivity variations caused by the diurnal temperature variations from the measured resistivity data. The resulting residual resistivity graphs were compared with field data of soil moisture, precipitation, soil temperature and methane flux. The results of the study were qualitative, but promising indications of relationships between electrical resistivity and variations in the relative amount of gas and water in the soil pores were found. Even though more research and better data quality is necessary for verification of the results presented here, we conclude that this alternative methodology of working with resistivity data seems to be a valuable and flexible tool for this application.
McGill-Queen's University Press eBooks, Sep 16, 2003
Managing forest ecosystems, 2002
Popular Abstract in Swedish Feromonmedierat parningssystem hos ett nattfly Min avhandlings huvuds... more Popular Abstract in Swedish Feromonmedierat parningssystem hos ett nattfly Min avhandlings huvudsakliga mal ar att identifiera och bestamma faktorer som paverkar det feromon-medierade parningsystemet hos sadesbroddflyet Agrotis segetum. Dessa faktorer inkluderar bade honkonets produktion av sexualferomon saval som hankonets feromon-inducerade respons, men ocksa andra overlevnads- och reproduktionsfaktorer. Jag har undersokt de reproduktiva begransningarna hos sadesbroddflyets parningssystem (I), den individuella variationen och repeterbarheten av honans feromonsignal hos arten i fraga (II). Jag har ocksa analyserat hanens detektion och diskriminering av feromonsignaler (III och IV), samt tillika studerat den hanliga variation i feromonrespons (V). For att satta in detta i ett sammanhang, kan det vara lampligt med en kort introduktion till amnet: Kommunikation och signaler Studier av hur kommunikation mellan djur sker har alltid varit ett av de centrala intressena inom zooekologi. Manga signaler som anvands av djur har lange fascinerat manniskan, faglars sang, dagfjarilarnas farger for att namna nagra. Kommunikationen mellan djur ar i sig intrikat. A en sida sa bor djur inte anvanda sig av signaler som exponerar dem for rovdjur och parasiter. A andra sidan sa ar ett av huvudmalen med att signalera att fa just uppmarksamhet. Kemisk kommunikation ar mycket vanlig ibland djur, speciellt hos insekterna. Insekter kommunicerar inte bara med kemiska signaler, utan anvander ocksa visuella och akustiska signaler, men kemiska signaler ar vanligast och troligen det ursprungliga kommunikationssattet. Kemiska signaler anvands for en rad olika syften, for att soka foda, avskracka fiender och konkurrenter saval som for att mediera parning. Av alla kommunikationssatt sa ar kemisk kommunikation langsammast. Tillika sa ar det svart att rikta signalen till en speciell adressat. Kemiska signaler sprids med vindens hjalp och blir darmed bara riktade nedvinds. Avklingningstiden ar ocksa lang, dvs att byta budskap tar lang tid. De tva stora fordelarna med kemiska signaler ar att de ar billiga och dess langa rackvidd. Manga signaler hos djuren ar stereotypa, vilket ocksa kemiska signaler ar. En av de viktigaste informationsbitarna i en kemisk signal ar avsandarens arttillhorighet. Artspecificitet hos kemiska signaler kan uppnas pa flera vis; man kan anvanda en speciell, unik blandning av flera kemiska komponenter, eller en specifik kvot av tva eller flera komponenter. Tillika sa kan specificiteten forbattras genom temporala och/eller spatiala faktorer, som speciell tid eller plats for signalering, eller tillsammans med andra signaler. Kemiska signaler kan ocksa fungera som antagonistiska signaler for andra arter. Till skillnad fran andra parningssystem dar visuella eller akustiska signaler anvands, som hos t ex faglarna, ar det oftast honorna som ar det signalproducerande konet och hanarna som ar det responderande vid kemisk kommunikation hos insekter. Denna rollfordelning ar troligen paverkad av kostnaden for signalering respektive respons, men paverkas ocksa av skillnader mellan konen i hur mycket de investerar i avkomman. Kemiska signaler, feromoner, ar att betrakta som billiga att tillverka och relativt riskfria att anvanda, till skillnad fran visuella och akustiska. Daremot ar det mer energikravande och riskfyllt att respondera. Darav foljer att hanarna, som investerar mindre i avkomman an vad honorna gor, ar de som soker, vilket ar dyrare. Kommunikation kan alltid betraktas ur tva olika perspektiv; sandarens och mottagarens. Det overforda budskapet kan darfor ocksa vara olika. Nar det galler kemiska signaler hos insekter, har hanar och honor olika syften. For hanarnas del galler det att detektera och finna sa manga honor som mojligt. For honornas del ar det av storre vikt att finna sa bra hane som mojligt att para sig med, dvs kvantitet ar viktigt for hanar medan kvalitet ar viktigt for honor. Parningssystem och sexuell selektion Parningssystem ar vanligen kategoriserade utifran antalet parningar hos hanar och honor. Antalet parningar paverkas till mycket stor del genom den s k operationella konskvoten (eng. OSR, Operational Sex Ratio), vilket ar andelen parningsbenagna honor i forhallande till andelen parningsbenagna hanar vid vilken given tid som helst. Antalet parningar paverkas ocksa av konens investeringar i parningar och avkomma. Det kon som vanligen investerar minst bor ocksa vara det som har storst variation mellan individerna parningsframgang. Den overvagande delen av insekterna, inte minst fjarilarna, har polygyna parningssystem, dvs en hane kan inseminera flera honor. Honorna parar sig daremot sallan med fler en eller ett par hanar. Darav foljer att det oftast ar konkurrens mellan hanarna om honorna. Vad kan man da forvanta sig for egenskaper hos framgangsrika fjarilshanar? Eftersom det ar hanarna som soker, sa bor sa bra sokegenskaper som mojligt vara av godo. Hos fjarilar som anvander sig av feromonkommunikation…
SEAMLESS integrated project aims at developing an integrated framework that allows exante assessm... more SEAMLESS integrated project aims at developing an integrated framework that allows exante assessment of agricultural and environmental policies and technological innovations. The framework will have multi-scale capabilities ranging from field and farm to the EU25 and globe; it will be generic, modular and open and using state-of-the art software. The project is carried out by a consortium of 30 partners, led by Wageningen University (NL).
Popular Abstract in Swedish Feromonmedierat parningssystem hos ett nattfly Min avhandlings huvuds... more Popular Abstract in Swedish Feromonmedierat parningssystem hos ett nattfly Min avhandlings huvudsakliga mal ar att identifiera och bestamma faktorer som paverkar det feromon-medierade parningsystemet hos sadesbroddflyet Agrotis segetum. Dessa faktorer inkluderar bade honkonets produktion av sexualferomon saval som hankonets feromon-inducerade respons, men ocksa andra overlevnads- och reproduktionsfaktorer. Jag har undersokt de reproduktiva begransningarna hos sadesbroddflyets parningssystem (I), den individuella variationen och repeterbarheten av honans feromonsignal hos arten i fraga (II). Jag har ocksa analyserat hanens detektion och diskriminering av feromonsignaler (III och IV), samt tillika studerat den hanliga variation i feromonrespons (V). For att satta in detta i ett sammanhang, kan det vara lampligt med en kort introduktion till amnet: Kommunikation och signaler Studier av hur kommunikation mellan djur sker har alltid varit ett av de centrala intressena inom zooekologi. Ma...
General information State: Published Organisations: National Institute of Aquatic Resources, Inst... more General information State: Published Organisations: National Institute of Aquatic Resources, Institute Management, Aarhus University Contributors: Andrusaitis, A., Cox, D., Dosdat, A., Emeis, K., Harms, J., Heral, M., Herrmann, P., ten Hoopen, F., Jennings, S., Johannesson, K., Kononen, K., Köster, F., Laamanen, M., Niilonen, T., Ollikainen, M., Raaska, L., Riemann, B., Sirola, M., Stuefer, J., Svensson, M., Wolf, U. Number of pages: 59 Publication date: 2016
Managing Forest Ecosystems, 2002
The Royal Forester A. D. Israel Strom made the statement cited above in his 1822 book ”Forslag ti... more The Royal Forester A. D. Israel Strom made the statement cited above in his 1822 book ”Forslag till en Forbattrad Skogshushallning i Sverige” (A Proposal for Improved Forest Husbandry in Sweden), which was the main textbook on the subject in Sweden for almost a century. He was uncritically in favour of systematic clear-felling and the development of single aged stands. Israel Strom and his followers taught and defended clear-cutting in an era in which unregulated forest use was common. They rejected the method of selective use and of tree and branch harvesting practiced in Germany and in France. During the period since 1800 a number of different periods in south Swedish forestry can be identified, before 1820 natural householding was practiced, where forest were not industrially used in any significant degree, except in the mining areas in Bergslagen. During the period of 1820–1890, the influence of the Royal forester Israel af Strom was felt, leading to ordered clear-cutting systems, and the development of forest yield tables, production planning and growth promotion systems. In the period 1890–1910 much open land was replanted, due to a perceived lack of forests. During 1905 the first Swedish forest management law was enacted, stipulating the requirements placed on forest regeneration (Skogen-Sveriges Nationalatlas 1990).
Managing Forest Ecosystems, 2002
Managing Forest Ecosystems, 2002
Environmental Modelling & Software, 2009
Integrated Assessment and Modelling (IAM) provides an interdisciplinary approach to support ex-an... more Integrated Assessment and Modelling (IAM) provides an interdisciplinary approach to support ex-ante decision-making by combining quantitative models representing different systems and scales into a framework for integrated assessment. Scenarios in IAM are developed in the interaction between scientists and stakeholders to explore possible pathways of future development. As IAM typically combines models from different disciplines, there is a clear need for a consistent definition and implementation of ...
SEAMLESS integrated project aims at developing an integrated framework that allows exante assessm... more SEAMLESS integrated project aims at developing an integrated framework that allows exante assessment of agricultural and environmental policies and technological innovations. The framework will have multi-scale capabilities ranging from field and farm to the EU25 and globe; it will be generic, modular and open and using state-of-the art software. The project is carried out by a consortium of 30 partners, led by Wageningen University (NL).
Sustainable issues need to be investigated on both spatial and temporal scales. Scale level inter... more Sustainable issues need to be investigated on both spatial and temporal scales. Scale level interactions in different societal sectors suggest that the sustainability concept is ranging depending on the observed time scale. A western household system has an expected duration of 50 years. The sustainability time perspective is thus limited to this period, as since households do not plan generations ahead. Lifestyle patterns, including “ecological living” is influenced by several factors, mainly living and consumption. Dynamic simulation can identify important components of a lifestyle that maintain the highest Ecological Footprint value through time. Ecological footprints are calculated by converting the living and consumption to corresponding ecosystems areas required to support the production of the needed material. System analysis was used to simulate development of the ecological footprint over time of two lifestyles from two different townships in southern Sweden; an ecological ...
Geophysical Journal International, 2011
The aim of this paper is to present an alternative method for the analysis of resistivity data. T... more The aim of this paper is to present an alternative method for the analysis of resistivity data. The methodology was developed during a study to evaluate if electrical resistivity can be used as a tool for analysing subsurface gas dynamics and gas emissions from landfills. The main assumption of this study was that variations in time of resistivity data correspond to variations in the relative amount of gas and water in the soil pores. Field measurements of electrical resistivity, static chamber gas flux and weather data were collected at a landfill in Helsingborg, Sweden. The resistivity survey arrangement consisted of nine lines each with 21 electrodes in an investigation area of 16 ×20 m. The ABEM Lund Imaging System provided vertical and horizontal resistivity profiles every second hour. The data were inverted in Res3Dinv using L 1norm-based optimization method with a standard least-squares formulation. Each horizontal soil layer was then represented as a linear interpolated raster model. Different areas underneath the gas flux measurement points were defined in the resistivity model of the uppermost soil layer, and the vertical extension of the zones could be followed at greater depths in deeper layer models. The average resistivity values of the defined areas were calculated and plotted on a time axis, to provide graphs of the variation in resistivity with time in a specific section of the ground. Residual variation of resistivity was calculated by subtracting the resistivity variations caused by the diurnal temperature variations from the measured resistivity data. The resulting residual resistivity graphs were compared with field data of soil moisture, precipitation, soil temperature and methane flux. The results of the study were qualitative, but promising indications of relationships between electrical resistivity and variations in the relative amount of gas and water in the soil pores were found. Even though more research and better data quality is necessary for verification of the results presented here, we conclude that this alternative methodology of working with resistivity data seems to be a valuable and flexible tool for this application.