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Why do species live where they live? What determines the abundance and diversity of species in a given area? What role do species play in the functioning of entire ecosystems? All of these questions share a single core concept-the ecological niche. Although the niche concept has fallen into disfavor among ecologists in recent years, Jonathan M. Chase and Mathew A. Leibold argue that the niche is an ideal tool with which to unify disparate research and theoretical approaches in contemporary ecology. Chase and Leibold define the niche as including both what an organism needs from its environment and how that organism's activities shape its environment. Drawing on the theory of consumer-resource interactions, as well as its graphical analysis, they develop a framework for understanding niches that is flexible enough to include a variety of small- and large-scale processes, from resource competition, predation, and stress to community structure, biodiversity, and ecosystem function. Chase and Leibold's synthetic approach will interest ecologists from a wide range of subdisciplines.

Niche (Ecology) --- ecology, ecological, biology, biological, scientists, integrative, evolution, evolutionary, species, diversity, ecosystems, environment, consumer-resource, competition, biodiversity, history, context, purpose, variability, sorting, communities, relationships, life processes, adaptations, development, cooperation, natural science.

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This special issue provides a collection of 15 papers with modern theories and applications for circular economy, engineering projects, entrepreneurship models, and investor decisions. After the commencing review on Occupational Health and Safety Management-Systems Standards, follow papers which can be classified into four categories which cover the overall scope of special issue. The first category includes papers regarding the micro-level of circular economy. This means case studies in firm-level which implement different techniques to achieve sustainable development and circular economy goals. The findings reveal interesting achievements which are associated with cultural characteristics of the countries these case studies have been conducted. The second category of papers refers to the meso-level of circular economy where firms cooperate with each other by exchanging byproducts and organizing common operational procedures and routines to address environmental problems. The findings suggest assessment information technology tools to support industrial symbiosis among European firms. The next body of literature encompasses macro-level where circular economy techniques are implemented at a country level. Findings suggest methodologies for implementing and tracking circular economy in cities. Finally, a number of papers are included that focus on advanced engineering techniques. These techniques are useful tools for achieving circular economy and sustainability.

optimal project profitability --- social capital --- risk assessment --- Life cycle assessment (LCA) --- corporate philanthropy --- Ensemble Empirical Mode Decomposition --- steel production --- adaptation --- Value-at-Risk --- construction delay --- sustainable economy --- Project Definition Rating Index --- circular city --- piping construction --- transport planning --- rule-based systems --- resource competition --- traffic congestion --- smart governance --- Management Standards --- value of travel time savings --- climate change --- Fuzzy TOPSIS --- manufacturing firms --- construction safety --- action theory --- sustainable city --- SME --- stochastic simulation --- Theory of Inventive Problem Solving --- indicators --- sustainability --- urbanization --- prefabrication housing production --- pollution impact --- sustainable development --- cost prediction of substation project --- buffer management --- circular economy --- drivers --- Occupational Health and Safety (OHS) --- smart city --- CCPM --- research and innovation projects --- probabilistic alternative approach --- Industrial symbiosis --- cost benefit analysis --- investments --- solar thermal collectors --- Support Vector Machines --- social network --- emergy analysis --- IT tools --- China --- sources of funding --- Cuckoo Search --- strategic management --- photovoltaics --- material procurement management --- PRAT method --- PERT/CPM --- fuzzy logic --- renewable energy systems --- carbon footprint --- transport project evaluation --- framework --- planning and control --- political connections --- critical success factors --- information transfer --- social network centrality --- resource consumption

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As a dynamic interface between agriculture and forestry, agroforestry has only recently been formally recognized as a relevant part of land use with ‘trees outside forest’ in important parts of the world—but not everywhere yet. The Sustainable Development Goals have called attention to the need for the multifunctionality of landscapes that simultaneously contribute to multiple goals. In the UN decade of landscape restoration, as well as in response to the climate change urgency and biodiversity extinction crisis, an increase in global tree cover is widely seen as desirable, but its management by farmers or forest managers remains contested. Agroforestry research relates tree–soil–crop–livestock interactions at the plot level with landscape-level analysis of social-ecological systems and efforts to transcend the historical dichotomy between forest and agriculture as separate policy domains. An ‘ecosystem services’ perspective quantifies land productivity, flows of water, net greenhouse gas emissions, and biodiversity conservation, and combines an ‘actor’ perspective (farmer, landscape manager) with that of ‘downstream’ stakeholders (in the same watershed, ecologically conscious consumers elsewhere, global citizens) and higher-level regulators designing land-use policies and spatial zoning.

Research & information: general --- carbon storage --- cacao agroforestry --- farmer tree preference --- utility value --- entrainment --- erosion --- forest conversion --- overland flow --- soil macroporosity --- throughfall --- water balance --- boundary work --- ecohydrology --- forest–water–people nexus --- landscape approach --- participatory methods --- scenario evaluation --- social-ecological systems --- tropical forests --- assisted natural regeneration (ANR) --- co-investment --- ecosystem services --- environmental stewardship --- equity --- forest and landscape restoration (FLR) --- rights-based approach --- tree planting --- water --- coffee --- fruit trees --- index of root anchoring --- slope stability --- soil shear strength --- root length density --- root tensile strength --- agroforestry --- carbon sequestration --- climate change mitigation --- grazing management --- land restoration --- nationally determined contribution --- silvopastoral --- tree cover --- cocoa agroforestry --- climate adaptation --- soil restoration --- soil organic carbon --- soil macro-porosity --- soil water availability --- inceptisols --- Fraxinus dimorpha --- soil chemical characteristics --- mycorrhizal attributes --- traditional ecological knowledge --- anastomosis --- agroforest --- silvopasture --- economics --- financial analysis --- carbon payment --- Peru --- innovation transfer --- trimming --- intention --- participatory and integrative research-extension --- stakeholders --- adaptation --- Kisumu --- Bungoma --- payment for ecosystem services --- village savings and loan associations --- fruit tree-based agroforestry --- economic benefits --- farmer perspectives --- resource competition --- systems improvement --- uptake and expansion --- cost-benefit analysis --- landscape restoration --- global --- stocktake --- agroforestry coffee --- shade tree species --- pairwise ranking --- Vietnam --- trees on farm --- options by context --- on-farm planned comparison --- tree seedling survival --- agriculture sector --- cost efficiency --- land suitability --- potential expansion areas --- representative concentration pathway --- cocoa --- Java --- livelihoods --- rural–urban --- remittances --- returning migrants --- Sumatra --- Sulawesi --- certification --- deforestation --- palm oil --- forest classification --- Jambi --- legality --- independent smallholders --- agroforestry concessions --- West Kalimantan --- land-use change --- belowground biodiversity --- soil engineers --- Pontoscolex corethrurus --- natural habitats --- planted forest --- artesian wells --- Oryza --- paddy cultivation --- restoration --- rodents --- sustainable intensification --- Mount Bromo-Tengger --- coinvestment --- instrumental values --- landscape --- relational values --- social–ecological systems --- stewardship --- sustainable development goals (SDGs) --- trees --- n/a --- forest-water-people nexus --- rural-urban

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As a dynamic interface between agriculture and forestry, agroforestry has only recently been formally recognized as a relevant part of land use with ‘trees outside forest’ in important parts of the world—but not everywhere yet. The Sustainable Development Goals have called attention to the need for the multifunctionality of landscapes that simultaneously contribute to multiple goals. In the UN decade of landscape restoration, as well as in response to the climate change urgency and biodiversity extinction crisis, an increase in global tree cover is widely seen as desirable, but its management by farmers or forest managers remains contested. Agroforestry research relates tree–soil–crop–livestock interactions at the plot level with landscape-level analysis of social-ecological systems and efforts to transcend the historical dichotomy between forest and agriculture as separate policy domains. An ‘ecosystem services’ perspective quantifies land productivity, flows of water, net greenhouse gas emissions, and biodiversity conservation, and combines an ‘actor’ perspective (farmer, landscape manager) with that of ‘downstream’ stakeholders (in the same watershed, ecologically conscious consumers elsewhere, global citizens) and higher-level regulators designing land-use policies and spatial zoning.

Research & information: general --- carbon storage --- cacao agroforestry --- farmer tree preference --- utility value --- entrainment --- erosion --- forest conversion --- overland flow --- soil macroporosity --- throughfall --- water balance --- boundary work --- ecohydrology --- forest-water-people nexus --- landscape approach --- participatory methods --- scenario evaluation --- social-ecological systems --- tropical forests --- assisted natural regeneration (ANR) --- co-investment --- ecosystem services --- environmental stewardship --- equity --- forest and landscape restoration (FLR) --- rights-based approach --- tree planting --- water --- coffee --- fruit trees --- index of root anchoring --- slope stability --- soil shear strength --- root length density --- root tensile strength --- agroforestry --- carbon sequestration --- climate change mitigation --- grazing management --- land restoration --- nationally determined contribution --- silvopastoral --- tree cover --- cocoa agroforestry --- climate adaptation --- soil restoration --- soil organic carbon --- soil macro-porosity --- soil water availability --- inceptisols --- Fraxinus dimorpha --- soil chemical characteristics --- mycorrhizal attributes --- traditional ecological knowledge --- anastomosis --- agroforest --- silvopasture --- economics --- financial analysis --- carbon payment --- Peru --- innovation transfer --- trimming --- intention --- participatory and integrative research-extension --- stakeholders --- adaptation --- Kisumu --- Bungoma --- payment for ecosystem services --- village savings and loan associations --- fruit tree-based agroforestry --- economic benefits --- farmer perspectives --- resource competition --- systems improvement --- uptake and expansion --- cost-benefit analysis --- landscape restoration --- global --- stocktake --- agroforestry coffee --- shade tree species --- pairwise ranking --- Vietnam --- trees on farm --- options by context --- on-farm planned comparison --- tree seedling survival --- agriculture sector --- cost efficiency --- land suitability --- potential expansion areas --- representative concentration pathway --- cocoa --- Java --- livelihoods --- rural-urban --- remittances --- returning migrants --- Sumatra --- Sulawesi --- certification --- deforestation --- palm oil --- forest classification --- Jambi --- legality --- independent smallholders --- agroforestry concessions --- West Kalimantan --- land-use change --- belowground biodiversity --- soil engineers --- Pontoscolex corethrurus --- natural habitats --- planted forest --- artesian wells --- Oryza --- paddy cultivation --- restoration --- rodents --- sustainable intensification --- Mount Bromo-Tengger --- coinvestment --- instrumental values --- landscape --- relational values --- stewardship --- sustainable development goals (SDGs) --- trees