Urban gardens are an integral part of urban agricultural systems, contributing to ecosystem services, biodiversity and human wellbeing. These systems occur at fine scales, can be highly complex and therefore offer the opportunity to test mechanisms of ecological patterns and processes. The capacity to confidently characterize urban gardens and their land uses is still lacking, while it could provide the basis for assessing ecosystem service provision. Land classifications from remote sensing platforms are common at the landscape scale, but imagery often lacks the resolution required to map differences in land use of fine-scale systems such as urban gardens. Here, we present a workflow to model and map land use in urban gardens using imagery from an unoccupied aerial vehicle (UAV) and machine learning. Due to high resolutions (<5 cm) from image acquisition at low altitudes, UAV remote sensing is better suited to characterize urban land use. We mapped six common land uses in 10 urban community gardens, exhibiting distinct spatial arrangements. Our models had good predictive performance, reaching 80% overall prediction accuracy in independent validation and up to 95% when assessing model performance per cover class. Extracting spatial metrics from these land use classifications, we found that at the garden and plot scale, plant species richness can be estimated by the total area and patchiness of crops. Land use classifications like these can offer an accessible tool to assess complex urban habitats and justify the importance of urban agriculture as a service-providing system, contributing to the sustainability and livability of cities.
{"title":"Application of UAV remote sensing and machine learning to model and map land use in urban gardens","authors":"Benjamin Wagner, Monika H. Egerer","doi":"10.1093/jue/juac008","DOIUrl":"https://doi.org/10.1093/jue/juac008","url":null,"abstract":"Urban gardens are an integral part of urban agricultural systems, contributing to ecosystem services, biodiversity and human wellbeing. These systems occur at fine scales, can be highly complex and therefore offer the opportunity to test mechanisms of ecological patterns and processes. The capacity to confidently characterize urban gardens and their land uses is still lacking, while it could provide the basis for assessing ecosystem service provision. Land classifications from remote sensing platforms are common at the landscape scale, but imagery often lacks the resolution required to map differences in land use of fine-scale systems such as urban gardens. Here, we present a workflow to model and map land use in urban gardens using imagery from an unoccupied aerial vehicle (UAV) and machine learning. Due to high resolutions (<5 cm) from image acquisition at low altitudes, UAV remote sensing is better suited to characterize urban land use. We mapped six common land uses in 10 urban community gardens, exhibiting distinct spatial arrangements. Our models had good predictive performance, reaching 80% overall prediction accuracy in independent validation and up to 95% when assessing model performance per cover class. Extracting spatial metrics from these land use classifications, we found that at the garden and plot scale, plant species richness can be estimated by the total area and patchiness of crops. Land use classifications like these can offer an accessible tool to assess complex urban habitats and justify the importance of urban agriculture as a service-providing system, contributing to the sustainability and livability of cities.","PeriodicalId":37022,"journal":{"name":"Journal of Urban Ecology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61021996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Given the increasing relevance of cities in the global agenda, we examine the voluntary local reports from six northern and southern cities around the world to understand their approach to the 2030 Agenda for sustainable development. We examine not only the framework but also the content of the reports to identify the differences in reporting on sustainable development goals (SDGs) and the factors that may explain why these cities have voluntarily submitted their reports. The research has revealed a wide diversity in the structure and content of the voluntary local reports, demonstrating that there was little to no institutional framework used to submit and compile the reports. Although the reports of northern cities tend to align with previous strategies for the SDGs, the implementation of the 2030 Agenda in southern cities has had a more significant impact on the adoption of monitoring and evaluation mechanisms at the local level. We have found that both international bodies and national policies have an influence on the development of sustainable practices at the local level. Our analysis also indicates that all cities have some sort of international exposure either through their participation in transnational municipal networks or through their collaboration with international organizations, especially in southern cities, which can explain why these cities (and not others) are more active in the adoption of SDGs at the local level and in the submission of voluntary reports.
{"title":"Local voluntary reports: the implementation of sustainable development goals in northern and southern cities","authors":"Xira Ruiz-Campillo, Samanta Rosas Nieva","doi":"10.1093/jue/juac013","DOIUrl":"https://doi.org/10.1093/jue/juac013","url":null,"abstract":"Given the increasing relevance of cities in the global agenda, we examine the voluntary local reports from six northern and southern cities around the world to understand their approach to the 2030 Agenda for sustainable development. We examine not only the framework but also the content of the reports to identify the differences in reporting on sustainable development goals (SDGs) and the factors that may explain why these cities have voluntarily submitted their reports. The research has revealed a wide diversity in the structure and content of the voluntary local reports, demonstrating that there was little to no institutional framework used to submit and compile the reports. Although the reports of northern cities tend to align with previous strategies for the SDGs, the implementation of the 2030 Agenda in southern cities has had a more significant impact on the adoption of monitoring and evaluation mechanisms at the local level. We have found that both international bodies and national policies have an influence on the development of sustainable practices at the local level. Our analysis also indicates that all cities have some sort of international exposure either through their participation in transnational municipal networks or through their collaboration with international organizations, especially in southern cities, which can explain why these cities (and not others) are more active in the adoption of SDGs at the local level and in the submission of voluntary reports.","PeriodicalId":37022,"journal":{"name":"Journal of Urban Ecology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61022135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Information on how urban areas affect bird communities during winter in the boreal region is still scarce. With the aim of assessing such role of the urban habitats on over-wintering boreal birds, I focused on a city-wide approach in the city of Lahti (southern Finland) and two nearby forests (as controls). Point count surveys were conducted in 157 sites within the city and 30 in the control forests. In order to achieve comparable sets of data to contrast with the reference forests, I randomly selected five 30 point count sub-samples from the Lahti city-wide survey. Species richness was, in general, higher in the sub-samples from the city of Lahti. Such pattern did not show relationship with the built cover of the studied sites. Bird abundances were 3.3–5.9 times higher in the urban sub-samples when contrasted with the forest ones. Although results of this study are limited to a single city and consider one wintering season, they clearly illustrate the important role of urban systems as habitat for wintering birds in boreal systems.
{"title":"Winter thriving: on the role of a boreal city on bird communities","authors":"I. MacGregor‐Fors","doi":"10.1093/jue/juac010","DOIUrl":"https://doi.org/10.1093/jue/juac010","url":null,"abstract":"Information on how urban areas affect bird communities during winter in the boreal region is still scarce. With the aim of assessing such role of the urban habitats on over-wintering boreal birds, I focused on a city-wide approach in the city of Lahti (southern Finland) and two nearby forests (as controls). Point count surveys were conducted in 157 sites within the city and 30 in the control forests. In order to achieve comparable sets of data to contrast with the reference forests, I randomly selected five 30 point count sub-samples from the Lahti city-wide survey. Species richness was, in general, higher in the sub-samples from the city of Lahti. Such pattern did not show relationship with the built cover of the studied sites. Bird abundances were 3.3–5.9 times higher in the urban sub-samples when contrasted with the forest ones. Although results of this study are limited to a single city and consider one wintering season, they clearly illustrate the important role of urban systems as habitat for wintering birds in boreal systems.","PeriodicalId":37022,"journal":{"name":"Journal of Urban Ecology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61022053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Margaret Cathcart-James, Christopher W. Foster, B. J. Pickles
Biodiversity is fundamental to the provision of ecosystem services that benefit urban communities, yet one type of green space is largely overlooked in ecological research and local governance: urban burial grounds. Their longevity, profound importance to society, and ubiquitous nature, provide unique opportunities for urban biodiversity. However, there has been little scientific exploration of their potentials. To quantify biodiversity in urban burial grounds, a low impact methodology for the capture of flying beetles was developed and deployed at 20 sites in southern England. To the authors’ knowledge this work represents the largest sampling of burial grounds in a single study. We used Generalized linear Mixed Models to examine the influence of weather, local demographic variables, urban landscape and burial ground vegetation management on the abundance of flying beetles. We found significant variability in beetle assemblages over time and between burial grounds. Burial ground age was not significantly associated with flying beetle abundance, challenging long-standing assumptions about older burial grounds being more valuable for biodiversity. Increasing area of domestic gardens and hedgerows in the surrounding urban landscape was positively associated with beetle abundance, whereas the most significant negative association was with burial ground size. Additionally, management of burial grounds significantly influenced beetle abundance: more stringent regimes typically resulted in lower abundance, but sites with horticultural landscaping or biodiversity-focused regimes exhibited higher abundances.
{"title":"Challenging assumptions about burial ground biodiversity using flying beetles as indicators in urban areas","authors":"Margaret Cathcart-James, Christopher W. Foster, B. J. Pickles","doi":"10.1093/jue/juac024","DOIUrl":"https://doi.org/10.1093/jue/juac024","url":null,"abstract":"Biodiversity is fundamental to the provision of ecosystem services that benefit urban communities, yet one type of green space is largely overlooked in ecological research and local governance: urban burial grounds. Their longevity, profound importance to society, and ubiquitous nature, provide unique opportunities for urban biodiversity. However, there has been little scientific exploration of their potentials. To quantify biodiversity in urban burial grounds, a low impact methodology for the capture of flying beetles was developed and deployed at 20 sites in southern England. To the authors’ knowledge this work represents the largest sampling of burial grounds in a single study. We used Generalized linear Mixed Models to examine the influence of weather, local demographic variables, urban landscape and burial ground vegetation management on the abundance of flying beetles. We found significant variability in beetle assemblages over time and between burial grounds. Burial ground age was not significantly associated with flying beetle abundance, challenging long-standing assumptions about older burial grounds being more valuable for biodiversity. Increasing area of domestic gardens and hedgerows in the surrounding urban landscape was positively associated with beetle abundance, whereas the most significant negative association was with burial ground size. Additionally, management of burial grounds significantly influenced beetle abundance: more stringent regimes typically resulted in lower abundance, but sites with horticultural landscaping or biodiversity-focused regimes exhibited higher abundances.","PeriodicalId":37022,"journal":{"name":"Journal of Urban Ecology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61022521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Recent human-induced transformations to the environment are significantly impacting wild animal populations. Whereas some animals thrive due to these changes, others are being extinguished. Many studies have attempted to identify behavioural traits (e.g. personality, diet versatility, cognition) that allow some animals to succeed in human-dominated landscapes, but few have studied multiple traits or environmental contexts concurrently, despite the fact that different environments may require different types of behavioural performance. We presented house finches (Haemorhous mexicanus) captured from urban, suburban, and rural sites with two different environmental problems to solve (escaping from a confinement and finding food in multiple feeding structures) and measured the success and speed of solving the challenge as well as activity levels and stress behaviours of the birds. We found that urban birds were better at solving the escape challenge, but there was no difference in finding a hidden food source. In addition, we found that birds who solved the escape challenge were more active than those who did not solve this problem, although we observed no such behavioural difference in the food challenge. These results indicate that, because problem-solving challenges can vary across environments, certain types of innovation may be prioritized over others in urban-dwelling species.
{"title":"Context-dependent variation in innovation as a function of urbanization in a songbird","authors":"M. Weaver, K. McGraw","doi":"10.1093/jue/juac029","DOIUrl":"https://doi.org/10.1093/jue/juac029","url":null,"abstract":"Recent human-induced transformations to the environment are significantly impacting wild animal populations. Whereas some animals thrive due to these changes, others are being extinguished. Many studies have attempted to identify behavioural traits (e.g. personality, diet versatility, cognition) that allow some animals to succeed in human-dominated landscapes, but few have studied multiple traits or environmental contexts concurrently, despite the fact that different environments may require different types of behavioural performance. We presented house finches (Haemorhous mexicanus) captured from urban, suburban, and rural sites with two different environmental problems to solve (escaping from a confinement and finding food in multiple feeding structures) and measured the success and speed of solving the challenge as well as activity levels and stress behaviours of the birds. We found that urban birds were better at solving the escape challenge, but there was no difference in finding a hidden food source. In addition, we found that birds who solved the escape challenge were more active than those who did not solve this problem, although we observed no such behavioural difference in the food challenge. These results indicate that, because problem-solving challenges can vary across environments, certain types of innovation may be prioritized over others in urban-dwelling species.","PeriodicalId":37022,"journal":{"name":"Journal of Urban Ecology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61023899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
G. V. Ringani, R. S. Julius, C. Chimimba, C. Pirk, T. Zengeya
Three species of Rattus, Norway rat (R. norvergicus), black rat (R. rattus) and Asian house rat (R. tanezumi) are currently known to occur in South Africa. The latter two species are cryptic and form part of the Rattus rattus species complex. Historically, R. norvegicus has been reported to occur along the coast and in urban centres, R. rattus is widespread in most urban areas, except in the drier areas, while R. tanezumi was only recorded to occur in the country (and Africa) ca. 15 years ago, and its distribution remains unknown. The aim of this study was to predict the potential distribution of R. tanezumi in South Africa and assess how it overlaps with that of R. norvegicus and R. rattus using species distribution modelling. Rattus tanezumi was predicted to mainly occur in most inland urban areas and along the coast. The distribution of R. rattus was as expected, in contrast, the predicted range of R. norvegicus was not restricted to the coast but also included inland urban areas. All three species showed broad potential distributional ranges that overlapped extensively indicating that their establishment and spread may be influenced by similar factors such as proximity to urban areas and a wet and moderate climate. These results allow insights into assessing their risk of establishment and for formulating appropriate intervention strategies for their management and control.
{"title":"Predicting the potential distribution of a previously undetected cryptic invasive synanthropic Asian house rat (Rattus tanezumi) in South Africa","authors":"G. V. Ringani, R. S. Julius, C. Chimimba, C. Pirk, T. Zengeya","doi":"10.1093/jue/juac005","DOIUrl":"https://doi.org/10.1093/jue/juac005","url":null,"abstract":"Three species of Rattus, Norway rat (R. norvergicus), black rat (R. rattus) and Asian house rat (R. tanezumi) are currently known to occur in South Africa. The latter two species are cryptic and form part of the Rattus rattus species complex. Historically, R. norvegicus has been reported to occur along the coast and in urban centres, R. rattus is widespread in most urban areas, except in the drier areas, while R. tanezumi was only recorded to occur in the country (and Africa) ca. 15 years ago, and its distribution remains unknown. The aim of this study was to predict the potential distribution of R. tanezumi in South Africa and assess how it overlaps with that of R. norvegicus and R. rattus using species distribution modelling. Rattus tanezumi was predicted to mainly occur in most inland urban areas and along the coast. The distribution of R. rattus was as expected, in contrast, the predicted range of R. norvegicus was not restricted to the coast but also included inland urban areas. All three species showed broad potential distributional ranges that overlapped extensively indicating that their establishment and spread may be influenced by similar factors such as proximity to urban areas and a wet and moderate climate. These results allow insights into assessing their risk of establishment and for formulating appropriate intervention strategies for their management and control.","PeriodicalId":37022,"journal":{"name":"Journal of Urban Ecology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61021554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Urban wildlife faces a great variety of human-induced habitat alterations, among others changes in resource availability and composition, often resulting in serious declines in biodiversity. Nevertheless, Eurasian red squirrels (Sciurus vulgaris) occur in high densities in urban areas and seem to benefit from supplementary feeding. However, we still lack knowledge about consequences of urbanisation on mammalian foraging behaviour and nutrient intake. Thus, we investigated body mass, food choice and diet composition in squirrels from an urban core area versus a forest population in a cafeteria experiment. Urban individuals were lower in initial body mass and condition, but consumed significantly more g and kJ per day and significantly gained weight over the course of the experiment (around 2 weeks); nevertheless, the difference in body mass and condition persisted. All squirrels preferred hazelnuts, but urban squirrels had a wider dietary range and consumed more non-natural food items. Both groups prioritised fat and there was no difference in protein intake. Urban squirrels though had a significantly higher sugar intake, mainly by eating biscuits. Our results demonstrate clear effects of urbanisation on foraging behaviour and preferences, which has the potential for nutritional mismatch or negative side effects due to consumption of non-natural food items. Our findings show that highly supplemented urban core fragments might not serve as adequate refuge for wildlife.
{"title":"Sugar addicted in the city: impact of urbanisation on food choice and diet composition of the Eurasian red squirrel (Sciurus vulgaris)","authors":"Bianca Wist, C. Stolter, K. Dausmann","doi":"10.1093/jue/juac012","DOIUrl":"https://doi.org/10.1093/jue/juac012","url":null,"abstract":"Urban wildlife faces a great variety of human-induced habitat alterations, among others changes in resource availability and composition, often resulting in serious declines in biodiversity. Nevertheless, Eurasian red squirrels (Sciurus vulgaris) occur in high densities in urban areas and seem to benefit from supplementary feeding. However, we still lack knowledge about consequences of urbanisation on mammalian foraging behaviour and nutrient intake. Thus, we investigated body mass, food choice and diet composition in squirrels from an urban core area versus a forest population in a cafeteria experiment. Urban individuals were lower in initial body mass and condition, but consumed significantly more g and kJ per day and significantly gained weight over the course of the experiment (around 2 weeks); nevertheless, the difference in body mass and condition persisted. All squirrels preferred hazelnuts, but urban squirrels had a wider dietary range and consumed more non-natural food items. Both groups prioritised fat and there was no difference in protein intake. Urban squirrels though had a significantly higher sugar intake, mainly by eating biscuits. Our results demonstrate clear effects of urbanisation on foraging behaviour and preferences, which has the potential for nutritional mismatch or negative side effects due to consumption of non-natural food items. Our findings show that highly supplemented urban core fragments might not serve as adequate refuge for wildlife.","PeriodicalId":37022,"journal":{"name":"Journal of Urban Ecology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61022111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Multiple international stakeholders emphasise the important role of small- to medium-sized enterprises (SMEs) in achieving the sustainable development goals (SDG). SMEs make up more than 99% of companies in Europe, and holds a potential to promote social and environmental responsibility. However, there is no ‘one size fits all’ when it comes to the incorporation of the SDGs. In this study; we identify five main approaches based on a literature review including (i) rainbow washing, (ii) supporting ‘business as usual’, (iii) adding new initiatives/strategies, (iv) philanthropy and (v) strategic use in core businesses. These approaches are categorised based on their contribution to achieving the SDGs as well as the benefits for the company in question. We performed a case study of six SMEs in Northern Jutland, Denmark, which revealed, that most SMEs work with the SDGs in less proactive and ambitious ways, leaving a gap between the role they have been assigned and their current practices. To investigate this gap further, our case study combined with the literature review has helped identify factors influencing the SMEs choice of approach. These include both negative (uncertainty about the SDGs prospective role, lack of resources and low demand for SDG compliance) and positive (taking responsibility, social license to operate, communication and inspiration) factors. The negative influencing factors are particularly interlinked which is caused by inadequacy in resources, knowledge and qualifications. This indicates that SMEs cannot single-handedly implement the SDGs in a way that enables achievement of the 2030 Agenda, thus external guidance is needed.
{"title":"Incorporating the sustainable development goals in small- to medium-sized enterprises","authors":"Sofie Nygaard, Alberte R Kokholm, R. D. Huulgaard","doi":"10.1093/jue/juac022","DOIUrl":"https://doi.org/10.1093/jue/juac022","url":null,"abstract":"Multiple international stakeholders emphasise the important role of small- to medium-sized enterprises (SMEs) in achieving the sustainable development goals (SDG). SMEs make up more than 99% of companies in Europe, and holds a potential to promote social and environmental responsibility. However, there is no ‘one size fits all’ when it comes to the incorporation of the SDGs. In this study; we identify five main approaches based on a literature review including (i) rainbow washing, (ii) supporting ‘business as usual’, (iii) adding new initiatives/strategies, (iv) philanthropy and (v) strategic use in core businesses. These approaches are categorised based on their contribution to achieving the SDGs as well as the benefits for the company in question. We performed a case study of six SMEs in Northern Jutland, Denmark, which revealed, that most SMEs work with the SDGs in less proactive and ambitious ways, leaving a gap between the role they have been assigned and their current practices. To investigate this gap further, our case study combined with the literature review has helped identify factors influencing the SMEs choice of approach. These include both negative (uncertainty about the SDGs prospective role, lack of resources and low demand for SDG compliance) and positive (taking responsibility, social license to operate, communication and inspiration) factors. The negative influencing factors are particularly interlinked which is caused by inadequacy in resources, knowledge and qualifications. This indicates that SMEs cannot single-handedly implement the SDGs in a way that enables achievement of the 2030 Agenda, thus external guidance is needed.","PeriodicalId":37022,"journal":{"name":"Journal of Urban Ecology","volume":"142 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61022315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Matthew A. Borden, Nicole D. Benda, E. Bean, Adam G Dale
Residential areas are the most rapidly expanding land use type in the southeastern USA. Residential development impairs soil functions primarily through compaction and the removal or burial of topsoil and natural vegetation, which reduces water infiltration and retention, root penetration, and plant establishment. Plant stress reduces plant-derived ecosystem services and increases vulnerability to pests, often leading to supplemental management inputs in the form of irrigation, fertilizers, pesticides and labor. Soil-dwelling invertebrates, including detritivores and natural enemies of pests, drive valuable ecosystem functions that facilitate plant establishment and reduce maintenance inputs. Although poorly understood, soil disturbance during residential development likely disturbs these communities and reduces the services provided by soil-dwelling invertebrates. Here, we compare the effects of two soil compaction mitigation techniques, tillage with and without compost incorporation, on invertebrate communities and the services they provide over 2 years following residential development. We focus on the relationships between detritivores and detritus decomposition rates, entomopathogenic nematodes and the activity density of a key turfgrass pest and other arthropod herbivores and predators. We found that soil mitigation had no detectable benefit for epigeal arthropods within 1 year after disturbance, but that compost-amended soils supported greater arthropod richness and predator activity density than unmitigated soils in the second year after disturbance. In contrast, we found reduced insect-parasitic nematode activity associated with compost amendment. All taxa increased in abundance with time after development. These results can inform more sustainable residential development and landscape maintenance practices for more biodiverse and functional urban and residential ecosystems.
{"title":"Effects of soil mitigation on lawn-dwelling invertebrates following residential development","authors":"Matthew A. Borden, Nicole D. Benda, E. Bean, Adam G Dale","doi":"10.1093/jue/juac025","DOIUrl":"https://doi.org/10.1093/jue/juac025","url":null,"abstract":"Residential areas are the most rapidly expanding land use type in the southeastern USA. Residential development impairs soil functions primarily through compaction and the removal or burial of topsoil and natural vegetation, which reduces water infiltration and retention, root penetration, and plant establishment. Plant stress reduces plant-derived ecosystem services and increases vulnerability to pests, often leading to supplemental management inputs in the form of irrigation, fertilizers, pesticides and labor. Soil-dwelling invertebrates, including detritivores and natural enemies of pests, drive valuable ecosystem functions that facilitate plant establishment and reduce maintenance inputs. Although poorly understood, soil disturbance during residential development likely disturbs these communities and reduces the services provided by soil-dwelling invertebrates. Here, we compare the effects of two soil compaction mitigation techniques, tillage with and without compost incorporation, on invertebrate communities and the services they provide over 2 years following residential development. We focus on the relationships between detritivores and detritus decomposition rates, entomopathogenic nematodes and the activity density of a key turfgrass pest and other arthropod herbivores and predators. We found that soil mitigation had no detectable benefit for epigeal arthropods within 1 year after disturbance, but that compost-amended soils supported greater arthropod richness and predator activity density than unmitigated soils in the second year after disturbance. In contrast, we found reduced insect-parasitic nematode activity associated with compost amendment. All taxa increased in abundance with time after development. These results can inform more sustainable residential development and landscape maintenance practices for more biodiverse and functional urban and residential ecosystems.","PeriodicalId":37022,"journal":{"name":"Journal of Urban Ecology","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61022624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Urbanization is one of the major causes of biodiversity loss worldwide. Some species are able to adapt to urbanization, whereas others perish. Studies on long-term effects of the impact of urbanization on species diversity and abundance patterns are especially lacking from tropical cities. We seek to assess the relationship between urbanization and species richness of lake-dependent birds in Bangalore, a tropical mega-city in Southern India. We specifically ask: (i) How is bird species richness related to the size of the lake? (ii) How is bird species richness in Bangalore’s lakes related to the degree of urbanization? We used data from 2014 to 2019, collected from eBird—an online database that collates information on bird observations globally. Both lake area and distance from the city centre are correlated to species richness, with larger lakes supporting more bird species. As distance from the city centre increased (i.e. urbanization decreases), bird richness increased. Overall, in the city of Bangalore, migratory birds have declined while many lake-dependent resident birds seem to be increasing over the past 5 years. We hypothesize that birds that roost and nest in trees appear to be increasing. To confirm this, further research taking a trait-based approach is required. Urbanization appears to have species-specific impacts on lake-dependent birds in this tropical city, with certain groups of birds faring better than others. This research adds to the significant paucity of studies of the impact of urbanization on biodiversity in the urban tropics.
{"title":"Relationship between lake area and distance from the city centre on lake-dependent resident and migratory birds in urban Bangalore, a tropical mega-city in Southern India","authors":"Ravi Jambhekar, K. Suryawanshi, H. Nagendra","doi":"10.1093/jue/juab028","DOIUrl":"https://doi.org/10.1093/jue/juab028","url":null,"abstract":"\u0000 Urbanization is one of the major causes of biodiversity loss worldwide. Some species are able to adapt to urbanization, whereas others perish. Studies on long-term effects of the impact of urbanization on species diversity and abundance patterns are especially lacking from tropical cities. We seek to assess the relationship between urbanization and species richness of lake-dependent birds in Bangalore, a tropical mega-city in Southern India. We specifically ask: (i) How is bird species richness related to the size of the lake? (ii) How is bird species richness in Bangalore’s lakes related to the degree of urbanization? We used data from 2014 to 2019, collected from eBird—an online database that collates information on bird observations globally. Both lake area and distance from the city centre are correlated to species richness, with larger lakes supporting more bird species. As distance from the city centre increased (i.e. urbanization decreases), bird richness increased. Overall, in the city of Bangalore, migratory birds have declined while many lake-dependent resident birds seem to be increasing over the past 5 years. We hypothesize that birds that roost and nest in trees appear to be increasing. To confirm this, further research taking a trait-based approach is required. Urbanization appears to have species-specific impacts on lake-dependent birds in this tropical city, with certain groups of birds faring better than others. This research adds to the significant paucity of studies of the impact of urbanization on biodiversity in the urban tropics.","PeriodicalId":37022,"journal":{"name":"Journal of Urban Ecology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48425464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：