Integrated assessment of water conservation practices for sustainable management strategies

Miami-Dade County implemented a series of water conservation programs, which included rebate/exchange incentives to encourage the use of high efficiency aerators (AR), showerheads (SH), toilets (HET) and clothes washers (HEW), to respond to the environmental sustainability issue in urban areas. This study first used panel data analysis of water consumption to evaluate the performance and actual water savings of individual programs. Integrated water demand model has also been developed for incorporating property’s physical characteristics into the water consumption profiles. Life cycle assessment (with emphasis on end-use stage in water system) of water intense appliances was conducted to determine the environmental impacts brought by each practice. Approximately 6 to 10 % of water has been saved in the first and second year of implementation of high efficiency appliances, and with continuing savings in the third and fourth years. Water savings (gallons per household per day) for water efficiency appliances were observed at 28 (11.1%) for SH, 34.7 (13.3%) for HET, and 39.7 (14.5%) for HEW. Furthermore, the estimated contributions of high efficiency appliances for reducing water demand in the integrated water demand model were between 5 and 19% (highest in the AR program). Results indicated that adoption of more than one type of water efficiency appliance could significantly reduce residential water demand. For the sustainable water management strategies, the appropriate water conservation rate was projected to be 1 to 2 million gallons per day (MGD) through 2030. With 2 MGD of water savings, the estimated per capita water use (GPCD) could be reduced from approximately 140 to 122 GPCD. Additional efforts are needed to reduce the water demand to US EPA’s “Water Sense” conservation levels of 70 GPCD by 2030. Life cycle assessment results showed that environmental impacts (water and energy demands and greenhouse gas emissions) from end-use and demand phases are most significant within the water system, particularly due to water heating (73% for clothes washer and 93% for showerhead). Estimations of optimal lifespan for appliances (8 to 21 years) implied that earlier replacement with efficiency models is encouraged in order to minimize the environmental impacts brought by current practice.

Quantifying avian relative abundance and ecosystem service value to identify conservation opportunities in the Midwestern U.S.

Grassland birds are highly imperiled because of historical habitat loss and ongoing conversion of grasslands to agricultural and urban land uses. Therefore, prioritizing and further justifying conservation action in remaining grasslands is critical to protecting what remains. Grassland bird conservation has focused on identifying and protecting large grassland complexes referred to as Grassland Bird Conservation Areas (GBCAs). We identified and classified GBCAs in a region highly impacted by both agricultural and urban land conversion using previously developed methods. Then, we extended the analysis to include estimated relative abundance of five grassland focal species in each GBCA. Models of relative abundance were built using eight years of monitoring data collected by citizen scientists. Finally, we quantified the value of ecosystem services provided by each GBCA. There were nearly 55,000 ha of grassland habitats in the Chicago Metropolitan Region that met GBCA criteria, 33% (18,415 ha) of which were protected. Proportion of abundance in protected versus unprotected areas was similar for Bobolink (Dolichonyx oryzivorus; 46%), Grasshopper Sparrow (Ammodramus savannarum; 52%), and Sedge Wren (Cistothorus platensis; 48%), whereas, Henslow’s Sparrow (Ammodramus henslowii; 75%) had a higher proportion of relative abundance in protected GBCAs and Eastern Meadowlark (Sturnella magna) had lower proportions (37%). GBCAs provisioned just under $900 million annually in ecosystem services, 73% of which is because of flood control. Outputs of this comprehensive approach will inform grassland bird conservation by providing detailed information about the value for birds and people of grassland habitats.

Nature-based solutions to climate change mitigation and adaptation in urban areas: perspectives on indicators, knowledge gaps, barriers, and opportunities for action

Nature-based solutions promoting green and blue urban areas have significant potential to decrease the vulnerability and enhance the resilience of cities in light of climatic change. They can thereby help to mitigate climate change-induced impacts and serve as proactive adaptation options for municipalities. We explore the various contexts in which nature-based solutions are relevant for climate mitigation and adaptation in urban areas, identify indicators for assessing the effectiveness of nature-based solutions and related knowledge gaps. In addition, we explore existing barriers and potential opportunities for increasing the scale and effectiveness of nature-based solution implementation. The results were derived from an inter- and transdisciplinary workshop with experts from research, municipalities, policy, and society. As an outcome of the workshop discussions and building on existing evidence, we highlight three main needs for future science and policy agendas when dealing with nature-based solutions: (i) produce stronger evidence on nature-based solutions for climate change adaptation and mitigation and raise awareness by increasing implementation; (ii) adapt for governance challenges in implementing nature-based solutions by using reflexive approaches, which implies bringing together new networks of society, nature-based solution ambassadors, and practitioners; (iii) consider socio-environmental justice and social cohesion when implementing nature-based solutions by using integrated governance approaches that take into account an integrative and transdisciplinary participation of diverse actors. Taking these needs into account, nature-based solutions can serve as climate mitigation and adaptation tools that produce additional cobenefits for societal well-being, thereby serving as strong investment options for sustainable urban planning.

Key insights for the future of urban ecosystem services research

Understanding the dynamics of urban ecosystem services is a necessary requirement for adequate planning, management, and governance of urban green infrastructure. Through the three-year Urban Biodiversity and Ecosystem Services (URBES) research project, we conducted case study and comparative research on urban biodiversity and ecosystem services across seven cities in Europe and the United States. Reviewing > 50 peer-reviewed publications from the project, we present and discuss seven key insights that reflect cumulative findings from the project as well as the state-of-the-art knowledge in urban ecosystem services research. The insights from our review indicate that cross-sectoral, multiscale, interdisciplinary research is beginning to provide a solid scientific foundation for applying the ecosystem services framework in urban areas and land management. Our review offers a foundation for seeking novel, nature-based solutions to emerging urban challenges such as wicked environmental change issues.

Dingoes at the Doorstep: Home Range Sizes and Activity Patterns of Dingoes and Other Wild Dogs around Urban Areas of North-Eastern Australia

Top-predators around the world are becoming increasingly intertwined with humans, sometimes causing conflict and increasing safety risks in urban areas. In Australia, dingoes and dingo � domestic dog hybrids are common in many urban areas, and pose a variety of human health and safety risks. However, data on urban dingo ecology is scant. We GPS-collared 37 dingoes in north-eastern Australia and continuously monitored them each 30 min for 11–394 days. Most dingoes were nocturnal, with an overall mean home range size of 17.47 km2. Overall mean daily distance travelled was 6.86 km/day. At all times dingoes were within 1000 m of houses and buildings. Home ranges appeared to be constrained to patches of suitable vegetation fragments within and around human habitation. These data can be used to reallocate dingo management effort towards mitigating actual conflicts between humans and dingoes in urban areas.

Urbanization impacts on mammals across urban-forest edges and a predictive model of edge effects

With accelerating rates of urbanization worldwide, a better understanding of ecological processes at the wildland-urban interface is critical to conserve biodiversity. We explored the effects of high and low-density housing developments on forest-dwelling mammals. Based on habitat characteristics, we expected a gradual decline in species abundance across forest-urban edges and an increased decline rate in higher contrast edges. We surveyed arboreal mammals in sites of high and low housing density along 600 m transects that spanned urban areas and areas turn on adjacent native forest. We also surveyed forest controls to test whether edge effects extended beyond our edge transects. We fitted models describing richness, total abundance and individual species abundance. Low-density housing developments provided suitable habitat for most arboreal mammals. In contrast, high-density housing developments had lower species richness, total abundance and individual species abundance, but supported the highest abundances of an urban adapter (Trichosurus vulpecula). We did not find the predicted gradual decline in species abundance. Of four species analysed, three exhibited no response to the proximity of urban boundaries, but spilled over into adjacent urban habitat to differing extents. One species (Petaurus australis) had an extended negative response to urban boundaries, suggesting that urban development has impacts beyond 300 m into adjacent forest. Our empirical work demonstrates that high-density housing developments have negative effects on both community and species level responses, except for one urban adapter. We developed a new predictive model of edge effects based on our results and the literature. To predict animal responses across edges, our framework integrates for first time: (1) habitat quality/preference, (2) species response with the proximity to the adjacent habitat, and (3) spillover extent/sensitivity to adjacent habitat boundaries. This framework will allow scientists, managers and planners better understand and predict both species responses across edges and impacts of development in mosaic landscapes.

Using the historic urban landscape to reimagine Ballarat : the local context

The adoption by UNESCO of the Recommendation on the Historic Urban Landscape (2011) aimed to re-position issues of development and urban heritage conservation, and outlined a way forward based on community-centred processes and the recognition of the dynamic character of urban settlements. Achieving these goals will depend on the development of new methods and processes, and implementation to specific urban contexts. This paper highlights the importance of local government as a location where this international dialogue can be operationalized and further advanced. Reflecting on the theoretical and practical dimensions of adopting a landscape approach to urban planning and conservation by the City of Ballarat (Australia) has allowed some significant potential shifts in heritage practice to be anticipated.

‘On the move’? Maritime heritage and urban redevelopment in Melbourne

This paper explores issues surrounding the conservation and management of Polly Woodside, one of Victoria’s most significant maritime heritage objects. Sold to the National Trust of Australia (Victoria) for restoration in 1968, the ship has been berthed in the historic Duke’s Dock since 1978. Through various incarnations, the ship and associated museum have been a key feature of the Melbourne ‘riverscape’, and a major tourist attraction, ever since. The paper briefly explores the history of the Polly Woodside and museum, before focusing on the debates about the future use and location of the vessel brought about by the continuing redevelopment of Melbourne’s South Wharf from the mid-1990s until today. It examines how these contentious and often heated debates were shaped by different understandings of the ship's cultural significance, as well as ideas of community, ownership and sustainability, which have wider implications for the management of maritime cultural heritage within a context of urban redevelopment and place promotion.

Approaches to urban heritage, development and sustainability

More than half of the world’s population now live in urban areas, and cities provide the setting for contemporary challenges such as population growth, mass tourism and unequal access to socio-economic opportunities. Urban Heritage, Development and Sustainability examines the impact of these issues on urban heritage, considering innovative approaches to managing developmental pressures and focusing on how taking an ethical, inclusive and holistic approach to urban planning and heritage conservation may create a stronger basis for the sustainable growth of cities in the future.This volume is a timely analysis of current theories and practises in urban heritage, with particular reference to the conflict between, and potential reconciliation of, conservation and development goals.

Rapid recovery of an urban remnant reptile community following summer wildfire

Reptiles in urban remnants are threatened with extinction by increased fire frequency, habitat fragmentation caused by urban development, and competition and predation from exotic species. Understanding how urban reptiles respond to and recover from such disturbances is key to their conservation. We monitored the recovery of an urban reptile community for five years following a summer wildfire at Kings Park in Perth, Western Australia, using pitfall trapping at five burnt and five unburnt sites. The reptile community recovered rapidly following the fire. Unburnt sites initially had higher species richness and total abundance, but burnt sites rapidly converged, recording a similar total abundance to unburnt areas within two years, and a similar richness within three years. The leaf-litter inhabiting skink Hemiergis quadrilineata was strongly associated with longer unburnt sites and may be responding to the loss of leaf litter following the fire. Six rarely-captured species were also strongly associated with unburnt areas and were rarely or never recorded at burnt sites, whereas two other rarely-captured species were associated with burnt sites. We also found that one lizard species, Ctenotus fallens, had a smaller average body length in burnt sites compared to unburnt sites for four out of the five years of monitoring. Our study indicates that fire management that homogenises large areas of habitat through frequent burning may threaten some species due to their preference for longer unburnt habitat. Careful management of fire may be needed to maximise habitat suitability within the urban landscape.

Heritagescaping and the aesthetics of refuge: challenges to urban sustainability

The year 2012 marked the fortieth anniversary of UNESCO’s Convention Concerning the Protection of the World Cultural and Natural Heritage, or World Heritage
Convention. Regarded by many as a hugely successful project, World Heritage has
provided a framework for safeguarding a wide array of historic built environments.
The choice of “sustainable development and the role of communities” as the theme of
the fortieth anniversary was, however, recognition of the significant problems and
challenges this arena of cultural and spatial governance has created for those living in
and around listed sites. Cities have proved particularly challenging, and resistant to
prescriptive modeling at the level of international policy. Evictions, punitive
legislation, rising living costs, and loss of community are the now familiar by‐products of worldheritage that continue to go undocumented and ignored.
Against this backdrop, this chapter traces recent developments and trends surrounding urban heritage conservation, highlighting recent turns towards community‐driven approaches and discourses of sustainability. It then raises the issue of gentrification, with a particular focus on where such problems take on critical importance: small‐scale urban environments. Focusing on Galle in Sri Lanka, the final part of the chapter explores the emergence of a form of “heritagescaping” oriented by an aesthetics of solitude, tran-quility, and quiet comfort. In offering a contribution towards debates around urban sustainability and the role of heritage therein, it is argued that such processes present significant obstacles to the development of more community‐based, culturally sustainable forms of heritage conservation.

Citizen science program shows urban areas have lower occurrence of frog species, but not accelerated declines

Understanding the influence of landscape change on animal populations is critical to inform biodiversity conservation efforts. A particularly important goal is to understand how urban density affects the persistence of animal populations through time, and how these impacts can be mediated by habitat provision; but data on this question are limited for some taxa. Here, we use data from a citizen science monitoring program to investigate the effect of urbanization on patterns of frog species richness and occurrence over 13 years. Sites surrounded by a high proportion of bare ground (a proxy for urbanization) had consistently lower frog occurrence, but we found no evidence that declines were restricted to urban areas. Instead, several frog species showed declines in rural wetlands with low-quality habitat. Our analysis shows that urban wetlands had low but stable species richness; but also that population trajectories are strongly influenced by vegetation provision in both the riparian zone and the wider landscape. Future increases in the extent of urban environments in our study area are likely to negatively impact populations of several frog species. However, existing urban areas are unlikely to lose further frog species in the medium term. We recommend that landscape planning and management focus on the conservation and restoration of rural wetlands to arrest current declines, and the revegetation of urban wetlands to facilitate the re-expansion of urban-sensitive species.

Urban heritage, development and sustainability : international frameworks, national and local governance

This volume is a timely analysis of current theories and practises in urban heritage, with particular reference to the conflict between, and potential reconciliation of, conservation and development goals.

Urban heritage, development and sustainability: international frameworks, national and local governance

More than half of the world’s population now live in urban areas, and cities provide the setting for contemporary challenges such as population growth, mass tourism and unequal access to socio-economic opportunities. Urban Heritage, Development and Sustainability examines the impact of these issues on urban heritage, considering innovative approaches to managing developmental pressures and focusing on how taking an ethical, inclusive and holistic approach to urban planning and heritage conservation may create a stronger basis for the sustainable growth of cities in the future.This volume is a timely analysis of current theories and practises in urban heritage, with particular reference to the conflict between, and potential reconciliation of, conservation and development goals. A global range of case studies detail a number of distinct practical approaches to heritage on international, national and local scales. Chapters reveal the disjunctions between international frameworks and national implementation and assess how internationally agreed concepts can be misused to justify unsustainable practices or to further economic globalisation and political nationalism. The exclusion of many local communities from development policies, and the subsequent erosion of their cultural heritage, is also discussed, with the collection emphasising the importance of ‘grass roots’ heritage and exploring more inclusive and culturally responsive conservation strategies. Contributions from an international group of authors, including practitioners as well as leading academics, deliver a broad and balanced coverage of this topic. Addressing the interests of both urban planners and heritage specialists, Urban Heritage, Development and Sustainability is an important addition to the field that will encourage further discourse.