Urban Ecology Research Articles

Urban political ecology of wetland resources in Bamenda town, north west region, Cameroon

<p class="MsoNormal" style="text-align: justify; text-justify: inter-ideograph; line-height: 120%; mso-pagination: none; mso-hyphenate: none; layout-grid-mode: char; mso-layout-grid-align: none; margin: 12.0pt 0cm 6.0pt 147.4pt;"><span lang="EN-US" style="font-size: 10.0pt; line-height: 120%; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman'; color: black; mso-fareast-language: EN-SG; layout-grid-mode: line;">Wetlands are unique ecosystems that </span><span lang="EN-US" style="font-size: 10.0pt; mso-bidi-font-size: 11.0pt; line-height: 120%; font-family: 'Times New Roman',serif; mso-fareast-font-family: 宋体; color: black; mso-themecolor: text1; mso-fareast-language: EN-US;">play</span><span lang="EN-US" style="font-size: 10.0pt; line-height: 120%; font-family: 'Times New Roman',serif; mso-fareast-font-family: 'Times New Roman'; color: black; mso-fareast-language: EN-SG; layout-grid-mode: line;"> a critical role in the preservation of biodiversity and the provision of ecological services. This work on the Urban Political Ecology (UPE) of wetland resources in Bamenda has as objective to examine stakeholder participation and power relations resulting from the exploitation and management of wetlands. It looks at the challenges of wetland conservation in context of rapid urbanization. Using a mixed methods approach and the specific case of Bamenda III municipality, data was collected from secondary and primary sources. A household questionnaire survey was conducted with 150 households while 12 in-depth interviews were carried out with key informants. Data was analyzed quantitatively and qualitative and results were critiqued using the lens of UPE. Results show that between 1988 and 2022, wetlands reduction was more than 6.78%. This reduction is caused by agriculture, land reclamation and expansion of urban infrastructure. As such, Conservation has become a huge challenge due to overlapping responsibilities and an ambiguous regulatory system that focuses on biodiversity conservation only. This has created conflictual power relations and a complexified management system. The UPE approach has revealed that the consideration of socio-economic and cultural ecosystem services in wetland management is key to sustainability.</span></p>

The urban in ecology: a quantitative textual analysis of the scientific literature over a century

Many authors have described ‘urban ecology’ as a subfield of ecology that emerged in the 1990s and has expanded exponentially. We propose to take a step further and analyse the expansion of the ‘urban’ in ecology with a novel quantitative approach, with the aim to better understand the relationship between ecology and the urban. Previous quantitative assessments of the urban in ecology have focused on short to medium time spans (5 to 40 years) and on research coined as ‘urban ecology’, and have rarely considered the content of publications (e.g., vocabulary and topics) using quantitative methods. In this paper, we conduct a bibliometric assessment and an in-depth quantitative textual data analysis of a corpus of 960 articles published from 1922 to 2018 in 10 leading English-language journals in ecology and conservation biology. We address the following questions: (1) When and how have urban environments been integrated into ecological research during the past century? (2) What urban research topics have been investigated in ecology during the same period? (3) How have these research topics changed through time? Our results show that the urban was never entirely absent from publications in ecology. The quantitative analyses highlight three turning points (1970s, 1990s and 2000s) in the relationship between ecology and the urban. Moreover, they help visualize the shift from particularly scattered publications at the beginning of the period to publications characterized by a more homogeneous vocabulary, reflecting the stabilization of a research field focused on the urban in ecology.

Urban low-carbon governance and ecological efficiency: new evidence from prefecture-level cities in China

IntroductionIn the search for sustainable development, urban eco-development is becoming a core agenda for all countries. China’s low-carbon city pilot (LCCP) policy is an important initiative to promote urban low-carbon governance. And exploring the direction of LCCP policy is an important step towards sustainable urban development.MethodsSuper-SBM is employed to calculate urban ecological efficiency using panel data from 254 prefecture-level cities between 2007 and 2020. The methods of kernel density estimation and spatial Markov chains are applied to the spatial analysis of urban ecological efficiency. The spatial analyses examine the spatiotemporal patterns and dynamic evolving trends of urban ecological efficiency. Additionally, the multiperiod difference-in-differences method is used to assess the impact of the LCCP policy on urban ecological efficiency. On this basis, we apply the method of mechanism analysis to discuss the influence mechanism.ResultsThe results indicate that urban ecological efficiency gradually forms a continuous spatial clustering pattern, although there is a widening tendency in the absolute differences. In the subsequent transfer process, the spatial factor plays a highly significant role. Benchmark regressions and auxiliary robustness tests demonstrate that the LCCP policy is effective in improving urban ecological efficiency. Further analysis shows that the effect of LCCP policies on ecological efficiency can be transmitted by promoting green technology innovation as well as facilitating a low-carbon transition in the energy mix. The above findings indicate the presence of the "Green Innovation Effect" and the "Decoupling Effect".DiscussionThese discoveries enhance the theoretical framework of urban ecology and offer valuable insights for other regions seeking to implement low-carbon urban governance.

Investigating the association between household exposure to Anopheles stephensi and malaria in Sudan and Ethiopia: A case-control study protocol.

Endemic African malaria vectors are poorly adapted to typical urban ecologies. However, Anopheles stephensi, an urban malaria vector formerly confined to South Asia and the Persian Gulf, was recently detected in Africa and may change the epidemiology of malaria across the continent. Little is known about the public health implications of An. stephensi in Africa. This study is designed to assess the relative importance of household exposure to An. stephensi and endemic malaria vectors for malaria risk in urban Sudan and Ethiopia. Case-control studies will be conducted in 3 urban settings (2 in Sudan, 1 in Ethiopia) to assess the association between presence of An. stephensi in and around households and malaria. Cases, defined as individuals positive for Plasmodium falciparum and/or P. vivax by microscopy/rapid diagnostic test (RDT), and controls, defined as age-matched individuals negative for P. falciparum and/or P. vivax by microscopy/RDT, will be recruited from public health facilities. Both household surveys and entomological surveillance for adult and immature mosquitoes will be conducted at participant homes within 48 hours of enrolment. Adult and immature mosquitoes will be identified by polymerase chain reaction (PCR). Conditional logistic regression will be used to estimate the association between presence of An. stephensi and malaria status, adjusted for co-occurrence of other malaria vectors and participant gender. Findings from this study will provide evidence of the relative importance of An. stephensi for malaria burden in urban African settings, shedding light on the need for future intervention planning and policy development.

Book review of: Kaika, Maria; Keil, Roger; Mandler, Tait; Tzaninis, Yannis (eds.) (2023): Turning up the heat. Urban political ecology for a climate emergency

Buchrezension.

Race in nature stewardship: an autoethnography of two racialised volunteers in urban ecology

Race in nature stewardship: an autoethnography of two racialised volunteers in urban ecology

Exploring black kite (Milvus migrans) dynamics: Seasonal abundance and habitat preferences in an urban gradient

Urban expansion globally has altered biodiversity by transforming urban habitats, leading to habitat loss and changes in ecological systems. Black kites (Milvus migrans) are adaptable raptors across diverse landscapes, from natural to highly urbanized areas. This study focuses on Gujranwala City, Pakistan, a unique habitat offering insights into black kite ecology along an urban gradient. The research assesses seasonal abundance, temperature and humidity impacts, behavioral activities, and habitat preferences of black kites. Results show higher abundance in urban areas, influenced by environmental factors and food availability from anthropogenic sources. Black kites exhibit time-dependent associations with temperature and humidity, especially before sunset. Additionally, a significant correlation is observed between black kite abundance and solid waste components, particularly food and plastic waste, in the urban area. These findings contribute to understanding urban ecology, highlighting the adaptability of black kites to human-modified environments and the potential implications for conservation and management strategies.

Improving Urban Ecological Welfare Performance: An ST-LMDI Approach to the Yangtze River Economic Belt

Improving Urban Ecological Welfare Performance: An ST-LMDI Approach to the Yangtze River Economic Belt

Information extraction of seasonal dissolved oxygen in urban water bodies based on machine learning using sentinel-2 imagery: An open access application in Baiyangdian Lake

Water bodies are crucial components of urban ecology. The development of rapid and timely water-quality assessment tools using easily measured variables is essential for the health management of urban water bodies. In this study, we focused on the dissolved oxygen (DO) of Baiyangdian Lake using 251 sets of empirically measured water quality data and corresponding Sentinel-2 satellite images. Nine machine learning algorithms were then used to develop a rapid detection algorithm for the spatial distribution of the DO concentration in Baiyangdian Lake. This study successfully applied these methods to invert the DO concentration in Baiyangdian Lake during spring, summer, and autumn. The results indicated that extra tree regression (ETR) provided the most accurate and stable results for inverting the DO concentration among the nine machine learning methods. In contrast, AdaBoost regression (ABR), Bayesian ridge regression (BRR), and support vector machines (SVM) exhibit relatively poor regression performance and lack sensitivity to DO concentrations. Moreover, the DO concentration in Baiyangdian Lake ranged from approximately 0 to 12 mg/L, with notable spatiotemporal variations. The highest overall DO concentration was observed in the spring, particularly in the southern region. The DO concentration significantly decreased during summer compared to that in spring, with higher values in the southwestern area and lower values in the northern region. The DO concentration reached its lowest value in autumn, with slightly higher values in the southern region. This study focused on the estimation and inversion of DO concentrations in the water bodies of Baiyangdian Lake. By introducing and comparing the performances of commonly used machine learning models, a rapid estimation of the DO concentration was achieved, thereby overcoming the limitations of traditional water quality monitoring methods in DO inversion. It not only intuitively explained the temporal and spatial variation patterns of DO concentration but also laid a foundation for further in-depth exploration of the interactions between DO and other water quality parameters.

Home ranges, habitat selection, and energy expenditure of Strix varia (Barred Owls): Understanding the full diel cycle matters for enhancing urban landscapes

Abstract We integrated GPS and accelerometer data to examine habitat selection and energy expenditure patterns across the diel cycle in Strix varia (Barred Owls), addressing a critical gap in wildlife research that often overlooks activity during the “inactive” phase. Owls in Baton Rouge, Louisiana, selected forests with tall canopies and open understories, particularly in affluent neighborhoods, supporting the “luxury effect” in urban biodiversity. Nocturnal home ranges were larger (31.8 ha) compared to diurnal home ranges (8.9 ha), indicating broader habitat use at night. The total area of preferred nocturnal habitat was 33% of the Baton Rouge study area, whereas preferred diurnal habitat comprised only 5%. Energy expenditure was inversely related to preference in nocturnal home ranges but increased with preference in diurnal home ranges. Our models were validated using independent data from Clemson, South Carolina, supporting the robustness of our analysis and revealing generalities in owl habitat selection across these regions. This research contributes to a deeper understanding of urban ecology, highlighting habitat components preferred by owls and possibly other forest-dwelling species. It emphasizes the difference in nocturnal and diurnal home range sizes, the scarcity of daytime refuges for S. varia in urban landscapes, and the variation in energy expenditure in preferred habitats. Our findings advocate for urban designs that accommodate wildlife activity throughout the day and night, and highlight the positive correlation between preferred owl habitat and affluent neighborhoods, underscoring the need for equitable distribution of green spaces to foster biodiversity across socioeconomic gradients. These insights will help develop strategies to enhance the ecological value of urban environments and the conservation of S. varia and associated forest-dwelling species in rapidly urbanizing areas.

Holy Infrastructures: Catholicism, Detroit Borderlands, and the Elements

Abstract Through an ethnographic rendering of the Catholic Church at the Detroit-Windsor borderland, this article foregrounds the ways elemental forces, including water, earth/soil, and air, form an interconnected entity that constitutes part of the theopolitical and religious scaffolding of Holy Infrastructures. We argue that the repetitive inscription of social and affective flows within an urban terrain generates infrastructure projects that contract forces of variable intensity into alliance or disjuncture. The interrelation of these forces as Holy Infrastructure, offers vital information on (dis/en)abling racialized forms of hosting and being hosted by the divine within urban settings, specifically as it pertains to theological labor at multiple scales. Indeed, we understand holiness in Catholic Detroit as a performative sovereignty of partition that mediates a desire for unbrokenness and spatiotemporal rapture. The topologies of Holy Infrastructure thus give rise to overlapping but divergent “wholes” within the racialized urban terrain, offering insight into the Church as a loose network of horizontal alliances that may enforce or subvert hierarchy. Our focus on elemental forces allows us to move beyond abstractions and focus on how theological projects take shape in physical space within an urban ecology. Indeed, Holy Infrastructures come into focus most clearly in relation to the intersection of theology with environmental, climatic, and territorial projects. By approaching Church and State as co-constitutive, we show how Holy Infrastructures offer insight into the racialized and gendered terrain of contemporary Detroit.

Analyzing Thermal Environment Contributions and Driving Factors of LST Heterogeneity in Different Urban Development Zones

Analyzing the impacts of urban landscape patterns on the thermal environment has become one of the key research areas in addressing urban heat islands (UHIs) and improving the living environment. A case study was carried out in Fuzhou, Fujian Province of China, and bi-temporal Landsat imagery was selected to calculate land surface temperature (LST), percent impervious surface area (ISA), and fractional vegetation cover (FVC). The urban area was further divided into three concentric urban zones, ranging from the city center to the urban periphery, based on urban development densities. The spatial pattern of LST and its variance were analyzed and compared between different zones and different dates. The thermal environment contribution of different zones was also quantified to indicate the change in urban landscape patterns resulting from urban expansion in different zones. Furthermore, Geodetector was used to explore the single factors and interaction factors controlling the spatial patterns of LST in each zone. The results showed that (i) urban expansion primarily increased in Zone 2 and Zone 3, and the areal proportion of high and sub-high LST areas increased from 56.11% and 21.08% to 62.03% and 32.49% in Zone 2 and Zone 3, respectively, from 2004 to 2021; (ii) the heat effect contribution of Zones 2 and 3 reached from 75.16% in 2004 to 89.40% in 2021, indicating that the increase in ISA with >LSTmean was more pronounced in Zone 3 and Zone 2 during the period; (iii) the driving factors of LST spatial distribution were regionally different because of the different landscape patterns, and the explanatory power for the heterogeneity of LST in Zone 1 was weaker than in Zone 2 and Zone 3 in the study area; (iv) the interaction of different factors had a higher explanatory power in the spatial distribution of LST than a single factor in each zone because the distributions of land cover types are heterogeneous in urban areas. The results of this study can be used to improve urban planning for urban ecology and UHI mitigation.

The Material Politics of Graffiti Removal

While anti-graffiti policies have been examined in various places, the concrete conditions of graffiti removal remain largely unexplored. Based on ethnographic fieldwork, this article considers a generative dimension of graffiti removal techniques and highlights their contribution to the visual ordering of urban reality through two main actions: making differences and making similarities. Anything but automatic and simple, graffiti removal is a complex operation consisting of technical gestures and ontological re-specifications, which are accomplished within the material entanglements of the city’s surfaces. A matter of continuous transformations, graffiti removal participates, like graffiti writing, in the visual becoming of urban ecologies.

Driving Analysis and Multi Scenario Simulation of Ecosystem Carbon Storage Changes Based on the InVEST-PLUS Coupling Model: A Case Study of Jianli City in the Jianghan Plain of China

The carbon storage capacity of terrestrial ecosystems serves as a crucial metric for assessing ecosystem health and their resilience to climate change. By evaluating the effects of land use alterations on this storage, carbon management strategies can be improved, thereby promoting carbon reduction and sequestration. While county-level cities are pivotal to ecological conservation and high-quality development, they often face developmental challenges. Striking a balance between economic growth and meeting peak carbon emissions and carbon neutrality objectives is particularly challenging. Consequently, there is an urgent need to bolster research into carbon storage management. The study focuses on Jianli City, employing the InVEST model and land use data to examine the response patterns of land use changes and terrestrial system carbon storage from 2000 to 2020. Using the PLUS model, the study simulated the land use and carbon storage in Jianli City for the year 2035 under three scenarios: Natural Development scenario, Urban Expansion scenario, and Ecology and food security scenario. Our findings indicate the following: (1) Between 2000 and 2020, significant shifts in land use were observed in Jianli City. These changes predominantly manifested as the interchange between Cropland and Water areas and the enlargement of impervious surfaces, leading to a decrease of 691,790.27 Mg in carbon storage. (2) Under the proposed scenarios—Natural Development scenario, Urban Expansion scenario, and Ecology and food security scenario—the estimated carbon storage capacities in Jianli City were 39.95 Tg, 39.90 Tg, and 40.14 Tg, respectively. When compared with the 2020 data, all these estimates showed an increase. In essence, our study offers insights into optimizing land use structures from a carbon storage standpoint to ensure stability in Jianli’s carbon storage levels while mitigating the risks associated with carbon fixation. This has profound implications for the harmonious evolution of regional eco-economies.

Correlation between physical characteristics and plant composition of home gardens in Bandung City, West Java, Indonesia

Abstract. Laraswari S, Wulandari I, Husodo T, Abdoellah OS, Amalia CA, Fawwaz MR, Azadi SM, Farhaniah SS. 2024. Correlation between physical characteristics and plant composition of home gardens in Bandung City, West Java, Indonesia. Biodiversitas 25: 3051-3060. Green open space in urban settings provides various benefits to city residents, yet the increase in urban population indirectly results in a decrease in urban green space. Home gardens can expand urban green space to complement public areas but are often overlooked. This research examines the physical characteristics (area size, shape, and zoning) and plant composition of home gardens in Bandung City, West Java, Indonesia, as well as the correlation between both aspects. This research examined extensive data collection from a densely populated urban area, a context rarely explored but highly relevant in recent urban development. Data was collected in five housing complexes in the Rancasari Sub-district, with 514 home gardens, and correlation analysis was performed using Canonical Correspondence Analysis (CCA). The result showed that 92.2% of the home gardens had very narrow areas with 2-53m2. The shape of the home garden was dominated by strips, with 66% and 94% of home gardens having front zoning. Across the sampled home gardens, there were 1054 species from 141 families, with a total of 32,967 individuals. Araceae was the most commonly found family with 100 species and Sri Rejeki (Aglaonema commutatum Schott) had the largest number of individuals. Most of the home garden plants were ornamental plants due to their attractive morphology, making them relatively homogeneous within 95% of the home gardens. The presence of ornamental plants was the least influenced by physical characteristics, while medicinal and spice plants can be grouped together as they were more affected by the area size and less by the zone and shape. Edible plants were the most influenced by all physical characteristics, particularly the zone. This study provides new insights into urban ecology, offering valuable information for homeowners, developers, and policymakers to enhance the role of home gardens as private green spaces.

Exploring the spatio-temporal driving mechanism of multi-dimensional urbanization on urban residential buildings based on GTWR: a case study of China

ABSTRACT Examining how urbanization affects carbon emissions in the construction industry is crucial for China's efforts to achieve environmentally friendly and low-carbon growth. Nevertheless, current research predominantly employs a unidimensional approach to gauge urbanization, overlooking the nuanced characteristics of novel urbanization. This study explored the spatial and temporal characteristics of the impact of urbanization on carbon emissions from urban residential buildings from a multidimensional perspective, starting from five dimensions: population, economy, land, life, and ecology, using a spatial–temporal geographically weighted regression model (GTWR) and panel data from 30 provinces in China for the period 2010–2020. The findings of this study revealed that, on the whole, population urbanization, land urbanization, and lifestyle urbanization exert a significant facilitating influence on carbon emissions from urban residential buildings. Conversely, economic urbanization exhibits a notable inhibitory effect on carbon emissions from urban residential buildings. Furthermore, ecological urbanization transitions from an inhibitory effect to a promoting effect on carbon emissions from urban residential buildings. The impact of urbanization across various dimensions on carbon emissions from urban residential buildings displays spatiotemporal heterogeneity across different regions and periods. In addition, the structure of energy consumption is a contributing factor to the increase in carbon emissions from urban residential buildings, while there is a notable U-shaped relationship between the level of foreign investment, the industrial structure, and carbon emissions originating from urban residential areas. This study offers profound insights into the relationship between urbanization and carbon emissions, providing valuable guidance for policymakers.

Shaping Baltimore’s urban forests: past insights for present-day ecology

ContextLand use history of urban forests impacts present-day soil structure, vegetation, and ecosystem function, yet is rarely documented in a way accessible to planners and land managers.ObjectivesTo (1) summarize historical land cover of present-day forest patches in Baltimore, MD, USA across land ownership categories and (2) determine whether social-ecological characteristics vary by historical land cover trajectory.MethodsUsing land cover classification derived from 1927 and 1953 aerial imagery, we summarized present-day forest cover by three land cover sequence classes: (1) Persistent forest that has remained forested since 1927, (2) Successional forest previously cleared for non-forest vegetation (including agriculture) that has since reforested, or (3) Converted forest that has regrown on previously developed areas. We then assessed present-day ownership and average canopy height of forest patches by land cover sequence class.ResultsMore than half of Baltimore City’s forest has persisted since at least 1927, 72% since 1953. About 30% has succeeded from non-forest vegetation during the past century, while 15% has reverted from previous development. A large proportion of forest converted from previous development is currently privately owned, whereas persistent and successional forest are more likely municipally-owned. Successional forest occurred on larger average parcels with the fewest number of distinct property owners per patch. Average tree canopy height was significantly greater in patches of persistent forest (mean = 18.1 m) compared to canopy height in successional and converted forest patches (16.6 m and 16.9 m, respectively).ConclusionsHistorical context is often absent from urban landscape ecology but provides information that can inform management approaches and conservation priorities with limited resources for sustaining urban natural resources. Using historical landscape analysis, urban forest patches could be further prioritized for protection by their age class and associated ecosystem characteristics.

Diversity and spatial genetic structure of the common opossum (Didelphis marsupialis) in an urban matrix of Northwestern Colombia

The common opossum (Didelphis marsupialis) is a marsupial widely distributed in the Neotropics, where it lives in urbanized environments. The apparent scarcity and fragmentation of available habitat, and high rates of vehicle collisions, may represent barriers to dispersal. To assess the functional connectivity of this species and its potential use as a model in urban ecology, we evaluated the structure and genetic diversity of opossums in the metropolitan area of the Aburrá Valley (AMVA), Colombia, using sequences of the mitochondrial Cytochrome B (Cytb) gene and nine autosomal microsatellite loci. Although Cytb presented low levels of variation, microsatellite markers revealed high genetic diversity (He = 0.852 and Ho = 0.698). The geographic distribution of mitochondrial lineages and a spatial principal component analysis (sPCA) of microsatellites showed the absence of genetic structure and effective barriers to dispersal of opossums in the study area. This scenario suggests that hostile landscapes such as those in urban environments may be suitable enough to allow the effective connectivity of some species such as the common opossum and others with high dispersal ability in urbanized areas. Nonetheless, it is necessary to evaluate the impact of releases of rescued fauna made by the environmental authority on the population structure of urban opossums.

Animal Studies

Abstract This review essay explores some key contributions to animal studies in 2023. In Section 1, Humanitarianism Beyond Humanism, I consider how Benjamin Meiches’s Nonhuman Humanitarians tracks animal labour as a form of post-humanitarianism. Section 2, Animalist India, turns to Naisargi N. Davé’s Indifference and Yamini Narayanan’s Mother Cow, Mother India, two complementary examinations of human–animal relations in India. Then, in Section 3, Zoological Marx, I compare Leigh Claire La Berge’s Marx for Cats and Dinesh Wadiwel’s Animals and Capital, both fusions of Marxism and animal studies that represent and realize a much-needed synthesis of these two fields. Before I begin, though, a confession and a celebration. A more comprehensive review than this might have discussed Maan Barua’s fine-grained account of Delhi’s macaques and London’s parakeets in Lively Cities: Reconfiguring Urban Ecology; Sharon Patricia Holland’s disruption of the ‘hum/animal’ distinction through the category of Blackness in an other: a black feminist consideration of animal life; Richard O. Prum’s theorization of a queer evolutionary biology in Performance All the Way Down: Genes, Development, and Sexual Difference; Sandra Swart’s history of colonialism and animals in The Lion’s Historian: Africa’s Animal Past; and Robert McKay and Susan McHugh’s collection of essays on parodic literary forms, Animal Satire. A superior essay, written under different circumstances, would have been of more use to its readers by engaging with how each of these texts makes a noteworthy intervention into animal studies. If my review last year was deliberately modest, this year’s has turned out regrettably incomplete. But this incompletion is nonetheless a testament to the breadth and depth of work in the field, to the seriousness of its arguments and the careful attention they demand from the reader. This was brought home to me by the topics and questions that I heard discussed at this year’s British Animal Studies Network, the final meeting of the network after more than a decade of events at the University of Strathclyde, organized brilliantly by Erica Fudge. So: a thank you to Erica, for your hospitality and comradeship.

Is urbanization a driver of aboveground biomass allocation in a widespread tropical shrub, Turnera subulata (Turneroideae - Passifloraceae)?

Plant biomass allocation is mainly affected by the environment where each individual grows. In this sense, through the rapid global expansion of impermeable areas, urbanization has strong, albeit poorly understood, consequences on the biomass allocation of plants found in this environment. Nevertheless, the comprehension of biomass allocation processes in urban shrubs remains unclear, because most studies of urban ecology focus on tree species. This is an important gap of knowledge because a great part of urban vegetation is composed of shrubs and their association with trees have positive impacts in urban ecosystem services. In this study, we explored the ecological and potential selective pressure effects of an urbanization gradient on the biomass allocation patterns of aboveground organs of Turnera subulata, a widely distributed tropical shrub. We have demonstrated that, for certain reproductive organs, biomass allocation decreases in locations with higher urbanization. Unlike expected, the biomass of vegetative organs was not affected by urbanization, and we did not observe any effect of urbanization intensity on the variance in biomass allocation to vegetative and reproductive organs. We did not record urbanization-mediated trade-offs in biomass allocation for reproductive and vegetative organs. Instead, the biomass of these structures showed a positive relationship. Our data suggest that urbanization does not result in radical changes in biomass allocation of T. subulata, and neither in the variation of these traits. They indicate that the ability of T. subulata to thrive in urban environments may be associated with life history and morphological mechanisms. Our findings contribute to the understanding of shrub plant responses to urbanization and highlight urbanization as a potential factor in resource allocation differences for different structures and functions in plants living in these environments.