About the Project
Discarded plastic waste in the peri-urban environment is a serious challenge for sustainable waste management and for the delivery of environmental and public health. In many cities in sub-Saharan Africa, plastic wastes block urban drainage systems, and during rain events this often leads to localised flooding, with an increased risk of exposure to raw sewage in standing water. Importantly, urban plastic litter can act as a transient receptacle for rainwater and thus provide a larval habitat for mosquitoes. Although the role of plastic pollution on mosquito ecology is poorly understood, this increased abundance of mosquito habitat in the peri-urban environment can lead to increased vector density and the incidence of vector-borne diseases such as malaria, Zika, dengue and lymphatic filariasis. Urban wastes can also be an attractant for flies, e.g. filth flies such as the house fly (Musca domestica), which can transfer enteric diseases such as dysentery, diarrhoea, typhoid and cholera, particularly if the waste has been in contact with a source of faecal contamination (e.g. following flooding or via scavenging by domestic or wild animals). Consequently, urban litter may also play an important role in the emergence of novel zoonotic diseases or genes for anti-microbial resistance. Therefore, quantifying whether plastic waste in the peri-urban environment is providing breeding sites for disease vectors, is important for addressing the Sustainability Development Goals (e.g. SDG3), and critical for incentivising policy-makers to provide resources to local communities for the removal of urban litter as part of a sustainable strategy to reduce disease burden and the risk of emerging infectious diseases.
Key research questions:
Understanding the multidisciplinary interactions between sustainable disease management & sustainable waste management will be directly addressed through this studentship by focussing on the following questions:
1. Do different types of plastic litter preferentially attract mosquito oviposition, and can plastic litter facilitate disease transfer via flies?
2. Can a reduction in urban litter reduce pathogen and vector abundance (and disease burden)?
3. How do people interact with plastic litter and do they view it as a source of disease either through mosquitos or enteric diseases?
4. What are the socio-political obstacles for incentivising governments to remove peri-urban litter and increase sustainable waste disposal?
This interdisciplinary project links environmental microbiology, waste management and disease ecology with sustainable development, public health and medical anthropology. The project will adopt methods and theories from both the natural & social sciences and will employ both qualitative & participatory approaches with a significant level of engagement with local communities. Field work will be carried out in Malawi and will focus on the peri-urban landscape of Blantyre. During two field seasons in Africa (each trip lasting between 4-5 months) the student will use a combined field and lab approach to (i) quantify the extent to which standing water associated with plastic waste supports populations of mosquitoes (identified by both molecular approaches and identification of larval stage); (ii) conduct a series of controlled laboratory ‘choice experiments’ to determine if mosquitoes preferentially oviposit in different types (e.g. polyethylene, polyethylene terephthalate, polystyrene), colours or sizes of typical plastic wastes in the urban environment, together with an assessment of the associated larval survival; and (iii) determine the potential for flies to spread disease from different categories of plastic litter.
The formal start date for the successful applicant is 1st October 2021
Candidates should ideally have a First-Class Honours degree and Master’s degree in a relevant subject. Applicants with a minimum of a 2:1 Honours degree may be considered provided they also have a postgraduate level degree.
Although the formal deadline for applications is Friday 8th January 2021 at 5pm, serious applicants must get in touch well in advance of this to discuss their application: please email a CV and covering letter with the contact details (including email addresses) of two referees to Prof Richard Quilliam (firstname.lastname@example.org). Your covering letter should clearly set out your suitability and motivation for this PhD with reference to your past experience and achievements. Appropriate applicants will be invited by Prof. Quilliam to make a full application to both to the IAPETUS2 website and to the University of Stirling. Initial shortlisting will take place immediately after the 8th January deadline. Those candidates who are successful in shortlisting will be required to attend an online IAPETUS interview on Tuesday 16th February 2021.
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