
Rosie ManganUniversity of Stirling · Department of Biological and Environmental Sciences
Rosie Mangan
Doctor of Philosophy
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19
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Introduction
Im an entomologist working to make pest control more sustainable. I study factors regulating insect abundance, distribution, and population growth, as well as consequences of intensive pesticide use, the prevalence of insecticide resistance genes, and the development of strategies to reduce reliance on chemical pesticides.
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Publications
Publications (19)
Research games provide a promising avenue for studying social-ecological systems because they can capture complexity and reflect multiple stakeholders’ perspectives. However, there are few methodological studies on the design, validation and implementation of research games. This paper focuses on the development and implementation of an online mult...
Pathogens often exert strong selection, yet host populations maintain considerable genetic variation for resistance, possibly due to environmental heterogeneity causing fitness trade-offs. These trade-offs could help explain genetic variation for pathogen defence, and also constrain resistance evolution to microbial pesticides (an underappreciated...
The evolution of pesticide resistance is a widespread problem with potentially severe consequences for global food security. We introduce the resevol R package, which simulates individual-based models of pests with evolving genomes that produce complex, polygenic, and covarying traits affecting pest life history and pesticide resistance. Simulation...
Lagarosiphon major (Ridl.) Moss ex Wager (Hydrocharitaceae) is a submerged freshwater plant native to South Africa, and a destructive invader of waterways across Europe, Australasia and the U.S.A. Native range exploration identified a leaf mining ephydrid fly, Hydrellia lagarosiphon, as a promising biological control candidate agent. Host specifici...
Microbial biopesticides containing living parasites are valuable emerging crop protection technologies against insect pests, but they are vulnerable to resistance evolution. Fortunately, the fitness of alleles that provide resistance, including to parasites used in biopesticides, frequently depends on parasite identity and environmental conditions....
1. The evolution of pesticide resistance is a widespread problem with potentially severe consequences for global food security.
2. We introduce the resevol R package, which simulates individual-based models of pests with evolving genomes that produce complex, polygenic, and covarying traits affecting pest life history and pesticide resistance.
3. S...
Nymphaea mexicana Zuccarini (Nympheaceae) (Mexican waterlily) is a rooted floating-leaved aquatic plant native to southern USA and Mexico that has become a problematic invasive alien plant in South Africa. Biological control is considered a desirable management strategy for the plant in South Africa. A good understanding of the genetic structure of...
Males sometimes engage in fights over contested resources such as access to mates; in this case, fighting behaviour may be adjusted based on the value they place on the females. Resource value (RV) can have two components. First, males can assess the quality of females, which constitutes an objective assessment of RV. Second, internal state such as...
Egeria densa Planchon (Hydrocharitaceae) is a submerged macrophyte native to South America. It forms part of a new suite of invasive aquatic plants that has benefited from open nutrient-rich freshwater systems following the successful biological control of floating aquatic plants in South Africa. The specificity of the leaf-mining fly, Hydrellia eg...
The grain aphid Sitobion avenae is a prolific pest of cereal crops worldwide, controlled effectively with pyrethroid insecticides. However, the classic knock down resistance ( kdr ) mutation, L1014F on the S. avenae sodium channel gene, has been identified as the cause of the recently observed heterozygous ( kdr -SR) resistance in the SA3 grain aph...
Large pine weevils (Hylobius abietis) represent a major pest for conifer forests. Current methods of control include use of chemicals. In addition to the important economic costs associated to these methods, pesticides are a major threat for the environment. To reduce the use of pesticides, new biological methods need to be developed. Nematodes are...
Effective biological control of a weed cannot be achieved unless agents can inflict sufficient damage for the plant’s growth and reproduction to be significantly depressed. The leaf-mining fly Hydrellia lagarosiphon is being considered for release in Ireland and New Zealand as a biocontrol agent for the invasive African macrophyte Lagarosiphon majo...
There are many examples of cryptic species that have been identified through DNA-barcoding or other genetic techniques. There are, however, very few confirmations of cryptic species being reproductively isolated. This study presents one of the few cases of cryptic species that has been confirmed to be reproductively isolated and therefore true spec...
Preservation of an insect culture under laboratory conditions is essential for its study. Numerous diets have been developed for entomophagous insects undergoing screening as biological control agents in attempts to improve the nutritional quality of food provided in laboratory settings. However, less emphasis has been given to developing a more ef...
Lagarosiphon major (Ridl.) Moss ex Wager (Hydrocharitaceae), an aquatic macrophyte native to Southern Africa that has become invasive in several countries worldwide, is a potential target for biological control. Biology studies were conducted on Polypedilum (Pentapedilum) n. sp. near reei Oyewo & Sæther (Diptera: Chironomidae), a midge whose larvae...
Hydrellia lagarosiphon is a leaf mining fly of the submerged aquatic plant Lagarosiphon major and native to South Africa. With many favorable attributes this fly has the potential to be a valuable biological control agent of L. major, which has become a problematic weed in many parts of the world. Reproductive and developmental biology of H. lagaro...
Peatlands in Ireland have been subject to peat extraction and drainage for many years, with detrimental effects on the flora and fauna of the ecosystem. Blanket bog has been listed for protection under Annex 1 of the EU habitats directive, making the conservation of intact bogs as well as the restoration of degraded sites a priority. In order to as...