Erica McAlister on the beauty of flies

Episode Summary

Executive Summary: Entomologist Erica McAllister argues flies are essential, not merely pests: they pollinate, decompose waste, support food webs, and even aid medicine and sustainable protein production. The conversation blends taxonomy, fieldwork, museum science, DNA research, and public outreach to show how flies’ diversity and hidden ecological roles make them crucial to ecosystem health and future human needs.

Main Topics: Flies as vital ecosystem workers (Priority: 5/5): McAllister reframes flies as pollinators, decomposers, predators, and keystone species that maintain ecosystems rather than merely spread disease. Misconceptions about mosquitoes and other ‘bad’ flies (Priority: 5/5): She argues that public fears over a few harmful species should not justify condemning thousands of mostly harmless or beneficial species. Museum collections, taxonomy, and DNA science (Priority: 4/5): The Natural History Museum’s fly collection is presented as a dynamic research resource, now increasingly used with genomics to identify cryptic species and study change over time. Fieldwork, discovery, and species description (Priority: 4/5): McAllister describes collecting across deserts, wetlands, islands, and caves, emphasizing that there are still many undescribed fly species and that discovery remains central to the field. Citizen science and public engagement (Priority: 4/5): Recording schemes, field observations, and outreach are portrayed as essential to monitoring biodiversity, climate change, and species distributions. Flies and future applications (Priority: 5/5): The interview highlights black soldier flies for waste-to-protein systems and maggots for wound debridement and antibiotic-resistant infection control.

Key Arguments: Most flies are beneficial or neutral; the public focuses on a tiny minority of nuisance or disease-vector species. Flies provide ecosystem services at every life stage, including pollination, decomposition, predation, and nutrient cycling. Eradicating all members of a group because of harmful species is ecologically careless; management should target specific species or populations. Mosquitoes are highly diverse, and only a fraction are major disease vectors, so species-level understanding matters. Museum specimens are not static artifacts; with DNA methods they can answer modern questions about evolution, resistance, and population change. Citizen science and amateur recorders are indispensable for biodiversity monitoring and climate-change analysis. Insects, especially fly larvae, could become a major sustainable protein source for livestock and humans. Maggot therapy is a legitimate medical tool for debriding wounds and reducing infection, including MRSA.

Data Points: Flies per human on Earth: 17 million - Used in the opening to emphasize fly abundance globally. Fly species in the UK: Over 7,000 - Shows the extraordinary diversity of flies in one country. Mammal species in the world: Fewer than fly species in the UK - Comparison used to illustrate how underappreciated flies are. Museum specimens managed: 2.5 million flies and 260,000 fleas - McAllister’s curatorial responsibility at the Natural History Museum. Mosquito species globally: About 3,500 - Used to argue against treating all mosquitoes as harmful. Mosquito species important as disease vectors: About 150 - Supports the claim that only a small minority are major vectors. Anopheles gambiae hidden diversity: At least 7 morphologically similar species - Example of cryptic species revealed by genetics. New venoms found in robber flies: At least 10 - Recent research showing unexpected biochemical diversity in predatory flies. Ethiopian field observation: 333,000 ants counted in 6 months - Illustrates the scale of field data collection and ecological abundance work. Dominica species inventory: 8 house-fly specimens awaiting description - Example of ongoing new species discovery from island surveys. Historical DNA timeframe: About 100 years - Museum mosquito collection used to track resistance and population changes over time. Bee fly recording: First record in February - Presented as evidence of earlier seasonal activity, possibly tied to climate change.

Pivotal Quotes: "How can you dislike a species that from start to finish is maintaining and enhancing the environment?" — Erica McAllister: Her core defense of flies as ecologically beneficial organisms. "There are so many species that they can identify. What does it feel like then to study an entirely new species or to discover something completely unexpected about a known species?" — Jamal Khalili: Introduces the theme of discovery and the value of taxonomic research. "If we don't show what we're doing, why we're doing, we can't engage everyone with it." — Erica McAllister: Her justification for outreach and science communication as part of scientific work.

Implications: The interview urges listeners to see insects as infrastructure: essential to food systems, medicine, and ecosystem stability. For science and conservation, it argues for species-level management, stronger citizen science, and investment in taxonomy and museum collections.