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Biodiversity inhibits parasites: Broad evidence for the dilution effect
Open accessAbstract
Significance: The dilution effect hypothesis suggests that diverse ecological communities limit disease spread via several mechanisms. Therefore, biodiversity losses could worsen epidemics that harm humans and wildlife. However, there is contentious debate over whether the hypothesis applies broadly, especially for parasites that infect humans. We address this fundamental question with a formal meta-analysis of >200 assessments relating biodiversity to disease in >60 host–parasite systems. We find overwhelming evidence of dilution, which is independent of host density, study design, and type and specialization of parasites. A second analysis identified similar effects of diversity in plant–herbivore systems. Thus, biodiversity generally decreases parasitism and herbivory. Consequently, human-induced declines in biodiversity could increase human and wildlife diseases and decrease crop and forest production.
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“A rich literature on infectious diseases of wildlife, livestock, and plants demonstrates increased pathogen transmission when biodiversity is lost from some ecological communities (9, 53), supporting the generality of this relationship across nonzoonotic disease systems as well.”
From Impacts of biodiversity and biodiversity loss on zoonotic diseases (2021) · cites this paper as [9]
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“In contrast, biodiversity loss has been shown to often increase the risk of zoonotic diseases, for example, through the dilution effect (9).”
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“But for decades, we have also known that under some conditions, high biological diversity can decrease the transmission of zoonotic diseases that have already become established (8, 9).”
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“However, a larger metaanalysis found that the dilution effect was as strong for zoonoses as for other types of diseases (9), a conclusion that was robust to criticisms from the authors of the earlier study (57, 58).”
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Metadata
- Authors
- Civitello, D. J., Cohen, J., Fatima, H., Halstead, N. T., Liriano, J., McMahon, T. A., Ortega, C. N., Sauer, E. L., Sehgal, T., Young, S., & Rohr, J. R.
- Affiliations
- University of South Florida (US)
- ORCID
- Venue
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Published
- 2015-06-11
- Volume
- 112
- Issue
- 28
- Pages
- 8667-8671
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- PMC
- PMC4507196
- OpenAlex
- W1787861744
- Semantic Scholar
- 30ae28188a18cd22709c7ef13c462acd9260a5ea
- Cited by
- 758
- References
- 34
- Citations by year
- 2026: 38 · 2025: 72 · 2024: 83 · 2023: 61 · 2022: 81 · 2021: 114 · 2020: 78 · 2019: 61 · 2018: 54 · 2017: 51 · 2016: 49 · 2015: 14
- FWCI
- 50.68
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Proceedings of the National Academy of Sciences (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Science Foundation (EF-1241889, 1144244)
- HHS | National Institutes of Health (R01GM109499, F32AI112255)
- U.S. Department of Agriculture (NRI 2006-01370, 2009-35102-0543)
- U.S. Environmental Protection Agency (CAREER 83518801)
- Topics
- Life Sciences › Immunology and Microbiology › Parasitology › Parasite Biology and Host Interactions
- Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Zoonotic diseases and public health
- Physical Sciences › Environmental Science › Nature and Landscape Conservation › Ecology and Vegetation Dynamics Studies
- Keywords
- dilution effect, biodiversity, parasite abundance, host diversity, zoonoses, disease risk, host-parasite interactions, plant-herbivore interactions, herbivory, biodiversity loss, human disease, wildlife disease
- MeSH terms
- Animals, Disease Susceptibility, Host-Parasite Interactions, Humans, Parasitic Diseases, Biodiversity
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