Cited by 763Parasite Biology and Host InteractionsZoonotic diseases and public healthEcology and Vegetation Dynamics Studies

Biodiversity inhibits parasites: Broad evidence for the dilution effect

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Civitello, David J., Cohen, Jeremy, Fatima, Hiba, Halstead, Neal T., Liriano, Josue, McMahon, Taegan A., Ortega, C. Nicole, Sauer, Erin Louise +3 more·2015·Proceedings of the National Academy of Sciences

Abstract

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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Crossref · 10.1073/pnas.1506279112

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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, supporting the generality of this relationship across nonzoonotic disease systems as well.

    “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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  • Biodiversity loss has been shown to often increase the risk of zoonotic diseases, for example, through the dilution effect.

    “In contrast, biodiversity loss has been shown to often increase the risk of zoonotic diseases, for example, through the dilution effect (9).”

    From Impacts of biodiversity and biodiversity loss on zoonotic diseases (2021) · cites this paper as [9]

    The Results and Discussion report strong evidence that biodiversity reduces the abundance of zoonotic parasites. The paper says biodiversity declines *may* consequently increase human disease risk; it does not establish that such declines have often increased zoonotic disease risk in humans. (LLM, conf=0.85)

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  • Under some conditions, high biological diversity can decrease the transmission of zoonotic diseases that have already become established.

    “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).”
  • A larger metaanalysis found that the dilution effect was as strong for zoonoses as for other types of diseases, a conclusion robust to criticisms from the authors of the earlier study.

    “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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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)
Venue
Proceedings of the National Academy of Sciences
Published
2015-06-11
Volume
112
Issue
28
Pages
8667-8671
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W1787861744
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 · 2014: 2
FWCI
50.68
Type
journal article
Language
en
Open access
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
  • Physical Sciences › Environmental Science › Ecology › 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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