Cited by 3Environmental Toxicology and EcotoxicologyFreshwater macroinvertebrate diversity and ecologyFire effects on ecosystems

Exposure to grassland fire ash alters the life-history traits and causes morphological deformities in the aquatic insect Chironomus xanthus

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Araujo, Ronnilda Maria Gonçalves, Pacheco, Diogo Ramos, Schafascheck, Ana Marta, Bezerra, Cinara Wanderléa Felix, Navarro-Silva, Mario Antonio, Pinho, Luiz Carlos, Figueiredo, Bruno Renaly Souza·2025·Environmental Pollution

Abstract

Wildfires generate large amounts of ash that can contaminate watercourses, with potentially harmful effects on aquatic biodiversity that are not fully understood. This study experimentally evaluated the influence of environmentally relevant concentrations of grassland ash on aquatic biota, using the freshwater non-biting midge Chironomus xanthus as a model organism. Specifically, we assessed the toxicity of ash on oviposition and emergence patterns, changes in body and head capsule sizes, and deformities in the mentum and mandible of 4th-instar larvae and the wings of adult C. xanthus. The tested ash concentrations were 0, 0.01, 0.1, 1, and 10 g/L, allowing, for the first time, the use of a geometric morphometric approach to evaluate deformities in immature and adult chironomids as sublethal implications of ash exposure. Our results showed a concentration-dependent decrease in the proportion of individuals undergoing pupation and emerging as adults. In addition, water contamination by ash led to reduced body size and more frequent morphological deformities in larval mouthparts, with a consistent narrowing pattern in the mentum at ash concentrations. Geometric morphometry also revealed that males' and females' wings were significantly smaller and narrower, with females exhibiting asymmetries between the right and left wings under higher ash concentrations. These findings demonstrate that environmentally relevant concentrations of grassland ash impair the development of C. xanthus larvae and adults, reducing body size and reproductive capacity. Given the key ecological role of chironomids as prey for higher trophic levels and as benthic ecosystem engineers, such impairments raise concerns about population declines and potential disruptions to freshwater food web dynamics after grassland fires.

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Crossref · 10.1016/j.envpol.2025.126694

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Authors
Araujo, R. M. G., Pacheco, D. R., Schafascheck, A. M., Bezerra, C. W. F., Navarro-Silva, M. A., Pinho, L. C., & Figueiredo, B. R. S.
Affiliations
  • Universidade Federal de Mato Grosso (BR)
  • Universidade Federal do Paraná (BR)
  • Universidade Federal de Santa Catarina (BR)
Corresponding author
Araujo, Ronnilda Maria Gonçalves
Venue
Environmental Pollution
Publisher
Elsevier BV
Published
2025-10
Volume
382
Pages
126694
ISSN
0269-7491 (ISSN-L)
OpenAlex
W4411365302
Cited by
3
References
106
Citations by year
2026: 2 · 2025: 1
FWCI
1.27
Type
journal article
Language
en
Update notices
erratum (2025-11-01)
Open access
Locations
  • Environmental Pollution (publishedVersion)
  • SSRN Electronic Journal (acceptedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Environmental Toxicology and Ecotoxicology
  • Physical Sciences › Environmental Science › Ecology › Freshwater macroinvertebrate diversity and ecology
  • Physical Sciences › Environmental Science › Global and Planetary Change › Fire effects on ecosystems
Keywords
life-history traits, morphological abnormalities, body size reduction, pupation and emergence, sublethal effects, geometric morphometrics, freshwater food webs
MeSH terms
Life History Traits, Animals, Chironomidae, Female, Fires, Larva, Male, Water Pollutants, Chemical, Coal Ash, Grassland

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