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Nests of Marsh Harrier (Circus aeruginosus L.) as Refuges of Potentially Phytopathogenic and Zoopathogenic Fungi

Summary

This research examined how birds’ nests, specifically those of Marsh harriers, can harbor dangerous fungi that could affect both wildlife and humans. The study found that these nests contain large numbers of potentially harmful fungi that could cause diseases in plants, animals, and humans. Impact on everyday life: • Highlights potential health risks for people living or working near wetland areas where these birds nest • Demonstrates how wildlife habitats can serve as reservoirs for disease-causing organisms • Shows the importance of proper protective measures when handling or working near bird nests • Helps understand the spread of fungal diseases in agricultural areas near wetlands • Provides insights for better wildlife management and public health practices

Background

Birds’ nests are specific microhabitats that host various fungal species. Nests constructed on wet soil or water plants are characterized by high humidity (80-90%) and elevated temperatures during breeding (35-38°C), making them attractive for hydrophilic fungi. The accumulation of plant biomass enriched with feather keratin promotes the development of cellulolytic, keratinolytic and ubiquitous fungi.

Objective

To analyze the diversity of mycobiotas in nests of Marsh harriers with special focus on opportunistic potential human pathogens, phytopathogens, and animal pathogens.

Results

From 2449 fungal isolates obtained, 96.8% were filamentous fungi representing 37 genera and 63 species. Among these, 46 species (72%) were potentially pathogenic, with 18 species being phytopathogenic and 32 species pathogenic for homoiothermous animals. Key pathogenic species included Aspergillus fumigatus, A. flavus, Scopulariopsis brevicaulis, and various Fusarium species. The total number of fungi reached or exceeded 107 CFU/g dry matter of nest material.

Conclusion

Marsh harrier nests serve as significant refuges for potentially pathogenic fungi affecting both plants and animals. The high numbers of pathogenic fungi, particularly A. fumigatus and A. flavus, indicate these nests are both a source of fungal infections for the birds and an important link in the epidemiological cycle of opportunistic fungi affecting humans.
  • Published in:Saudi Journal of Biological Sciences,
  • Study Type:Ecological Survey,
  • Source: 10.1016/j.sjbs.2017.03.016
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