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Comparing the efficiency of monofilament and regular nets for capturing bats
Silvia Chaves-Ramírez1, Christian Castillo-Salazar1, Mariela Sánchez-Chavarría2
1Escuela de Biología, Universidad de Costa Rica, San Pedro, Costa Rica.
Royal Society Open Science
|December 15, 2021
Summary
Monofilament mist nets capture more bat species, including rare insectivorous bats, than traditional nylon nets. This study shows monofilament nets improve bat diversity assessments and understanding of bat populations.
Area of Science:
- * Wildlife biology
- * Mammalogy
- * Ecological sampling methods
Background:
- * Standard nylon or polyester mist nets are commonly used for bat capture but show limitations in sampling efficiency, especially for insectivorous species.
- * Previous research on monofilament nets for bat studies yielded surprising results, suggesting lower efficiency compared to traditional nets.
- * There is a need for further investigation into the comparative effectiveness of monofilament versus regular mist nets in bat surveys.
Purpose of the Study:
- * To provide additional evidence on the differences in sampling efficiency between monofilament and regular mist nets for bat research.
- * To evaluate the impact of net type on the capture rates of various bat species, including insectivorous and rare ones.
- * To assess the influence of net type on estimations of bat species diversity and community composition.
Main Methods:
- * Comparative field study employing both regular mist nets and monofilament mist nets for bat capture.
- * Quantification of captured individuals and species richness for each net type.
- * Analysis of species accumulation curves to compare diversity estimates between the two sampling methods.
Main Results:
- * Monofilament nets captured a higher number of individuals (125) and species (20) compared to regular nets (90 individuals, 14 species).
- * The use of monofilament nets significantly increased overall capture rates, with a notable improvement for insectivorous bat species.
- * Species accumulation curves revealed that regular nets substantially underestimate species diversity, particularly by failing to capture rare species.
Conclusions:
- * Monofilament mist nets are more effective than regular nets for sampling bat assemblages, offering higher capture rates and better representation of species diversity.
- * Incorporating monofilament nets into bat research can expand records of different bat guilds and rare species.
- * This sampling method enhances the understanding of poorly documented bat communities while remaining a practical and accessible technique.
