Birds trapped in mist nets killed by opportunistic predators in a forest in Southwestern Amazonia

Guimarães, David Pedroza; Lima, Jônatas; Souza, Vanessa Lima de; Guilherme, Edson

doi:10.34019/2596-3325.2020.v21.28868

Cited by 4 publications

(7 citation statements)

References 8 publications

(12 reference statements)

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“…However, some countries (e.g., Brazil and Kenya) had more opportunistic predation records than others (e.g., Colombia and Thailand), mainly for birds. This result indicates that in Brazil, for example, researchers report more opportunistic predations that occur in mist nets (e.g., Breviglieri & Pedro, 2010; Carvalho et al, 2016; Curcino et al, 2009; Gallego et al, 2021; Guimarães et al, 2020; Serra‐Gonçalves et al, 2017). Also, the results compiled from long‐term sampling carried out by LADIM reinforce that predation of this kind is more common than reporting levels would suggest, and by extension that globally, there seems to be a large gap for this type of record.…”

Section: Discussionmentioning

confidence: 88%

“…In addition, this type of predation may be occurring due to the nonuse of different recommendations and guidelines that can be found in the literature. (e.g., Carvalho et al, 2016;Gallego et al, 2021;Guimarães et al, 2020;Lowe, 1989;The North American Banding Council, 2001;Ralph et al, 1993;Serra-Gonçalves et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

“…The height at which the mist nets are set up, together with the interval between mist-net checks, has already been shown by different studies to be the main driver of the occurrence of opportunistic predation in birds and bats (see Carvalho et al, 2016;Gallego et al, 2021;Guimarães et al, 2020;Serra-Gonçalves et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

“…F I G U R E 3 Opportunistic predation records found in different countries: (a) Total opportunistic predation records; (b) opportunistic predation records on bats; and (c) opportunistic predation records on birds.mainly for birds. This result indicates that in Brazil, for example, researchers report more opportunistic predations that occur in mist nets (e.g.,Breviglieri & Pedro, 2010;Carvalho et al, 2016;Curcino et al, 2009;Gallego et al, 2021;Guimarães et al, 2020;Serra- Gonçalves et al…”

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confidence: 99%

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Global review and guidelines to avoid opportunistic predation of birds and bats in mist nets

de Moura,

Mustin,

Pinto

et al. 2023

Ecology and Evolution

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Mist nets are one of the most widely used techniques in the study of birds and bats worldwide. However, a number of risks are involved, including opportunistic predation. Given this potential cost, here we: (1) review the global literature to understand the factors that might contribute to predation risk for birds and bats captured in mist nets; (2) review existing guidelines for best practice use of mist nets; and (3) based on our reviews, recommend new guidelines for the use of mist nets to minimize the risk of opportunistic predation. Based on keyword in English, Spanish, Portuguese, and French, and using Google Scholar, Scopus, SciElo, and Web of Science, we found 48 articles reporting opportunistic predation. In the included articles, 178 predation events, involving 52 predator and 84 prey species, were reported. In most of the reports, the mist nets were placed at ground level, the bats and birds were preyed on from the shelf closest to the ground, the mist‐net checks occurred at intervals of 1 h or 30 min and the most common predators were arboreal and scansorial species (primates and marsupials). Despite the occurrences of predation in 13 countries, guidelines for best practice mist‐net use were found in only three, despite extensive searches and contact with key people in each country. Based on the existing guidelines and our results, we recommend that mist nets be fixed with the lowest shelf at least 50 cm above ground level and be checked at 15‐min intervals; when predators are observed near mist nets, the nets either be constantly observed, closed, or relocated; suppressed the vegetation around the mist nets; captured animals be removed from the mist nets as soon as possible, and more than one researcher/technician should be in the field at all times.

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Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Global review and guidelines to avoid opportunistic predation of birds and bats in mist nets

de Moura,

Mustin,

Pinto

et al. 2023

Ecology and Evolution

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“…To some extent, the percentages reported here could be influenced by the time intervals to check the mist nets, which ranged between 45 and 60 min, a very standard interval in Spain that is not recommended to exceed (Pinilla 2000). Frequency to check mist nets checks usually varies among studies according to environmental conditions (Pinilla 2000, Spotswood et al 2012b) or the presence of potential predators (Guimarães et al 2020), but intervals typically range between 30 and 60 min. One might argue that a shorter interval would have produced much lower percentages of interactions and seeds sampled on the mesh bands.…”

Section: Final Considerationsmentioning

confidence: 99%

Increasing efficiency and reducing bias in the sampling of seed–dispersal interactions based on mist‐netted birds

Rumeu

González‐Varo

Castro

et al. 2022

Oikos

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Efficient and unbiased sampling of ecological interactions is essential to our understanding of the functions they mediate. Seed dispersal by frugivorous birds is a key mutualism for plant regeneration and community dynamics. Mist-netting is one of the most widely used methods to sample avian seed dispersal through the identification of seeds in droppings of captured birds kept inside cloth bags. However, birds may drop seeds on the ground before being extracted from the net, leading to a fraction of missing information due to ineffective sampling. Worryingly, this fraction could be unevenly distributed across bird and plant species, leading to sampling biases. Here, we assess the effectiveness of using a 1-m wide mesh below mist nets to sample seeds dropped by entangled birds. We used data from birds mist-netted during one-yearround. We sampled nearly 50% of interaction events and 75% of dispersed seeds on the mesh band below the mist nets (i.e. lost information without this optimization). The proportion of seeds sampled on the mesh bands was not evenly distributed among bird species but strongly related to bird size, ranging from 57-63% in warblers to 84-94% in thrushes. Moreover, the proportion of seeds sampled on the mesh was negatively related to seed size, although this relationship was weaker. We also evaluated accumulation curves of species and pairwise interactions with increasing sampling effort, both with and without using the mesh bands. The number of seed species sampled increased by 21% when using the mesh bands and the number of pairwise interactions by 36%. Our findings provide strong evidence on how inefficient and biased traditional mist-netting can be for sampling community-wide seed-dispersal interactions. We thus urge the use of mesh bands in future studies to increase sampling effectiveness and avoid biases, which will ultimately improve our understanding of the seed dispersal function.

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Live decoys: an old but effective tool for attracting, capturing, and studying free-living passerines

et al. 2022

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Birds trapped in mist nets killed by opportunistic predators in a forest in Southwestern Amazonia

Cited by 4 publications

References 8 publications

Global review and guidelines to avoid opportunistic predation of birds and bats in mist nets

Global review and guidelines to avoid opportunistic predation of birds and bats in mist nets

Increasing efficiency and reducing bias in the sampling of seed–dispersal interactions based on mist‐netted birds

Live decoys: an old but effective tool for attracting, capturing, and studying free-living passerines

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