Article

Results of a small terrestrial mammal survey in the remote Boé region of Guinea‐Bissau, with discovery of two new shrew records for the country

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  • Silvavir ecologisch advies
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Abstract

The Boé region in the south‐east of Guinea‐Bissau has remained untouched by large‐scale human influence and development due to its isolated location. The region consists mainly of savannah interspersed with gallery forests and hosts a unique and valuable biodiversity though very little is known of small terrestrial mammal diversity. In 2013, a terrestrial small mammal live trapping survey was conducted around Béli, a small village in the South of the Boé region. Five survey locations of three ecotypes were selected, and a combination of pitfall traps and live traps was used to capture and release small mammals. A selection of mammals that could not be identified as well as accidental mortalities in the traps were collected as voucher specimens and sent to Naturalis Biodiversity Center in the Netherlands. Over 96 survey days, a total of 331 small terrestrial mammals were trapped from 21 unique species, which include two new species records for the country: shrew species Crocidura lamottei and Crocidura crossei . Extrapolation from species accumulation curves suggested an overall species richness of 22 species for the region, with substantial differences in community composition among sampled habitats. The results of this study are an important part of the scientific record for small terrestrial mammals in the Boé region and set a baseline reference for future conservation efforts.

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... pers.). This was the reason why some investigators did not use this trap until recently in their small mammal studies (Westra et al. 2022;Torre and Palau 2023), but none of them has attempted to test the performance of this trap compared to the more traditional and standard live trapping models. Indeed, this trap model was not included as a sampling option for mice in recent trapping practical guides (Sikes and Animal Care and use Committee of the American Society of Mammalogists, 2016; Machtinger and Williams 2020). ...
... Our goal in this study was to perform a test of the efficacy of the Heslinga trap in field conditions, by comparing its performance with the medium-sized Sherman trap, a widely used live trapping model recommended for small mammal sampling in the study area and elsewhere (Machtinger and Williams 2020;Torre et al. 2021). Due to the similar design, the Heslinga and Longworth traps are expected to have similar performance, and the former could be used as an alternative to the latter working alone or in combination with other trap models to maximize capture probability (McCarthy et al. 2021;Westra et al. 2022;Torre and Palau 2023). If this was true (i.e., Heslinga = Longworth), we will expect a similar performance of the Heslinga trap when compared to the Sherman trap, as was observed in Longworth/Sherman comparisons (Morris 1968;Torre et al. 2018;Eleftheriou et al. 2020). ...
... The Heslinga trap showed a similar design than the Longworth trap, and despite specific tests between both model traps are needed, a similar performance could be expected. Actually, some authors used this trap as a natural substitute of the Longworth despite no field tests were performed to confirm its efficacy (Westra et al. 2022). Nonetheless, the Heslinga trap can be considered an improvement of the Longworth (Boekel 2014;Torre et al. 2021), and our results suggested that the former could outperform the latter. ...
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