Echolocation of the big red bat<i>Lasiurus egregius</i>(Chiroptera: Vespertilionidae) and first record from the Central Brazilian Amazon

López‐Baucells, Adrià; Rocha, Ricardo; Fernández-Arellano, Gilberto; Bobrowiec, Paulo Estefano Dineli; Palmeirim, Jorge M.; Meyer, Christoph F. J.

doi:10.1080/01650521.2014.907600

Cited by 10 publications

(9 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Upon release, this animal spent several minutes flying in a semi-open area, thus providing highquality semi-natural flying sequences. Good echolocation recordings of free flying bats under natural conditions are missing for many species (especially those inhabiting remote tropical regions) (López-Baucells et al 2014) and are vital for creating reliable reference call libraries.…”

Section: Discussionmentioning

confidence: 99%

Rapid assessment of bat diversity in the Taita Hills Afromontane cloud forests, southeastern Kenya

López‐Baucells

Rocha

Webala

et al. 2016

Barb

View full text Add to dashboard Cite

Tropical mountain ranges are known to support high biodiversity. In addition to their role as refuge habitat, complex topography within these ecosystems promotes the development of diverse species traits and evolutionary divergence. However, species within these environments also face severe anthropological threats, most notably from habitat loss and degradation, invasive species, and climate change. A primary example is the Taita Hills in Kenya, which forms the northernmost portion of the biodiversity rich Eastern Arc Mountains. Despite the high biodiversity potential for the area, little is known regarding chiropteran diversity. In order to address this lack of knowledge, we conducted a rapid biological survey of bats during January-February 2016. Our trapping effort was focused on different habitat types (e.g. highland cloud rainforest fragments, lowland riverbeds and human structures) and diverse trapping methods were used (e.g. mist-netting and hand-netting). A total of 169 bats belonging to at least 19 species from 7 different families were captured across 16 sampling sites. We report 10 new species records for the Taita Hills region, including the first record of Miniopterus mossambicus for East Africa, with a major range expansion in its distribution, as well as the first echolocation call for Glauconycteris argentata in eastern Africa. Several cases of probable species complexes were also identified, which are the focus of ongoing molecular work. Together, our results demonstrate that the Taita Hills region is home to rich bat diversity, not yet completely assessed, and emphasizes the urgent need to conserve the remaining forest fragments.

show abstract

Section: Discussionmentioning

confidence: 99%

Rapid assessment of bat diversity in the Taita Hills Afromontane cloud forests, southeastern Kenya

López‐Baucells

Rocha

Webala

et al. 2016

Barb

View full text Add to dashboard Cite

show abstract

“…In the Neotropics, in contrast to phyllostomid bats, aerial insectivores are rarely captured in mist-nets (MacSwiney et al 2008) and therefore, although they represent a high proportion of Neotropical bat diversity (Jung & Kalko 2011), the ecology of many species remains elusive and their echolocation calls poorly described (e.g. López-Baucells et al 2014;López-Baucells et al 2017a). In fact, despite enormous recent advances in recording technology and equipment, comprehensive regional bat reference call libraries are currently lacking for much of the tropics (Walters et al 2013;Madhukumar Menon et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Stronger together: Combining automated classifiers with manual post-validation optimizes the workload vs reliability trade-off of species identification in bat acoustic surveys

López‐Baucells

Torrent

Rocha

et al. 2019

Ecological Informatics

Self Cite

View full text Add to dashboard Cite

Owing to major technological advances, bioacoustics has become a burgeoning field in ecological research worldwide. Autonomous passive acoustic recorders are becoming widely used to monitor aerial insectivorous bats, and automatic classifiers have emerged to aid researchers in the daunting task of analyzing the resulting massive acoustic datasets.However, the scarcity of comprehensive reference call libraries still hampers their wider application in highly diverse tropical assemblages. Capitalizing on a unique acoustic dataset of more than 650,000 bat call sequences collected over a 3-year period in the Brazilian Amazon, the aims of this study were (a) to assess how pre-identified recordings of free-flying and hand-released bats could be used to train an automatic classification algorithm (random forest), and (b) to optimize acoustic analysis protocols by combining automatic classification with visual post-validation, whereby we evaluated the proportion of sound files to be postvalidated for different thresholds of classification accuracy. Classifiers were trained at species or sonotype (group of species with similar calls) level. Random forest models confirmed the reliability of using calls of both free-flying and hand-released bats to train custom-built automatic classifiers. To achieve a general classification accuracy of ~85%, random forest had to be trained with at least 500 pulses per species/sonotype. For seven out of 20 sonotypes, the most abundant in our dataset, we obtained high classification accuracy (>90%). Adopting a desired accuracy probability threshold of 95% for the random forest classifier, we found that the percentage of sound files required for manual post-validation could be reduced by up to 75%, a significant saving in terms of workload. Combining automatic classification with manual ID through fully customizable classifiers implemented in open-source software as demonstrated here shows great potential to help overcome the acknowledged risks and biases associated with the sole reliance on automatic classification.

show abstract

“…The species has uniform reddish coloration with hair covering the first third of the well-developed uropatagium (Gardner and Handley 2008;Díaz et al 2016). Its ears are slightly wider than long, and the inner edge of the tragus is straight, while the outer rim is curved (López-Baucells et al 2014). The forearm ranges from 48 to 50 mm long (Emmons and Feer 1997;Lim and Engstrom 2001).…”

Section: Introductionmentioning

confidence: 99%

“…The dental formula is as follows: incisors 1/3, canine 1/1, premolars 1/2 and molars 3/3 (Bianconi and Pedro 2007). Little is known about L. egregius, such as geographical range, population size and other information (López-Baucells et al 2014), which may contribute to this species' classification as Data Deficient by the IUCN (Sampaio et al 2016).…”

Section: Introductionmentioning

confidence: 99%

“…In Brazil, L. egregius has records from all regions, in the states of Amazonas (López-Baucells et al 2014), Pará (Kalko and Handley 2001), Roraima (Capaverde-Junior et al 2014), Pernambuco (Sousa et al 2004, Silva 2007, Minas Gerais (Stutz et al 2004), Santa Catarina (Cherem et al 2004), and Rio Grande do Sul (Giménez and Gianinni 2011). This species was recorded in urban areas and natural habitats (Lima 2008;Pacheco et al 2010), which suggests that it has greater ecological tolerance.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

First record of Lasiurus egregius (Peters, 1870) (Chiroptera, Vespertilionidae) in Paraná state, southern Brazil

Carvalho¹,

Bôlla²,

Supi³

et al. 2019

CheckList

View full text Add to dashboard Cite

Lasiurus egregius (Peters, 1870) is an insectivorous bat species known from Central and South America. This species has few confirmed records throughout its distribution. Here we report the first record of L. egregius from the northern coast of Paraná state, southern Brazil. We captured a female individual of L. egregius using an ultrathin mist-net installed over a river knee, at Salto Morato Natural Reserve, municipality of Guaraqueçaba. This is the fourteenth locality with confirmed occurrence of L. egregius, being eight of them in Brazil. The knowledge on the bat fauna in Paraná has been increasing in recent decades, mainly due to the new studies in coast areas of this state. In addition to contributing to the knowledge of the bat fauna from Paraná, the new record of L. egregius reinforces the essential role of the Salto Morato Natural Reserve in conserving bats in the southern portion of the Atlantic Forest.

show abstract

Echolocation of the big red batLasiurus egregius(Chiroptera: Vespertilionidae) and first record from the Central Brazilian Amazon

Cited by 10 publications

References 17 publications

Rapid assessment of bat diversity in the Taita Hills Afromontane cloud forests, southeastern Kenya

Rapid assessment of bat diversity in the Taita Hills Afromontane cloud forests, southeastern Kenya

Stronger together: Combining automated classifiers with manual post-validation optimizes the workload vs reliability trade-off of species identification in bat acoustic surveys

First record of Lasiurus egregius (Peters, 1870) (Chiroptera, Vespertilionidae) in Paraná state, southern Brazil

Contact Info

Product

Resources

About

Echolocation of the big red batLasiurus egregius(Chiroptera: Vespertilionidae) and first record from the Central Brazilian Amazon

Cited by 10 publications

References 17 publications

Rapid assessment of bat diversity in the Taita Hills Afromontane cloud forests, southeastern Kenya

Rapid assessment of bat diversity in the Taita Hills Afromontane cloud forests, southeastern Kenya

Stronger together: Combining automated classifiers with manual post-validation optimizes the workload vs reliability trade-off of species identification in bat acoustic surveys

First record of Lasiurus egregius (Peters, 1870) (Chiroptera,&nbsp;Vespertilionidae) in Paran&aacute; state, southern Brazil

Contact Info

Product

Resources

About

First record of Lasiurus egregius (Peters, 1870) (Chiroptera, Vespertilionidae) in Paraná state, southern Brazil