Download scientific diagram | Pulsos de ecolocalización de once especies de murciélagos insectívoros de Sierra de Huautla, Morelos. RPAR: R. parvula, MVE: . La ecolocación es un proceso por el cual los murciélagos (Orden Chiroptera) logran obtener información de su entorno, a través de ecos que provienen de. Resumen. El sistema de ecolocación es característico de los murciélagos del suborden Microquiróptera. A pesar de que el estudio de este sistema ha generado.

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Analysis of the echolocation calis and morphometry of a population of Myotis chiloensis Waterhouse, from the southern Chilean temperate forest.

BoxLa Paz, Bolivia. Echolocation is characteristic of bats of the suborder Microchiroptera. Though recent studies of echolocation calis in Latin America have generated significant advances in knowledge about distribution, habitat use and ecology of bats, the recording and analysis of bat calis is barely known in Chile.

During Januarywe obtained 22 records from captured and 75 records from fiying individuals. The analysis of calis in searching phase showed that the terminal frequency for this species is The contribution of new morphometric data from captured and released individuals indicates differences from previous studies. The records and acoustic analysis establishes a baseline for more detailed future ecological investigation of this and other bat species in Chile.

Myotis chiloensis, echolocation, morphometrics, bats, Chiroptera, temperate rainforest, Chile. En enero defueron obtenidas 22 grabaciones de llamadas de individuos capturados y 75 llamadas de individuos en vuelo. Chiropterans bats are known to provide significant services to agriculture, especially for controlling pest insects, pollinators and seed dispersers Wickramasinghe et al.

An alternative method to study bats, that is potentially less biased, involves detection of the ultrasonic echolocation calis that the Microchiroptera use for night-flight guidance Kalko and Schnitzler, ; Kunz and Racey, Echolocation was first described by Griffinand extensively updated by Korine and Kalko Bats emit pulses of ultrasound and compare these pulses with patterns of echoes generated by the environment.

These echoes rebound off solid objects or prey, providing detailed infor-mation about distance, shape, size, etc. Bat species have developed different types of calis, according to the different environments they inhabit, the prey available and the characteristic development of each species and their particular auditive systems Kalko and Schnitzler, ; Kalko and Schnitzler, ; Korine and Kalko, The frequency range, shape and duration of the calis vanes between species Murray et al.

The calis are usually characterised as three phases Neuweiler, ; Schnitzler et al. This last phase is not observed in bats that obtain their food from the ground, like soms Myotis spp. The terminal phase is typical of species specialised in hunting airborne prey Siemers and Schnitzler, In Chile, 11 bat species have been described, all belonging to the suborder Microchiroptera, with six of them belonging to the Vespertilionidae family, of which two belong to the genus Myotis Canals and Cattan, ; Iriarte, The members of this family are small, presenting a face free from visible ornaments as leafed nose Vargas,uropatagium or a well-developed tail membrane, and have a mainly insectivorous diet Moya et al.

It bat with the most southerly distribution recorded to date Mann, ; Galaz et al. During daytime, it hides in a wide range of sites, such as bark fissures, the roofs and walls of houses and rocky caves Iriarte, A study was developed to record and analyze the ultrasound calis emitted by M.


In addition, new morphometric data are presented obtained from live individuals, which are compared to morphometric data from previous studies. Acoustic calis and morphometrics of M. The study site was located in a zone of horticultural cultivation and fruit trees set in a predominantly wooded matrix.

The area has a high rainfall temperate climate with Mediterranean influence, where the precipitation is distributed through the whole year. The annual average temperature is 9.

A small colony of bats in the roof space of a house was identified. Two mist nets were set up, 3 and 6 m longat 1 m from the soil and at a distance of 2 m from the house during a period of 5 days, for a 2-hour period per night. In all, we carried out a total capture effort of 90 net linear metre hours. The captured bats were placed in cloth bags and were determined as M. For the recording of echolocation calis, the method chosen by Barboza ecolocapizacion al.

Ecolkcalizacion record flight calis, one person would set a bat free, while another, standing 5m away, would record the bat calis in search phase. Spetch, Germanyusing a The best quality files recorded from the individuals captured in the nets were used for the calis characterization.

We captured 12 bats using the mist nets, of which 11 were found to be M. Capture effort for M. Additionally, the morphometric values reported inprevious studies for M.

A total of 22 audio files were obtained from the 11 captured individuals. A further mrcielagos files were recorded of wildbats at the capture site.

Ecolocación del murciélago

The 12 files with the best recording quality were used for the analysis of the captured individuals. These calis include the search, approximation and terminal phases Figure 1.

The analysis of the echolocation calis in search phase is presented in Figure 2. This analysis showed an average frequency of In the initial FM phase, a wide variation in the frequency is observed over a short period of time.

During the second QCF phase, the cali lremains in a very limited frequency range for a longer period of time. This study provides new morphometric information and, for the first time in Chile, the echolocation calis of M.

This could occur because the values described by those studies were obtained from embalmed individuals, and thus may have experienced some variation as a result Torres-Mura, personal communication.

Alternatively, the variations might be due to geographical variation in this species Canals et al. The standard deviation of the measurements of total length Likewise, the values obtained for the forearm length These measurements are easier in the field and have lower standard deviation. Some data are reported in this study, such as right foot length 7.

They represent new morphometric records for this species. The implication of the differences recorded in the morphometric data is that either there exists more than one subspecies or that there is incompatibility between the in vivo measurements and the measurement of dead, preserved specimens.

Accordingly, the development of a protocol that allows standardizing the measurements is still necessary, to make reliable comparisons throughout the country. The calis ecolocallizacion M. These bats capture flying insects and have the agility to navigate between obstacles Schnitzler and Kalko, The FM component allows bats to detect objects precisely, as long murcielagoa they are not very small Schnitzler et al. FM is used to navigate, measure distances and avoid obstacles, achieving a high resolution of objects and surfaces Kalko and Aguirre, On the other hand, the quasi-constant frequency muecielagos to an adaptation of the component of constant frequency CFwhich is used to differentiate insects from dense vegetation.


The quasi-constant frequency is used to locate insects in open environments, away from obstacles Schnitzler and Kalko, The strength of the echo will depend on the angle of the insect wings relative to the direction of the bat Kalko and Aguirre, As the CF component is extended over time, the echo contains several flapping cycles of the insect, indicating its position and speed Kalko and Aguirre, Only the terminal frequency of M.

This is because the lowest frequencies are less subject to atmospheric attenuation Kalko and Schnit-zler, Therefore, a bat with FM type calis passing at seven meters from the microphone will have an initial frequency lower than one bat passing at three meters Fenton and Bell, A negative relation has been described between the frequency of the calis in search phase and the size of the bat Jones, The acoustic analysis allowed us to describe the distinctive characteristics of the calis of M.

We were able to record some basic information about behavioural ecology, observing it to hunt low around vegetation. Use of ultrasound detectors opens the possibility to record new species flying higher and mufcielagos are still undetected by traditional methods Barboza et al. The creation of a complete ultrasound library of the bat species present in the country is still necessary.

Once established, we will be able to make a more complete record of the distributions of the different chiropterans present in Chile. Also thanks to Juan Carlos Torres-Mura of the Museo Nacional de Historia Natural for allowing access to the literatee and for his comments during the terminal phase of this study.

Use of ultrasound detectors for bat studies in Europe: Effect of acoustic clutter on prey detection by bats. Molossidae y Myotis chiloensis Chiroptera: Nurcielagosrepresentantes de dos diferentes patrones de vuelo. Ej Chilena de Historia Natural Canals, and P Cattan eds.

Bioacústica – RELCOM – Red Latinoamericana y del Caribe para la conservación de los Murciélagos

Editorial Universitaria, Santiago, Chile. Betke, P Federico, J. Economic value of the pest control service provided by Brazilian Free-tailed bats in south-central Texas.

Frontiers in Ecology and the Environment 4 5: Brazilian free-tailed bats as insect pest regulators in transgenic and conventional cotton crops.

Ecological Applications 18 4: Activity patterns, habitat use, and prey selection by some African insectivorous bats. Recognition of species of insectivorous bats by their echolocation calis.

Journal of Mammalogy 62 2: Scaling of echolocation cali parameters in bats. The Journal of Experimental Biology The echolocation and hunting behavior of Daubenton’s bat, Myotis daubentoni.

Behavioral Ecology and So-ciobiology 24 4: Plasticity in echolocation signals of European pipistrelle bats in search flight: Behavioral Ecology and Sociobiology 33 6: Toward global bat-signal Database.