Valoración de los radiotransmisores sobre crotal en el seguimiento de ponis salvajes

  1. Lagos Abarzuza, Laura
  2. Bárcena, Felipe
Journal:
Galemys: Boletín informativo de la Sociedad Española para la conservación y estudio de los mamíferos

ISSN: 1137-8700

Year of publication: 2010

Issue Title: V Congreso Mundial sobre Ungulados de Montaña

Volume: 22

Issue: 1

Pages: 113-122

Type: Article

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More publications in: Galemys: Boletín informativo de la Sociedad Española para la conservación y estudio de los mamíferos

Abstract

This work sets out an assessment of the field use of ear-tag radio transmitters. Between June 2007 and October 2009, we followed the juvenile mortality of a wild pony Equus caballus population in me centre of Galicia, NW Spain, with the help of ear-tag radio transmitters. Wolf, Canis lupus, predation is the major cause of mortality of me foals. We used 14 radio transmitters equipped with mortality sensor to tag 32 ponies. Some radio transmitters were used on up to 4 different ponies. Transmitter radio frequencies were monitored on a daily basis. In comparison to other wild ungulates, ponies can be individually recognized and easily studied by direct observation. Every fortnight we visually inspected and took photos of the ponies, which allowed us to check the status of me radio transmitters. The average duration of me batteries was 364 days, 4 months less than the technical specifications stated. A 38% of the rags fell off: 57% of the rags fitted on the outside of the ear and 22% of those fitted on the inside. In addition, 11 % of the tags fitted on the inside the ear broke: 2 out of the 14 rags used, after a minimum of 148 days of use. The appropriate fitting of the rags in me central inner pare of the ear minimized me tags fall off frequency. All the original antennas broke between 22-173 days after the installation of the radio transmitters in the foals. This significantly decreased me range of me transmitter radio signal. The use of more robust antennas resolved this problem although the equipment weight increased 18.8%. The high rates of antennas breakages and rag full offs could be partially related with to type and density of the vegetation in our study area.

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