Capture Efficiency of Torrent Ducks by the Active Mist-Net Method

Authors
Alza, Luis; Bautista, Emil; Smith, Matthew; Gutierrez Pinto, Natalia; Astié, Andrea Alejandra; McCracken, Kevin G.
Publication Year
2017
Language
English
Format
article
Status
Published version
Description
We report on the use and efficiency of an active mist-net method for capturing 3 subspecies of torrent ducks (Merganetta armata), a territorial and specialized South American waterfowl, in fast-moving rivers of the Andes Mountains. As an active process, the execution of this methodology required the presence of a well-trained, 3-person team. During the austral winter and spring between 2010 and 2014, we captured 372 torrent ducks in 410 capture events on 8 different rivers in Colombia (n = 1), Peru (n = 5), and Argentina (n = 2). Each captured torrent duck was banded and 32 opportunistic recaptures were obtained using the same methodology in the same territories. We deployed the mist-net across fast-moving deep rivers, along elevational gradients (680?4,200 m). Males were more easily captured than females, because of their greater tendency to fly. Our data validated this capture method for torrent ducks, as we succeeded in capturing individuals of the 3 subspecies in different habitats at different elevations and latitudes. To avoid animal mortality, we recommend application of this method only when 3 minimal conditions are met: 1) each field crew has at least 3 people; 2) all of the crew members have hand-radios to enable continuous communication, and 3) each crew member has received prior training (e.g., installation, inspection, manipulation and removal of the mist net, bird extraction, and familiarity with the behavior of the ducks).
Fil: Alza, Luis. University Of Miami. Department Of Biology; Estados Unidos. University of Alaska Fairbanks. Institute of Arctic Biology. Department of Biology and Wildlife; Estados Unidos
Fil: Bautista, Emil. Centro de Ornitología y Biodiversidad; Perú
Fil: Smith, Matthew. University of Alaska Fairbanks. Institute of Arctic Biology. Department of Biology and Wildlife; Estados Unidos
Fil: Gutierrez Pinto, Natalia. University Of Miami. Department Of Biology; Estados Unidos
Fil: Astié, Andrea Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Provincia de Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Universidad Nacional de Cuyo. Instituto Argentino de Investigaciones de las Zonas Áridas; Argentina
Fil: McCracken, Kevin G.. University of Alaska Fairbanks. Institute of Arctic Biology. Department of Biology and Wildlife; Estados Unidos. University Of Miami. Department Of Biology; Estados Unidos
Subject
ANDES
CAPTURE
DIVING DUCK
MERGANETTA ARMATA
MIST NEST
RIVERS
TORRENT DUCK
WATERFOWL
Otras Ciencias Biológicas
Ciencias Biológicas
CIENCIAS NATURALES Y EXACTAS
Access level
Restricted access
License
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/43609