SLTDRSatellite Linked Time Depth Recorders
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Data on movement, horizontal velocity ([ms.sup.-1]), dive depth (m), and dive rate (dives [h.sup.-1]) were obtained from 39 bowhead whales (31 females, 6 males, and 2 of undetermined sex) instrumented with satellite-linked time-depth recorders (SLTDRs) in spring 2009 and 2010 in Disko Bay, West Greenland.
Adult bowhead whales (> 13 m in length, George et al., 2004) were instrumented with satellite-linked time-depth recorders (SLTDRs) during March-May in 2009 and 2010 from Qeqertarsuaq (Disko Island, West Greenland, Fig.
We used 0.5-watt ST-6 SLTDRs (packaged by Wildlife Computers, Redmond, WA), which provide dive depth, dive duration, and transmitter status.
The ST-6 SLTDRs were on 24 h/day and transmitted a maximum of 400 transmissions/day.
Trip duration was measured for 10 of 25 animals with SDRs containing time-line data (it was not possible to calculate trip duration for 15 SDRs with the earlier SLTDRs that did not transmit time-line data).
In another study, adult females in Alaska were equipped with early-style SLTDRs that had features that recorded time-depth information and these SLTDRs showed that the females frequently dived to 200 m or more (Merrick et al., 1994).
The highlight of the 1999 field season was the successful deployment of a SLTDR on a young male beluga.
5), and 10 min later, the whale rejoined a group milling nearby (see Appendix for further details of SLTDR attachment).
Preliminary results from SLTDR data for this animal suggest that belugas remain in the upper inlet over much of the summer (Fig.
In upper Cook Inlet, three seasons of learning were required before a SLTDR was successfully attached in 1999.
A total of 110 days of data were received from the SLTDR before the signal was lost in early September.