Tracking polar bears in the Beaufort Sea: June 2014 map

Here is the June 2014 follow-up to my post on the July 2013 track map for female polar bears being followed by satellite in the Beaufort Sea by the US Geological Survey (USGS) – “Ten out of ten polar bears being tracked this summer in the Beaufort Sea are on the ice.”

See that post for methods and other background on this topic, and some track maps from 2012 (also available at the USGS website here).

The USGS track map for June 2004 is copied below (Fig. 1).

Compare this to May’s map (Fig. 2) – the 20 bears from last month are down to 14, and all seven of the bears outfitted with glue-on satellite transmitters in April [either males or subadult animals] have either moved out of the area or their tags have fallen off or stopped transmitting. This means that all of the bears shown on the June map below are females with satellite radio collars.

Figure 1. From original caption: Movements of 14 satellite-tagged polar bears for the month of June, 2014. Polar bears were tagged in 2013 and 2014 on the spring-time sea ice of the southern Beaufort Sea. All fourteen of these bears have satellite collar transmitters. Polar bear satellite telemetry data are shown with MODIS [sea ice] imagery from 21 June, 2014.  Click on the above image to enlarge.

Figure 1. From original caption: “Movements of 14 satellite-tagged polar bears for the month of June, 2014. Polar bears were tagged in 2013 and 2014 on the spring-time sea ice of the southern Beaufort Sea. All fourteen of these bears have satellite collar transmitters. Polar bear satellite telemetry data are shown with MODIS [sea ice] imagery from 21 June, 2014.” Click to enlarge.

In April, there were 17 females, which means since then, three of the bears have either left the area or their collars have stopped working or fallen off.

Compare the locations through June above (Fig. 1) to those in May (Fig. 2, below), from previous post here.

Note that the circles with the polar bear icons are the end points (final positions for the month), while the tail ends of the strings are the positions at the first of the month.

Figure 2. From original USGS caption: “Movements of 20 satellite-tagged polar bears for the month of May, 2014. Polar bears were tagged in 2013 and 2014 on the spring-time sea ice of the southern Beaufort Sea. Fifteen of these bears have satellite collar transmitters and 5 of these bears have glue-on satellite transmitters. Polar bear satellite telemetry data are shown with MODIS imagery from 19 May, 2014. Click to enlarge. Original image here.

Figure 2. From original caption: “Movements of 20 satellite-tagged polar bears for the month of May, 2014. Polar bears were tagged in 2013 and 2014 on the spring-time sea ice of the southern Beaufort Sea. Fifteen of these bears have satellite collar transmitters and 5 of these bears have glue-on satellite transmitters. Polar bear satellite telemetry data are shown with MODIS imagery from 19 May, 2014.”
Click to enlarge. Original image here.

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