Sensor Data

This is the first time I’ve played at sensors and this is a very quick and dirty look a the data. There are 3 axis in the accelerometer data. The data is not always clean. I need to consult with Ornitila, there are often steps in the data where sensor seem to get fixed around a new level. Apparently it can be related to battery drain.

The first figure shows raw sensor data from the z-axis for 2 birds. Hen 210751 (blue) has a lot of noise (steps) that is not likely due to movement. For hen 210747 (red) the intensity the sensor collected data was much lower as the frequency the sensor collected data was tied to the battery status. This bird appears to have nested in dense cover and the battery was not recharing and had drained to about 30% by 19 May.

Z-axis sensor data for 2 birds.

In the second figure, I’ve quickly reset the sensor data from hen 210751 to a baseline of 0. As I say, this is quick and dirty - most of the large spikes in the sensor readings are due to the steps see in Figure 1 and not due to activity. However, the main purpose of this transformation was to make make it easier to see the changes in patterns as the bird actvity changes from moving arount to sedentary.

Z-axis sensor data for 210751 reset to baseline of 0.

Results for a Couple of Birds.

Hen 210746 was the first bird to initiate nesting and it looks like it compeleted incubation last weekend. Based on the GPS data this bird initiated nesting around 02:00 on 3 May (times in UTC), but the sensor data suggest it did not settle down until 08:00 on 4 May (black point on Fig. 3). The area defined by the light blue background outlines the period the sensor data suggest the bird was inactive or incubuating - about 24 days. This is followed by an increase in activity - I guess this corrisonds to hatch. The GPS indicates the bird did not leave the nest until ~22:00 on 29 May (red point, plot) is the first point where the GPS suggest the bird left the nest. I assume this hen is with a brood. Last we heard from her she was on an aquaculture site in side the bay (map)

All 3 sensor axis for 210746.

Next is an interactive map of hen’s 210746 track. You can zoom to a locaiton and if you hover over a point the date and time will popup.

Movements of hen 210746 though incubation and post-hatch.

For comparison I’ve plotted the sensor data for 2 hens. Figure 5 shows the sensor data hen 210748 that did not breed. She remained very active for the entire period making daily movements between the inner and outer part of the bay (plot).

All 3 sensor axis for 210748.

Movements of non-breeding hen 210748.

The sensor data for hen 210756. It appears the GSM fell off around 20 May. We loose the signal for most tags when they fall off but we are still getting data.

All 3 sensor axis for hen 210756

## [1] "adult"

## [1] NA

## [1] "2021-06-10 12:57:21 UTC"

Remainder of birds I will only plot the sensor data:

210742 was an adult female. It initiated on 8 May and left the colony between 5 and 7 June GSM was shed 10 June.

All 3 sensor axis for hen 210742

Movements of non-breeding hen 210742

Another quick look at 210746 with full dataset.

## [1] "adult"

## [1] NA

## [1] "2021-06-06 14:38:09 UTC"

All 3 sensor axis for hen 210742

210747 was a 2year female with a 24.9 mm bursa. It appeared to initiate on 10 May and the battery drained and the last GPS location was recieved on 31 May but we continued to get sensor data until 10 June. Hatch may have started during the 3rd and left the nest on the 5th.

## [1] "2year"

## [1] 24.9

## [1] "2021-06-10 09:15:12 UTC"

All 3 sensor axis for hen 210747

Movements of non-breeding hen 210747

210753 was an 2year female with a 15mm bursa. It did not breed and the tag fell off on 23 May.

## [1] "2year"

## [1] 15

## [1] "2021-05-23 02:50:39 UTC"

All 3 sensor axis for hen 210753

210754 was an 2year female with a 16.3mm bursa. It settled on the colony for a few hours on the 7th and returned and appeared to initiate on 8 May and the GSM was shed prematurly aroun 12 May. The tag may have been shed on the colony.

## [1] "2year"

## [1] 16.3

## [1] "2021-05-12 08:08:35 UTC"

All 3 sensor axis for hen 210754

Movements of non-breeding hen 210754

210756 was an 2year female with a 12 mm bursa. It did not breed. The GSM shed on 20 May and continued to transmit until 29 June.

## [1] "2year"

## [1] 12

## [1] "2021-06-29 10:20:49 UTC"

All 3 sensor axis for hen 210756

210745 was an 2year female with a 14.2 mm bursa. It appeared to initiate on 8 May and departed the colony on 12 June. The tag was lost on 13 July.

## [1] "2year"

## [1] 14.2

## [1] "2021-07-13 23:25:01 UTC"

All 3 sensor axis for hen 210754

212048 was an 3year female with a 5 mm bursa. It did not initiate and the GSM was shed on 22 May.

## [1] "3year"

## [1] 5

## [1] "2021-05-22 03:20:36 UTC"

All 3 sensor axis for hen 210754

210762 was an adult female with a 0 mm bursa. It did not initiate and the GSM was loston 15 May.

## [1] "adult"

## [1] NA

## [1] "2021-05-15 13:31:40 UTC"

All 3 sensor axis for hen 210754

210757 was an adult female with a 0 mm bursa. It initiated on 7 June and departed the colony on 3 July. the GSM was lost on 10 July.

## [1] "adult"

## [1] NA

## [1] "2021-07-10 06:32:53 UTC"

All 3 sensor axis for hen 210754

Movements of non-breeding hen 210754

212044 was an adult female with a 0 mm bursa. I’m certin idt did not breed there were issues with the data and are hard to interperate.

## [1] "adult"

## [1] 0

## [1] "2021-08-07 19:00:19 UTC"

## [1] "2021-06-24"

All 3 sensor axis for hen 210754

Movements of non-breeding hen 210754

210751 was an 2year female with a 12 mm bursa. It did not initiate and the GSM was shed prematurly on 9 May and continued to transmit until terminated

## [1] "2year"

## [1] 12

All 3 sensor axis for hen 210754

210748 was an adult female with a 0 mm bursa. It did not initiate and the GSM fell off on 7 June and continued to transmit.

## [1] "adult"

## [1] NA

All 3 sensor axis for hen 210754

210744 was an 2year female with a 15.3 mm bursa. It initiated on 10 May and the GSM was shed prematurly on 21 May.

## [1] "2year"

## [1] 15.3

## [1] "2021-05-20 23:33:38 UTC"

All 3 sensor axis for hen 210754

Movements of non-breeding hen 210754

210761 was an 2year female with a 14.1 mm bursa. It may have prospected on 2 islands: One before 20 May, and another on 21 May where it may have initiated on 22 May. initiated on 22 May and the GSM was shed on 9 July.

## [1] "2year"

## [1] 14.1

## [1] "2021-07-09 10:56:59 UTC"

All 3 sensor axis for hen 210754

Movements of non-breeding hen 210754

210759 was an adult female with a 0 mm bursa. It did not initiate and the GSM was shed on 24 May.

## [1] "adult"

## [1] NA

## [1] "2021-05-23 22:30:02 UTC"

All 3 sensor axis for hen 210754

212063 was an adult female with a 0 mm bursa. It did not initiate and the GSM was shed prematuraly on 20 May.

## [1] "adult"

## [1] 0

## [1] "2021-05-20 02:06:11 UTC"

All 3 sensor axis for hen 210754

210758 was an 2year female with a 12.5 mm bursa. It initiated on 11 May and left the colony on 6 June The GSm fell off on 1 July. Need to look at this bird in more detail.

## [1] "2year"

## [1] 12.5

## [1] "2021-07-01 00:40:58 UTC"

All 3 sensor axis for hen 210758

Movements of non-breeding hen 210758

210750 was an 2year female with a 8 mm bursa. It did not initiate and the GSM was shed 8 July.

## [1] "3year"

## [1] 8

## [1] "2021-07-08 03:03:59 UTC"

All 3 sensor axis for hen 210750

Movements of non-breeding hen 210754

210755 was an adult female with a 0 mm bursa. It initiated on 7 May and became active on 16 and leaving the colony on left 17 May then lost the GSM on 18 May.

## [1] "adult"

## [1] NA

## [1] "2021-05-18 13:46:16 UTC"

All 3 sensor axis for hen 210755

Movements of non-breeding hen 210755

210749 was an 2year female with a 16.2 mm bursa. It initiated on 8 May and the GSM was shed prematuraly on the island on 20 May.

## [1] "2year"

## [1] 16.2

## [1] "2021-09-01 12:17:08 UTC"

All 3 sensor axis for hen 210749

Movements of non-breeding hen 210749

210743 was an adult female with a 0 mm bursa. It looks like it intitated around 4 June, activity increased on 27 June but was still on the colony. Tag was lost on the colony on 1 July

## [1] "adult"

## [1] NA

## [1] "2021-07-01 02:20:18 UTC"

All 3 sensor axis for hen 210743

Movements of non-breeding hen 210743

210760 was an 2year female with a 12.7 mm bursa. The GSM was shed prematuraly on 30 April.

## [1] "2year"

## [1] 12.7

## [1] "2021-05-18 02:47:20 UTC"

All 3 sensor axis for hen 210754

Atlantic Eider GSM Accelator Data

S. Gilliland

Sensor Data

Results for a Couple of Birds.

Remainder of birds I will only plot the sensor data: