Abstract:
Between September to December 2016, Global Positioning System (GPS Pathtrack) data loggers were attached to breeding northern rockhopper penguins during the three distinct stages of the nest-attendance part of their breeding cycle; incubation, brood-guard and creche, on Nightingale (37 deg 25'S, 12 deg 28'W; 4 km2) and Inaccessible (37 deg 17'S, 12 deg 40'W; 14 km2) Islands.
This tracking data successfully augments and complements existing data sets for the species breeding in the South Atlantic, which enables systematic identification of areas of particular relevance for this species, and thus to help determining whether there is a need to improve marine spatial planning in form of e.g. Marine Protected Areas in the island's Exclusive Economic Zone (EEZ).
Data were collected as part of the Darwin Plus funded Project Pinnamin (grant DPLUS 053), 2016 - 2018.
Keywords:
Endangered, Eudyptes moseleyi, Foraging , Northern rockhopper penguin, Tristan da Cunha
| Access Constraints: | This data is under embargo. |
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| Use Constraints: | This data is governed by the NERC data policy http://www.nerc.ac.uk/research/sites/data/policy/ and supplied under Open Government Licence v.3 http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ |
| Creation Date: | 2018-10-29 |
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| Dataset Progress: | Complete |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | UK PDC |
| Role(s) | Metadata Author |
| Organisation | British Antarctic Survey |
| Name | Dr Antje Steinfurth |
| Role(s) | Investigator |
| Organisation | Royal Society for the Protection of Birds |
| Name | Dr Norman Ratcliffe |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Name | Dr Alex Bond |
| Role(s) | Investigator |
| Organisation | Royal Society for the Protection of Birds |
| Parent Dataset: | N/A |
| Reference: | Antje Steinfurth, Richard B. Sherley, Rukaya Johaadien, Richard J. Cuthbert, Trevor Glass, Norman Ratcliffe, Peter G. Ryan (in prep) The effect of latitude and colony size on the breeding biology of the most northerly Eudyptes penguin. Ibis Antje Steinfurth, Maria Dias, Steffen Oppel, Ben J Dilley, Delia Davies, Mara Nydegger, Chris Bell, Richard J Cuthbert, Trevor Glass, Azwianewi Makhado, Robert J M Crawford, Peter G Ryan, Ross Wanless, Alexander L Bond, Norman Ratcliffe (in prep) Important marine areas for northern rockhopper penguins in the South Atlantic. Marine Policy |
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| Lineage/Methodology: | GPS tags were deployed from Inaccessible Island during brood-guard and from Nightingale Island during incubation, creche and brood-guard. Tags were attached to animals' feathers on the dorsal mid-line of the bird's lower back using overlapping layers of black waterproof tape and cyanoacrylate glue. Some GPS tags were deployed in combination with TDR devices. Birds were captured by hand or using a hand-held net at their nest site (when incubating or in brood-guard) or in the colony when feeding chicks (when in creche). To reduce stress, only one bird per nest was tagged, with different birds captured during each breeding stage. Handling time was restricted to 15 minutes and birds were stained with temporary animal marker to allow them to be identified for recapture to retrieve loggers. Loggers were programmed to sample positions every 0.75-3 minutes during brood-guard and creche. During incubation, various sampling rates were used as foraging trips were expected to last up to 3 weeks, and there were concerns about the batteries lasting for the entire trip. These ranged from 1 position every 10 minutes to every 5 minutes for 2 hours per day (between 00:00-01:00 h and 12:00-13:00 h). More information on sampling rates is in included in the pdf file 'Logger_settings.pdf'. All devices only recorded positions when the bird was at the water surface. On Nightingale, equipped birds were recaptured when seen returning from the sea or at return to the nest. At Inaccessible Island, the tags downloaded data to the base station via a wireless UHF radio link, eliminating the need for tag retrieval. |
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| Temporal Coverage: | |
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| Start Date | 2016-09-09 |
| End Date | 2016-11-06 |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -41 |
| Northernmost | -34 |
| Longitude | |
| Westernmost | -17 |
| Easternmost | -5 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Location: | |
| Location | South Atlantic Ocean |
| Detailed Location | Nightingale Island, Tristan da Cunha |
| Sensor(s): |
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| Data Collection: | GPS logger models used: Pathtrack nanoFix GEO on Nightingale, and Pathtrack nanoFix GEO+RT on Inaccessible (PathTrack, 54 x 19 x 15 mm, 24 g). Data were downloaded and analysed using R (version 3.4.0, R Development Core Team). Erroneous GPS locations were filtered by the speedfilter function (trip package, Sumner 2015) when speed exceeded 8km/h and duplicate positions removed. When devices recorded consecutive trips, data were separated into foraging trips, which were described by last and first recorded position back at the colony using QGIS (QGIS Development Team). To compensate for irregular gaps between positional fixes within the tracks, filtered data were subsequently processed using a continuous, time-correlated random walk model (crawl package, Johnson et al. 2008). Based on the simulation of 100 possible tracks the most likely or 'best fit'' path used by the penguin is generated. |
| Data Storage: | There are two data types for each penguin a) the unprocessed raw and b) the processed GPS data. All files are in the CSV format, with a total volume of 20.2 MB. |
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