Abstract:
100 nests in designated Adelie and Chinstrap penguin colonies are marked and then regularly monitored. Data are collected on when eggs are laid in each nest, when they hatch, when eggs or chicks are lost, and when chicks become unguarded. Data exist from 1996 onwards. For Adelie penguins, 100 nests in a colony designated A41 was monitored between 1996 and 2002, from 2003 onwards 100 nests in a colony designated A39 were monitored. For Chinstrap penguins, 100 nests in a colony designated A69 were monitored between 1996 and 2015, from 2016 onwards, 100 nests in a colony designated C66 were monitored. No data were collected in the 1997-98, 1999-2000 and 2010-2011 seasons.
To calculate the annual hatching date a binomial model was fitted using the proportion of nests containing one or more chicks as the response variable and the date in days after 1 Oct as the explanatory variable. This model was fitted for each species and year separately. The dose.p function in the MASS package in R was used to derive the day when 50% of nests contained one or more chicks to produce the mean hatching date for each species-year combination. Mean laying dates were back-calculated from the mean hatching dates by subtracting the average incubation periods for each species (35 days for Adelies and 36.4 days for chinstraps, which are relatively constant between years). This has been calculated for data from 1996 to 2016.
Keywords:
Adelie penguin, Chinstrap penguin, SignyIsland, breeding success, chronology
| Access Constraints: | Requests for data can be made via the Polar Data Centre (PDC) at BAS |
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| Use Constraints: | NERC-funded data supplied under OGL v.3: https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ |
| Creation Date: | 2008-09-03 |
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| Dataset Progress: | In Work |
| Dataset Language: | English |
| ISO Topic Categories: |
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| Parameters: |
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| Personnel: | |
| Name | Helen Peat |
| Role(s) | Metadata Author |
| Name | Mike Dunn |
| Role(s) | Investigator |
| Organisation | British Antarctic Survey |
| Parent Dataset: | N/A |
| Reference: | MASS package in R from: Ripley, B., Venables, B., Bates, D. M., Hornik, K., Gebhardt, A., and Firth, D. (2017). MASS: Functions and datasets to support Venables and Ripley,Modern Applied Statistics with S 4th edition, 2002. R package version 7.3-47. Retrieved from https://cran.r-project.org/web/packages/MASS/index.html | |
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| Ownership: | British Antarctic Survey, NERC; Cambridge; UK. | |
| Temporal Coverage: | |
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| Start Date | 1996-11-06 |
| End Date | N/A |
| Spatial Coverage: | |
| Latitude | |
| Southernmost | -60.71667 |
| Northernmost | -60.71667 |
| Longitude | |
| Westernmost | -45.63333 |
| Easternmost | -45.63333 |
| Altitude | |
| Min Altitude | N/A |
| Max Altitude | N/A |
| Depth | |
| Min Depth | N/A |
| Max Depth | N/A |
| Location: | |
| Location | South Orkney Islands |
| Detailed Location | Signy Island |
| Data Collection: | 100 Chinstrap penguin nests are marked in colony C66 (C69 was used prior to 2016) and 100 Adelie penguin nests in colony A39 (A41 was used prior to 2003). The nests are monitored every few days and the number of eggs, chicks, unguarded chicks in each nest is recorded. |
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