Hahn, Steffen; Peter, Hans-Ulrich (2003): (Table 1) Reproductive performance of brown skua pairs with and without feeding territories at Potter Peninsula/King George Island from 1998/1999 to 2000/2001 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.848018, Supplement to: Hahn, S; Peter, H-U (2003): Feeding territoriality and the reproductive consequences in brown skuas Catharacta antarctica lonnbergi. Polar Biology, 26(8), 552-559, https://doi.org/10.1007/s00300-003-0522-z
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Abstract:
In the maritime Antarctic, brown skuas (Catharacta antarctica lonnbergi) show two foraging strategies: some pairs occupy feeding territories in penguin colonies, while others can only feed in unoccupied areas of a penguin colony without defending a feeding territory. One-third of the studied breeding skua population in the South Shetlands occupied territories of varying size (48 to >3,000 penguin nests) and monopolised 93% of all penguin nests in sub-colonies. Skuas without feeding territories foraged in only 7% of penguin sub-colonies and in part of the main colony. Females owning feeding territories were larger in body size than females without feeding territories; no differences in size were found in males. Territory holders permanently controlled their resources but defence power diminished towards the end of the reproductive season. Territory ownership guaranteed sufficient food supply and led to a 5.5 days earlier egg-laying and chick-hatching. Short distances between nest and foraging site allowed territorial pairs a higher nest-attendance rate such that their chicks survived better (71%) than chicks from skua pairs without feeding territories (45%). Due to lower hatching success in territorial pairs, no difference in breeding success of pairs with and without feeding territories was found in 3 years. We conclude that skuas owning feeding territories in penguin colonies benefit from the predictable and stable food resource by an earlier termination of the annual breeding cycle and higher offspring survivorship.
Project(s):
Funding:
German Research Foundation (DFG), grant/award no. 5472008: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
Coverage:
Latitude: -62.250000 * Longitude: -58.670000
Event(s):
Comment:
Please note: Catharacta antarctica lonnbergi is more officially called Stercorarius lonnbergi.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Time coverage | Coverage | Hahn, Steffen | |||
| 2 | Group | Group | Hahn, Steffen | territoriality | ||
| 3 | Sample amount | N | # | Hahn, Steffen | number of pairs | |
| 4 | Catharacta antarctica lonnbergi, clutch size | C. antarctica lonnbergi clutch s | # | Hahn, Steffen | ||
| 5 | Standard deviation | Std dev | ± | Hahn, Steffen | clutch size | |
| 6 | Eggs survived to hatching | Eggs survived hatch | % | Hahn, Steffen | hatched chicks per eggs laid | |
| 7 | Number of fledglings per nest | Fledglings | # | Hahn, Steffen | ||
| 8 | Standard deviation | Std dev | ± | Hahn, Steffen | fledglings/nest |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
48 data points
Data
| 1 Coverage | 2 Group (territoriality) | 3 N [#] (number of pairs) | 4 C. antarctica lonnbergi clutch s [#] | 5 Std dev [±] (clutch size) | 6 Eggs survived hatch [%] (hatched chicks per eggs laid) | 7 Fledglings [#] | 8 Std dev [±] (fledglings/nest) |
|---|---|---|---|---|---|---|---|
| 1998/1999 | with feeding territories | 10 | 2.00 | 0.47 | 70 | 0.90 | 0.88 |
| 1998/1999 | without feeding territories | 16 | 1.86 | 0.35 | 92 | 0.50 | 0.73 |
| 1999/2000 | with feeding territories | 9 | 2.00 | 0.00 | 88 | 1.13 | 0.84 |
| 1999/2000 | without feeding territories | 21 | 1.76 | 0.44 | 70 | 0.57 | 0.60 |
| 2000/2001 | with feeding territories | 9 | 1.75 | 0.46 | 57 | 0.67 | 0.87 |
| 2000/2001 | without feeding territories | 23 | 1.91 | 0.29 | 84 | 1.09 | 0.85 |