Socio-écologie du Skua antarctique a Pointe Géologie
International audience The breeding colony of Antarctic skuas Stercorarius mac- cormicki of Pointe Géologie, Adélie Land, has been studied since 1965. The number of birds present at the colony site increased from 80-90 in 1965/66 to 320 in 1976/77, and the number of breeding pairs from 29 to 40 duri...
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ftccsdartic:oai:HAL:hal-03530464v1 2023-08-15T12:38:54+02:00 Socio-écologie du Skua antarctique a Pointe Géologie Jouventin, Pierre Guillotin, Michel 1979 https://hal.science/hal-03530464 https://hal.science/hal-03530464/document https://hal.science/hal-03530464/file/bitstream_118216.pdf fr fre HAL CCSD Société nationale de protection de la nature (SNPN) hal-03530464 https://hal.science/hal-03530464 https://hal.science/hal-03530464/document https://hal.science/hal-03530464/file/bitstream_118216.pdf info:eu-repo/semantics/OpenAccess ISSN: 0249-7395 EISSN: 2429-6422 Revue d'Écologie https://hal.science/hal-03530464 Revue d'Écologie, 1979, 1, pp.109-127 [SDE.BE]Environmental Sciences/Biodiversity and Ecology info:eu-repo/semantics/article Journal articles 1979 ftccsdartic 2023-07-22T23:10:14Z International audience The breeding colony of Antarctic skuas Stercorarius mac- cormicki of Pointe Géologie, Adélie Land, has been studied since 1965. The number of birds present at the colony site increased from 80-90 in 1965/66 to 320 in 1976/77, and the number of breeding pairs from 29 to 40 during this period. In the same time interval, the average distance between nests was reduced from 110 to 65 m. The stability of the pair-bond is shown to be advantageous in Antarctic skuas. Breeding is higher in long-established pairs (Table I). The yearly production of eggs by the breeding birds increased from 44 in 1965/66 to 63 in 1976/77. However, the mortality rate of eggs increased in the same time period from 31 % to 48.6 %. The number of fledglings consequently remained more or less constant, ranging from 26 to 33 depending upon the year. This spectacular increase in the number of breeding pairs and in their fecundity apparently results from an artificial increase in the carrying capacity of the habitat. The establishment of a garbage dump close to the buildings of the French Antarctic base led to a progressive change in the food habits of the Antarctic skuas. Whereas these “ opportunistic ” birds originally preyed upon Adélie penguins’ eggs, chicks and carcases, they quickly began to feed exclusively upon human garbage. The use of this new permanent food source led to a rapid increase in the local population between 1970 and 1972. This population is now levelling off, having apparently reached a new equilibrium with the available resources. During the stage of exponential increase, most pairs successfully raised two chicks instead of one this is no longer the case now. The adaptation to a new food source has also changed the timing of the breeding season of the Antarctic skua. Instead of being closely synchronised with the breeding season of the sympa- tric Adélie penguins, the laying of Antarctic skua eggs now tends to be spread upon a much longer time period. Whereas the longest time interval between the ... Article in Journal/Newspaper Antarc* Antarctic Antarctic Skuas Antarctique* Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Pointe-Géologie ENVELOPE(140.017,140.017,-66.667,-66.667) The Antarctic |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
French |
topic |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology |
spellingShingle |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology Jouventin, Pierre Guillotin, Michel Socio-écologie du Skua antarctique a Pointe Géologie |
topic_facet |
[SDE.BE]Environmental Sciences/Biodiversity and Ecology |
description |
International audience The breeding colony of Antarctic skuas Stercorarius mac- cormicki of Pointe Géologie, Adélie Land, has been studied since 1965. The number of birds present at the colony site increased from 80-90 in 1965/66 to 320 in 1976/77, and the number of breeding pairs from 29 to 40 during this period. In the same time interval, the average distance between nests was reduced from 110 to 65 m. The stability of the pair-bond is shown to be advantageous in Antarctic skuas. Breeding is higher in long-established pairs (Table I). The yearly production of eggs by the breeding birds increased from 44 in 1965/66 to 63 in 1976/77. However, the mortality rate of eggs increased in the same time period from 31 % to 48.6 %. The number of fledglings consequently remained more or less constant, ranging from 26 to 33 depending upon the year. This spectacular increase in the number of breeding pairs and in their fecundity apparently results from an artificial increase in the carrying capacity of the habitat. The establishment of a garbage dump close to the buildings of the French Antarctic base led to a progressive change in the food habits of the Antarctic skuas. Whereas these “ opportunistic ” birds originally preyed upon Adélie penguins’ eggs, chicks and carcases, they quickly began to feed exclusively upon human garbage. The use of this new permanent food source led to a rapid increase in the local population between 1970 and 1972. This population is now levelling off, having apparently reached a new equilibrium with the available resources. During the stage of exponential increase, most pairs successfully raised two chicks instead of one this is no longer the case now. The adaptation to a new food source has also changed the timing of the breeding season of the Antarctic skua. Instead of being closely synchronised with the breeding season of the sympa- tric Adélie penguins, the laying of Antarctic skua eggs now tends to be spread upon a much longer time period. Whereas the longest time interval between the ... |
format |
Article in Journal/Newspaper |
author |
Jouventin, Pierre Guillotin, Michel |
author_facet |
Jouventin, Pierre Guillotin, Michel |
author_sort |
Jouventin, Pierre |
title |
Socio-écologie du Skua antarctique a Pointe Géologie |
title_short |
Socio-écologie du Skua antarctique a Pointe Géologie |
title_full |
Socio-écologie du Skua antarctique a Pointe Géologie |
title_fullStr |
Socio-écologie du Skua antarctique a Pointe Géologie |
title_full_unstemmed |
Socio-écologie du Skua antarctique a Pointe Géologie |
title_sort |
socio-écologie du skua antarctique a pointe géologie |
publisher |
HAL CCSD |
publishDate |
1979 |
url |
https://hal.science/hal-03530464 https://hal.science/hal-03530464/document https://hal.science/hal-03530464/file/bitstream_118216.pdf |
long_lat |
ENVELOPE(140.017,140.017,-66.667,-66.667) |
geographic |
Antarctic Pointe-Géologie The Antarctic |
geographic_facet |
Antarctic Pointe-Géologie The Antarctic |
genre |
Antarc* Antarctic Antarctic Skuas Antarctique* |
genre_facet |
Antarc* Antarctic Antarctic Skuas Antarctique* |
op_source |
ISSN: 0249-7395 EISSN: 2429-6422 Revue d'Écologie https://hal.science/hal-03530464 Revue d'Écologie, 1979, 1, pp.109-127 |
op_relation |
hal-03530464 https://hal.science/hal-03530464 https://hal.science/hal-03530464/document https://hal.science/hal-03530464/file/bitstream_118216.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1774300400770351104 |