Évolution annuelle des effectifs et des biomasses des oiseaux antarctiques
An estimation is made of the population numbers of the Antarctic and sub-Antarctic birds, their biomasses and their food consumption at sea, and of their seasonal variations The total populations of the 16 species represent a grand total of about 350 million birds and a biomass of ca 850,000 tons. F...
Main Authors: | , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | French |
Published: |
Société nationale de protection de la nature et d'acclimatation de France, Paris (FRA)
1980
|
Subjects: | |
Online Access: | http://hdl.handle.net/2042/54995 |
id |
ftjirevues:oai:documents.irevues.inist.fr:2042/54995 |
---|---|
record_format |
openpolar |
spelling |
ftjirevues:oai:documents.irevues.inist.fr:2042/54995 2023-05-15T13:51:06+02:00 Évolution annuelle des effectifs et des biomasses des oiseaux antarctiques MOUGIN, J.-L. PRÉVOST, J. 1980 http://hdl.handle.net/2042/54995 fr fre Société nationale de protection de la nature et d'acclimatation de France, Paris (FRA) Revue d'écologie J.-L. MOUGIN, J. PRÉVOST Évolution annuelle des effectifs et des biomasses des oiseaux antarctiques Revue d'écologie, 1980, vol. 34, N°1, pp. 101-134 2429-6422 http://hdl.handle.net/2042/54995 Accès libre avec barrière mobile de 6 mois - Licence d'utilisation : http://irevues.inist.fr/utilisation Revue d'écologie [ISSN 0249-7395], 1980, vol. 34, N°1, pp. 101-134 Article 1980 ftjirevues 2022-03-27T06:44:05Z An estimation is made of the population numbers of the Antarctic and sub-Antarctic birds, their biomasses and their food consumption at sea, and of their seasonal variations The total populations of the 16 species represent a grand total of about 350 million birds and a biomass of ca 850,000 tons. Forty nine percent of this population and 36 % of this biomass are found in the sub-Antarctic zone, as against 51 % and 64 % respectively in the Antarctic zone. The penguins represent 52 % of the total bird population and 92 % of the total bird biomass. Some seasonal variations occur, the difference between maximum and minimum values not exceeding 20 % however. On the average, 80 % of the birds live offshore, as against 20 % on land. The daily energy requirements are estimated to be of c 112 x 109 kcal, and the daily energy demands of c 160 x 109 kcal. The monthly food consomp tion at sea is about 4.7 million tons, 61 % of which are crustaceans, 24 % squids and 14 % fish. Penguins are the major consumers. The amount of food consumed does not vary much from month to month, them onthly maximum being only 70 % higher than the monthly minimum in the Antartic zone, and 56 % in the sub-Antarctic zone. Some hypotheses are formulated concerning competition for food between birds, seals and whales. There was probably no competition when whales were numerous in Southern Oceans, feeding on the huge summer planctonic production, little being left for birds and seals. The present situation is quite different, most of the summer production of plancton no longer being used on a large scale by mammals and birds Article in Journal/Newspaper Antarc* Antarctic Antarctique* antartic* I-Revues (E-Journals, INIST-CNRS) Antarctic The Antarctic |
institution |
Open Polar |
collection |
I-Revues (E-Journals, INIST-CNRS) |
op_collection_id |
ftjirevues |
language |
French |
description |
An estimation is made of the population numbers of the Antarctic and sub-Antarctic birds, their biomasses and their food consumption at sea, and of their seasonal variations The total populations of the 16 species represent a grand total of about 350 million birds and a biomass of ca 850,000 tons. Forty nine percent of this population and 36 % of this biomass are found in the sub-Antarctic zone, as against 51 % and 64 % respectively in the Antarctic zone. The penguins represent 52 % of the total bird population and 92 % of the total bird biomass. Some seasonal variations occur, the difference between maximum and minimum values not exceeding 20 % however. On the average, 80 % of the birds live offshore, as against 20 % on land. The daily energy requirements are estimated to be of c 112 x 109 kcal, and the daily energy demands of c 160 x 109 kcal. The monthly food consomp tion at sea is about 4.7 million tons, 61 % of which are crustaceans, 24 % squids and 14 % fish. Penguins are the major consumers. The amount of food consumed does not vary much from month to month, them onthly maximum being only 70 % higher than the monthly minimum in the Antartic zone, and 56 % in the sub-Antarctic zone. Some hypotheses are formulated concerning competition for food between birds, seals and whales. There was probably no competition when whales were numerous in Southern Oceans, feeding on the huge summer planctonic production, little being left for birds and seals. The present situation is quite different, most of the summer production of plancton no longer being used on a large scale by mammals and birds |
format |
Article in Journal/Newspaper |
author |
MOUGIN, J.-L. PRÉVOST, J. |
spellingShingle |
MOUGIN, J.-L. PRÉVOST, J. Évolution annuelle des effectifs et des biomasses des oiseaux antarctiques |
author_facet |
MOUGIN, J.-L. PRÉVOST, J. |
author_sort |
MOUGIN, J.-L. |
title |
Évolution annuelle des effectifs et des biomasses des oiseaux antarctiques |
title_short |
Évolution annuelle des effectifs et des biomasses des oiseaux antarctiques |
title_full |
Évolution annuelle des effectifs et des biomasses des oiseaux antarctiques |
title_fullStr |
Évolution annuelle des effectifs et des biomasses des oiseaux antarctiques |
title_full_unstemmed |
Évolution annuelle des effectifs et des biomasses des oiseaux antarctiques |
title_sort |
évolution annuelle des effectifs et des biomasses des oiseaux antarctiques |
publisher |
Société nationale de protection de la nature et d'acclimatation de France, Paris (FRA) |
publishDate |
1980 |
url |
http://hdl.handle.net/2042/54995 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctique* antartic* |
genre_facet |
Antarc* Antarctic Antarctique* antartic* |
op_source |
Revue d'écologie [ISSN 0249-7395], 1980, vol. 34, N°1, pp. 101-134 |
op_relation |
Revue d'écologie J.-L. MOUGIN, J. PRÉVOST Évolution annuelle des effectifs et des biomasses des oiseaux antarctiques Revue d'écologie, 1980, vol. 34, N°1, pp. 101-134 2429-6422 http://hdl.handle.net/2042/54995 |
op_rights |
Accès libre avec barrière mobile de 6 mois - Licence d'utilisation : http://irevues.inist.fr/utilisation |
_version_ |
1766254703183659008 |