Breeding dynamics of a gentoo penguin Pygoscelis papua population at cierva point, Antarctic Peninsula

Aspects of the breeding biology of the Gentoo Penguin Pygoscelis papua were studied at Cierva Point, Antarctic Peninsula (64°09'S, 60°57'W). From a breeding population of 1044 pairs (85% with two eggs), 83% raised at least one chick to fledging. Survival in different subcolonies was neithe...

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Detalles Bibliográficos
Autores principales: Quintana, R.D., Cirelli, V.
Formato: JOUR
Materias:
population dynamics
reproductive biology
seabird
Antarctica
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10183337_v28_n1_p29_Quintana
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_10183337_v28_n1_p29_Quintana
record_format dspace
spelling todo:paper_10183337_v28_n1_p29_Quintana2023-10-03T15:56:27Z Breeding dynamics of a gentoo penguin Pygoscelis papua population at cierva point, Antarctic Peninsula Quintana, R.D. Cirelli, V. population dynamics reproductive biology seabird Antarctica Aspects of the breeding biology of the Gentoo Penguin Pygoscelis papua were studied at Cierva Point, Antarctic Peninsula (64°09'S, 60°57'W). From a breeding population of 1044 pairs (85% with two eggs), 83% raised at least one chick to fledging. Survival in different subcolonies was neither correlated with perimeter-area ratio nor with distance to the sea. Chick mortality at the end of January 1993 was 23.9%, whereas for the 1991/92 breeding season it was 14.0%; for 1993/94, 23.9%; for 1994/95, 33.0% and for 1995/96 24.3%. By 17 February 1993, chick mortality was 32.3%. Chick survival was regressed against time for nine selected subcolonies, showing a high correlation between them. Covariance analysis among the regression line slopes showed a non-significant result (F = 0.42, P > 0.05). No significant differences were also observed when Tuckey's multiple contrasts test was performed on the proportions of surviving chicks in-between weeks (P > 0.05), showing a gradual mortality of chicks from egg-laying to créching. These results show that the Gentoo Penguin colony at Cierva Point contains a higher proportion of pairs rearing two chicks and a lower mortality rate than does the species at other maritime Antarctic sites. Average annual growth of the colony increased by 5.7% from 1991 to 1996, in contrast to the period 1954-1958 when the colony decreased by -2.3%. The low impact of the Argentinean station near the study area could account for this fact. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10183337_v28_n1_p29_Quintana
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic population dynamics
reproductive biology
seabird
Antarctica
spellingShingle population dynamics
reproductive biology
seabird
Antarctica
Quintana, R.D.
Cirelli, V.
Breeding dynamics of a gentoo penguin Pygoscelis papua population at cierva point, Antarctic Peninsula
topic_facet population dynamics
reproductive biology
seabird
Antarctica
description Aspects of the breeding biology of the Gentoo Penguin Pygoscelis papua were studied at Cierva Point, Antarctic Peninsula (64°09'S, 60°57'W). From a breeding population of 1044 pairs (85% with two eggs), 83% raised at least one chick to fledging. Survival in different subcolonies was neither correlated with perimeter-area ratio nor with distance to the sea. Chick mortality at the end of January 1993 was 23.9%, whereas for the 1991/92 breeding season it was 14.0%; for 1993/94, 23.9%; for 1994/95, 33.0% and for 1995/96 24.3%. By 17 February 1993, chick mortality was 32.3%. Chick survival was regressed against time for nine selected subcolonies, showing a high correlation between them. Covariance analysis among the regression line slopes showed a non-significant result (F = 0.42, P > 0.05). No significant differences were also observed when Tuckey's multiple contrasts test was performed on the proportions of surviving chicks in-between weeks (P > 0.05), showing a gradual mortality of chicks from egg-laying to créching. These results show that the Gentoo Penguin colony at Cierva Point contains a higher proportion of pairs rearing two chicks and a lower mortality rate than does the species at other maritime Antarctic sites. Average annual growth of the colony increased by 5.7% from 1991 to 1996, in contrast to the period 1954-1958 when the colony decreased by -2.3%. The low impact of the Argentinean station near the study area could account for this fact.
format JOUR
author Quintana, R.D.
Cirelli, V.
author_facet Quintana, R.D.
Cirelli, V.
author_sort Quintana, R.D.
title Breeding dynamics of a gentoo penguin Pygoscelis papua population at cierva point, Antarctic Peninsula
title_short Breeding dynamics of a gentoo penguin Pygoscelis papua population at cierva point, Antarctic Peninsula
title_full Breeding dynamics of a gentoo penguin Pygoscelis papua population at cierva point, Antarctic Peninsula
title_fullStr Breeding dynamics of a gentoo penguin Pygoscelis papua population at cierva point, Antarctic Peninsula
title_full_unstemmed Breeding dynamics of a gentoo penguin Pygoscelis papua population at cierva point, Antarctic Peninsula
title_sort breeding dynamics of a gentoo penguin pygoscelis papua population at cierva point, antarctic peninsula
url http://hdl.handle.net/20.500.12110/paper_10183337_v28_n1_p29_Quintana
work_keys_str_mv AT quintanard breedingdynamicsofagentoopenguinpygoscelispapuapopulationatciervapointantarcticpeninsula
AT cirelliv breedingdynamicsofagentoopenguinpygoscelispapuapopulationatciervapointantarcticpeninsula
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