Population dynamics of Antarctophthirus microchir (Anoplura: Echinophthiriidae) in pups fromSouth American sea lion, Otaria flavescens, in Northern Patagonia
We analysed population dynamics of the louse Antarctophthirus microchir in pups of the South American sea lion, Otaria flavescens, at the Punta León rookery (Argentina) over a period of 2 years. A total of 136 pups were aged and marked at the beginning of the lactation period ashore, then sampled f...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.468.16 2023-05-15T14:05:25+02:00 Population dynamics of Antarctophthirus microchir (Anoplura: Echinophthiriidae) in pups fromSouth American sea lion, Otaria flavescens, in Northern Patagonia F. J. Aznar M. S. Leonardi B. Berón Vera D. G. Vales S. Ameghino J. A. Raga E. A. Crespo The Pennsylvania State University CiteSeerX Archives 2009 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.468.16 http://phthiraptera.info/Publications/47451.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.468.16 http://phthiraptera.info/Publications/47451.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://phthiraptera.info/Publications/47451.pdf Key words Anoplura Echinophthiriidae life cycle trade-off South American sea lion text 2009 ftciteseerx 2016-01-08T07:03:23Z We analysed population dynamics of the louse Antarctophthirus microchir in pups of the South American sea lion, Otaria flavescens, at the Punta León rookery (Argentina) over a period of 2 years. A total of 136 pups were aged and marked at the beginning of the lactation period ashore, then sampled for lice at different times within 30 days. Sampling was restricted to the chest and belly, two sites where lice were especially abundant. This concentration on ventral areas might protect lice from thermal stress in the austral summer. Infestation patterns in pups f3 days old suggested that the potential for transmission increased from first nymphs to adults. Population trends of each instar with pup age, based on standardised values of abundance, were conserved between years, reflecting the basic dynamics of recruitment and reproduction. However, trends based on log-transformed abundances varied significantly between years; apparently, environmental conditions affected growth of lice populations differently each year. Stage-based deterministic models for population growth of A. microchir suggested generation times from 18 to 23 days. Accordingly, only 2 lice generations might be produced before pups start going to the sea. Shortening the cycle to accommodate a third generation might be risky, whereas a 2-generation cycle might at least result in larger females producing higher numbers of viable offspring. Text Antarc* Unknown Argentina Austral Patagonia The Louse ENVELOPE(-56.415,-56.415,51.700,51.700) |
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English |
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Key words Anoplura Echinophthiriidae life cycle trade-off South American sea lion |
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Key words Anoplura Echinophthiriidae life cycle trade-off South American sea lion F. J. Aznar M. S. Leonardi B. Berón Vera D. G. Vales S. Ameghino J. A. Raga E. A. Crespo Population dynamics of Antarctophthirus microchir (Anoplura: Echinophthiriidae) in pups fromSouth American sea lion, Otaria flavescens, in Northern Patagonia |
topic_facet |
Key words Anoplura Echinophthiriidae life cycle trade-off South American sea lion |
description |
We analysed population dynamics of the louse Antarctophthirus microchir in pups of the South American sea lion, Otaria flavescens, at the Punta León rookery (Argentina) over a period of 2 years. A total of 136 pups were aged and marked at the beginning of the lactation period ashore, then sampled for lice at different times within 30 days. Sampling was restricted to the chest and belly, two sites where lice were especially abundant. This concentration on ventral areas might protect lice from thermal stress in the austral summer. Infestation patterns in pups f3 days old suggested that the potential for transmission increased from first nymphs to adults. Population trends of each instar with pup age, based on standardised values of abundance, were conserved between years, reflecting the basic dynamics of recruitment and reproduction. However, trends based on log-transformed abundances varied significantly between years; apparently, environmental conditions affected growth of lice populations differently each year. Stage-based deterministic models for population growth of A. microchir suggested generation times from 18 to 23 days. Accordingly, only 2 lice generations might be produced before pups start going to the sea. Shortening the cycle to accommodate a third generation might be risky, whereas a 2-generation cycle might at least result in larger females producing higher numbers of viable offspring. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
F. J. Aznar M. S. Leonardi B. Berón Vera D. G. Vales S. Ameghino J. A. Raga E. A. Crespo |
author_facet |
F. J. Aznar M. S. Leonardi B. Berón Vera D. G. Vales S. Ameghino J. A. Raga E. A. Crespo |
author_sort |
F. J. Aznar |
title |
Population dynamics of Antarctophthirus microchir (Anoplura: Echinophthiriidae) in pups fromSouth American sea lion, Otaria flavescens, in Northern Patagonia |
title_short |
Population dynamics of Antarctophthirus microchir (Anoplura: Echinophthiriidae) in pups fromSouth American sea lion, Otaria flavescens, in Northern Patagonia |
title_full |
Population dynamics of Antarctophthirus microchir (Anoplura: Echinophthiriidae) in pups fromSouth American sea lion, Otaria flavescens, in Northern Patagonia |
title_fullStr |
Population dynamics of Antarctophthirus microchir (Anoplura: Echinophthiriidae) in pups fromSouth American sea lion, Otaria flavescens, in Northern Patagonia |
title_full_unstemmed |
Population dynamics of Antarctophthirus microchir (Anoplura: Echinophthiriidae) in pups fromSouth American sea lion, Otaria flavescens, in Northern Patagonia |
title_sort |
population dynamics of antarctophthirus microchir (anoplura: echinophthiriidae) in pups fromsouth american sea lion, otaria flavescens, in northern patagonia |
publishDate |
2009 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.468.16 http://phthiraptera.info/Publications/47451.pdf |
long_lat |
ENVELOPE(-56.415,-56.415,51.700,51.700) |
geographic |
Argentina Austral Patagonia The Louse |
geographic_facet |
Argentina Austral Patagonia The Louse |
genre |
Antarc* |
genre_facet |
Antarc* |
op_source |
http://phthiraptera.info/Publications/47451.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.468.16 http://phthiraptera.info/Publications/47451.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766277320688009216 |