NDLI: A method to assess population changes in king penguins: the use of a Geographical Information System to estimate area-population relationships

Content Provider	Springer Nature Link
Author	Chamaillé Jammes, Simon Guinet, Christophe Nicoleau, Frédéric Argentier, Marie
Copyright Year	2000
Abstract	During the last decades, king penguin (Aptenodytes patagonicus) populations have been reported to increase throughout most of their breeding range. In this study, we compared the results obtained from direct counts of incubating king penguins with the results yielded by the estimation of the change in area occupied by breeding birds at the Ratmanoff king penguin colony at the Kerguelen Islands. The area of the colony was determined using a Geographical Information System with a georeferencing extension on aerial pictures taken in 1963, 1985 and 1998. Individual king penguin were counted on the same pictures or pictures taken on the same day. The overall population increase between 1963 and 1998 was 733% while the colony area increased by 677%. This study indicates that monitoring change in colony size is a good indicator for detecting and monitoring large population changes in king penguins, in particular for remote colonies. The discrepancy between the two results may be from two different kinds of bias. Firstly, there could be a possible error in the estimation of the area occupied by the colony resulting from the georeferencing of oblique pictures, and secondly, the density of king penguins may also change with population number. This method, which only requires high-altitude pictures, also reduces the possible disturbance to breeding made by low- to medium-altitude flights.
Starting Page	545
Ending Page	549
Page Count	5
File Format	PDF
ISSN	07224060
Journal	Polar Biology
Volume Number	23
Issue Number	8
e-ISSN	14322056
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-07-21
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Agricultural and Biological Sciences

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