Mate and Nest Site Fidelity in a Resident Population of Bald Eagles

Jenkins, Julianna M. A.; Jackman, Ronald E.

doi:10.2307/1369447

Cited by 34 publications

(20 citation statements)

References 9 publications

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“…As most raptor species are found nesting in the same places year after year, it has often been assumed that individual adults are faithful both to their nesting territories and to their mates in successive years; studies with marked birds are rare however (Newton 1979;Jenkins and Jackman 1993;Forero et al 1999;Wink et al 1999;McDonald et al 2003). It is known that Lesser Spotted Eagle breeding sites are often occupied for decades.…”

Section: Site Attachment and Resettlementmentioning

confidence: 99%

Why do female Lesser Spotted Eagles (Aquila pomarina) visit strange nests remote from their own?

Meyburg¹,

Meyburg²,

Franck-Neumann³

2007

J Ornithol

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There is very little confirmed information on the social organisation of breeding Lesser Spotted Eagle populations, the turnover rate of adults, and their nest-site and partner fidelity. According to established knowledge, however, breeding individuals are territorial and defend at least the immediate vicinity of the nest site against their own species. It has further been thought that females rearing young, as with the females of other raptor species, remain within a radius of only a few kilometres of their eyrie. Using GPS satellite telemetry and DNA microsatellite analysis (DNA STR typing), we were able to disprove this prevailing hypothesis. A satellite-tracked female flew over 50 km away from her eyrie (D) in at least two different directions and visited at least one other occupied eyrie (T). It was also established that at least two strange females arrived at her eyrie, which contained young, from as far away as 57 km, and probably remained there for some considerable time. The pool of alleles represented at the different loci analysed, as well as the distribution of these alleles among the individuals, excludes the possibility that these females could be sisters or even half-sisters. Visits of strange eagles at this eyrie were also confirmed by direct observation. It can therefore be assumed that males only exhibit territorial behaviour towards their own sex and not towards strange females and that females do not exhibit territorial behaviour towards other females; but all these assumptions must be confirmed by further studies. For the first time it could be proved by means of microsatellite analysis that almost all females studied used the same breeding site for 2 consecutive years. The longest established period in which both partners of a pair remained at the same breeding site was 3 consecutive years.

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Section: Site Attachment and Resettlementmentioning

confidence: 99%

Why do female Lesser Spotted Eagles (Aquila pomarina) visit strange nests remote from their own?

Meyburg¹,

Meyburg²,

Franck-Neumann³

2007

J Ornithol

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“…To our knowledge, nest site fidelity has been little studied in golden eagles and is presumed to be similar to that in bald eagles where pairs consistently return to traditional sites (Jenkins and Jackman 1993);however, Marzluff et uZ. (1993) found at least one case of an adult female attempting to breed in an adjacent territory.…”

Section: Golden Eagle Population Project 23mentioning

confidence: 99%

A pilot golden eagle population study in the Altamont Pass Wind Resource Area, California

Hunt

1995

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NREL/TP-44 1 -7821 UC Category: 1 2 1 0 DE95009220This pilblici~Iioll wus reproduced from the best iivaili\ble camera-ready copy submilled by the subcontractor and received no editorial review at NREL. NOTICEThis report was prepared as an account of work sponsored by an agency of the United States government.Neither the United States government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States government or any agency thereof GOLDEN EAGLE POPULATION PROJECT i EXECUTIVE SUMMARYDuring 1994, the Predatory Bird Research Group, University of California, Santa Cruz, conducted a preliminary field investigation of the ecology of golden eagles (Aquila chrymem) in the vicinity of the Altamont Pass Wind Resource Area (WRA). The facility contains about 6,500 wind turbines on 189 km2 just east of San Francisco Bay in California. Grassland and oak savanna habitats surrounding the WRA support a substantial population of golden eagles. Each year, the U.S. Fish and Wildlife Service receives reports from the wind industry of about 30 golden eagle casualties occurring at the WRA, with over 90 percent attributed to collisions with wind turbines. The purpose of this pilot study was to clarify and set in motion a research program that will identify (1) the effect of turbine-related mortality on the golden eagle population, (2) factors attracting eagles to the WRA, and (3) conditions that increase the risk of turbine strikes.To show the distribution of the population potentially impacted and to obtain survival data, we radio-tagged 31 adult and subadult eagles in the WRA vicinity during January and February 1994 and an additional 25 juveniles from nests surrounding the WRA in spring. Each transmitter contained a mortality sensor and was expected to last five years. Throughout 1994, we determined the location and status of each eagle in twice-weekly airplane roll-call surveys.Of the 31 winter-tagged eagles, 5 were members of pairs breeding near the WRA. Of the remaining 26 birds, 19 were subadults and seven were non-breeding adults (floaters). Over the course of the year, four (15 %) of the 26 non-breeders either departed the region or their radios failed. The remainder traveled within the northern Diablo Range which extends from the Qakland Hills southeast to San Luis Reservoir, an area of about 3,500 km2, for which we developed a digitized (GIS) vegetation map from satellite photographs. Our findings suggest that at least three-quarters of the golden eagles frequenting the WRA vicinity in winter are yearround residents of the Diablo Range.T...

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“…Geological Survey 2010a) and exhibit strong nest-site and mate fidelity (Jenkins and Jackman 1993). Once breeding areas have been located, size, reproductive parameters, and nest-site characteristics of breeding populations can be determined with surveys that use established techniques and terminology (Postupalsky 1974(Postupalsky , 1983Steenhof 1987).…”

Section: Introductionmentioning

confidence: 99%