January 2009
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15 Reads
Ornithology
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Publications (34)
January 2009
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57 Reads
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1 Citation
Ornithology
October 2008
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4 Reads
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24 Citations
The Birds of North America Online
June 2008
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65 Reads
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39 Citations
Ibis
Intensive manipulations of rare birds can be important conservation tools when traditional management practices, such as legal protection and habitat preservation, are insufficient to halt population declines and save endangered species from extinction. Nonetheless, this “hands-on” methodology has been criticized as scientifically unsound, ineffective, costly and a diversion from preservation of habitats and ecosystems. We consider the effectiveness of manipulative management by reviewing 30 presentations at the Symposium on Management Techniques for Preserving Endangered Birds in 1977. Examination of the outcome of these efforts in 1993 indicates that 43% have contributed to improved population viability through an increase in breeding numbers, another 23% have helped to stabilize numbers or to slow the rate of population decline, while the outcome of five others (17%) is inconclusive, and the same number ended in failure. Our evaluation of these and other similar projects is that the hands-on approach has proved to be a justified and effective stopgap procedure to help critically endangered species through a crisis, to reintroduce species into previously occupied range and to reinforce locally diminished populations. As such, it often needs to be part of an integrated program for avian conservation.
June 2008
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2,675 Reads
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167 Citations
Ibis
By 1974, the Mauritius kestrel had declined to only four known wild birds, including one breeding pair, as a result of habitat loss and pesticide contamination. A conservation project begun in 1973 has used many management techniques including captive breeding, supplemental feeding of wild birds, provision of nestboxes, multiple clutching, egg pulling, artificial incubation, hand rearing and release of captive-bred and captive-reared birds by hacking, fostering and predator control. A total of 331 kestrels were released up to the end of the 1993-1994 breeding season; a third of these were captive bred, the rest were derived from eggs harvested from the wild. About 257 (78%) released birds survived to independence and 61% of independent juveniles survived their first winter. Although at least 71% of ringed birds attempted to breed in their first year, only 38% of the nests of first-year females successfully fledged young, averaging 1.7 per successful nest. Older females fledged young from 64% of nests, fledging an average of 2.0 per successful nest. Annual replacement of birds holding territories averaged 17% for both sexes. By the 1993-1994 season, an estimated 56-68 pairs had established territories in the wild with a post-breeding population, including floating birds and independent young, of 222-286. Mauritius kestrels are relatively sedentary; 89% of ringed birds found nesting were less than 5 km from their release of fledging site. Since the pesticides responsible for their decline are no longer used, numbers should continue to rise through natural recruitment. The distribution of suitable habitat suggests that an eventual population of 500-600 kestrels on Mauritius is possible. -from Authors
December 2007
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25 Reads
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15 Citations
International Zoo Yearbook
December 2007
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143 Reads
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10 Citations
International Zoo Yearbook
January 2007
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355 Reads
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27 Citations
July 2006
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14 Reads
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3 Citations
Ornithology
The following critiques express the opinions of the individual evaluators regarding the strengths, weaknesses, and value of the books they review. As such, the appraisals are subjective assessments and do not necessarily reflect the opinions of the editors or any official policy of the American Ornithologists' Union.
July 2005
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5 Reads
Ornithology
Citations (26)
... Also, Tamisier (1976) described attacks by Peregrine Falcons on Northern Pintails (Ana acuta) at Lacassine NWR, Louisiana, in which the ducks initially took flight at the sight of the falcon then suddenly landed on the water to avoid capture. White et al. (2020) stated that Peregrine Falcons sometime follow and use humans, animals, or machines (including motorboats) to flush prey, citing Palmer (1988) and personal observations of one of the species account authors. Palmer (1988) noted accounts of birds following humans (Wilson andBonaparte 1832, Kenyon 1961) to take advantage of flushed birds. ...
- Citing Chapter
January 2002
... The rough-legged buzzard (Buteo lagopus) exhibits some flexibility in its migration schedule and site fidelity, but it can occasionally show irruptive movements 15 . The peregrine falcon (Falco peregrinus) is a regular migrant that has a fixed migration schedule in combination with high breeding-site fidelity [16][17][18] . ...
- Citing Article
January 2002
The Birds of North America Online
... Across their circumpolar distribution, gyrfalcons are ptarmigan (Lagopus spp.) specialists, although they also prey on a variety of other avian and mammalian species. Ptarmigan are especially important prey during pair bonding and egg production (Booms et al. 2008). During courtship and the incubation period, males offer prey to the females (Barichello 2011). ...
- Citing Article
October 2008
The Birds of North America Online
... We recorded (iv) timing of prey delivery and (v) the time parents spent feeding nestlings by recording the time passed between the first picture that feeding is visible until the last picture the parent is present moving on the nest. In gyrfalcons, females are bigger than males (Booms et al. 2020), so we determined (vi) sex of the parent delivering the prey or feeding the nestlings by evaluating their size when both parents were on the nest at the same time, and otherwise by recognising colour and feather patterns on the back and tail. We evaluated whether the prey item was (vii) a fresh delivery or a cached item from a previous delivery when we saw a partially eaten prey item return to the nest, which is a common behaviour in gyrfalcons (Booms and Fuller 2003b). ...
- Citing Article
March 2020
... It is possible that the presence of Golden Eagles, which were already on territories influenced peregrine nest site selection in the study area. However, peregrines also utilize a much wider range of nesting substrates and more avian prey than Golden Eagles [60]. This could contribute to some of the differences we observed in distribution between the two species. ...
- Citing Article
March 2020
... However, there are geographic areas such as those in northern Greenland and Iceland that do have a high percentage of similarly coloured gyrfalcons observed among breeding individuals. These geographic differences in colour could be the result of adaptive responses to local environments, such as for camouflage or because of metabolic costs associated with pigment synthesis (Potapov & Sale 2005; but see Cade 2006). However, local fixation of alleles associated with these differences would require restricted gene flow between populations, and little information exists on gyrfalcon immigration or dispersal patterns over long distances and between geographical areas (Cade et al . ...
- Citing Article
July 2006
Ornithology
... Conservation efforts in forms of habitat management (Brooks and Temple 1990: Scott and MorrisOll 1990: Gawlik and Bildstein 1993: Prescott and Collister 1993: Telfer 1993 and propagation of individuals in captivity, including artificial incubation and hand rearing (Cade 1992;Kuehler et al. 1993) have been proposed and in some cases, are underway. ...
- Citing Article
November 1992
Ornithological Applications
... Clearly, along with Loggerhead Shrikes L. ludovicianus, these predatory songbirds are suffering greatly, a family-wide trend noted many years ago following the convening of the 1 st International Shrike Symposium (Yosef and Lohrer 1995). Furthermore, thirty-years following that first symposium little information yet exists on the natural history, demographic parameters, and population trends of Northern Shrikes breeding across northern Canada and Alaska as this species breeds in difficult to access locations and habitats (riparian zones along Arctic and subarctic rivers flowing through tundra and muskeg bogs along the ecotone of the boreal forest and this tundra), has likely never been common, and is labor intensive to capture on the wintering grounds spending its time in open landscapes occupying large winter territories (Atkinson 1993, Atkinson and Cade 1993). Northern Shrike wintering numbers are cyclic with low predictability in site occupancy from year to year (Rimmer. ...
- Citing Article
- Full-text available
August 1993
Ornithological Applications
... In 1999 Cade and Nielsen (2011) conducted a helicopter survey of falcon eyries in about 6,000 km 2 of the Jameson Plateau, the largest ice-free area in the Scoresbysund region, and a dog-sledge trip in early June to the Liverpool Coast from Ittoqqortoormitt to Cape Höegh, about 30 km of the Liverpool Coast. They found four active nests with incubating females on the Jameson plateau, and a skiing colleague found one on the Liverpool Coast. ...
- Citing Conference Paper
December 2011
... This has to do with the adaptation to new expansive ecologies and a wide range of prey, including larger ones such as the Willow Grouse (Lagopus lagopus) and Ptarmigan (L. mutus) (59). It is then expected that genes that are associated with body size, physiology, reproduction, and behavior to be under adaptive selection in a speciation trajectory (60). ...
- Citing Article
December 2011