Effects of Experimental Nestling Harvest on Prairie Falcons

Conway, Courtney J.; Runde, Douglas E.; Abbate, Dennis

doi:10.2307/3808944

Cited by 5 publications

(7 citation statements)

References 10 publications

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“…We encourage study in this area but recognize that the logistics of such work will be daunting given the difficulty measuring population responses among nonbreeders. Previous attempts to estimate sustainable harvest rates for raptor populations have examined empirical data on rates of recovery of depleted populations, sustainability of populations under persecution, or, in one case, population responses to experimental harvest (Conway et al 1995, Kenward 1997. The conclusions of these analyses generally mirror what we found: that many raptor populations can sustain eyas or passage harvest rates of 10-20% and sometimes higher.…”

Section: Discussionmentioning

confidence: 99%

“…For example, in Great Britain, the northern goshawk was reestablished as a breeding species from escaped falconry stock (Kenward 1974, Kenward et al 1981. Second, Conway et al (1995) found that nestling prairie falcons left in nests from which siblings were harvested had higher survival and breeding-recruitment rates than nestlings from unharvested nests. This suggests that in the case of eyas harvest there may be a compensatory effect of harvest on survival of remaining nestlings.…”

Section: Speciesmentioning

confidence: 99%

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Effects of Falconry Harvest on Wild Raptor Populations in the United States: Theoretical Considerations and Management Recommendations

Millsap

Allen

2006

Wildlife Society Bulletin

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We used recent population data and a deterministic matrix model that accounted for important aspects of raptor population biology to evaluate the likely impact of falconry harvest (including take of different age classes) on wild raptor populations in the United States. The harvest rate at maximum sustainable yield (MSY) ranged from 0.03 to 0.41 for the species examined. At least for peregrine falcons (Falco peregrinus), harvest rate at MSY was greatest for nestlings and lowest for adults. The quality of demographic data for the species influenced MSY. For most species the state of current knowledge probably underestimates the capacity for allowed harvest because estimates of vital rates, particularly survival, are biased low, because emigration is not distinguished from survival. This is offset somewhat by biases that might overestimate sustainability inherent in MSY-based analyses and deterministic models. Taking these factors into consideration and recognizing the impracticality of monitoring raptor populations to determine actual effects of harvest, we recommend that falconry harvest rates for juvenile raptors in the United States not exceed one-half of the estimated MSY up to a maximum of 5%, depending on species-specific estimates of capacity to sustain harvest. Under this guideline, harvest rates of up to 5% of annual production are supported for northern goshawks (Accipter gentilis), Harris's hawks (Parabuteo unicinctus), peregrine falcons, and golden eagles (Aquila chrysaetos); lower harvest rates are recommended for other species until better estimates of vital rates confirm greater harvest potential. (WILDLIFE SOCIETY BULLETIN 34(5):1392-1400 2006)

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Section: Discussionmentioning

confidence: 99%

Section: Speciesmentioning

confidence: 99%

Effects of Falconry Harvest on Wild Raptor Populations in the United States: Theoretical Considerations and Management Recommendations

Millsap

Allen

2006

Wildlife Society Bulletin

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“…Prairie Falcons nest primarily on cliffs (Skinner 1961, Steenhof 1998, including buttes (Squires et al 1993, Conway et al 1995, canyon walls (Ogden andHornocker 1977, Conway et al 1995), rock outcrops (Marsh 1936), ridges (Denton 1975), cave walls (Pitcher 1977), and mine highwalls (Phillips and Beske 1990). Nest cliffs are made of a variety of rock types, but where nesting substrates are soft, such as silt or unconsolidated rock, nest sites may weather and become unusable through time (Oliphant et al 1976, Allen 1987b.…”

Section: Suitable Habitatmentioning

confidence: 99%

Effects of management practices on grassland birds: Prairie Falcon

DeLong¹,

Steenhof²

2004

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This report is one in a series of literature syntheses on North American grassland birds. The need for these reports was identified by the Prairie Pothole Joint Venture (PPJV), a part of the North American Waterfowl Management Plan. The PPJV adopted a goal to stabilize or increase populations of declining grasslandand wetland-associated wildlife species in the Prairie Pothole Region. To further that objective, it is essential to understand the habitat needs of birds other than waterfowl, and how management practices affect their habitats. The focus of these reports is on management of breeding habitat, particularly in the northern Great Plains.

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“…Sensitivity analysis showed that lambda dropped to 4 when after first-year survival dropped to only 88%; lambda dropped to about 0.93 when survival was lowered to 82%. Conway et al (1995) conducted an experiment to evaluate the effects of removing nestling prairie falcons (Falco mexicanus) on the breeding population in an attempt to simulate the impacts of falconry. They removed ' 138 of 451 nestlings (31 % of natality) from 20 temtories during 1982-89, along with a control area.…”

Section: Survivorship and Population Projectionsmentioning

confidence: 99%

Development of a practical modeling framework for estimating the impact of wind technology on bird populations

Morrison¹,

Pollock²

1997

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c> Printed on paper containing at least 50% wastepaper, including 20% postconsumer waste ForewordOne of the most pressing environmental concerns related to wind project development is the potential for avian fatalities caused by the turbines. In order to understand the potential for this problem, pre-construction avian surveys are often required. However, these can be expensive and require significant amounts of time in order to gather the empirical data necessary to fully understand the potential impacts. Then, the results may suggest that moving forward with such a project in the wind resource area just evaluated may be ill advised. This report describes a modeling framework for evaluating potential windplant impacts that can be generalized to most bird species. This modeling framework could be used to get a preliminary understanding of the likelihood of significant impacts to birds in a cost-effective way. EXECUTIVE SUMMARYThe goal of this project is $to develop a useful, practical modeling framework for evaluating potential wind power plant impacts that can be generalized to most bird species. We accomplish this by (1) reviewing the major factors that can influence the persistence of a wild population; (2) briefly reviewing various models that can aid in estimating population status and trend, including methods of evaluating model structure and performance; (3) reviewing survivorship and population projections; and (4) developing a framework for using models to evaluate the potential impacts of wind development on birds.We begin with a review of demography. Demography is the study of population statistics, including births, deaths, immigration, and emigration. From demography, we know that conditions leading to extinction are most likely to occur in small populations. Demographic rates vary because individuals do not sunrive for the same length of time, individuals vary in the number of offspring they bear, individuals often have low birth rates, and so forth. Adult survivorship is usually very high, especially in long-lived species (such as raptors). Therefore, estimating adult survivorship tells one a lot about population status. In addition, in most monogamous species, it is female survivorship that is most important to population persistence. At a minimum, then, quantifying aduilt survivorship provides a preliminary, basic indication of the status of the population. Modeling genetics is not likely to be as important as modeling demographic and ecological processes in evaluating population persistence. This is based, in part, on the lack of our sufficient Understanding of genetics to use it as a basis for management. Thus, practical consideratnons were the overriding factor in this conclusion. Still, genetics may be a priority in small, isolated populations.Random environmental events such as catastrophic fires, hurricanes, and disease can also have pronounced effects on small populations. Such factors can also have pronounced effects on large populations that are spatially dlivided into subpopulations. ...

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Effects of Experimental Nestling Harvest on Prairie Falcons

Cited by 5 publications

References 10 publications

Effects of Falconry Harvest on Wild Raptor Populations in the United States: Theoretical Considerations and Management Recommendations

Effects of Falconry Harvest on Wild Raptor Populations in the United States: Theoretical Considerations and Management Recommendations

Effects of management practices on grassland birds: Prairie Falcon

Development of a practical modeling framework for estimating the impact of wind technology on bird populations

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