Demographics of Black Vultures in North Carolina

Blackwell, Bradley F.; Avery, Michael L.; Watts, Bryan D.; Lowney, Martin

doi:10.2193/2006-146

Cited by 16 publications

(12 citation statements)

References 18 publications

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“…4) bounds the possible values for this growth rate, although we suspect we overstated uncertainty at the low ends of the parameter estimates. We note that the matrix model developed by Blackwell et al (2007), and based on the same data sources, produced an estimate of population growth for the North Carolina black vulture population of 10.6% annually (and also demonstrated the marked sensitivity of this growth rate to the estimate of ad survival rate). Our belief, therefore, is that the median estimate for r max (10.6%) is the best to work with at this time, although it is likely conservative.…”

Section: Scientific Considerationsmentioning

confidence: 72%

“…Black vultures, like other New and Old World vultures, exhibit delayed onset of sexual maturity. Blackwell et al (2007) demonstrated via a stage-structured matrix model that age-at-first-breeding must be closer to 5 years than to 8 years (the sole record for a known-age black vulture; Parker et al 1995). Age-at-first-breeding is typically 4 years in griffon vultures (Blanco andMartinez 1996, Sarrazin et al 1996) and 4-6 years in Cape vultures (Gyps coprotheres; Robertson 1984).…”

Section: Demography Of Black Vulturesmentioning

confidence: 99%

“…For a delayed breeder like the black vulture, age-or stage-structured matrix approaches are appropriate. Blackwell et al (2007) used such an approach to find a point estimate for growth rate and perform sensitivity analysis but did not seek specifically to estimate r max and did not formally incorporate estimates of uncertainty. However, as noted earlier (see also Blackwell et al 2007), limited species longitudinal data necessitate a degree of speculation in estimating uncertainty.…”

Section: Estimating R Maxmentioning

confidence: 99%

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Assessing Allowable Take of Migratory Birds

et al. 2009

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Legal removal of migratory birds from the wild occurs for several reasons, including subsistence, sport harvest, damage control, and the pet trade. We argue that harvest theory provides the basis for assessing the impact of authorized take, advance a simplified rendering of harvest theory known as potential biological removal as a useful starting point for assessing take, and demonstrate this approach with a case study of depredation control of black vultures (Coragyps atratus) in Virginia, USA. Based on data from the North American Breeding Bird Survey and other sources, we estimated that the black vulture population in Virginia was 91,190 (95% credible interval = 44,520‐212,100) in 2006. Using a simple population model and available estimates of life‐history parameters, we estimated the intrinsic rate of growth (rmax) to be in the range 7–14%, with 10.6% a plausible point estimate. For a take program to seek an equilibrium population size on the conservative side of the yield curve, the rate of take needs to be less than that which achieves a maximum sustained yield (0.5 × rmax). Based on the point estimate for rmax and using the lower 60% credible interval for population size to account for uncertainty, these conditions would be met if the take of black vultures in Virginia in 2006 was <3,533 birds. Based on regular monitoring data, allowable harvest should be adjusted annually to reflect changes in population size. To initiate discussion about how this assessment framework could be related to the laws and regulations that govern authorization of such take, we suggest that the Migratory Bird Treaty Act requires only that take of native migratory birds be sustainable in the long‐term, that is, sustained harvest rate should be

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Section: Scientific Considerationsmentioning

confidence: 72%

Section: Demography Of Black Vulturesmentioning

confidence: 99%

Section: Estimating R Maxmentioning

confidence: 99%

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Assessing Allowable Take of Migratory Birds

et al. 2009

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“…2) Another example is that of the black vulture Coragyps atratus , whose population is thriving and is currently estimated at 20 million individuals (Rich et al 2004, Blackwell et al 2007, Carrete et al 2009); it now constitutes the most abundant of the seven species of New World vultures (i.e. Cathartidae).…”

Section: Native Versus Non-native Species: An Inappropriate Dichotomymentioning

confidence: 99%

Another call for the end of invasion biology

Valéry

Fritz

Lefeuvre

2013

Oikos

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The restriction of invasion biology to non‐native species has been laid down as one founding principle of the discipline by many researchers. However, this split between native and non‐native species is highly controversial. Using a phenomenological approach and a more pragmatic examination of biological invasions, the present paper discusses how this dichotomy has restricted the relevance of the field, both from theoretical and practical viewpoints. We advocate the emergence of a broader disciplinary field.

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“…Also, air carriers recently have replaced four-engine aircraft with two-engine designs that markedly reduce the noise of their predecessors, which is suspected to reduce the distance at which animals can detect and react to aircraft (Solman, 1976;Kelly et al, 2001;Kelly and Allan, 2006). Another factor contributing to the observed increase in bird strikes is population growth of some species (e.g., Rusch et al, 1995;Waller and Alverson, 1997;Blackwell et al, 2007), especially larger animals (>2 kg) that present substantial hazards to aviation safety (Dolbeer et al, 2000;Dolbeer and Eschenfelder, 2002;.…”

Section: Introductionmentioning

confidence: 99%

Wildlife collisions with aircraft: A missing component of land-use planning for airports

Blackwell

DeVault

Fernández‐Juricic

et al. 2009

Landscape and Urban Planning

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a b s t r a c tProjecting risks posed to aviation safety by wildlife populations is often overlooked in airport land-use planning. However, the growing dependency on civil aviation for global commerce can require increases in capacity at airports which affect land use, wildlife populations, and perspectives on aviation safety. Our objectives were to (1) review legislation that affects airports and surrounding communities relative to managing and reducing wildlife hazards to aviation; (2) identify information gaps and future research needs relative to regulated land uses on and near airports, and the effects on wildlife populations; and (3) demonstrate how information regarding wildlife responses to land-use practices can be incorporated into wildlife-strike risk assessments. We show that guidelines for land-use practices on and near airports with regard to wildlife hazards to aviation can be vague, conflicting, and scientifically ill-supported. We discuss research needs with regard to management of stormwater runoff; wildlife use of agricultural crops and tillage regimens relative to revenue and safety; the role of an airport in the landscape matrix with regard to its effects on wildlife species richness and abundance; and spatial and temporal requirements of wildlife species that use airports, relative to implementing current and novel management techniques. We also encourage the development and maintenance of datasets that will allow realistic assessment of wildlife-strike risk relative to current airport conditions and anticipated changes to capacity. Land uses at airports influence wildlife populations, and understanding and incorporating these effects into planning will reduce risks posed to both aviation safety and wildlife species.Published by Elsevier B.V.

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Demographics of Black Vultures in North Carolina

Cited by 16 publications

References 18 publications

Assessing Allowable Take of Migratory Birds

Assessing Allowable Take of Migratory Birds

Another call for the end of invasion biology

Wildlife collisions with aircraft: A missing component of land-use planning for airports

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