scholarly journals Response of nesting northern Goshawks to logging truck noise Kaibab National Forest, Arizona

2012 ◽  
Vol 132 (3) ◽  
pp. 2063-2063 ◽  
Author(s):  
Teryl Grubb ◽  
Larry Pater ◽  
Angela Gatto ◽  
David Delaney
Keyword(s):  
National Forest ◽  
Kaibab National Forest ◽  
Northern Goshawks ◽  
Logging Truck

Response of nesting northern goshawks to logging truck noise in northern Arizona

2013 ◽  
Vol 77 (8) ◽  
pp. 1618-1625 ◽  
Author(s):  
Teryl G. Grubb ◽  
Larry L. Pater ◽  
Angela E. Gatto ◽  
David K. Delaney
Keyword(s):  
Northern Arizona ◽  
Northern Goshawks ◽  
Logging Truck

scholarly journals Gene Flow and Genetic Characterization of Northern Goshawks Breeding in Utah

The Condor ◽  
2004 ◽  
Vol 106 (4) ◽  
pp. 826-836 ◽  
Author(s):  
Sarah A. Sonsthagen ◽  
Sandra L. Talbot ◽  
Clayton M. White
Keyword(s):  
Gene Flow ◽  
Sequence Data ◽  
Single Case ◽  
Accipiter Gentilis ◽  
National Forest ◽  
Effective Population ◽  
Population Comparisons ◽  
Population Structuring ◽  
Northern Goshawks ◽  
Microsatellite Alleles

Abstract Adult movement and natal dispersal data demonstrate that Northern Goshawks (Accipiter gentilis) are able to travel over long distances, suggesting a large functional population. However, these data are unable to determine whether these movements contribute to gene flow among adjacent breeding areas. We used eight microsatellite DNA loci and mitochondrial DNA control-region sequence data to assess population structure of Northern Goshawks breeding in Utah. Goshawks had moderate levels of genetic variation at microsatellite loci (observed heterozygosity = 50%), similar to levels found in other medium-sized, highly mobile birds. Overall estimates of interpopulation variance in microsatellite alleles (FST = 0.011) and mtDNA haplotypes (ΦST = 0.126) were low and not significantly different from zero. Pairwise population comparisons using microsatellite markers revealed no differentiation among sampled sites, indicating that the functional population extends beyond Utah. However, pairwise population analyses of mtDNA uncovered a single case of differentiation between goshawks inhabiting Ashley National Forest, in northeastern Utah, and Dixie National Forest, in southwestern Utah. Low levels of population structuring observed in mtDNA between the two forests may be due to the smaller effective population size sampled by mtDNA, a cline of haplotypes across the West, or the presence of a contact zone between A. g. atricapillus and goshawks of southern Arizona and the Mexican Plateau. Flujo Genético y Caracterización Genética de Accipiter gentilis Reproduciéndose en Utah Resumen. Datos sobre el movimiento de los adultos de Accipter gentilis y la dispersión natal demuestran que A. gentilis es capaz de viajar largas distancias, lo que sugiere una gran población funcional. Sin embargo, dichos estudios no son capaces de determinar si estos movimientos contribuyen al flujo genético entre las áreas de reproducción. En este estudio se utilizaron ocho loci de microsatélites de ADN y secuencias de la región control del ADN mitocondrial para estimar la estructura poblacional de la unidad reproductiva de A. gentilis en Utah. Este halcón presentó niveles intermedios de variación genética en loci de microsatélites (heterocigosidad observada = 50%), similares a los niveles encontrados en otras aves de tamaño medio con gran dispersión. La estimación total inter-poblacional de la varianza en alelos de microsatélites (FST = 0.011) y haplotipos de ADNmt (ΦST = 0.126) resultaron ser bajas y no significativamente diferentes de cero. Las comparaciones entre pares de poblaciones utilizando marcadores de microsatélites no mostraron diferencias entre los sitios muestreados, indicando que la población funcional se extiende más allá de Utah. Sin embargo, el análisis con ADNmt entre pares de poblaciones mostró en un sólo caso una diferenciación entre la población de A. gentilis que habita en el Bosque Nacional Ashley al noreste de Utah y la población de A. gentilis del Bosque Nacional Dixie, al sureste de Utah. Los niveles bajos de estructura poblacional observados con ADNmt entre los dos bosques pueden deberse a un bajo tamaño poblacional efectivo muestreado con ADNmt, a una disminución de haplotipos hacia el oeste o a la presencia de una zona de contacto entre A. g. atricapillus y Accipiter gentilis del sureste de Arizona y la meseta Mexicana.

scholarly journals Logging truck noise near nesting northern goshawks

1998 ◽  
Author(s):  
Teryl G. Grubb ◽  
Larry L. Pater ◽  
David K. Delaney
Keyword(s):  
Northern Goshawks ◽  
Logging Truck

An Introduced Breeding Population of Chrysemys picta marginata in the Kaibab National Forest, Northern Arizona

2019 ◽  
Vol 38 (1) ◽  
pp. 91
Author(s):  
Jeffrey E. Lovich ◽  
Bruce Christman ◽  
Kristy Cummings ◽  
Jenna Norris ◽  
Shellie Puffer ◽  
...  
Keyword(s):  
Breeding Population ◽  
Chrysemys Picta ◽  
National Forest ◽  
Northern Arizona ◽  
Kaibab National Forest

Microsatellite survey reveals possible link between triploidy and mortality of quaking aspen in Kaibab National Forest, Arizona

2015 ◽  
Vol 45 (10) ◽  
pp. 1369-1375 ◽  
Author(s):  
Groves B. Dixon ◽  
Laura E. DeWald
Keyword(s):  
United States ◽  
Environmental Factors ◽  
Microsatellite Markers ◽  
Populus Tremuloides ◽  
Ploidy Level ◽  
National Forest ◽  
Quaking Aspen ◽  
Predisposing Factor ◽  
Kaibab National Forest ◽  
Crown Dieback

In the southwestern United States, populations of quaking aspen (Populus tremuloides Michx.) are experiencing widespread mortality. Although environmental factors contributing to mortality have been well characterized, less is known about how genotype and particularly ploidy level affect susceptibility. We used five microsatellite markers to infer the ploidy level of 212 aspen stems in Kaibab National Forest, Arizona. Many multilocus genotypes showed three alleles at one or more loci, suggestive of frequent triploidy among our samples. Sites populated with putative triploids had higher mortality. In addition, heterozygosity was positively associated with mortality and crown dieback. Our results suggest that triploidy is a predisposing factor for aspen mortality in Kaibab National Forest.

scholarly journals Artificial Project Time Horizons In The Absence Of Discounting: The Case Of Canyon Forest Village

2011 ◽  
Vol 8 (1) ◽  
pp. 115-122
Author(s):  
Dennis Foster ◽  
Craig Bain
Keyword(s):  
Environmental Impact ◽  
Grand Canyon ◽  
Forest Service ◽  
National Forest ◽  
Environmental Impact Statement ◽  
Time Value Of Money ◽  
Northern Arizona ◽  
Time Value ◽  
Kaibab National Forest ◽  
Value Of Money

In the summer of 1997, the Kaibab National Forest released the Draft Environmental Impact Statement for Tusayan Growth. This report analyzed various scenarios involving the transfer of National Forest land at the boundary of the Grand Canyon National Park to a private developer, in exchange for private inholdings scattered throughout the Kaibab National Forest in northern Arizona. The resulting private development was to be called Canyon Forest Village, and would include hotels, visitor facilities, private housing, community facilities and a transportation center for tourists accessing the Grand Canyon. The proposed build out of Canyon Forest Village (CFV) was to take place from 1999 to 2010. Consequently, the Forest Service analysis used that time frame as the basis for calculating the economic impacts CFV would be expected to have on local economies in the northern Arizona region. The Draft Environmental Impact Statement (EIS) concluded that overall growth in demand for lodging in northern Arizona would be robust over those years, and that CFV would have no net negative impacts. The results of the Draft EIS were sharply contested during the public comment phase, and, in the summer of 1998, a Supplement to the Draft Environmental Impact Statement for Tusayan Growth was issued. This document used a different modeling procedure and changed its primary focus to two, smaller, CFV proposals, involving only 900 and 1,270 hotel rooms. The Supplement did conclude that there would be some negative impacts to the communities surrounding Grand Canyon. The results of the Supplemental Draft EIS were also contested during the public comment phase following its release, although a year later, in the summer of 1999, the Forest Service issued a Final EIS and adopted the CFV proposal for 1,270 rooms. One peculiarity of the Forest Service reports, throughout this process, was the failure to identify an explicit discount rate of interest in order to identify costs and benefits in terms of their present value. While EIS documentation has been required for many years, the obvious focus is on purely environmental concerns and the analyses tend to be based on scientific findings. The inclusion of a socioeconomic analysis necessitates a careful accounting of benefits and costs. While this EIS is not the first to include an explicit accounting of economic benefits and costs, it may serve as a harbinger of more reporting of this type. Unless those with an appreciation of the discounting process, especially economists and accountants, are included in these analyses, present values may be employed only on an erratic basis, making the results of such reports difficult, if not impossible, to adequately interpret. This article applies basic and commonly accepted time value of money principles to an EIS report. Although an economic analysis was provided as part of the report, the time value of money was ignored. In order to present a viable economic impact, these basic financial tenants must be employed. The authors used basic time value of money principles with reasonable discount rates. The result is that impacts could be as much as six times greater than the values given by the Forest Service, representing upwards of one hundred and fifty million dollars.

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