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Myeong, Soojeong; Nowak, David J.; Hopkins, Paul F.; Brock, Robert H.

doi:10.1023/a:1025687711588

Cited by 102 publications

(22 citation statements)

References 22 publications

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“…Random points were generated in ArcGIS and were restricted to pinyon-juniper woodlands and juniper savannahs as outlined by KAFB (Johnson et al 2013). Thirty-nine out of 50 points were accurately classified (78%), which we deemed to be suitable for subsequent analyses (Myeong et al 2001).…”

Section: Broad-scale Cover Proportionsmentioning

confidence: 99%

A multiscale analysis of Gray Vireo (Vireo vicinior) nest-site selection in central New Mexico

Harris¹,

Smith²,

McMurry³

2020

ACE

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There are many gaps in our understanding of Gray Vireo (Vireo vicinior) life history especially as it relates to nesting ecology. Our objective was to determine habitat features selected by Gray Vireos for nesting to improve management strategies for breeding populations. We searched for Gray Vireo nests on Kirtland Air Force Base in Albuquerque, New Mexico from 2016 to 2017. We estimated Gray Vireo nest-site selection at the tree level, the surrounding vegetation, and at two broader scales corresponding to selection within territories. Nest-site selection was estimated for 99 Gray Vireo nests. For tree-level selection, we compared characteristics of nesting trees with mean characteristics from groups of six randomly selected one-seed junipers (Juniperus monosperma) within a 25m radius. We also compared overall vegetation characteristics at the 25-m scale for nesting plots and 66 randomly selected plots. Broadscale cover proportions of nest sites and random points were estimated at 50-and 100-m radius spatial scales using a geographic information system. Gray Vireos selected nesting trees that were taller and wider than other adjacent junipers. Selection of vegetation characteristics surrounding nests showed a similar pattern, where Gray Vireos nested in areas where junipers were taller, wider, and had greater foliage density than was randomly available. Broad-scale analyses suggested that Gray Vireos selected nest sites in areas with higher proportions of junipers at low elevations (< 1954 m), and lower proportions of junipers in higher elevations (> 1954 m); however, juniper proportions at nest sites consistently ranged from 15 to 30% of available cover. Gray Vireos also tended to select areas with less pinyon pine than what was randomly available at the 100-m radius scale. Future management strategies should provide large patches of old-growth juniper to optimize Gray Vireo nesting habitat. Analyse multiéchelle de la sélection du site de nidification du Viréo gris (Vireo vicinior) dans le centre du Nouveau-Mexique RÉSUMÉ. Notre compréhension du cycle biologique du Viréo gris (Vireo vicinior) est incomplète, particulièrement en ce qui a trait à l'écologie de nidification. Notre objectif était de déterminer les caractéristiques d'habitat recherchées par les Viréos gris durant la nidification afin d'améliorer les stratégies d'aménagement destinées aux populations nicheuses. Nous avons cherché des nids de viréos sur la base des forces aériennes de Kirtland à Albuquerque, au Nouveau-Mexique, en 2016 et 2017. Nous avons évalué la sélection des sites de nidification des viréos à l'échelle de l'arbre, de la végétation environnante et à deux autres échelles plus grandes à l'intérieur des territoires des oiseaux. Nous avons analysé la sélection du site de 99 nids de Viréos gris. En matière de sélection à l'échelle de l'arbre, nous avons comparé les caractéristiques des arbres abritant un nid avec les caractéristiques moyennes de groupes de six genévriers monospermes (Juniperus monosperma) tirés aléatoirement dans un ray...

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Section: Broad-scale Cover Proportionsmentioning

confidence: 99%

A multiscale analysis of Gray Vireo (Vireo vicinior) nest-site selection in central New Mexico

Harris¹,

Smith²,

McMurry³

2020

ACE

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“…The time integration does not correspond to the cluster age. This choice is motivated by the fact that (1) integrating longer in time does not have much physical meaning, since the Galactic potential is expected to have changed over the Galaxy lifetime, and also because (2) we are interested in the actual orbital parameters. We anyway tested a longer integration time of 5 Gyrs.…”

Section: Orbital Calculationmentioning

confidence: 99%

The origin of globular cluster FSR 1758

Yeh

Carraro

Корчагин

et al. 2020

A&A

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Context. Globular clusters in the Milky Way are thought to have either an in situ origin, or to have been deposited in the Galaxy by past accretion events, like the spectacular Sagittarius dwarf galaxy merger. Aims. We aim to probe the origin of the recently discovered globular cluster FSR 1758, often associated with some past merger event, and which happens to be projected toward the Galactic bulge, by a detailed study of its Galactic orbit, and to assign it to the most suitable Galactic component. Methods. We employ three different analytical time-independent potential models to calculate the orbit of the cluster by using the Gauss Radau spacings integration method. In addition, a time-dependent bar potential model is added to account for the influence of the Galactic bar. We run a large suite of simulations to account for the uncertainties in the initial conditions, in a Montecarlo fashion. Results. We confirm previous indications that the globular cluster FSR 1758 possesses a retrograde orbits with high eccentricity. The comparative analysis of the orbital parameters of star clusters in the Milky Way, in tandem with recent metallicity estimates, allows us to conclude that FSR1758 is indeed a Galactic bulge intruder. The cluster can therefore be considered an old metal poor halo globular cluster formed in situ and which is passing right now in the bulge region. Its properties, however, can be roughly accounted for also assuming that the cluster is part of some stream of extra-Galactic origin. Conclusions. We conclude that assessing the origin, either Galactic or extra-galactic, of globular clusters is surely a tantalising task. In any case, by using an Occam's razor argument, we tend to prefer an in situ origin for FSR 1758.

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“…Land cover types were adapted from the U S Geological Survey's National Land Cover Data classification system (Vogelmann et al 1998) (Table 1), with a minimum mapping unit of 5 m 2 . The land cover map was generated using a supervised classification of a 2000 2.8 m resolution 3-band color-infrared QuickBird image (Space Imaging Corporation) acquired in September 2002, assessed for accuracy against our high resolution aerial photos and ground referenced at Ailanthus sampling locations during the field survey (Myeong et al 2001). Ancillary digital environmental data included a roads vector layer and a digital elevation model (10 m postings).…”

Section: Study Area and Samplingmentioning

confidence: 99%

Spatial patterns of female Ailanthus altissima across an urban-to-rural land use gradient

2009

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Ailanthus altissima is an invasive, dioecious deciduous tree common at the interface between urban and rural areas in the mid-Atlantic region, U.S.A. To examine spatial patterns of abundance and associations with land use type, we mapped all mature female trees in nine 89.5 ha plots (805.5 ha total area) across a typical urban-to-rural land use gradient using aerial images obtained via remote sensing supplemented by detailed ground referencing. Rural plots were dominated by forest and had the lowest density of mature females (0.007 females ha −1 ); urban and suburban plots did not differ significantly in mean density (0.37 females ha −1 vs. 0.34 females ha −1 , respectively). Individuals in urban plots were more evenly distributed, but were not associated with a wider variety of land uses and were closer to roads or openings than those in suburban plots. Given less available habitat per unit area in urban than in suburban environments, these patterns suggest that Ailanthus fits the profile of an invasive species that may be proliferating outward from urban centers. With continued disturbances associated with development in the suburban areas, and timber harvesting in the rural areas, further spread of Ailanthus seems likely.

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Cited by 102 publications

References 22 publications

A multiscale analysis of Gray Vireo (Vireo vicinior) nest-site selection in central New Mexico

A multiscale analysis of Gray Vireo (Vireo vicinior) nest-site selection in central New Mexico

The origin of globular cluster FSR 1758

Spatial patterns of female Ailanthus altissima across an urban-to-rural land use gradient

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