Determination of Grazing Values of Native Vegetation on Southern Pine Forest Ranges

Ecology ◽  
1946 ◽  
Vol 27 (3) ◽  
pp. 195-204 ◽  
Author(s):  
R. S. Campbell
Keyword(s):  
Pine Forest ◽  
Native Vegetation ◽  
Southern Pine ◽  
Southern Pine Forest

Managing the Southern Pine Forest—Retained Wetland Interface for Wildlife Diversity: Research Priorities

Wetlands ◽  
2010 ◽  
Vol 30 (3) ◽  
pp. 381-391 ◽  
Author(s):  
Phillip D. Jones ◽  
Brice B. Hanberry ◽  
Stephen Demarais
Keyword(s):  
Research Priorities ◽  
Pine Forest ◽  
Southern Pine ◽  
Southern Pine Forest ◽  
Diversity Research

Predation of Natural and Artificial Nests in a Southern Pine Forest

The Auk ◽  
2000 ◽  
Vol 117 (3) ◽  
pp. 739-747
Author(s):  
Robert B. Hamilton
Keyword(s):  
Pine Forest ◽  
Southern Pine ◽  
Artificial Nests ◽  
Southern Pine Forest

scholarly journals Predation of Natural and Artificial Nests in a Southern Pine Forest

The Auk ◽  
2000 ◽  
Vol 117 (3) ◽  
pp. 739-747 ◽  
Author(s):  
Jeffrey J. Buler ◽  
Robert B. Hamilton
Keyword(s):  
Pine Forest ◽  
Artificial Nest ◽  
Artificial Nests ◽  
Corvus Brachyrhynchos ◽  
Coturnix Coturnix ◽  
American Crows ◽  
Natural Nest ◽  
Mammalian Predators ◽  
The Difference ◽  
Southern Pine Forest

Abstract We compared predation of artificial open-cup nests baited with Japanese Quail (Coturnix coturnix) eggs with predation of natural open-cup nests during 1997 and 1998 in a Louisiana pine forest to assess the assumption that predation of artificial nests is an index to that of natural nests. Cameras were placed at randomly selected natural and artificial nests in shrubs to document predators. Predation at artificial-nest plots was positively correlated with predation at adjacent natural-nest plots overall, although inconsistently by year. Artificial nests were almost exclusively depredated by corvids, but quail eggs were too large to be broken by small-mouthed mammalian predators. American Crows (Corvus brachyrhynchos) appeared to be important predators of natural nests. Predation of natural nests was independent of predation at other nests, but predation of artificial nests by crows was spatially and temporally clumped. Crows may have learned the location of artificial-nest plots, and predation of artificial nests increased significantly between years, contrary to predation of natural nests. Predation of artificial nests did not exhibit seasonal variation like that of natural nests. Overall, predation of artificial shrub nests did not accurately mimic that of natural shrub nests. Changes in procedures for artificial-nest studies that reduce spatially and temporally clumped predation and prevent the exclusion of small-mouthed predators could increase the suitability of such studies as a model for predation at natural nests. However, the difference in labor effort between studies of natural nests versus artificial nests that incorporate the changes we recommend likely would disappear, which would reduce the attractiveness of artificial-nest studies as an experimental model.

Retention of External and Internal Markers by Southern Pine Beetles (Coleoptera: Scolytidae) During Gallery Construction

1998 ◽  
Vol 33 (2) ◽  
pp. 221-232 ◽  
Author(s):  
Douglas J. Rhodes ◽  
Jane Leslie Hayes ◽  
Chris Steiner
Keyword(s):  
Dendroctonus Frontalis ◽  
Southern Pine ◽  
Fluorescent Powder ◽  
Mark Release Recapture ◽  
Pine Beetle ◽  
Marking Technique ◽  
Southern Pine Beetles ◽  
Internal Marker ◽  
Pine Beetles

If retained, markers used in mark-release-recapture studies of bark beetle dispersal could provide valuable tools in the determination of post-dispersal fate. Retention of the internal marker rubidium (Rb) and of the external marker fluorescent powder during egg gallery construction, oviposition, and feeding were quantified at intervals from 0 to 96 h by allowing marked Southern pine beetles, Dendroctonus frontalis Zimmermann, to carry out these activities in untreated host material. Significant differences in Rb concentrations were found between fed and unfed Rb-marked beetles at all intervals after 12 h. Unfed Rb-marked beetles were detectable at all intervals, whereas reliable detection of fed Rb-marked beetles declined with time. Over 90% of fed southern pine beetle marked with fluorescent powder were detectably marked after 96 h, while less than 50% of the Rb-marked beetles were detectable after 72 h. Neither marking technique adversely affected the gallery length or number of eggs produced by marked beetles compared to unmarked beetles allowed to excavate for 96 h. Practical aspects of both techniques are considered.

scholarly journals Floristic core of the Russian Plain pine forests along Pinus sylvestris southern borders

2021 ◽  
Vol 875 (1) ◽  
pp. 012076
Author(s):  
N O Kin
Keyword(s):  
Pinus Sylvestris ◽  
Pine Forest ◽  
Pine Forests ◽  
Russian Plain ◽  
Forest Steppe ◽  
Southern Limit ◽  
Forest Flora ◽  
The Core ◽  
Significant Distance

Abstract Pine forests - forest tracts on the sandy left banks, where the main area is occupied by plant communities with a predominance of Pinus sylvestris. Due to the significant distance from each other, the floras of the pine forests differ. However, the flora of these pine forests also shares common characteristics. In order to establish the floristic unity of the forests at the southern limit of the distribution of Pinus sylvestris, work was carried out to identify their floristic core. For 20 years, floristic surveys have been carried out in the forests of the steppe and forest-steppe zones. A general floristic list was compiled, with the identification of aboriginal and alien fractions, and the floristic core was established. Revealed: the core of the flora is determined by the pine forest flora with the lowest number of species among the comparable pine forests. The core of the flora of the studied pine forests included 30.8% of the species of the general flora. An increase in the number of analyzed floras will bring accuracy to the determination of the floristic core. This will make it possible to form an understanding of the pine forest flora as a single floristic complex.

scholarly journals Morphometric characteristics and hydrological dynamics in micro-basins with different land uses of cerrado soils in Mato Grosso

2020 ◽  
pp. 1909-1922
Author(s):  
Wellington Azambuja Magalhães ◽  
Ricardo Santos Silva Amorim ◽  
Maria O’Healy Hunter ◽  
Edwaldo Dias Bocuti ◽  
Tulio Gonçalves dos Santos
Keyword(s):  
Land Use ◽  
Water Flux ◽  
Water Retention Curve ◽  
Native Vegetation ◽  
Hydrologic Regime ◽  
Morphometric Characteristics ◽  
Mato Grosso ◽  
Basin Scale ◽  
Morphometric Characterization

Understanding the hydrologic regime, and monitoring runoff at the micro-basin scale is critical for understanding water availability, and for managing water resources in strategic biomes such as the cerrado. The objective of this research is to evaluate morphometric characteristics and the hydrologic regime and determine their relationships with soil characteristics and typical land-use in the cerrado biome. To reach this objective morphometric characterization, runoff and precipitation monitoring, and determination of the water retention curve were conducted in three micro-basins in the municipality of Campo Verde, Mato Grosso. These micro-basins each have a different, but regionally typical land-use and were selected strategically to represent this area of cerrado: agriculture, pasture and native vegetation. The results obtained allow for the analysis of the hydrologic regime throughout the period measured. Micro-basins with native vegetation and pasture, with greater altimetric range and more sandy soils, show greater erosion. Despite this, the micro-basin with pasture cover showed greater regulation of runoff. The micro-basin with agriculture showed less regularization of water flux due to the physical characteristics of the local soils.

scholarly journals Response of vegetation to sheep dung addition in a degraded Cerrado area

2019 ◽  
Vol 23 (1) ◽  
pp. 47-52 ◽  
Author(s):  
Danilo S. Teixeira ◽  
Andreia A. Rezende ◽  
Luciola S. Lannes
Keyword(s):  
Functional Groups ◽  
Soil Nutrient ◽  
Nutrient Concentrations ◽  
Soil Conditions ◽  
Hydroelectric Power Station ◽  
Native Vegetation ◽  
Hydroelectric Power ◽  
Power Station ◽  
Power Stations

ABSTRACT Cerrado is the second largest biome in Brazil and is classified as a biodiversity hotspot. The establishment of hydroelectric power stations in Brazil originated degraded areas due to the removal of soil for construction of dams, in which native vegetation sometimes fails to reestablish due to the bad soil conditions. Sheep excrete most of the nutrients they ingest, such as phosphorus, calcium, potassium and nitrogen. This study aimed at investigating whether sheep dung contributes to the improvement of soil quality and stimulates the process of ecological succession in areas affected by the construction of the hydroelectric power station of Ilha Solteira. Four areas were selected, located at the Experimental Farm of Unesp Ilha Solteira/SP, and ten plots of 1 m2 each were established. From October 2014 to December 2015, five replicates received 150 g fresh sheep dung every 15 days. In December 2015 soil sample from top 0.10 m was collected for the determination of soil attributes. Aboveground biomass was also collected, separated into four functional groups, oven-dried and weighed. Data were analysed to check the effect of dung addition upon soil and vegetation variables. Dung addition stimulated the development of several functional groups and changed soil nutrient concentrations in all four studied areas.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

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