Canopy Closure, Competition, and the Endangered Dusky Gopher Frog

2007 ◽  
Vol 71 (6) ◽  
pp. 1845-1852 ◽  
Author(s):  
NICOLE Y. THURGATE ◽  
JOSEPH H. K. PECHMANN
Keyword(s):  
Canopy Closure ◽  
Dusky Gopher Frog

Canopy closure estimates with GreenOrbs

2009 ◽  
Author(s):  
Lufeng Mo ◽  
Yuan He ◽  
Yunhao Liu ◽  
Jizhong Zhao ◽  
Shao-Jie Tang ◽  
...  
Keyword(s):  
Canopy Closure

Roost-site selection and roosting ecology of forest-dwelling bats in southern British Columbia

1996 ◽  
Vol 74 (10) ◽  
pp. 1797-1805 ◽  
Author(s):  
Maarten J. Vonhof ◽  
Robert M. R. Barclay
Keyword(s):  
British Columbia ◽  
Ponderosa Pine ◽  
Tree Height ◽  
Canopy Closure ◽  
Ambient Conditions ◽  
White Pine ◽  
Roosting Ecology ◽  
Site Preferences ◽  
Roost Trees ◽  
Lasionycteris Noctivagans

We used radiotelemetry to examine the roost-site preferences of four species of tree-roosting bats (Eptesicus fuscus, Lasionycteris noctivagans, Myotis evotis, and M. volans) in southern British Columbia, Canada, by radio-tracking bats to their day roosts. We found a total of 21 roost trees: 14 roosts were beneath loose bark, 5 were in cavities excavated by woodpeckers, and 2 were in natural cavities. Entrance height increased with tree height, but roost entrances tended to be situated below the level of the canopy. Of the 22 tree and site variables examined, only 3 significantly discriminated between roost trees and available trees: tree height, distance to the nearest available tree, and percent canopy closure. Bats preferred tall trees associated with low percent canopy closure and a short distance to the nearest available tree. Bats roosted in western white pine, and to a lesser extent ponderosa pine and western larch, in intermediate stages of decay more often than would be expected at random. Bats switched roosts frequently. The distance between subsequent roost trees was short, suggesting a degree of fidelity to a particular group of trees or area of forest. The number of days of rain during the roosting period significantly influenced the number of days spent in a particular roost, and thus ambient conditions may restrict the frequency with which bats can switch roosts.

scholarly journals ASSESSING THE CANOPY INTEGRITY USING CANOPY DIGITAL IMAGES IN SEMIDECIDUOUS FOREST FRAGMENT IN SÃO CARLOS - SP- BRAZIL1

2017 ◽  
Vol 41 (5) ◽  
Author(s):  
Thiago Yamada ◽  
Emerson Carlos Pedrino ◽  
João Juares Soares ◽  
Maria do Carmo Nicoletti
Keyword(s):  
Digital Image Analysis ◽  
Digital Images ◽  
Research Work ◽  
Canopy Structure ◽  
Canopy Cover ◽  
Relevant Information ◽  
Canopy Closure ◽  
Forest Fragment ◽  
Semideciduous Forest

ABSTRACT It is well-known that conducting experimental research aiming the characterization of canopy structure of forests can be a difficult and costly task and, generally, requires an expert to extract, in loco, relevant information. Aiming at easing studies related to canopy structures, several techniques have been proposed in the literature and, among them, various are based on canopy digital image analysis. The research work described in this paper empirically compares two techniques that measure the integrity of the canopy structure of a forest fragment; one of them is based on central parts of canopy cover images and, the other, on canopy closure images. For the experiments, 22 central parts of canopy cover images and 22 canopy closure images were used. The images were captured along two transects: T1 (located in the conserved area) and T2 (located in the naturally disturbance area). The canopy digital images were computationally processed and analyzed using the MATLAB platform for the canopy cover images and the Gap Light Analyzer (GLA), for the canopy closure images. The results obtained using these two techniques showed that canopy cover images and, among the employed algorithms, the Jseg, characterize the canopy integrity best. It is worth mentioning that part of the analysis can be automatically conducted, as a quick and precise process, with low material costs involved.

The effect of canopy closure on chimpanzee nest abundance in Lagoas de Cufada National Park, Guinea-Bissau

Primates ◽  
2014 ◽  
Vol 55 (2) ◽  
pp. 283-292 ◽  
Author(s):  
Joana Sousa ◽  
Catarina Casanova ◽  
André V. Barata ◽  
Cláudia Sousa
Keyword(s):  
National Park ◽  
Canopy Closure ◽  
Guinea Bissau ◽  
Nest Abundance

Shade Tolerance as Reflected in Population Structures of the Woody Weed, Groundsel Bush (Baccharis halimifolia L.)

1979 ◽  
Vol 27 (5) ◽  
pp. 609 ◽  
Author(s):  
FD Panetta
Keyword(s):  
Carrying Capacity ◽  
Shade Tolerance ◽  
Seedling Recruitment ◽  
Pinus Elliottii ◽  
Slash Pine ◽  
Dominant Factor ◽  
Canopy Closure ◽  
Baccharis Halimifolia ◽  
Population Structures

Previously documented shade tolerance in establishing seedlings of groundsel bush (Baccharis halimifolia L.) was reflected in the similarity of the size structures of populations growing within slash pine (Pinus elliottii var. ellottii Engelm.) stands of differing ages. The accumulation of litter appeared to be the dominant factor leading to the cessation of seedling recruitment following canopy closure. Evidence for self-thinning obtained from the B. halimifolia population occuring within the younger pine stand provided an indication that the carrying capacity of the site was approached fairly early in the rotation.

scholarly journals STATISTICAL MODEL FOR THE RELATIONSHIP BETWEEN MAIZE KERNEL ORIENTATION AND SEED LEAF AZIMUTH

2015 ◽  
Vol 52 (3) ◽  
pp. 359-370
Author(s):  
ADRIAN KOLLER ◽  
GUILHERME TORRES ◽  
MICHAEL BUSER ◽  
RANDY TAYLOR ◽  
BILL RAUN ◽  
...  
Keyword(s):  
Simulation Models ◽  
Circular Statistics ◽  
Von Mises Distribution ◽  
Canopy Closure ◽  
Canopy Architecture ◽  
Maize Kernel ◽  
Angular Data ◽  
Significant Yield ◽  
Von Mises ◽  
The Relationship

SUMMARYHand-planted plots of across-row-oriented corn seeds (Zeamays L.) produce highly structured leaf canopies and have shown significant yield advantage over randomly planted plots in prior studies. For further investigation of the phenomenon by simulation, the objective of this study was to develop a probabilistic model for the correlation between seed orientation and initial plant orientation. In greenhouse trials, the azimuthal orientation of kernels of four different hybrids was recorded at planting. At collar setting of the seed leaf, the orientation of the seed leaf was determined and the angular data subjected to the analytical methods of circular statistics. The results indicate that the correlation between seed azimuth and seed leaf azimuth can be described by a von Mises distribution. The probabilistic seed to seed leaf azimuth model described herein may be implemented in simulation models to investigate the effect of canopy architecture, canopy closure and light interception efficiency of corn under conditions of seed oriented planting.

scholarly journals Structural, physiognomic and aboveground biomass variation in savanna-forest transition zones on three continents. How different are co-occurring savanna and forest formations?

2014 ◽  
Vol 11 (3) ◽  
pp. 4591-4636 ◽  
Author(s):  
E. M. Veenendaal ◽  
M. Torello-Raventos ◽  
T. R. Feldpausch ◽  
T. F. Domingues ◽  
F. Gerard ◽  
...  
Keyword(s):  
South America ◽  
Woody Plant ◽  
Canopy Cover ◽  
Woody Vegetation ◽  
Canopy Closure ◽  
Forest Transition ◽  
Vegetation Types ◽  
Forest Species ◽  
Stable States ◽  
Transition Zones

Abstract. Through interpretations of remote sensing data and/or theoretical propositions, the idea that forest and savanna represent "alternative stable states" is gaining increasing acceptance. Filling an observational gap, we present detailed stratified floristic and structural analyses for forest and savanna stands mostly located within zones of transition (where both vegetation types occur in close proximity) in Africa, South America and Australia. Woody plant leaf area index variation was related in a similar way to tree canopy cover for both savanna and forest with substantial overlap between the two vegetation types. As total woody plant canopy cover increased, so did the contribution of middle and lower strata of woody vegetation to this total. Herbaceous layer cover also declined as woody cover increased. This pattern of understorey grasses and herbs being progressively replaced by shrubs as canopy closure occurs was found for both savanna and forests and on all continents. Thus, once subordinate woody canopy layers are taken into account, a less marked transition in woody plant cover across the savanna-forest species discontinuum is observed compared to that implied when trees of a basal diameter > 0.1m are considered in isolation. This is especially the case for shrub-dominated savannas and in taller savannas approaching canopy closure. An increased contribution of forest species to the total subordinate cover is also observed as savanna stand canopy closure occurs. Despite similarities in canopy cover characteristics, woody vegetation in Africa and Australia attained greater heights and stored a greater concentration of above ground biomass than in South America. Up to three times as much aboveground biomass is stored in forests compared to savannas under equivalent climatic conditions. Savanna/forest transition zones were also found to typically occur at higher precipitation regimes for South America than for Africa. Nevertheless, coexistence was found to be confined to a well-defined edaphic/climate envelope consistent across all three continents with both soil and climate playing a role as the key determinants of the relative location of forest and savanna. Taken together these observations do not lend support the notion of alternate stable states mediated through fire-feedbacks as the prime force shaping the distribution of the two dominant vegetation types of the tropical lands.

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