scholarly journals Expression of functional traits during seedling establishment in two populations of Pinus ponderosa from contrasting climates

2015 ◽  
Vol 35 (5) ◽  
pp. 535-548 ◽  
Author(s):  
K. L. Kerr ◽  
F. C. Meinzer ◽  
K. A. McCulloh ◽  
D. R. Woodruff ◽  
D. E. Marias
Keyword(s):  
Functional Traits ◽  
Pinus Ponderosa ◽  
Seedling Establishment ◽  
Two Populations

The effect of population structure on growth patterns in the woody goldenrod Solidago pauciflosculosa

1983 ◽  
Vol 61 (7) ◽  
pp. 1955-1958 ◽  
Author(s):  
Marvin P. Pritts ◽  
James F. Hancock
Keyword(s):  
Population Structure ◽  
Seedling Establishment ◽  
Reproductive Output ◽  
Plant Biomass ◽  
Growth Patterns ◽  
Dispersion Pattern ◽  
Allocation Patterns ◽  
Total Plant Biomass ◽  
Total Plant ◽  
Two Populations

The population structure and growth patterns of two populations of Solidago pauciflosculosa, a woody goldenrod, were investigated. Populations consisted of even-aged contagious patches of individuals, a dispersion pattern likely caused by the periodic appearance of microsites suitable for seedling establishment. The density of individuals within the even-aged clumps varied considerably and was correlated with total plant biomass and reproductive output. Density was not correlated with either reproductive or nonreproductive allocation patterns.

scholarly journals Functional Traits of Pinus ponderosa Coarse Roots in Response to Slope Conditions

2019 ◽  
Vol 10 ◽  
Author(s):  
R. Kasten Dumroese ◽  
Mattia Terzaghi ◽  
Donato Chiatante ◽  
Gabriella S. Scippa ◽  
Bruno Lasserre ◽  
...  
Keyword(s):  
Functional Traits ◽  
Pinus Ponderosa ◽  
Coarse Roots

scholarly journals Pinus ponderosa Seedling Establishment and the Influence of Competition with the Bunchgrass Agropyron spicatum

1996 ◽  
Vol 157 (4) ◽  
pp. 509-515 ◽  
Author(s):  
Peter F. Kolb ◽  
Ronald Robberecht
Keyword(s):  
Pinus Ponderosa ◽  
Seedling Establishment ◽  
Agropyron Spicatum

scholarly journals Ponderosa Pine and Lodgepole Pine Growth Response to One-Time Application of Herbicide During Seedling Establishment in Western Montana

2003 ◽  
Vol 18 (3) ◽  
pp. 149-154 ◽  
Author(s):  
Chad E. Keyser ◽  
Kelsey S. Milner
Keyword(s):  
Pinus Ponderosa ◽  
Ponderosa Pine ◽  
Seedling Establishment ◽  
Pinus Contorta ◽  
Lodgepole Pine ◽  
Tree Height ◽  
Height Growth ◽  
Western Montana ◽  
Growth Effect ◽  
Percent Cover

Abstract This study examined long-term diameter and height response of ponderosa pine (Pinus ponderosa) and lodgepole pine (Pinus contorta var. latifolia) to a one-time application of herbicide during seedling establishment in western Montana. Two herbicide trials initiated in 1981 and 1983 by Champion International Corporation were resurrected during the summer of 1997. Analysis of variance (ANOVA) F-tests along with Duncan's Multiple Range tests (DMR) were performed on mean tree dbh, tree height, and competing vegetation percent cover estimates. In addition, a graphical analysis of mean annual height growth over time was performed. Significant increases (alpha = 0.05) in ponderosa pine dbh (25 to 44%) and height (11 to 28%) were found after 16 yr of growth on Velpar L. (hexazinone) treated plots, while lodgepole pine had significant increases in dbh (70 to 118%) and height (41 to 82%) after 15 yr of growth on Velpar L. treated plots. Graphical analyses indicated a positive height growth effect for a period of 11 to 13 yr following treatment for ponderosa pine; however, total height gains had decreased in recent years. Positive increases in height growth for lodgepole pine were continuing after 15 yr of growth. These results indicate that a one-time application of herbicide applied during seedling establishment will promote faster tree growth in western Montana. We also note that proper density management will be necessary early in the life of the stand to maintain height gains. West. J. Appl. For. 18(3):149–154.

A study of functional traits reveals serpentinomorphoses and new taxa in populations of Mediterranean Genista (Fabaceae)

Phytotaxa ◽  
2019 ◽  
Vol 394 (4) ◽  
pp. 244
Author(s):  
NOELIA HIDALGO-TRIANA ◽  
ANDRÉS V. PÉREZ-LATORRE
Keyword(s):  
Functional Traits ◽  
Aerial Part ◽  
Western Mediterranean ◽  
New Taxon ◽  
New Variety ◽  
Crown Diameter ◽  
Quantitative And Qualitative Traits ◽  
Branch Type ◽  
Vegetative Phases ◽  
Two Populations

In this work we try to determine whether the modifications in the functional traits of a plant species, both morphological and phenological, and caused by the adaptive serpentinomorphoses syndrome are enough to differentiate a new taxon. For this purpose, Genista hirsuta subsp. lanuginosa, a western Mediterranean serpentinophyte (subserpentinophyte) with populations both on serpentines and outside them was selected. The study of functional types (functional traits, which link morphology with adaptations, and phenological reproductive and vegetative phases) was performed in both populations. The results showed that there were statistically significant differences between the two types of populations (serpentine and non-serpentine) with respect to some of the quantitative functional characters studied (plant height, crown diameter, Specific leaf area (SLA), and length of photosynthetic stems). Moreover, other differences were detected with respect to semi-quantitative and qualitative traits: location of renewal buds, branch type, morphology of aerial part, bark consistency, leaf tomentosity, morphology of the root system, and organ redness. Some of them are consistent with serpentinomorphoses syndrome, such as the existence of dwarfism (height of plants), cushion habit, macro-rooted plants and lower SLA (stenophylly) in serpentine populations, besides the presence of redness, which could be a character also linked to serpentinomorphoses. However, neither glaucescent organs nor glabrescence were observed (on the contrary, there is a greater general tomentosity in the plants of the serpentine population). In addition, phenological differences were detected, consisting of a generalized shortening of the phenophases and a certain delay in the reproductive phenophases in the serpentine populations, a characteristic trait in serpentine flora, and differences in sequencing phenophases. These facts lead to propose the use of phenology, in combination with functional traits, to detect serpentinomorphoses syndrome. The detected differences are enough to separate taxonomically the two populations of Genista hirsuta subsp. lanuginosa, proposing for the non-serpentine populations a new variety: var. silicicola nov.

Comparison of Principal Component Solutions in Two Populations

Methodology ◽  
2016 ◽  
Vol 12 (1) ◽  
pp. 11-20 ◽  
Author(s):  
Gregor Sočan
Keyword(s):  
Simulation Study ◽  
Principal Components ◽  
Common Factor ◽  
Principal Component ◽  
Component Model ◽  
Bootstrap Procedure ◽  
Factor Loadings ◽  
Component Loadings ◽  
Principal Component Model ◽  
Two Populations

Abstract. When principal component solutions are compared across two groups, a question arises whether the extracted components have the same interpretation in both populations. The problem can be approached by testing null hypotheses stating that the congruence coefficients between pairs of vectors of component loadings are equal to 1. Chan, Leung, Chan, Ho, and Yung (1999) proposed a bootstrap procedure for testing the hypothesis of perfect congruence between vectors of common factor loadings. We demonstrate that the procedure by Chan et al. is both theoretically and empirically inadequate for the application on principal components. We propose a modification of their procedure, which constructs the resampling space according to the characteristics of the principal component model. The results of a simulation study show satisfactory empirical properties of the modified procedure.

The effect of handling on the yield of two populations of Lolium perenne selected for differences in mature leaf respiration rate

1993 ◽  
Vol 89 (2) ◽  
pp. 341-346 ◽  
Author(s):  
Edwin Kraus ◽  
Hans Lambers ◽  
Chris Kolloffel
Keyword(s):  
Respiration Rate ◽  
Lolium Perenne ◽  
Mature Leaf ◽  
Leaf Respiration ◽  
Two Populations

Molecular phylogeny and taxonomic evaluation of the genus Asaccus Dixon and Anderson, 1973 (Reptilia: Phyllodactylidae) in Iran

2020 ◽  
pp. 207-214
Author(s):  
Akbar Fattahi
Keyword(s):  
Molecular Phylogeny ◽  
Nuclear Gene ◽  
Genetic Distances ◽  
Genetic Lineage ◽  
New Taxon ◽  
Zagros Mountains ◽  
Relict Species ◽  
Taxonomical Revision ◽  
Two Populations ◽  
Taxonomic Evaluation

The Iranian species of the phyllodactylid geckos of the genus Asaccus are found only in the valleys of the Zagros Mountains, a region which represents an important area of endemism in western Iran. Recently, many relict species have been described from the central and southern parts of the Zagros Mountains, which were previously known as A. elisae. The recent descriptions of species within this complex suggest that diversity within the genus may be higher than expected and that its taxonomy and systematics should be revised. In the present study, phylogenetic relationships within the genus Asaccus were evaluated using two mitochondrial and one nuclear gene. Genetically, the genus shows high levels of variability. The molecular phylogeny of the genus suggests the presence of three main clades along the Zagros Mountains with the southern population (from the Hormozgan province) and one clade (A. sp8 and A. sp9) being sister taxon to A. montanus from UAE. The remaining samples are separated into two reciprocally monophyletic groups: the northern (Kurdistan, Kermanshah and Ilam provinces) and the central (Lorestan, Khuzestan, Kohgilouye-Bouyer Ahmad and Fars provinces) Zagros groups. The results of the present study suggest that populations attributed to A. elisae in Iran correspond to distinct lineages with high genetic distances. In brief, our results suggest that the genus needs a major taxonomical revision The Arabian origin of the genus has not been confirmed, because two populations from Zagros were located within the A. montanus, A. gallagheri and A. platyrhynchus clade. Further morphological analyses are needed to systematically define each genetic lineage as a new taxon.

Sign in / Sign up

Export Citation Format

Share Document