THE LIFE-FORMS OF THE FLORA OF MOUNT YAMASKA, ROUVILLE COUNTY, QUEBEC

1963 ◽  
Vol 41 (10) ◽  
pp. 1425-1437 ◽  
Author(s):  
S. C. Fabius LeBlanc
Keyword(s):  
North America ◽  
Native Species ◽  
Life Form ◽  
Life Forms ◽  
Flowering Plants ◽  
Eastern North America

The life-forms of the flowering plants and vascular cryptogams of the flora of Mount Yamaska, Quebec, are listed according to the system developed by C. Raunkiaer. Four life-form spectra have been established. Spectra including vascular cryptogams do not vary significantly from those without vascular cryptogams; spectra including both naturalized and native species vary somewhat from those including native species only. The life-form spectrum of native and naturalized phanerogams is compared with similar spectra from other localities in eastern North America.

First Report of Powdery Mildew of Platanus occidentalis caused by Microsphaera platani (Erysiphe platani) in Washington State

2003 ◽  
Vol 4 (1) ◽  
pp. 33 ◽  
Author(s):  
Dean A. Glawe
Keyword(s):  
North America ◽  
Powdery Mildew ◽  
Native Species ◽  
Washington State ◽  
Eastern North America ◽  
First Report ◽  
Platanus Occidentalis

American sycamore (Platanus occidentalis L.) is a common native species in eastern North America and is planted widely as a landscape tree in other regions. During a survey of powdery mildew diseases in Washington State, the fungus Microsphaera platani Howe was found on American sycamore trees in Madison Park, Seattle. This report documents the presence of M. platani in Washington State and presents information on the fungus. Accepted for publication 30 July 2003. Published 18 August 2003.

A Student's Atlas of Flowering Plants: Some Dicotyledons of Eastern North America

Taxon ◽  
1975 ◽  
Vol 24 (4) ◽  
pp. 524
Author(s):  
R. S. Cowan ◽  
Carroll E. Wood
Keyword(s):  
North America ◽  
Flowering Plants ◽  
Eastern North America

scholarly journals Biodiversity conservation in cities: Defining habitat analogs for plant species of conservation interest

2019 ◽  
Author(s):  
M Itani ◽  
M. Al Zein ◽  
N. Nasralla ◽  
S. N. Talhouk
Keyword(s):  
Plant Species ◽  
Species Interactions ◽  
Native Species ◽  
Life Form ◽  
Landscape Management ◽  
Life Forms ◽  
Habitat Diversity ◽  
Green Spaces ◽  
Urban Habitat ◽  
Stepwise Method

AbstractUrban plant habitats have become primary drivers of species interactions. They consist of managed vegetation and spontaneous assemblages of native, naturalized, ornamental garden escapes, and invasive species. Our objective was to define urban habitat analogs for a plant species of conservation interest, Matthiola crassifolia, which has persisted in varying abundance in the Mediterranean city of Beirut.We adopted a stepwise method that integrates two vegetation assessments, floristics, and physiognomy. We placed seventy-eight quadrats (1m x 1m) in 12 study sites following a deliberate biased method to capture habitat diversity. In every quadrat, we performed taxonomic identification and recorded life form of each species. We pooled species that shared the same life form into categories and estimated area cover for each of these life forms. We performed TWINSPAN analysis on floristic data to identify species positively associated with M. crassifolia, and on life forms, to determine plant assemblages that promote optimal M. crassifolia representation. We then combined findings from both analyses to generate a description of urban habitat analogs suitable for M. crassifolia.The results revealed that urban habitat analogs favorable to M. crassifolia include green spaces dominated by palms, low-lying succulents, or by shrubs with scale-like leaves. On the other hand, spaces dominated by turf grass, canopy trees, or vegetation that produces significant litter were not favorable to M. crassifolia’s persistence. Based on these findings, we generated a plant palette of native and non-native species to design urban habitat analogs favorable to the persistence of M. crassifolia.Synthesis and applicationsThe application of this method can inform planting designs that yield suitable habitats for plants of conservation interest. It can also guide landscape management plans that seek to create or modify green spaces to optimize growing conditions for species of conservation interest. Depending on sites, and based on the information generated by the stepwise method, designers and managers may decide to exclude life forms of native or non-native species that do not support the growth of a species of conservation interest, or they may create an artificial habitat that is conducive to its persistence.

scholarly journals Patterns in the alien flora of the Democratic Republic of the Congo: a comparison of Asteraceae and Fabaceae

2020 ◽  
Vol 153 (3) ◽  
pp. 373-389
Author(s):  
Farzaneh Bordbar ◽  
Pierre Meerts
Keyword(s):  
Alien Species ◽  
Native Species ◽  
Life Form ◽  
Democratic Republic ◽  
Geographic Origin ◽  
Life Forms ◽  
Trait Divergence ◽  
Native Flora ◽  
Alien Flora ◽  
Republic Of The Congo

Background and aims – This work provides the first pattern analysis of the alien flora of the Democratic Republic of the Congo (D.R. Congo), using Asteraceae and Fabaceae as a case study. Methods – Based on herbarium collections, existing databases, and literature data, a database of 38 alien species of Asteraceae and 79 alien species of Fabaceae has been assembled. Patterns in the introduction pathway, phylogeny, life form, morpho-functional traits, geographic origin, and occurrence in D.R. Congo are explored. Key results – America is the main source continent in both families, but Asia is also an important donor of Fabaceae. Taxonomic spectrum discrepancies between the alien and the native flora reflect the continent of origin. Sixty-six percent of alien Asteraceae have been accidentally introduced, most of which being annual weeds of disturbed soil. In contrast, 90% of alien Fabaceae have been deliberately introduced for forestry, agriculture, or environmental purposes, most of which being phanerophytes. Traits were compared between pairs of congeneric alien and native species. For Asteraceae, a sharp discrepancy was found in the life form spectrum (aliens: mostly therophytes; natives: phanerophytes). For Fabaceae, alien species had larger leaves and larger pods compared to their native congeners. The number of specimens in collections was positively correlated with the time since the date of first collection for both families. The Guineo-Congolian region has the highest number of alien Fabaceae, while alien Asteraceae are overrepresented in the Zambezian region.Conclusions – Contrasting patterns between alien Asteraceae and Fabaceae in the flora of D.R. Congo in terms of life forms, trait divergence compared to the native flora, and occurrence, reflect the divergent biological attributes and relations to humans of the two families. The striking discrepancies between the two families call for analyses of patterns of alien flora at family level and warn against global generalisations.

Interactions between Callitris above-ground biomass, species density and plant form in north-eastern New South Wales

2013 ◽  
Vol 61 (1) ◽  
pp. 73 ◽  
Author(s):  
John T. Hunter
Keyword(s):  
Native Species ◽  
Life Form ◽  
Soil Depth ◽  
Life Forms ◽  
Species Density ◽  
Above Ground Biomass ◽  
Ground Biomass ◽  
Local Species Richness ◽  
Reserve Network ◽  
Cypress Pine

Dense Callitris endlicheri (Parl.) F.M.Bailey (black cypress pine) and C. glaucophylla Joy Thomps. & L.A.S.Johnson (white cypress pine) stands are often viewed as problematic and thinning is often encouraged from a biodiversity perspective. In the present investigation, canonical correspondence analyses (CCAs) of 997 survey sites were undertaken within the public and private reserve network that contains a variety of above-ground biomass (AGB) of C. endlicheri and C. glaucophylla (as measured by diameter at breast height (DBH) and dispersion) and the evenness of the species distribution was undertaken. This was done to further dissect the effect of Callitris AGB on species density (richness per quadrat) of native and introduced species and on broad life-form groupings. Other landscape features such as altitude, physiography, drainage and soil depth were also included in analyses. C. endlicheri and C. glaucophylla grow in different biophysical locations in most instances and this was reflected in the results of the study. No level of AGB or clumping of C. endlicheri was found to affect species density of native or introduced taxa or the distribution of life-forms. Increasing AGB of C. glaucophylla had a positive effect on native species density. The species density of introduced taxa was also increased with an increase in C. glaucophylla AGB. The distribution of life-forms was significantly affected by an increase in Callitris AGB with a decrease in trees, shrubby taxa and hemi-parasites, although herbaceous species had a concomitant increase in number. There is no reason to thin dense Callitris stands to increase local species richness. However, because the distribution of life-form types is significantly affected by C. glaucophylla, there is a need to understand what is occurring in species replacements and what landscape mosaic of structural types is required for this species. It is likely that dense stands of Callitris are important, along with a variety of stand densities so as to maintain the highest regional diversity.

Declining Native Species Richness in Natural Areas in Eastern North America: An Example from Baker Woodlot in Central Michigan

Rhodora ◽  
10.3119/20-13 ◽  
2021 ◽  
Vol 122 (991) ◽  
Author(s):  
Matthew R. Kolp ◽  
Matthew T. Chansler ◽  
Garrett E. Crow ◽  
L. Alan Prather
Keyword(s):  
Species Richness ◽  
North America ◽  
Native Species ◽  
Eastern North America ◽  
Natural Areas ◽  
Native Species Richness

The Identification and Study of Indian Shell Middens in Eastern North America: 1643–1861

1986 ◽  
Vol 6 (3) ◽  
pp. 227-243 ◽  
Author(s):  
Andrew L. Christenson
Keyword(s):  
Nineteenth Century ◽  
Civil War ◽  
North America ◽  
East Coast ◽  
Eastern North America ◽  
Shell Midden ◽  
Shell Middens ◽  
Work Done

Although the interest in shell middens in North America is often traced to reports of the discoveries in Danish kjoekkenmoeddings in the mid-nineteenth century, extensive shell midden studies were already occurring on the East Coast by that time. This article reviews selected examples of this early work done by geologists and naturalists, which served as a foundation for shell midden studies by archaeologists after the Civil War.

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