scholarly journals Recording plant status and regeneration during single visits

2019 ◽  
Vol 1 (4) ◽  
pp. 283-291
Author(s):  
Kevin J. Walker ◽  
Simon Leach ◽  
Chris Preston ◽  
Thomas Humphrey ◽  
Trevor James ◽  
...  
Keyword(s):  
Plant Species ◽  
Native Species ◽  
Objective Measure ◽  
The Other ◽  
A Site

Information on the origin (status) and regeneration of plant species improves our understanding of native distributions and the establishment of non-native species. However, current categories used to record status in Britain and Ireland, whilst conceptually informative, rely on a knowledge of persistence that is impossible to assess objectively during a single (one-off) recording visit. We propose five alternative categories that focus on origin (how a species arrived at a site) rather than persistence. The first two categories apply to nationally native taxa: (1) populations that are unequivocally native and (2) those that are likely to have been introduced and/or are spreading for reasons that are obscure. The other three categories cover the occurrences of any taxon, native or non-native, that is known or suspected to have been introduced to a site: (3) introductions with unknown/obscure origins; (4) deliberate introductions; and (5) accidental introductions. For the introduced categories 3-5 we recommend that botanists also record signs of regeneration, i.e. seedlings or widely scattered patches, as a more objective measure whether a species is likely to be self-sustaining in a given locality.

Trends in vegetation cover in the grassland community on the Bogong High Plains, Victoria.

1985 ◽  
Vol 7 (2) ◽  
pp. 93 ◽  
Author(s):  
Rees H van ◽  
WA Papst ◽  
K McDougall ◽  
RC Boston
Keyword(s):  
Species Composition ◽  
Plant Species ◽  
Vegetation Cover ◽  
The Other ◽  
Alpine Grassland ◽  
High Plains ◽  
Grassland Community ◽  
Major Species ◽  
A Site ◽  
Free Ranging

Cover and luxuriance of plant species in the alpine grassland community were measured. Four grassland sites were monitored regularly from 1979 to 1984; three are grazed during summer months by free-ranging cattle, the other has not been grazed since 1974. Data are presented for cover of major species at another grazed site monitored since 1947. Three classes of total vegetation cover were defined in relation to the susceptibility of a site toerosion. Results show that there have been no trends in vegetation cover and luxuriance. Species composition and total vegetation cover varied between sites but there were no dis- cernible trends in these characteristics.

Ice-free area expansion compounds the non-native species threat to Antarctic terrestrial biodiversity

2019 ◽  
Author(s):  
Grant Duffy ◽  
Jasmine R Lee
Keyword(s):  
Human Activity ◽  
Native Species ◽  
Climate Scenario ◽  
Climatic Environment ◽  
Species Establishment ◽  
Suitable Habitats ◽  
Terrestrial Biodiversity ◽  
A Site ◽  
Area Expansion ◽  
Free Area

Warming across ice-covered regions will result in changes to both the physical and climatic environment, revealing new ice-free habitat and new climatically suitable habitats for non-native species establishment. Recent studies have independently quantified each of these aspects in Antarctica, where ice-free areas form crucial habitat for the majority of terrestrial biodiversity. Here we synthesise projections of Antarctic ice-free area expansion, recent spatial predictions of non-native species risk, and the frequency of human activities to quantify how these facets of anthropogenic change may interact now and in the future. Under a high-emissions future climate scenario, over a quarter of ice-free area and over 80 % of the ~14 thousand km2 of newly uncovered ice-free area could be vulnerable to invasion by one or more of the modelled non-native species by the end of the century. Ice-free areas identified as vulnerable to non-native species establishment were significantly closer to human activity than unsuitable areas were. Furthermore, almost half of the new vulnerable ice-free area is within 20 km of a site of current human activity. The Antarctic Peninsula, where human activity is heavily concentrated, will be at particular risk. The implications of this for conservation values of Antarctica and the management efforts required to mitigate against it are in need of urgent consideration.

Actualisation du catalogue des pteridophytes du Nord Ouest Algerien (region de Tlemcen). An update of the cheklist of pteridophytes from Nordwest Algeria (Tlemcen region)

2013 ◽  
Vol 38 ◽  
pp. 33-39 ◽  
Author(s):  
Boumediene Medjahdi ◽  
Assia Ltreuch-Belarouci ◽  
Rémy Prelli
Keyword(s):  
Nous Avons ◽  
Genetic Resources ◽  
Threatened Species ◽  
The Other ◽  
Natural Distribution ◽  
Ecological Characteristics ◽  
Statutory Protection ◽  
Ouest Algérien ◽  
A Site ◽  
Ressources Génétiques

Français. Un inventaire des ptéridophytes a été entrepris dans les forêts de la région de Tlemcen. L’inventaire de ces populations constitue une étape importante pour le développement des stratégies de conservation des ressources génétiques et de la diversité de ces populations sur l’ensemble de leur aire de distribution naturelle. Nous avons ainsi effectué le recensement et l’identification des fougères existantes dans la région de Tlemcen. Au total, plusieurs stations dont les caractéristiques écologiques diffèrent d’un site à un autre ont été prospectées, cela a permis l’identification de 26 taxons (dont 5 exceptionnellement rare). La création de réserves naturelles forestières renforcée par une protection réglementaire des espèces les plus menacées est nécessaire pour le maintien de ces communautés si particulières. English. An inventory of Pteridophyta was begun in the forests of the Tlemcen region. The inventory of these populations constitutes an important stage for the developement of the strategies of preservation of the genetic resources and the diversity of these populations on their whole area of natural distribution. We so made the inventory and the identification of the existing ferns in the region of Tlemcen. On the whole, several stations the ecological characteristics differ from a site in the other one were canvassed; they allowed the identification of 26 taxes (among which 5 exceptionally rare). The creation of forest nature reserves strengthened by a statutory protection of the most threatened species is necessary for the preservation of these particular communities.

scholarly journals Phytoremediation Potential of Native Herbaceous Plant Species Growing on a Paradigmatic Brownfield Site

2021 ◽  
Vol 232 (7) ◽  
Author(s):  
N. Matanzas ◽  
E. Afif ◽  
T. E. Díaz ◽  
J. R. Gallego
Keyword(s):  
Plant Species ◽  
Contaminated Soils ◽  
Native Species ◽  
Low Cost ◽  
Plantago Lanceolata ◽  
Herbaceous Plant ◽  
Plant Interactions ◽  
Aerial Parts ◽  
Medicago Lupulina ◽  
Icp Ms

AbstractPhytomanagement techniques using native species allow the recovery of contaminated soils at low cost and circumvent the ecological risks associated with the use of non-native species. In this context, a paradigmatic brownfield megasite highly contaminated by As and Pb was sampled in order to analyze soil–plant interactions and identify plant species with phytoremediation potential. A survey was first carried out in a 20-ha area to obtain an inventory of species growing spontaneously throughout the site. We then performed another survey in the most polluted sub-area (1 ha) within the site. Pseudototal concentrations of contaminants in the soil, aerial parts of the plants, and roots were measured by ICP-MS. A detailed habitat classification was done, and a specific index of coverage was applied by means of a 1-year quadrat study in various sampling stations. Results converged in the selection of six herbaceous species (Dysphania botrys, Lotus corniculatus, Lotus hispidus, Plantago lanceolata, Trifolium repens, Medicago lupulina). All of these plants are fast-growing, thereby making them suitable for use in phytostabilization strategies. Furthermore, they are all easy to grow and propagate and are generally self-sustaining. All six plants showed accumulation factors below 1, thus revealing them as pseudomethallophytes and excluders. However, L. hispidus and M. lupulina showed translocation capacity and are considered worthy of further study.

scholarly journals Hosts of Raoiella indica Hirst (Acari: Tenuipalpidae) Native to the Brazilian Amazon

2017 ◽  
Vol 9 (4) ◽  
pp. 86 ◽  
Author(s):  
Cristina A. Gómez-Moya ◽  
Talita P. S. Lima ◽  
Elisângela G. F. Morais ◽  
Manoel G. C. Gondim Jr. ◽  
Gilberto J. De Moraes
Keyword(s):  
Plant Species ◽  
Native Species ◽  
Brazilian Amazon ◽  
Intrinsic Rate Of Increase ◽  
Native Plant ◽  
Instantaneous Rate ◽  
Net Reproductive Rate ◽  
Musa Paradisiaca ◽  
Rate Of Increase ◽  
Raoiella Indica

The expansion of red palm mite (RPM), Raoiella indica (Acari: Tenuipalpidae) in Brazil could impact negatively the native plant species, especially of the family Arecaceae. To determine which species could be at risk, we investigated the development and reproductive potential of R. indica on 19 plant species including 13 native species to the Brazilian Amazon (12 Arecaceae and one Heliconiaceae), and six exotic species, four Arecaceae, a Musaceae and a Zingiberaceae. Values of the instantaneous rate of increase (ri) were initially estimated at 7, 14, 21 and 28 days after infestation of each species. Higher values of ri (> 0.05) were determined on the Arecaceae Adonidia merrillii, Astrocaryum jauari, Cocos nucifera, Bactris simplicifrons, Mauritia flexuosa, Phoenix dactylifera and Socratea exorrhiza, and on the Heliconiaceae Heliconia psittacorum Sassy; these were classified as “potential primary hosts”. Lower, but still positive values of ri (0-0.05) were determined on the Arecaceae Bactris maraja, Oenocarpus bacaba, Oenocarpus bataua and on the Musaceae Musa × paradisiaca (Prata variety); these were classified as “potential secondary hosts”. Negative values of ri were determined for the remaining plants, i.e., the Arecaceae Astrocaryum aculeatum, Attalea maripa, Bactris gasipaes, Elaeis guineensis, Euterpe oleracea, Euterpe precatoria, and the Zingiberaceae Alpinia rosea; these were considered “non-hosts”. Species with ri < 0.05 were considered not to be threatened by the RPM. Biological parameters of RPM were evaluated on the plant species with positive ri (except B. maraja) and two native species with negative ri (E. oleracea and E. precatoria). Mean developmental time ranged from 14.7 days on C. nucifera to 21.4 days on Musa × paradisiaca, showing a significant influence of the plant substrate. Immature viability, oviposition rate, net reproductive rate (R0) and intrinsic rate of increase (rm) were affected by the plant species.

scholarly journals β-Li0.37Na0.63Fe(MoO4)2

2014 ◽  
Vol 70 (2) ◽  
pp. i9-i10 ◽  
Author(s):  
Amira Souilem ◽  
Mohamed Faouzi Zid ◽  
Ahmed Driss
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Solid State Reaction ◽  
Title Compound ◽  
General Position ◽  
Site Occupancy ◽  
The Other ◽  
Main Structure ◽  
Axis Direction ◽  
A Site

The title compound, lithium/sodium iron(III) bis[orthomolybdate(VI)], was obtained by a solid-state reaction. The main structure units are an FeO6octahedron, a distorted MoO6octahedron and an MoO4tetrahedron sharing corners. The crystal structure is composed of infinite double MoFeO11chains along theb-axis direction linked by corner-sharing to MoO4tetrahedra so as to form Fe2Mo3O19ribbons. The cohesion between ribbonsviamixed Mo—O—Fe bridges leads to layers arranged parallel to thebcplane. Adjacent layers are linked by corners shared between MoO4tetrahedra of one layer and FeO6octahedra of the other layer. The Na+and Li+ions partially occupy the same general position, with a site-occupancy ratio of 0.631 (9):0.369 (1). A comparison is made withAFe(MoO4)2(A= Li, Na, K and Cs) structures.

scholarly journals THE GRASS IS ALWAYS GREENER ON THE OTHER SIDE OF THE FENCE: THE FLORA IN URBAN BACKYARDS OF DIFFERENT SOCIAL CLASSES

2017 ◽  
Vol 20 (1) ◽  
pp. 1-20 ◽  
Author(s):  
FABIO ANGEOLETTO ◽  
JUAN PEDRO RUIZ SANZ ◽  
RICARDO MASSULO ALBERTIN ◽  
FREDERICO FONSECA DA SILVA
Keyword(s):  
Biodiversity Conservation ◽  
Plant Species ◽  
Plant Diversity ◽  
The Other ◽  
Social Classes ◽  
Metropolitan Region ◽  
Woody Vegetation ◽  
Endangered Plant ◽  
Diversity Patterns ◽  
Flora Diversity

Abstract Home gardens have considerable biodiversity conservation potential. However, these spaces are unplanned, and there is little information about the flora diversity in the backyards of different social classes. The current study has quantified and compared plant diversity in the backyards of two neighborhoods located in the metropolitan region of Maringá - RMM (Paraná, Brazil), namely, Conjunto Triangulo and Zona 02. The diversity patterns were markedly different when the neighborhoods were compared. Therefore the present study has set some planning guidelines aiming at increasing the presence of woody vegetation, as well as at contributing to biodiversity conservation, including the conservation of endangered plant species, in the backyards of the RMM.

scholarly journals Genomic Considerations for the Modification of Saccharomyces cerevisiae for Biofuel and Metabolite Biosynthesis

2020 ◽  
Vol 8 (3) ◽  
pp. 321 ◽  
Author(s):  
James T. Arnone
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Native Species ◽  
Genetic Manipulation ◽  
Scale Up ◽  
Biosynthetic Pathways ◽  
Yeast Saccharomyces Cerevisiae ◽  
Position Effects ◽  
Industrial Use ◽  
A Site ◽  
Global Population

The growing global population and developing world has put a strain on non-renewable natural resources, such as fuels. The shift to renewable sources will, thus, help meet demands, often through the modification of existing biosynthetic pathways or the introduction of novel pathways into non-native species. There are several useful biosynthetic pathways endogenous to organisms that are not conducive for the scale-up necessary for industrial use. The use of genetic and synthetic biological approaches to engineer these pathways in non-native organisms can help ameliorate these challenges. The budding yeast Saccharomyces cerevisiae offers several advantages for genetic engineering for this purpose due to its widespread use as a model system studied by many researchers. The focus of this review is to present a primer on understanding genomic considerations prior to genetic modification and manipulation of S. cerevisiae. The choice of a site for genetic manipulation can have broad implications on transcription throughout a region and this review will present the current understanding of position effects on transcription.

Completing a Site: The Other 90%

2011 ◽  
pp. 747-802
Author(s):  
Benjamin Melançon
Keyword(s):  
The Other ◽  
A Site

scholarly journals Continuity through Renewal: John Dewey, the International Institute in Spain, and Resisting the Assault on the Humanities

2020 ◽  
Vol 2 (1) ◽  
pp. 23-38
Author(s):  
Andrew Bennett
Keyword(s):  
Civil War ◽  
Educational Reform ◽  
John Dewey ◽  
Liberal Democracy ◽  
The Other ◽  
International Institute ◽  
Humanities Education ◽  
Shared Space ◽  
Democratic Societies ◽  
A Site

This paper marks the relation between humanities education and democracy as one of mutual necessity, since the pragmatic value of each is dependent on the other to be recognizable and realizable. Such an understanding is drawn from the ideas of the American philosopher and educator John Dewey. Dewey’s system clearly reveals the nature of the stakes of the assault on the humanities; it also indicates the educational measures democratic societies should take in response. By instantiating the “conjoint communicated experience” of democracy in a public, shared space in which differences are respected, human meanings are explored, and the expansion of knowledge and experience is valued as an end in itself, the humanities classroom emerges as a site of social renewal, as well as one of resistance to illiberalism. In order to present such a site in a manner befitting Dewey’s pragmatism, a lesser-known, local example of the value of humanities education is examined in this paper: that of the International Institute in Spain, located in Madrid. Beginning with its founding as a school for girls by Boston missionaries in 1892, and through its role at the center of a network of institutions invested in progressive educational reform in Spain during the pre-civil war period, IIE stands as a testament to the continuity through renewal that defines both liberal democracy and humanities education.

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