Plant extinction

Ebook "Endemism in vascular plants (Plant and vegetation, Volume 9)" is the first comprehensive analysis of the macroecology and geobotany of endemic vascular plants with case-studies and analyses from different regions in the world. Endemism is a pre-extinction phenomenon. Endemics are threatened with extinction. Due to international nature conservation policies and due to the perception of the public the concept’s importance is increasing. Endemism can result from different biological and environmental processes.

354p manmanthanhla0201 26-02-2024 2 1   Download

Ebook "Plant disease epidemiology: Facing challenges of the 21st Century" provides an overview of some of the latest research in plant disease epidemiology from researchers at the cutting edge of this important discipline. Plant disease epidemiologists have a strong scientific tradition in studying climate-pathogen-disease relationships. Biodiversity is also of global concern. The decline of global biodiversity that is currently taking place has been referred to as the sixth great extinction process our planet has experienced during its history, but this time, it is man-made.

137p tachieuhoa 28-01-2024 3 2   Download

This paper presents a deep learning model to address the problem of recognition of animals and plants. The context of this work is to make an effort in protection of rare species that are seriously faced to the risk of extinction in Vietnam such as Panthera pardus, Dalbergia cochinchinensis, Macaca mulatta.

15p vimulcahy 18-09-2023 9 4   Download

Turkey is one of the most important temperate countries on Earth in terms of plant diversity. There is a growing interest in understanding habitat suitability and future distributions of species in the scientific world. Because climate change has impacted ecosystems with major consequences, species are shifting and declining much faster than in the past. Some global climate models used for predicting climate in the future better represent and have higher reliability for some climate types. Ferulago glareosa, which lives in Turkey, is a rare endemic plant species.

14p tudichquannguyet 29-11-2021 8 1   Download

Dorystaechas hastata is a relict endemic medicinal and aromatic plant under risk of extinction. Assessment of genetic diversity and association between geographic distribution and genetic variation could benefit to the conservation efforts. The objectives of this study were to assess genetic diversity and population differentiation of the species in its natural habitat.

18p tudichquannguyet 29-11-2021 11 1   Download

In the past several millenniums, we have domesticated several crop species that are crucial for human civilization, which is a symbol of significant human influence on plant evolution. A pressing question to address is if plant diversity will increase or decrease in this warming world since contradictory pieces of evidence exit of accelerating plant speciation and plant extinction in the Anthropocene.

11p vijichea2711 28-05-2021 20 1   Download

Paphiopedilum orchids, the most popular and rare orchid genera, are used as potted flowers and cut flowers. In nature condition, the orchid population is threatened with extinction due to over-exploitation and altered habitat. Reduction in this orchids via large-scale micropropagation is a better option to reduce the wild harvest, meets the commercial needs as well as conserves this threatened orchid. This orchid can be propagated by germinating seeds under in vitro culture condition; however, they are difficult for micropropagation, especially regenerating plantlets from in vitro culture.

9p nguyenxuankha_bevandan 14-08-2020 13 1   Download

Efforts towards species conservation are focused on declining populations with less emphasis on dominant species. This has resulted to a once dominant species in forest ecosystem becoming endangered or at the verge of extinction. The study examined woody plants composition and stand structure of Detarium woodland to ascertain the conservation need of the species and other woody plants in Pandam wildlife Park, Plateau State, Nigeria. Four sample plots (250x10m each) were randomly established across the Daterium woodland.

8p gaocaolon5 14-06-2020 10 1   Download

Lecture 3 - Populations and ecosystems. During this unit, Student Teachers will: investigate the interdependence of living things (including humans) in an ecosystem, investigate how changes in environments affect plants and animals (including humans), explain how adaptive characteristics of a species affect its chance for survival or possible extinction,...

11p nanhankhuoctai2 25-05-2020 13 1   Download

Indigenous knowledge (IK), which is variously referred to as ‘traditional knowledge’, ‘local knowledge’, ‘folk knowledge’ etc., refers to that body of knowledge developed by local and indigenous communities over time in response to the needs of their specific local environment. This indigenous knowledge is really important in conserving the biological resources existing in different altitudinal and climatic variations. The indigenous communities of Kanyakumari use thirty plant species belonging to 29 genera and 22 families specifically in the treatment of various skin diseases viz.

10p chauchaungayxua3 07-02-2020 17 1   Download

Coscinium fenestratum (Gaertn.) Colebr, a important medicinal vine is considered as critically endangered or restricted to the humus rich soil. It has abundant use in ayurvedic, siddha, tibetan medicine system. The plant is already Red listed and at the verge of extinction. So a transcriptome study and the GC analysis of the plant are vital. The research provides information on its transcriptome and its stability which can be used for further studies. The leaf tissue of C.fenestratum was collected, sequenced using illumina paired end sequencing.

5p cothumenhmong1 10-12-2019 23 0   Download

Swertia chirayita (family Gentianaceae), imperative medicinal plant in Indian system of medicine known for its bitter principles. However, due to its high demand and scarcity due to its extinction, it is being frequently adulterated with other species of Swertia which are more readily available. At present the similar species of Swertia are marketed as „chirayita‟ which is affecting the potency of the drug.

14p cothumenhmong1 08-12-2019 23 1   Download

Huperzia serrata is a precious medicinal plant used in medicine to support and treat Alzheimer's disease. Currently, this species is in danger of extinction due to indiscriminate exploitation for commercial purposes. Furthermore, this species reproduces slowly and is difficult to cultivate artificially.

7p viaphrodite2711 15-10-2019 25 1   Download

Orchids are considered recalcitrant plants in in vitro propagation. Due to the lack of appropriate micropropagation techniques for mass production and damage to their ecological distribution posed by local gatherers, these species are threatened with extinction, including Serapias vomeracea (Burm.f.) Briq.

11p vikimsa 22-02-2019 20 1   Download

Salvia tomentosa is a common medicinal plant, and it is consumed as an herbal tea in some Mediterranean countries. It has been extensively collected from its natural habitat, and careless collection has caused the recent extinction of some plants. The present study was undertaken to cultivate S. tomentosa and compare the phenolic composition and antioxidant properties of wild and cultivated plants.

7p vimb123 11-01-2019 20 2   Download

The fight to stop biodiversity loss is at a critical moment. Species are currently going extinct at up to 1,000 times the natural background rate. Sixty per cent of examined ecosystem services worldwide have been degraded.

70p ranchoctdt7 16-07-2013 119 5   Download

In 1998, international bird conservation groups focused attention on the site after rediscovery of Edward’s Pheasant (Lophura edwardsi) in these hills, a fowl thought extinct. Today the site is part of a government forest strategy to create a system of 2 million ha of special use forest (national parks, nature reserves and historical sites) throughout the country and it is listed as one of the sites destined to become a nature reserve (41,548 ha) in 2010 (Barney 2005).

61p thieubaotrang 23-04-2013 47 6   Download

This book is about the conservation of genetic diversity of wild plants in situ in their natural surroundings, primarily in existing protected areas but also outside conventional protected areas. A lot of effort has been dedicated to conserving plant biodiversity, but most of this has focused on rare plant communities or individual species threatened with extinction.

232p coeus75 29-01-2013 69 7   Download

As new species emerged and evolved into disparate new forms, other species became extinct. And just as the origin of species and disparity form large-scale patterns, extinctions have formed patterns of their own. One of those patterns is illustrated in . It shows how the extinction rate has gone up and down over the past 540 million years. A few pulses of extinctions stand out above the others. These mass extinctions were truly tremendous cataclysms. The biggest of all, which occurred 250 million years ago, claimed 55% of all gen- era.

16p machuavo 19-01-2013 45 2   Download

A number of biologists have probed the history of insects to determine what factors account for their huge diversity. Peter Mayhew, a biologist at the Univer- sity of York, has tested the leading hypotheses. Insects don’t seem to have a par- ticularly high rate of speciation, he has found, but they do seem good at with- standing extinctions. Fifty percent of all families of insect species alive today existed 250 million years ago. None of the families of tetrapod species alive 250 million years ago exists today; all have been replaced by newer groups.

44p machuavo 19-01-2013 43 3   Download