scholarly journals Diversité Inter Décennale De La Végétation De La Vallée De Goulbi N’Kaba

2018 ◽  
Vol 14 (9) ◽  
pp. 161
Author(s):  
Mahaman Hamissou Illo Souley ◽  
Karim Saley ◽  
Issa Chaibou ◽  
Boubacar M. Moussa ◽  
Ali Mahamane ◽  
...  
Keyword(s):  
Beta Diversity ◽  
Hierarchical Classification ◽  
Stratified Sampling ◽  
Plant Biodiversity ◽  
Simpson Index ◽  
Dimensional Scaling ◽  
Plant Groups ◽  
Ascending Hierarchical Classification ◽  
Mixed Fields ◽  
Multi Dimensional Scaling

The present study is conducted in the Sylvo-Pastoral Zone (ZSP) of the Goulbi N'Kaba Valley and the agricultural zone (fields on adjacent terraces), in the southern center of Niger. The objective of the study is to evaluate the inter-decennial plant biodiversity (2004-2014). Thus, the phytosociological surveys (Daget and Poissonet, 1971) were carried out in plots of 2500 m², along the 6.5 km transects following stratified sampling. An ascending hierarchical classification, followed by an ordination by Nonmetric Multi-dimensional Scaling (NMS) allowed to identify the plant groups. The diversity of each group was evaluated. The results show that the families of Poaceae and Fabaceae are the most abundant in 2004 (15.58% and 11.69%) and in 2014 (18.75% and 7.29%). However, compared to the genera, Indigofera (10.53%), Cassia (6.58%), Acacia (5.26%), Aristida (5.26%) are the most abundant in 2004, while Aristida (4 , 17%), Cassia (4.17%), Spermacoce (3.13%), in 2014. Three groups (mixed, fields, ZSP) have been identified. The 2004 and 2014 index, of Margalef (18,38 and 11,28), Menhinick (2,55 and 1,52), Shannon-Weaver (4,77 and 4,14), the fairness of Pielou (0, 66 and 0.63), the Simpson index (0.89 and 0.91) and Hill (0.95 and 0.93) are high in all the groups, mixed, fields and ZSP (respectively for G1, G2 and G3). But the beta diversity (Whittaker (24), Jaccard (0.52), Sorensen (0.69) index) for each of these groupings remains low. There was no significant change in inter-decennial diversity at the Guidan Tawayé and Korin Habdjia sites from 2004 to 2014.

scholarly journals Phytodiversité et productivité herbacée du futur site de pré-lâché d’autruche d’Afrique du Nord (Struthio camelus camelus L.) dans le Koutous, Niger

2020 ◽  
Vol 14 (2) ◽  
pp. 402-416
Author(s):  
Maïmounatou Ibrahim Mamadou ◽  
Maman Kamal Abdou Habou ◽  
Habou Rabiou ◽  
Ali Mahamane
Keyword(s):  
Diversity Index ◽  
Hierarchical Classification ◽  
Tribulus Terrestris ◽  
Acacia Tortilis ◽  
North African ◽  
Balanites Aegyptiaca ◽  
Struthio Camelus ◽  
The North ◽  
Plant Groups ◽  
Ascending Hierarchical Classification

L’autruche d’Afrique du Nord (Struthio camelus camelus) communément appelée autruche à cou rouge a disparu à l’état naturel au Niger depuis 2004. Le présent article est une contribution au processus de réintroduction de cette espèce, qui vise à caractériser la végétation du site dénommé « Tchillala » dans le Koutous, site pilote pour le pré-lâché de l’autruche. Les relevés phytosociologiques ont été effectués à l’aide de la méthode sigmatiste d’abondance-dominance de Braun-Blanquet dans 42 placettes de 1000 m² (50 m × 20 m). Dans chaque placette, la coupe de la phytomasse herbacée a été réalisée dans des carrés de rendement de 1 m². Au total, soixante-six (66) espèces réparties en cinquante un (51) genres et vingt-huit (28) familles ont été recensées. La classification hiérarchique ascendante des relevés a permis d’individualiser trois groupements végétaux : le groupement à Acacia tortilis et Tribulus terrestris, le groupement à Balanites aegyptiaca et Zornia glochidiata et le groupement à Leptadenia pyrotechnica et Echinochloa colona. La richesse spécifique de ces groupements végétaux varie de quarante un (41) à soixante-deux (62) espèces. L’indice de diversité de Shannon varie de 4,01 à 3,16 bits et l’indice d’équitabilité de Piélou de 0,56 à 0,67. La productivité moyenne de la phytomasse herbacée des trois groupements est de 0,48±0,17 tonnes de matière sèche par hectare et une capacité de charge moyenne de 0,07±0,02 UBT/ha/an. Les spectres biologiques des groupements montrent une dominance des thérophytes. Quant aux spectres phytogéographiques, ils montrent une dominance des espèces paléotropicales. Ce site possède un potentiel floristique pour faire le pré-lâchage des autruches.Mots clés : Struthio camelus camelus, phytosociologie, productivité, réintroduction, Koutous, Niger   English Title: Phytodiversity and herbaceous productivity of the future site of pre-release ostrich of North Africa (Struthio camelus camelus L.) in Koutous, Niger The North African ostrich (Struthio camelus camelus), commonly known as the Red-necked Ostrich, which has been extirpated from Niger since 2004. This article is a contribution to the reintroduction process of this species; aims to characterize the vegetation of the site called "Tchillala" in the Koutous, pilot site for the ostrich pre-release. The phytosociological surveys were carried out using the Braun-Blanquet sigmatism abundance-dominance method in 42 plots of 1000 m² (50 m × 20 m). In each plot, herbaceous phytomass was cut in yield squares of 1 m². A total of sixty-six (66) species divided into fifty-one (51) genera and twenty-eight (28) families were identified. The ascending hierarchical classification of the surveys has shown three plants groups such as Acacia tortilis and Tribulus terrestris group, Balanites aegyptiaca and Zornia glochidiata group and Leptadenia pyrotechnica and Echinochloa colona group. The species richness of these plant groups varies from 62 to 41 species. The Shannon diversity index varies from 4.01 to 3.16 bits and Piélou's equitability index from 0.56 to 0.67. The average productivity of the herbaceous phytomass of the three groups is 0.48 ± 0.17 tonnes of dry matter per hectare and an average carrying capacity of 0.07±0.02 TLU/ha/year. The biological spectra of the groups show a dominance of therophytes. As for phytogeographic spectra, they show a dominance of paleotropical species. This site has a floristic potential to pre-release the individuals of ostrich.Keywords: Struthio camelus camelus, phytosociology, productivity, reintroduction, Koutous, Niger.

Estimation of connectivities of neurons using multi-dimensional scaling

2014 ◽  
Vol 1 ◽  
pp. 382-385
Author(s):  
Kaori Kuroda ◽  
Hiroki Hashiguchi ◽  
Tohru Ikeguchi
Keyword(s):  
Dimensional Scaling ◽  
Multi Dimensional Scaling

Professional volleyball club emblem image for Multi-Dimensional Scaling

2017 ◽  
Vol 22 (2) ◽  
pp. 67-78
Author(s):  
Jeoung-Hak Lee ◽  
Seung-jae Lim ◽  
Sung-Yong Kim ◽  
ki-woong Kim
Keyword(s):  
Dimensional Scaling ◽  
Multi Dimensional Scaling

scholarly journals STATUS KEBERLANJUTAN USAHATANI PADI SAWAH DI KOTA DENPASAR STATUS KEBERLANJUTAN USAHATANI PADI SAWAH DI KOTA DENPASAR

2018 ◽  
Vol 6 (1) ◽  
pp. 55
Author(s):  
Anggreni Madik Linda ◽  
I GAAA Ambarawati ◽  
I Nyoman Gede Ustriyana
Keyword(s):  
Dimensional Scaling ◽  
Multi Dimensional Scaling

Tujuan penelitian ini adalah untuk menganalisis status keberlanjutan usahatani padi berdasarkan lima dimensi keberlanjutan: ekologi, ekonomi, sosial-budaya, hukum dan kelembagaan, dan teknologi dan infrastruktur, dan untuk mengetahui atribut yang sensitif dalam keberlanjutan pertanian padi di Subak Intaran Barat, Desa Sanur Kauh dilihat dari lima dimensi pembangunan berkelanjutan. Penelitian ini menggunakan metode survei dan analisis data menggunakan teknik ordinasi RAP-FARM melalui Multi Dimensional Scaling (MDS) untuk menilai indeks dan status keberlanjutan usahatani padi dalam pembangunan pertanian. Penelitian ini juga mengidentifikasi atribut sensitif yang mempengaruhi indeks keberlanjutan masing-masing dimensi melalui analisis leverage. Dimensi terukur adalah dimensi ekologis, dimensi ekonomi, dimensi sosial budaya, dimensi kelembagaan, dan dimensi teknologi dan infrastruktur. Hasil analisis menunjukkan bahwa penilaian RAP-FARM dari usahatani padi sawah di Subak Intaran Barat memiliki nilai indeks keberlanjutan 73,48, yang dikategorikan ke dalam kategori cukup berkelanjutan. Dimensi ekonomi, teknologi dan infrastruktur memiliki status berkelanjutan yang berkelanjutan sementara dimensi ekologi, sosio-budaya, dan kelembagaan memiliki status berkelanjutan. Analisis leverage menunjukkan bahwa ada 10 atribut dari 29 atribut yang berpengaruh pada indeks keberlanjutan usahatani padi. Atribut yang paling sensitif adalah koperasi kelembagaan petani di dimensi kelembagaan.

THE QSAR RESEARCH ON AURONE INHIBITORS OF HEPATITIS C VIRUS RNA-DEPENDENT RNA POLYMERASE BY APPLYING MULTI-DIMENSIONAL SCALING METHOD

2013 ◽  
Vol 06 (01) ◽  
pp. 1250062
Author(s):  
YONG-HONG HU ◽  
BAO-HUA ZHANG
Keyword(s):  
Hepatitis C Virus ◽  
Hepatitis C ◽  
Rna Polymerase ◽  
Hcv Rna ◽  
Training Set ◽  
Rna Dependent Rna Polymerase ◽  
Dimensional Scaling ◽  
Naturally Occurring ◽  
Virus Rna ◽  
Multi Dimensional Scaling

In this paper, we take naturally occurring 2-benzylidenebenzofuran-3-ones (aurones) inhibitors of hepatitis C virus (HCV) RNA-dependent RNA polymerase (RdRp) as an example to study the Multi-dimensional scaling (MDS) method for structure-activity relationship. By analyzing training set molecules, our MDS method combined with a PROXSCAL algorithm can predict inhibitory activity of most compounds correctly. Thus, a new sample's activity can be estimated and judged conveniently, and whether it should be synthesized can be known. The MDS method is applicable to optimize the structure for a compound and to provide suggestions for drug design.

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