Effects of river dams on the fish guilds in the northwest region of the Brazilian Amazon

2021 ◽  
Vol 243 ◽  
pp. 106091
Author(s):  
Raniere Garcez Costa Sousa ◽  
Helen Cristina Parazzi de Freitas ◽  
Diego Maia Zacardi ◽  
Charles Hanry Faria-Junior
2020 ◽  
Vol 4 (2) ◽  
pp. 780-787
Author(s):  
Ibrahim Hassan Hayatu ◽  
Abdullahi Mohammed ◽  
Barroon Ahmad Isma’eel ◽  
Sahabi Yusuf Ali

Soil fertility determines a plant's development process that guarantees food sufficiency and the security of lives and properties through bumper harvests. The fertility of soil varies according to regions, thereby determining the type of crops to be planted. However, there is no repository or any source of information about the fertility of the soil in any region in Nigeria especially the Northwest of the country. The only available information is soil samples with their attributes which gives little or no information to the average farmer. This has affected crop yield in all the regions, more particularly the Northwest region, thus resulting in lower food production.  Therefore, this study is aimed at classifying soil data based on their fertility in the Northwest region of Nigeria using R programming. Data were obtained from the department of soil science from Ahmadu Bello University, Zaria. The data contain 400 soil samples containing 13 attributes. The relationship between soil attributes was observed based on the data. K-means clustering algorithm was employed in analyzing soil fertility clusters. Four clusters were identified with cluster 1 having the highest fertility, followed by 2 and the fertility decreases with an increasing number of clusters. The identification of the most fertile clusters will guide farmers on where best to concentrate on when planting their crops in order to improve productivity and crop yield.


2017 ◽  
Vol 5 (2) ◽  
pp. 28
Author(s):  
Rym Ammar Ayachi ◽  
Dhafer Saidane ◽  
Fayçal Mansouric

The present paper aims to assess the Islamic products potential demand for entrepreneurs in the Tunisian Northwest region. In order to do so, we developed a questionnaire which was sent to these entrepreneurs. The survey results show that the latter perceive Islamic Finance as a seductive phenomenon. However, its development appears to be difficult. Indeed, according to the survey results, the lack of knowledge may impede the expansion of Islamic banking in Tunisia. Moreover, the following factors: cost, religious conviction, proximity, flexibility and satisfaction of the needs, may affect the entrepreneurs' choice to deal with Islamic financial institution. In addition, the lack of entrepreneurs' confidence with regard to the compliance of Islamic banking with the Shariah principles has a negative effect on Islamic finance development in the Tunisian Northwest region. For this reason, Tunisian Islamic banks should put more effort to reinforce their competitiveness.


2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Pham Van Loi

Vietnam - Laos has more than 2,000 km of common national borders. The coherent relationship between the two nations and the inhabitants of the two countries has been formed and fostered in history and especially developed over the past 7 decades. The Thai ethnic group in Vietnam has over one million people, residing permanently, concentrated in the Northwest region, the region consists of 8 provinces, of which 4 provinces have the Vietnam-Laos border crossing. This paper focuses on clarifying the practical basis for the Thai people to play a role in the traditional Vietnam-Laos friendship and propose some solutions to promote the role of Thai in maintaining, developing the traditional friendship between Vietnam and Laos, now and in the future.


2020 ◽  
Vol 40 (2) ◽  
pp. 131
Author(s):  
Simon B. Knoop ◽  
Thais Q. Morcatty ◽  
Hani R. El Bizri ◽  
Susan M. Cheyne

2019 ◽  
Vol 24 (2) ◽  
pp. 103
Author(s):  
Tiago D. M. Barbosa ◽  
Suzana M. Costa ◽  
Maria Do Carmo E. Do Amaral

2008 ◽  
Vol 3 (1) ◽  
pp. 91-95
Author(s):  
Ruth Amanda Estupiñán

In the red list of threatened species of Pará State, in Brazil, the salamander Bolitoglossa paraensis was listed as vulnerable. Initially the species was considered a synonym with Bolitoglossa altamazonica, but was recently revalidated. This note discusses the validity of the specimens from the west of the Brazilian Amazon identified as B. paraensis. It is also discussed the categorization of the species as vulnerable, and the records of the species was mapped in the Endemism area Belém. In order to establish a Private Natural Reserve (RPPN), a herpetological survey was carried out in different landscape units of the Nova Amafrutas, in Benevides (Pará), and the records of B. paraensis were mapped in these landscape units. By comparing the abundances recorded by Crump (1971) and those results of the present study, suggested that this species is tolerant to antropic “capoeira” forest (old fallows) next to undisturbed forest. More molecular phylogeographic studies are needed in order to establish a stable the taxonomy status for B. paraensis, and also the definition of its real endemic status in the Center of Endemism of Belém.


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