A phytogeographic survey of Southern Benin

Bothalia ◽  
1983 ◽  
Vol 14 (3/4) ◽  
pp. 579-585 ◽  
Author(s):  
G. Paradis
Keyword(s):  
Fresh Water ◽  
Soil Characteristics ◽  
Deciduous Forests ◽  
Human Influence ◽  
The West ◽  
Rainfall Gradient ◽  
Floating Vegetation ◽  
Lophira Lanceolata ◽  
Southern Benin ◽  
Forest Islands

Southern Benin has a dry subequatoriai climate with a rainfall gradient from 850 mm in the west to 1 500 mm in the east, the geomorphology is varied and the vegetation has been subjected to strong human influence. There are numerous plant formations, namely: 1, forest islands which are probably relics of the primitive vegetation and include (a) dense semi-deciduous forests of several types, (b) swamp forests of two types, (c) periodically flooded forest of two types, (d) Lophira lanceolata  (Hutchinson Dalziel, 1954-72) woodlands and (e) mangrove swamps; 2, formations which are probably derived and include (a) thickets of several types, (b) tree savannas and shrub savannas, (c) grassy savannas and prairies varying according to soil characteristics and (d) halophytic grasslands; and 3, floating vegetation on fresh-water lakes.

Long-term fertility experiments for irrigated rice in the West African Sahel: effect on soil characteristics

2004 ◽  
Vol 85 (1) ◽  
pp. 61-77 ◽  
Author(s):  
S.M. Haefele ◽  
M.C.S. Wopereis ◽  
A.-M. Schloebohm ◽  
H. Wiechmann
Keyword(s):  
Soil Characteristics ◽  
West African ◽  
The West ◽  
Irrigated Rice ◽  
West African Sahel ◽  
African Sahel

Fresh-Water Algae of the West Falklands

1924 ◽  
Vol 1924 (7) ◽  
pp. 283
Author(s):  
Elinor F. Vallentin
Keyword(s):  
Fresh Water ◽  
The West

The Maglemose Remains of Holderness and their Baltic Counterparts

1924 ◽  
Vol 4 (1) ◽  
pp. 57-70 ◽  
Author(s):  
A. Leslie Armstrong
Keyword(s):  
Sea Level ◽  
Fresh Water ◽  
West Coast ◽  
Peat Moss ◽  
The West ◽  
Neolithic Culture ◽  
Water Lake ◽  
Fresh Water Lake

During recent years certain transitional cultural stages have been recognised which link up the Palæolithic and Neolithic civilisations, and for which the term Mesolithic is generally accepted. Of these the Maglemose stage is perhaps the most important, because in it are seen pronounced Palæolithic influences, and survivals, side by side with the first recognisable expressions of Neolithic culture.The typical station was discovered in 1900 by Dr. Sarauw, the Danish archæologist, in the peat moss of Maglemose, literally “the great moor,” formerly a fresh water lake but now thirteen feet above sea level, and situated near Mullerup, on the west coast of Zeeland.

scholarly journals Serological, molecular and phylogenetic analysis of Rice Yellow Mottle Virus (RYMV) isolates collected in Southern-Benin

2021 ◽  
Vol 8 (6) ◽  
pp. 224-236
Author(s):  
Issaka Souley ◽  
◽  
Bachabi Louisiane ◽  
Naroua Illiassou ◽  
Basso Adamou ◽  
...  
Keyword(s):  
Phylogenetic Analysis ◽  
Central Africa ◽  
Viral Disease ◽  
Mottle Virus ◽  
Economic Losses ◽  
Rice Yellow Mottle Virus ◽  
The West ◽  
African Lineage ◽  
Yellow Mottle ◽  
Southern Benin

The rice yellow mottle is the best known viral disease of rice in Africa. It causes significant economic losses in farmer’s fields. The serological properties of Rice Yellow Mottle Virus (RYMV) isolates, collected in Southern Benin, were assessed by immunological tests with polyclonal and monoclonal antibodies (Pabs and MAbs). The isolates CP (Capsid protein) portions, obtained by RT-PCR, were sequenced and their amino-acids sequences were analyzed and used for phylogenetic analysis. Three different RYMV pathogenic groups, including three resistance breaking (RB) isolates (Be20, Be21 and Be27) which over came allele rymv1-5gene, were identified. Two serotypes Ser1/strain S1 and Ser2/ strain S2 were also distinguished. The molecular properties of the isolates CP gene and the phylogenetic characteristics indicated that the Southern Benin RYMV strain is heterogeneous. The strain S1-Benin linked to the West Central African lineage(S1-WCA) is related to strain from Togo and Niger, whereas, the strain S2 Benin is the stumps of the West African lineage (S1-WA) and is related to Mali, Burkina Faso and Ivory Coast RYMV strains. These results reported the virus pathogenicity level and showed the relationships between RYMV strains in all Dahomey gap countries and in West and Central Africa. Keywords: serotypes, RYMV strains, RB isolates and phylogenetic analysis

scholarly journals The geographical distribution of soil elements determines the boundaries of the Daodi-zone of medicinal plant (Ligusticum chuanxiong Hort.)

2021 ◽  
Author(s):  
Hongyang Lv ◽  
Hai Wang ◽  
Qian Fang ◽  
Lei Kang ◽  
Guiqi Han ◽  
...  
Keyword(s):  
Chemical Elements ◽  
Soil Characteristics ◽  
Pca Analysis ◽  
Natural Boundary ◽  
The West ◽  
Growth Environment ◽  
Icp Ms ◽  
Sample Points ◽  
Set Up ◽  
Production Zone

Abstract. Understanding the boundary of plants' best production zone is of great significance to the rational introduction cultivation. We set up 9 sample points in the center-zone and 28 sample points extending eastward along the longitude. Then, we were collecting the bulk soil of L.chuanxiong, testing soil properties and elements. Later, a multi-point cultivation test was carried out on L.chuanxiong, the content of elements in the plant measured by ICP-MS, and HPLC detected the active ingredients. Based on hierarchical clustering and PCA analysis, the study zone's soil element was divided into three groups. In the L.chuanxiong cultivation experiments, we found Ligustilide in rhizomes was positively related to Se and Sr and negatively related to Mn and the chemical elements. This study successfully verified that the medicinal plant's Daodi-zone has a natural boundary, and L.chuanxiong's Daodi-zone may be from east of Dujiangyan to the west edge of Longquan, rich in Na, Mg, K and Low Mn is the soil characteristics of the area. Moreover, we put forward a method to identify L.chuanxiong's Daodi-zone based on characteristic soil elements, which can also provide a practical basis for dividing other economic plants' growth environment.

scholarly journals Nivní malakofauna řeky Ohře – její minulost a současnost [The floodplain molluscan fauna of the Ohře River (Czech Republic) – its past and present]

2011 ◽  
Vol 10 ◽  
pp. 51-64
Author(s):  
Jitka Horáčková ◽  
Vojen Ložek ◽  
Lucie Juřičková
Keyword(s):  
Czech Republic ◽  
Alpha Diversity ◽  
Middle Part ◽  
Intensive Agriculture ◽  
Floodplain Forests ◽  
Human Influence ◽  
The West ◽  
The Holocene ◽  
Molluscan Fauna

The recent molluscan assemblages of all floodplain forests on the 256 km long Ohře River were studied (West and Northwest Bohemia, Czech Republic). Altogether, 75 species of terrestrial Gastropoda representing 30% of the total Czech malacofauna, were recorded at sites selected during previous and recent research from 1950−2010. The Ohře malacofauna is impoverished of many forest and floodplain species in comparison to molluscan assemblages of smaller Bohemian rivers to the west and northwest. The richest molluscan assemblages occur on the upper part of the river, while the middle and lower parts are very poor. Low alpha-diversity of these parts of the Ohře River can be explained by (1) intensive agriculture in floodplain areas of the middle part of the river, (2) the migration barrier of the Nechranice Dam between the upper and middle river parts, and (3) long-term human influence on the lower part of the Ohře River during the Holocene.

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