scholarly journals Spatial patterns of the Zostera noltei meadows across the Atlantic coast of Morocco: is there a latitudinal gradient?

2015 ◽  
Author(s):  
Oussama Bououarour ◽  
Reda El Kamcha ◽  
Loubna Boutahar ◽  
Ali Tnoumi ◽  
Bendahhou Zourarah ◽  
...  
Keyword(s):  
Average Length ◽  
Atlantic Coast ◽  
Leaf Length ◽  
The Black Sea ◽  
Leaf Biomass ◽  
North West ◽  
Seagrass Meadows ◽  
Zostera Noltei ◽  
Number Of Leaves ◽  
Rhizome Biomass

Seagrass meadows exist in most shallow, sheltered, soft-bottomed marine coastlines and estuaries throughout the world and rank among the most productive systems in the ocean. Zostera noltei Hornemann is a small seagrass largely widespread in intertidal areas of Western Europe and North-West Africa, the Mediterranean Sea and in the Black Sea. In Morocco, intertidal Zostera noltei meadows were identified at six coastal ecosystems across c.a. 2500 km of its Atlantic coast (Tahaddart estuary, Moulay Bousselham, Sidi Moussa, Oualidia, Khnifiss lagoons and Dakhla Bay). The present work aimed at assessing the spatial and latitudinal variation of Z. noltei meadows by measuring the density of shoots, leaf biomass, root-rhizome biomass, number of leaf /shoot and the average length and width of leafs. Samples were conducted between December 2014 and January 2015, using a hand PVC corer (12.5 of diameter). When possible, a downstream and upstream comparison is performed in each site. Density of shoots fluctuated between 1972 and 9833 shoots m-2. Leaves biomass varied between 32 and 259 gDW/m2 and root-rhizome biomass oscillated between 21 and 314 gDW/m2. Number of leaves per shoot fluctuated between 2.47 and 3.4 leaf per shoot, the leaf length between 4.9 and 30.8 cm and the leaf width 0.6 and 2 mm. These results showed, on the one hand, a clear spatial variation across a downstream-upstream gradient in each site and, on the other hand, a latitudinal pattern in the biomass and morphometry of the Z. noltei meadows across the Atlantic coast of Morocco. Significant differences were evidenced for all variables (ANOVA, p<0.05). The root-rhizome biomass and density of shoots are higher southward while the number of leaves per shoot, leaf biomass and the average length and width of the leaves are greater northward. These results are compared with literature data from the distribution range of Z. noltei. Further analysis regarding the genetics, the associated benthic invertebrates and the sediment contamination are being performed and will increase the knowledge on such ecosystems and help in understanding their interaction with environment conditions.

scholarly journals Spatial patterns of the Zostera noltei meadows across the Atlantic coast of Morocco: is there a latitudinal gradient?

2015 ◽  
Author(s):  
Oussama Bououarour ◽  
Reda El Kamcha ◽  
Loubna Boutahar ◽  
Ali Tnoumi ◽  
Bendahhou Zourarah ◽  
...  
Keyword(s):  
Average Length ◽  
Atlantic Coast ◽  
Leaf Length ◽  
The Black Sea ◽  
Leaf Biomass ◽  
North West ◽  
Seagrass Meadows ◽  
Zostera Noltei ◽  
Number Of Leaves ◽  
Rhizome Biomass

Seagrass meadows exist in most shallow, sheltered, soft-bottomed marine coastlines and estuaries throughout the world and rank among the most productive systems in the ocean. Zostera noltei Hornemann is a small seagrass largely widespread in intertidal areas of Western Europe and North-West Africa, the Mediterranean Sea and in the Black Sea. In Morocco, intertidal Zostera noltei meadows were identified at six coastal ecosystems across c.a. 2500 km of its Atlantic coast (Tahaddart estuary, Moulay Bousselham, Sidi Moussa, Oualidia, Khnifiss lagoons and Dakhla Bay). The present work aimed at assessing the spatial and latitudinal variation of Z. noltei meadows by measuring the density of shoots, leaf biomass, root-rhizome biomass, number of leaf /shoot and the average length and width of leafs. Samples were conducted between December 2014 and January 2015, using a hand PVC corer (12.5 of diameter). When possible, a downstream and upstream comparison is performed in each site. Density of shoots fluctuated between 1972 and 9833 shoots m-2. Leaves biomass varied between 32 and 259 gDW/m2 and root-rhizome biomass oscillated between 21 and 314 gDW/m2. Number of leaves per shoot fluctuated between 2.47 and 3.4 leaf per shoot, the leaf length between 4.9 and 30.8 cm and the leaf width 0.6 and 2 mm. These results showed, on the one hand, a clear spatial variation across a downstream-upstream gradient in each site and, on the other hand, a latitudinal pattern in the biomass and morphometry of the Z. noltei meadows across the Atlantic coast of Morocco. Significant differences were evidenced for all variables (ANOVA, p<0.05). The root-rhizome biomass and density of shoots are higher southward while the number of leaves per shoot, leaf biomass and the average length and width of the leaves are greater northward. These results are compared with literature data from the distribution range of Z. noltei. Further analysis regarding the genetics, the associated benthic invertebrates and the sediment contamination are being performed and will increase the knowledge on such ecosystems and help in understanding their interaction with environment conditions.

scholarly journals Distribution, biomass and phenology of Zostera noltei meadows in the Northern lagoon of Tunis in the summer of 2014

2015 ◽  
Author(s):  
Imen Ben Souissi ◽  
Abdessalem Shili
Keyword(s):  
Average Length ◽  
Total Biomass ◽  
Characteristic Analysis ◽  
Average Width ◽  
Seagrass Meadows ◽  
The North ◽  
Zostera Noltei ◽  
Flowering Rate ◽  
Below Ground ◽  
Number Of Leaves

Seagrass meadows of Zostera noltei are widely distributed over the coasts of Tunisia and represent relatively dominant populations in the Northern lagoon of Tunis. This brackish environment was the subject of a plan of restoration and development implemented in the mid 1980’s to deal with problems of eutrophication. This work is a contribution to the characterization of seagrass meadows of Z. noltei in the Northern lagoon of Tunis, with (i) mapping meadows along 36 equally spaced and well distributed transects, (ii) measuring the biomass with its two components, above and below-ground, in representative stations of different types of seagrass meadows, and (iii) the observation of phenological characteristics of the plant. The results show that Z. noltei meadows grow over 40% of the total area of the lagoon. They spread gradually to the Southern part of the lagoon where they are able to survive and to thrive. The total biomass in the North lagoon of Tunis was about 2512 tons of DW in June of 2014. Most of this biomass comes from dense beds with cover of 50 to 90%. The phenological characteristic analysis shows that the mean density is about 1830 shoots/m², the average length and average width of the leaves are 26.6 cm (SD = 6.9) and 1.8 mm (SD = 0.2), respectively. Depending on the type of cover, the total length of rhizomes varies between 2.3 and 40.6 m/m² and the average number of leaves/shoot is between 3.1 and 4.5 (SD = 0.4). Flowering, which begins in April, continues until the end of August. The flowering rate varies between stations, ranging from 0 to 16% in June of 2014. The study should be extended to other seasons to better understand the characteristics and dynamics of Z. noltei meadows, which have a very important role in the restoration and the ecological balance of the Northern lagoon of Tunis.

scholarly journals Distribution, biomass and phenology of Zostera noltei meadows in the Northern lagoon of Tunis in the summer of 2014

2015 ◽  
Author(s):  
Imen Ben Souissi ◽  
Abdessalem Shili
Keyword(s):  
Average Length ◽  
Total Biomass ◽  
Characteristic Analysis ◽  
Average Width ◽  
Seagrass Meadows ◽  
The North ◽  
Zostera Noltei ◽  
Flowering Rate ◽  
Below Ground ◽  
Number Of Leaves

Seagrass meadows of Zostera noltei are widely distributed over the coasts of Tunisia and represent relatively dominant populations in the Northern lagoon of Tunis. This brackish environment was the subject of a plan of restoration and development implemented in the mid 1980’s to deal with problems of eutrophication. This work is a contribution to the characterization of seagrass meadows of Z. noltei in the Northern lagoon of Tunis, with (i) mapping meadows along 36 equally spaced and well distributed transects, (ii) measuring the biomass with its two components, above and below-ground, in representative stations of different types of seagrass meadows, and (iii) the observation of phenological characteristics of the plant. The results show that Z. noltei meadows grow over 40% of the total area of the lagoon. They spread gradually to the Southern part of the lagoon where they are able to survive and to thrive. The total biomass in the North lagoon of Tunis was about 2512 tons of DW in June of 2014. Most of this biomass comes from dense beds with cover of 50 to 90%. The phenological characteristic analysis shows that the mean density is about 1830 shoots/m², the average length and average width of the leaves are 26.6 cm (SD = 6.9) and 1.8 mm (SD = 0.2), respectively. Depending on the type of cover, the total length of rhizomes varies between 2.3 and 40.6 m/m² and the average number of leaves/shoot is between 3.1 and 4.5 (SD = 0.4). Flowering, which begins in April, continues until the end of August. The flowering rate varies between stations, ranging from 0 to 16% in June of 2014. The study should be extended to other seasons to better understand the characteristics and dynamics of Z. noltei meadows, which have a very important role in the restoration and the ecological balance of the Northern lagoon of Tunis.

scholarly journals Phenotypic and molecular variability of maize (Zea mays L.) Induced with X-ray

2021 ◽  
Vol 18 (2) ◽  
pp. 1-25
Author(s):  
Odunayo Joseph Olawuyi ◽  
David Franklin Igata ◽  
Akinlolu Olalekan Akanmu ◽  
Abeeb Abiodun Azeez
Keyword(s):  
Plant Height ◽  
Principal Component ◽  
Leaf Length ◽  
Leaf Width ◽  
Shoot Biomass ◽  
Leaf Biomass ◽  
Group Method ◽  
X Ray ◽  
Significant Difference ◽  
Number Of Leaves

Ten genotypes of maize collected from National Center for Genetic Resources and Biotechnology (NACGRAB) were induced with X-ray for morphological and molecular assessment. The experimental design was complete randomized design with four replicates. Morphological and molecular statistical analyses of treated genotypes were conducted using SAS and Power Maker Packages, respectively while dendrogram was generated using Jaccards similarity coefficient using Unweighted Paired Group Method and Arithmetic Averages (UPGMA). The study revealed significant difference which is an indication of genetic variation of characters in treated maize. Genotype DTSR-Wco performed best in plant height (62.35 cm), leaf length (62.35 cm), number of leaves (3.15), leaf width (7.55 cm) and dry leaf biomass (0.24 g). X-ray at 90 Kv/mass, 95 Kv/mass and 100 Kv/mass decreased plant heights to 54.25cm, 53.87cm and 54.10cm respectively compared to Control. Heritability estimate was greater than 70% for all characters evaluated. Genotype TZM 1551 at 0 Kv/mass yielded the highest concentration of DNA at 2841.60 ng/ul and the highest genomic DNA concentration was obtained at 95 Kv/mass for TZM 132 with 1.91%. Primer BMC 1755 was most polymorphic with 58.77% in treated maize genotypes. The plant height was strongly correlated with leaf length (r=0.9), leaf width (r=0.76) and number of leaves (r=0.77). Principal component analysis showed close relationship between plant height (-0.03) and leaf length (0.05) compared with leaf width (-0.67) and number of leaves (0.69). Dry shoot biomass (0.05) was closely related to dry root biomass (-0.03) and dry leaf biomass (-0.04).

Modeling of ecological conditions in the Euxine Basin in the Sarmatian and Maeotian by methods of diatom analysis

2019 ◽  
pp. 257-261
Author(s):  
Eleonora P. Radionova
Keyword(s):  
Black Sea ◽  
Late Miocene ◽  
The Black Sea ◽  
Subtidal Zone ◽  
Diatom Analysis ◽  
Diatom Flora ◽  
North West ◽  
Ecological Conditions ◽  
The North

The associations and ecological conditions of the existence of modern diatoms of the North-West (Pridneprovsky), Prikerchensky and Eastern regions of the subtidal zone of the Black Sea are considered. Based on the unity of the composition of the Present and Sarmatian-Meotian diatom flora, an attempt has been made to model some of the ecological c situation of the Late Miocene Euxinian basin.

scholarly journals Foliar spray of gibberellic acid influences morphological attributes and foliage yield of coriander (Coriandrum sativum L.)

2018 ◽  
Vol 5 (1) ◽  
pp. 1-9
Author(s):  
Dhiman Das ◽  
Asim Kumar Bhadra ◽  
Mohd Moniruzzaman
Keyword(s):  
Gibberellic Acid ◽  
Vegetative Growth ◽  
Leaf Length ◽  
Distilled Water ◽  
Water Spray ◽  
Single Plant ◽  
Plant Weight ◽  
Morphological Attributes ◽  
Number Of Leaves ◽  
Different Doses

A field experiment was conducted at the research field of Sher-e- Bangla Agricultural University, Dhaka during the period from December 1, 2016 to January 11, 2017 to investigate the effect of gibberellic acid (GA3) on vegetative growth, morphological attributes and foliage (leaf) yield of coriander (Coriandrum sativum L.). The experimental treatments consisted of eight different doses of GA3 viz., 0 (distilled water spray), 5, 10, 15, 20, 25, 30 and 35 ppm. The variety Rosina (Pahuja Co., India) was used as planting material and different doses of GA3 were applied on the plants at 25 and 30 days after sowing. The experiment was laid out in Randomized Complete Block Design with three replications. GA3 had significant effect on vegetative growth, morphology, foliage yield and yield contributing characters of coriander. Plant height, number of leaves plant-1, leaf length, plant spread and single plant weight were found maximum from the application of GA3 at 20 ppm, which was closely followed by 25 ppm GA3. Application of GA3 at 20 ppm produced the highest weight of foliage m-2. A strong positive correlation of foliage yield was observed with plant height, number of leaves plant-1, leaf length, plant spread, single plant weight and weight of foliage m-2. Application of GA3 at 20 ppm gave maximum foliage yield (9.34 t ha-1) which was followed by GA3 at 15 ppm (8.46 t ha-1) and 25 ppm (8.06 t ha-1), and the minimum foliage yield was recorded from control (distilled water spray) (4.90 t ha-1). Application of GA3 at 20 ppm increased foliage yield over control by 47.54 %. A quadratic relationship between applied GA3 concentration and foliage yield was found; the regression equation was y = 4.87 + 0.375x – 0.009x2 from which it came up to be optimum dose of GA3 as 20.83 ppm.Res. Agric., Livest. Fish.5(1): 1-9, April 2018

On the History of the Anglo-Russian Confrontation in the Western Caucasus

2021 ◽  
pp. 66-72
Author(s):  
Zalina V. Sosranova ◽  
Zalina M. Basieva
Keyword(s):  
Black Sea ◽  
Political Activity ◽  
Legal Rights ◽  
The Black Sea ◽  
Western Caucasus ◽  
The Caucasus ◽  
European Continent ◽  
North West ◽  
The Western Caucasus ◽  
Xix Century

The article examines the scale and methods of the anti-Russian military-political activity of British emissaries in the Western Caucasus in the first half of the 19th century. The scientific novelty lies in the fact that for the first time in the work the intelligence activity of British “traveling” agents in the Western Caucasus is subjected to a special study, as an independent, gaining strength way of fighting in international contradictions for the Caucasus. The relevance of the topic of the proposed article seems to us indisputable due to the incompleteness of international rivalry and the eternal Eastern question. Russian Empire in the late 20s — early 30s XIX century. took possession of all legal rights to the North-West Caucasus and outlets to the Black Sea. With its confident military successes and new territorial accessions, Russia threw a serious challenge to the European powers, and especially England, the dominant power on the European continent at that time. One of the most important tasks of England is to nullify all the achievements of Russia in Turkey and prevent its consolidation in the territory of the Western Caucasus. England, adhering to the favorite method of “raking in the heat with someone else’s hands”, and in Circassia is testing its effectiveness. Since the 30s. XIX century. Numerous British agents flooded the Caucasus, turning the Circassians against Russia. The Black Sea coast of the Caucasus has become a place of uninterrupted supply of weapons to the mountaineers. As a result of the work, the author comes to the conclusion that the sources considered in the work can represent a scientific basis for confirming the involvement of Britain in anti-Russian agitation in the Western Caucasus. The uninterrupted supply of weapons to the highlanders organized by British agents helped to maintain military tension and a fighting spirit in Circassia.

scholarly journals Performance Of Bilati Dhonia (Eryngium Foetidum L.) Under The Canopy Of Different Tree Species

1970 ◽  
Vol 36 (2) ◽  
pp. 255-262
Author(s):  
M Moniruzzaman ◽  
AKM Qamruzzaman
Keyword(s):  
Tree Species ◽  
Agricultural Research ◽  
Leaf Length ◽  
Research Station ◽  
Direct Sunlight ◽  
Hill District ◽  
Eryngium Foetidum ◽  
Number Of Leaves ◽  
Sun Light ◽  
Growth Characters

Performance of ‘Bilati Dhonia’ (Eryngium foetidum L.) grown under the shades of different tree species, namely guava, jackfruit, mango, jujube, and farmers’ practice (grown under artificial shade) was evaluated at the Agricultural Research Station, Raikhali, Rangainati Hill District during two consecutive years of 2004-05 and 2005-06. The results revealed that plant height, leaf length, number of leaves per plant and fresh weight per plant were significantly higher under the canopies of various trees and farmers’ practice than those grown under direct sun light. Different growth characters were better under the shades of jackfruit and guava trees than those of other species. Periods to first and 50% flowering under tree species were longer than that under direct sunlight. The highest fresh yield (mean of two years) of ‘Bilati Dhonia’ was found in the farmers’ practice (27.58 t/ha), which was similar to those under guava (27.31 t/ha) and jackfruit trees (27.51 t/ha). Keywords: Bilati Dhonia (Eryngium foetidum L.); tree shades; hilly area. DOI: http://dx.doi.org/10.3329/bjar.v36i2.9252 BJAR 2011; 36(2): 255-262

scholarly journals GROWTH OF ‘PRATA-ANA’ BANANA’S MICROSHOOTS CLONE GORUTUBA FROM SYNTHETIC SEEDS:SUBSTRATES AND BAP CONCENTRATION

2017 ◽  
Vol 39 (5) ◽  
Author(s):  
JÚLIO CÉSAR GOMES PEREIRA ◽  
SELMA SILVA ROCHA ◽  
LUCIANA CARDOSO NOGUEIRA LONDE ◽  
MARCELA CAROLINE BATISTA DA MOTA ◽  
PABLO FERNANDO SANTOS ALVES ◽  
...  
Keyword(s):  
Culture Medium ◽  
Economic Importance ◽  
Leaf Length ◽  
Naphthalene Acetic Acid ◽  
Synthetic Seed ◽  
Ms Medium ◽  
World Production ◽  
Number Of Leaves ◽  
Alginate Matrix

ABSTRACT The banana crop stands out as an activity of great social and economic importance in Brazil, which occupies the fifth place in world production. Synthetic seed production is becoming promising for a micropropagation and in vitro conservation. The aim of the study was to analyze the conversion and growth of ‘Prata-anã’ banana’s microshoots clone Gorutuba from synthetic seed in MS medium and vermiculite, different substrates and concentrations of BAP (6-benzylaminopurine) associated with ANA (acetic naphthalene acid) in the constitution of its capsule were tested. The microshoots were immersed in the sodium alginate matrix (3%) and dripped in a solution of CaCl2.2H2O (100 mM) for complexation and then in KNO3 solution (100 mM) to decomplex. The experimental design was completely randomized in a 2 x 5 factorial design (substrate x BAP concentrations), containing different substrates (MS culture medium and vermiculite) and BAP concentrations (2.22, 4.44, 6.66, 8.88 and 13.32 µmol L-1) associated with NAA (naphthalene acetic acid) 0.54 µmol L-1, totaling 10 treatments, with 4 replicates, and that each replicate containing 5 seeds. The evaluations of conversion, number of leaves, leaf length, leaf height, number of roots, root length and oxidation were performed at 30 and 60 days.The use of the MS medium provided better growth results in relation to vermiculite as substrate, in which the different BAP concentrations did not differ from each other. It was found that, in MS culture medium, BAP concentrations above 8.88 µmol L-1 in the capsule composition are not indicated for microshoots growth.

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