Abiotic factors affecting the development of Ulva sp. (Ulvophyceae; Chlorophyta) in freshwater ecosystems

Аn attempt is made in this work to establish correlations between the level of enzymatic activity of the soil and factors of an abiotic nature. It was found that the activity of invertase and urease in the soils of more southern territories is higher than that of northern ones. In soils with a pH value of the soil environment close to neutral reaction, the level of enzymatic activity is higher than in more acidic ones. The most sensitive to soil acidity among the studied urease enzymes. In relation to zinc, an inverse correlation was established between its content in the soil and the level of invertase activity. According to the degree of resistance to salinity, the enzymes are arranged in the following order: catalase> invertase> urease. An increase in the mineralization of the soil solution leads to an increase in the activity of urease. Of the studied enzymes, the most labile are representatives of the class of hydrolases (invertase and urease), less labile are oxidoreductases (catalase). Thus, when diagnosing the state of the soil by the level of enzymatic activity, it is necessary to take into account the main abiotic factors affecting the activity of enzymes: the average annual air temperature; pH and mineralization of the soil solution; the content of substances that inhibit microorganisms and block exozymes.

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Abiotic factors affecting the larvicidal activity of the Bacillus thuringiensis Vip3Aa16 toxin against the lepidopteran pest Ephestia kuehniella

Journal of Plant Diseases and Protection ◽

10.1007/s41348-016-0004-5 ◽

2016 ◽

Vol 123 (2) ◽

pp. 59-64 ◽

Cited By ~ 2

Author(s):

Hanen Boukedi ◽

Slim Tounsi ◽

Lobna Abdelkefi-Mesrati

Keyword(s):

Bacillus Thuringiensis ◽

Larvicidal Activity ◽

Abiotic Factors ◽

Ephestia Kuehniella ◽

Factors Affecting ◽

Lepidopteran Pest

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Abiotic factors affecting the composition of forest tree microbiomes

Forest Microbiology ◽

10.1016/b978-0-12-822542-4.00011-5 ◽

2021 ◽

pp. 59-73

Author(s):

Risto Kasanen

Keyword(s):

Abiotic Factors ◽

Forest Tree ◽

Factors Affecting

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Quantifying the Influence of Larval Density on Disease Transmission Indices in Culex quinquefasciatus, the Major African Vector of Filariasis

International Journal of Insect Science ◽

10.1177/1179543319856022 ◽

2019 ◽

Vol 11 ◽

pp. 117954331985602 ◽

Cited By ~ 2

Author(s):

Azubuike Christian Ukubuiwe ◽

Chioma Cynthia Ojianwuna ◽

Israel Kayode Olayemi ◽

Francis Ofurum Arimoro ◽

Innocent Chukwuemeka James Omalu ◽

...

Keyword(s):

Culex Quinquefasciatus ◽

Disease Transmission ◽

Abiotic Factors ◽

Larval Density ◽

Field Trials ◽

Negative Effects ◽

Laboratory Findings ◽

Factors Affecting ◽

Adult Fitness ◽

Larval Crowding

Larval crowding is one of the abiotic factors affecting biological fitness in mosquitoes. This study aims at elucidating, quantitatively, the influence of more larval crowding on aspects of fitness in Culex quinquefasciatus mosquito. To this end, day-old larvae of the species were reared in 4 density regimens equivalent to 1 larva in 1.25, 2.5, 5, and 10 mL of distilled water. Developmental indices, adult fitness indices, and accumulation and utilisation of teneral reserves for metamorphosis were determined at these density regimens. The results revealed varying significant negative effects of larval density on all fitness indices measured for the species. The study also revealed high utilisation of teneral reserves for metamorphosis at high larval densities. The information generated will be useful in making informed-decisions in allocating scare resources for vector control, although field trials are advocated to establish these laboratory findings.

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Factors affecting biochemical composition of seston in an eutrophic reservoir (Pampulha Reservoir, Belo Horizonte, MG

Revista Brasileira de Biologia ◽

10.1590/s0034-71082000000100009 ◽

2000 ◽

Vol 60 (1) ◽

pp. 63-71 ◽

Cited By ~ 3

Author(s):

I. G. BOËCHAT ◽

A. GIANI

Keyword(s):

Seasonal Changes ◽

Biochemical Composition ◽

Abiotic Factors ◽

Eutrophic Lake ◽

Phytoplankton Assemblages ◽

Factors Affecting ◽

Physical Chemical ◽

Algal Groups ◽

Belo Horizonte ◽

The Relationship

Sestonic biochemical composition (lipids, proteins and carbohydrates) may change with varying environmental fluctuations. These changes and the effects in the nutritional status of algae consists of an actual increasing source of interest. The aims of this work were to establish the relationship between biochemical composition of seston and 1) a range of physical, chemical and climatological factors, and 2) the natural fluctuation in the species composition in phytoplankton assemblages of the Pampulha Reservoir, an urban eutrophic lake located in Belo Horizonte, MG. Seasonal changes in the biochemical composition were observed in this study. None of the considered abiotic factors alone seem to affect the biochemical composition. So the effects could only be understood by interactions among different environmental factors. On the other hand, the dominant algal groups probably have some influence in the observed changes in biochemical composition of seston.

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