scholarly journals Aphids (Homoptera, Aphidodea) inhabiting the shrubs of Pinus mugo Turra in the green areas of Lublin. Part I. The population dynamics

2012 ◽  
Vol 58 (1) ◽  
pp. 153-164
Author(s):  
Bożenna Jaśkiewicz ◽  
Aneta Sławińska
Keyword(s):  
Population Dynamics ◽  
Species Composition ◽  
Weather Conditions ◽  
Aphid Population ◽  
Pinus Mugo ◽  
Mountain Pine ◽  
Air Temperatures ◽  
Green Areas

The studies were conducted on the shrubs of mountain pine (<i>Pinus mugo</i> Turra) in the years 1999-2001. Observations were performed on the plants growing in the green areas of Lublin in two sites: a street site (A) and a park one (B). The purpose of the studies was to establish the species composition and the population dynamics of aphids inhabiting dwarf mountain pine. The studies on the shrubs of the mountain pine found out the presence of four species of aphids: <i>Cinara pini</i> L., <i>Schizolachnus pineti</i> F., <i>Eulachnus rileyi</i> (Will.) and <i>Pineus pini</i> (Ratz.). Among those, only <i>C. pini</i> occurred in both sites in each of the studied years. Weather conditions had an effect on the development of aphid population. A delayed period of vegetation, air temperatures above 30<sup>°</sup>C as well as stormy rainfalls considerably limited the population of aphids.

scholarly journals Aphids (Homoptera, Aphidodea) inhabiting the shrubs of Pinus mugo Turra in the green area of Lublin. Part II. Domination and frequency of aphids, their natural enemies and the injuries caused by aphids

2012 ◽  
Vol 58 (1) ◽  
pp. 165-174
Author(s):  
Aneta Sławińska ◽  
Bożenna Jaśkiewicz
Keyword(s):  
Natural Enemies ◽  
Aphid Population ◽  
Pinus Mugo ◽  
Parasitic Hymenoptera ◽  
Green Area ◽  
Mountain Pine ◽  
Green Areas ◽  
Predatory Arthropods

Observations were conducted in the years 1999-2001 on the shrubs <i>Pinus mugo</i> Turra growing in the green areas of Lublin in two sites (street and park). The purpose of the studies was to establish the domination and frequency of aphids, their effect on the decorative character of shrubs and the occurrence of the aphidophagous arthropods in the aphid colonies inhabiting mountain pine. It was found out that <i>Schizolachnus pineti</i> F. was the dominating species in the street site (A), while <i>Cinara pini</i> L. dominated in the park site (B). The decorative character of shrubs was clearly lowered only by aphids <i>S. pineti</i>. Predatory arthropods occurred in aphid colonies inhabiting the shrubs <i>P. mugo</i>. Their population in both sites was low, that is why they probably had little influence on limiting the aphid population. Parasitic Hymenoptera of I and II degrees obtained from a culture of aphid mummies were more numerous in the street site.

scholarly journals Aphids (Homoptera, Aphidodea) inhabiting the trees Crataegus x media Bechst. in the urban green area. Part I. The population dynamics

2013 ◽  
Vol 57 (1-2) ◽  
pp. 145-156
Author(s):  
Bożena Jaśkiwicz ◽  
Aneta Sławińska
Keyword(s):  
Population Dynamics ◽  
Weather Conditions ◽  
Aphid Species ◽  
Warm Spring ◽  
Mild Winter ◽  
Green Area ◽  
Aphis Pomi ◽  
Air Temperatures ◽  
Urban Green Area ◽  
Green Areas

The studies were conducted in the years 1999-2001 in the green areas of Lublin, on the trees of <i>Crataegus</i> x <i>media</i> Bechst. The purpose of the studies was to establish the species composition and the population dynamics of aphids inhabiting hawthorn in the street and park sites. The studies found out the presence of four aphid species on the examined trees, namely <i>Aphis pomi</i> De Geer, aphids from the genus <i>Dysaphis</i> Börn., <i>Ovatus crataegarius</i> (Walk.) and <i>Rhopalosiphum insertum</i> (Walk.). More aphid species and bigger populations were found in the street site (A) as compa red with the park site (B).The weather conditions (air temperatures of over 30°C and stormy rainfalls) limited the population of all aphid species. On the other hand, a mild winter and a warm spring with the rainfalls within the norm caused that the number of aphids decreased considerably.

A checklist of Mycobiota recorded in burnt and unburnt Pinus mugo plantations in the Curonian spit (Lithuania)

2012 ◽  
Vol 18 (1) ◽  
pp. 66-79 ◽  
Author(s):  
Ernestas Kutorga ◽  
Gražina Adamonytė ◽  
Reda Iršėnaitė ◽  
Jonas Kasparavičius ◽  
Svetlana Markovskaja ◽  
...  
Keyword(s):  
Species Composition ◽  
Pinus Mugo ◽  
Crown Fire ◽  
Curonian Spit ◽  
Mountain Pine ◽  
Different Seasons ◽  
First Time

Abstract Kutorga E., Adamonytė G., Iršėnaitė R., Kasparavičius J., Markovskaja S., Motiejūnaitė J., Treigienė A., 2012: A checklist of mycobiota recorded in burnt and unburnt Pinus mugo plantations in the Curonian Spit (Lithuania) [Degusių ir nedegusių kalninės pušies (Pinus mugo) plantacijų Kuršių nerijoje (Lietuva) mikobiotos konspektas]. - Bot. Lith., 18(1): 66-79. A devastating crown-fire occurred in May 2006 in mountain pine (Pinus mugo) plantations located in the Curonian Spit (Lithuania). During different seasons (spring and autumn) from 2007 to 2009, the mycobiota (including myxobiota) of burnt and unburnt P. mugo stands was examined in permanent sampling plots. The mycobiota checklist provides data on species composition and substrates occupied by fungi and myxomycetes. A total of 390 species of fungi and myxomycetes were recorded. At unburnt sites, 262 species were identified, 215 - at burnt sites. Forty three species were registered for the first time in Lithuania. Rare and noteworthy species are commented.

Vulnerability of sweet cherry cultivars to continuous periods of spring frosts in Plovdiv, Bulgaria

2020 ◽  
Vol 12 (4) ◽  
pp. 348-352
Author(s):  
S. Malchev ◽  
S. Savchovska
Keyword(s):  
Sweet Cherry ◽  
Weather Conditions ◽  
Frost Damage ◽  
Cold Weather ◽  
Bud Burst ◽  
Intermediate Group ◽  
Air Temperatures ◽  
Wide Range ◽  
Group Form ◽  
Sweet Cherry Cultivars

Abstract. The periods with continuous freezing air temperatures reported during the spring of 2020 (13 incidents) affected a wide range of local and introduced sweet cherry cultivars in the region of Plovdiv. They vary from -0.6°C on March 02 to -4.9°C on March 16-17. The duration of influence of the lowest temperatures is 6 and 12 hours between March 16 and 17. The inspection of fruit buds and flowers was conducted twice (on March 26 and April 08) at different phenological stages after continuous waves of cold weather conditions alternated with high temperatures. During the phenological phase ‘bud burst’ (tight cluster or BBCH 55) some of the flowers in the buds did not develop further making the damage hardly detectable. The most damaged are hybrid El.28-21 (95.00%), ‘Van’ (91.89%) and ‘Bing’ (89.41%) and from the next group ‘Lapins’ (85.98%) and ‘Rosita’ (83.33%). A larger intermediate group form ‘Kossara’ (81.67%), ‘Rozalina’ (76.00%), ‘Sunburst’ (75.00%), ‘Bigarreau Burlat’ (69.11%) and ‘Kuklenska belitza’ (66.67%). Candidate-cultivar El.17-90 ‘Asparuh’ has the lowest frost damage values of 55.00% and El.17-37 ‘Tzvetina’ with damage of 50.60%.

Exploring species composition and population dynamics of thrips (Thysanoptera: Thripidae) in peanut crops in Argentina

2021 ◽  
Author(s):  
S. de Breuil ◽  
A. Giudici ◽  
F. R. La Rossa ◽  
J. Baldessari ◽  
N. Bejerman ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Species Composition

scholarly journals Predicting harvest of non-native signal crayfish in lakes — a role for changing climate?

2016 ◽  
Vol 73 (5) ◽  
pp. 785-792 ◽  
Author(s):  
Patrik Bohman ◽  
Lennart Edsman ◽  
Alfred Sandström ◽  
Per Nyström ◽  
Marika Stenberg ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Water Temperature ◽  
Temperature Data ◽  
Adult Survival ◽  
Winter Mortality ◽  
Freshwater Crayfish ◽  
Catch Per Unit Effort ◽  
Signal Crayfish ◽  
Cool Water ◽  
Air Temperatures

The signal crayfish (Pacifastacus leniusculus) was introduced to Sweden in 1960, and it has a high commercial and recreational value, but it may also have negative effects on native ecosystems. To better predict how climate warming will affect population dynamics of this cool-water crayfish, we explored the role of temperature and density dependence as explanatory factors of the subsequent years’ catch rates of commercially sized signal crayfish in four Swedish lakes. We found air temperatures to be good proxies for water temperatures in all lakes, except during winter. We could only obtain water temperature data for Lake Vättern, and winter temperature data were therefore only included in the analysis of catch-per-unit-effort patterns in this lake. Our results indicate that increasing mean air temperatures will potentially affect the population dynamics of cool-water freshwater crayfish species such as the signal crayfish. Based on data from four lakes, it seems that the population dynamics of signal crayfish are lake-specific and could be affected by either recruitment during the juvenile stage, the survival and growth of adults, or both. Increased fluctuations in water temperature during winter may potentially influence adult survival. To better predict the effects of global warming on the dynamics of cool-water crayfish populations, we suggest that future studies should investigate recruitment in crayfish along temperature gradients and the influence of variations in water temperature on winter mortality.

scholarly journals Performance Evaluation of a CO2 Refrigeration System Enhanced with a Dew Point Cooler

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1079 ◽  
Author(s):  
Martin Belusko ◽  
Raymond Liddle ◽  
Alemu Alemu ◽  
Edward Halawa ◽  
Frank Bruno
Keyword(s):  
Weather Conditions ◽  
Dew Point ◽  
Coefficient Of Performance ◽  
Experimental Program ◽  
Refrigeration System ◽  
Conventional System ◽  
Ambient Temperatures ◽  
Air Temperatures ◽  
Condenser Temperature

Dew point cooling (DPC) is a novel indirect evaporative cooling concept capable of delivering air temperatures approaching the dew point. Coupling this technology with CO2 refrigeration is well suited to minimising transcritical operation when the coefficient of performance (COP) is dramatically reduced in hot climates. A substantial experimental program was conducted to characterise this combination by testing a 20 kW CO2 refrigeration system subject to ambient temperatures above 40 °C. It was demonstrated that DPC operation not only avoided transcritical operation during such weather conditions, but also increased the COP by up to 140% compared to the conventional system. The combination of these technologies was successfully mathematically modelled, from which the optimum condenser inlet air temperature was identified for each condenser temperature. Using this optimum condition, it was possible to maximise the COP for a range of conditions applicable to the psychometric chart. An annual case study for Adelaide, Australia was conducted which demonstrated that optimally coupling DPC with CO2 refrigeration can reduce the annual energy consumption and peak demand by 16% and 47%, respectively, compared to a conventional CO2 booster system. Furthermore, the number of hours of transcritical operation was reduced from 3278 to 27.

scholarly journals Ecological and biological characteristics of the dendroflora of Cheboksary in the greening system of the city

2021 ◽  
Vol 10 (3) ◽  
pp. 105-111
Author(s):  
Konstantin Vitalyevich Samokhvalov ◽  
Evgeny Arkadievich Sinichkin ◽  
Aleksandr Petrovich Arsentiev
Keyword(s):  
Species Composition ◽  
Woody Plants ◽  
Woody Plant ◽  
Central Zone ◽  
Industrial Area ◽  
Comprehensive Analysis ◽  
Green Areas ◽  
Degree Of Participation ◽  
Economic Zones ◽  
The City

The paper presents the results of a comprehensive analysis of the species composition of Cheboksary. The analysis of the dendroflora of the urban environment was carried out according to 3 indicators: the territory of woody plants, the occurrence of woody plant species in landscaping, the structure of the landscaping system. The arboreal vegetation of Cheboksary is represented by 73 species belonging to 43 genera and 20 families. The predominant part of the dendroflora is represented by the covered-seeded plants (86,3%), the gymnosperms - 13,7%. In the dendroflora of green areas of the city, the most widely represented families are Rosaceae, Pinaceae, Salicaceae (48%). The analysis of the species composition of woody plants showed that in the functional and economic zones of Cheboksary plantings of general use are represented by 65 species, plantings of limited use - 52 species, plantings along the streets and main roads - 50 species. The analysis of the species composition of woody plants depending on the share of their participation in landscaping revealed that the greatest number of woody plants is used with low (51 species) and medium (50 species) share. The analysis of the degree of participation of woody plants in landscaping in the four identified functional and economic zones of Cheboksary found that the greatest number of taxa prevail with an average participation in the central zone (37 species), the coastal and suburban zones (36 species). The largest number of species of woody plants grow in the green areas of the central functional and economic zone, where the landscaping involved 66 species, the smallest number grow in the green areas of the industrial area (36 species).

scholarly journals Dynamics of the abundance of cuckoo wasps (Hymenoptera, Chrysididae) in the conditions of the altitudinal-belt heterogeneity of the North Caucasus

2021 ◽  
Vol 35 ◽  
pp. 00023
Author(s):  
Nikolay Vinokurov
Keyword(s):  
Population Dynamics ◽  
New Species ◽  
Weather Conditions ◽  
Nature Management ◽  
North Caucasus ◽  
Protection Measures ◽  
Altitudinal Belt ◽  
The North ◽  
Short Period ◽  
First Time

The work provides data on the dynamics of the abundance of 205 taxa from 19 genera: Cleptes, Colpopyga, Elampus, Omalus, Philoctetes, Pseudomalus, Hedychridium, Hedychrum, Holopyga, Chrysidea, Chrysis, Euchroeus, Chrysura, Pseudochrysis, Spinolia, Spinolia, including species rare and new for the fauna of the North Caucasus and Russia. By the nature of the population dynamics, five groups of cuckoo wasps were identified: spring – represented by 7 species from 4 genera; spring-summer – 76 species from 10 genera; summer – 113 species from 16 genera; summer-autumn – 4 species from 2 genera and spring-summer-autumn – 5 species from 3 genus. According to the duration of flight, eurychronous species of cuckoo wasps were identified, which are found throughout the season from spring to autumn; mesochronous – the years of which affect the end of May and summer months and stenochronous – confined to a short period of time. Eurychronic accounted for 2.4%, mesochronous 24.9%, stenochronic 72.7%. The number of generations of cuckoo wasps is related to the dynamics of the number of the host. In the mountains, the peaks of activity shift towards the middle of summer, most species have one peak of activity; due to the frequent changes in weather conditions in the mountains, the phenological characteristics of the cuckoo wasps and their hosts do not coincide in terms with the lowland populations and the periods of activity can be extended in time. Phenological characteristics of rare and new species for the fauna of the North Caucasus and Russia are presented for the first time. The data obtained expand the understanding of the biodiversity and dynamics of the abundance of cuckoo wasps in the North Caucasus and can be used for environmental protection measures and rational nature management in the south of Russia.

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