The dynamics of natural populations of a phytophagous lady beetle,Henosepilachna pustulosa (Kôno) under different habitat conditions

1981 ◽  
Vol 23 (1) ◽  
pp. 94-115 ◽  
Author(s):  
Takayuki Ohgushi ◽  
Hiroichi Sawada
Keyword(s):  
Natural Populations ◽  
Lady Beetle ◽  
Habitat Conditions

scholarly journals Epigenetic Differentiation of Natural Populations of Lilium bosniacum Associated with Contrasting Habitat Conditions

2018 ◽  
Vol 10 (1) ◽  
pp. 291-303 ◽  
Author(s):  
Vlatka Zoldoš ◽  
Ivan Biruš ◽  
Edina Muratović ◽  
Zlatko Šatović ◽  
Aleksandar Vojta ◽  
...  
Keyword(s):  
Natural Populations ◽  
Habitat Conditions ◽  
Lilium Bosniacum

scholarly journals Populations of Cephalanthera damasonium (Mill.) Druce on the hills of the right bank of the River Dnieper (in Forest Steepe vegetation of Ukraine)

2020 ◽  
Vol 8 (2) ◽  
pp. 12-20
Author(s):  
lgor V. Solomakha ◽  
Vasyl L. Shevchyk ◽  
Iryna A. Tymchenko ◽  
Volodymyr A. Solomakha ◽  
Tetyana S. Dvirna
Keyword(s):  
Total Population ◽  
Natural Populations ◽  
Tree Plantations ◽  
Forest Steppe ◽  
Habitat Conditions ◽  
Eastern Border ◽  
The Right ◽  
Number Of Individuals ◽  
Cephalanthera Damasonium ◽  
Study Species

AbstractAs a result of studying the vegetation cover of artificial (possibly spontaneous) tree plantations on the hills of the right bank of the River Dnieper in the Forest-Steppe of Ukraine we discovered the formation of natural populations of Cephalanthera damasonium (Mill.) Druce. Information on the growth of this species was previously presented (more than 80 years ago) by F. Gryn (samples of which are in The National Herbarium of Ukraine, Kiev), who noted its distribution in these locations. The ecological and coenotic features of the distribution of this species as a part of available populations in the communities of classes Carpino-Fagetea sylvaticae, Quercetea pubescentis, Crataego-Prunetea, Alno glutinosae-Populetea albae have been studied. The largest eight new populations of C. damasonium have been identified on the eastern border of Ukraine. Habitat conditions, number and structure of all new populations were determined. Micropopulations of the species occupy an area from several to 750 m2 with a total population of more than 1,200 specimens. The ontogenetic spectrum is right-sided, with a dominance of generative individuals, and their share is 4/5 of the total number of individuals. The peculiarity of this locality is the high number of individuals in most of these populations, which may be due to favourable ecological-coenotic conditions and the absence of intensive anthropogenic influences. The identified habitats of the study species need protection.

scholarly journals Ecological-phytocenotic confinement and seasonal rhythm of development of Paeonia anomala L. in East Kazakhstan

2021 ◽  
Vol 103 (3) ◽  
pp. 80-86
Author(s):  
Seril Kubentayev ◽  
◽  
Yuri Kotukhov ◽  
Klara Serzhankyzy Izbastina ◽  
Aisulu Karimkazhyevna Sarkytbayeva ◽  
...  
Keyword(s):  
Competitive Ability ◽  
Raw Materials ◽  
Natural Populations ◽  
Limiting Factors ◽  
Absolute Maximum ◽  
Habitat Conditions ◽  
Seasonal Rhythm ◽  
Biological Features ◽  
East Kazakhstan ◽  
River Valleys

The article describes the ecological and biological features, phytocenotic structure and seasonal rhythm of development of Paeonia anomala L. populations on the territory of Kazakhstan Altai in the East Kazakhstan region. According to the research results, the regularities of the species confinement to the ecological and geomorphological conditions of the habitat were revealed, the limiting factors determining the rarity of the species were identified and recommendations were given for the preservation of the natural populations of the species. It was found that P. anomala in the studied region grows on steep forest and shrub slopes of northern exposure, overgrown kurums, bottoms of inter-montane ravines, river valleys at an altitude range of 700–1850 m above sea level. The most optimal habitat conditions for P. anomala are cedar-larch sparse forests. The age spectrum of the Paeonia anomala populations is characterized by the absolute maximum of generative individuals. Populations in thickened forest and shrub habitats on the southwestern micro-slopes are in unfavorable ecological conditions for the species. The limiting factors that determine the rarity of seeing are the collection of bouquets, the procurement of medicinal raw materials, grazing and the low competitive ability of seedlings in the early stages of development, as well as the massive destruction of seeds by rodents. To preserve the natural populations of the peony evading in Western Altai, it is necessary to strictly protect the species from being cut into bouquets, prohibit the procurement of medicinal raw materials, as well as develop industrial technologies for growing the species in culture.

AN AGENT-BASED APPROACH TO MODELING MAMMALIAN EVOLUTION: HOW RESOURCE DISTRIBUTION AND PREDATION AFFECT BODY SIZE

2012 ◽  
Vol 15 (01n02) ◽  
pp. 1150014
Author(s):  
ANNE KANDLER ◽  
JEROEN B. SMAERS
Keyword(s):  
Body Size ◽  
Resource Distribution ◽  
Natural Populations ◽  
Size Variation ◽  
Population Level ◽  
Habitat Conditions ◽  
Agent Based ◽  
Body Size Variation ◽  
Individual Decisions ◽  
Independent Effects

Macro-evolutionary investigations into cross-scale patterns of body size variation have put many of the pieces of the evolutionary body size puzzle in place. To further tackle micro- and meso-scale process-based reasons underlying changes in body size, researchers compare natural populations across different habitat structures, assessing which habitat structures correspond to which changes in body size variation. The complex multi-scale dynamics underlying the effect of the external environment on body size evolution, however, inherently limits empirical interpretations with regard to the differential contribution of particular aspects of habitat architecture on body size variation, leaving open many questions as to the how and why of changes in body size variation across different habitats. We develop an agent-based simulation approach with the principal aim of investigating the differential effects of particular habitat conditions on the evolution of body size and other life history traits. Our approach simulates animals' individual decisions with regard to growth and reproduction, and records their effect on population-level variation across different habitat structures. This approach has the potential to include numerous different habitat conditions and/or growth laws and allows detailed controlled comparisons of the isolated effects of particular habitat conditions and/or perturbations. In the current study, we assess the usefulness of our approach in a pilot exploration of the effects of predation and resource distribution on body size variation in mammals. We find independent effects of predation, resource availability and resource predictability on changes in body size and quantify the relation between body size and population size across different habitat conditions.

High-voltage electron microscopy of maxillary gland of spirochete-infected brine shrimp: lesion of efferent tubule

1988 ◽  
Vol 46 ◽  
pp. 362-363
Author(s):  
G. E. Tyson ◽  
M. J. Song
Keyword(s):  
Electron Microscopy ◽  
High Voltage ◽  
Brine Shrimp ◽  
Natural Populations ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
High Voltage Electron Microscopy ◽  
Voltage Electron ◽  
High Voltage Electron ◽  
Infected Adult

Natural populations of the brine shrimp, Artemia, may possess spirochete- infected animals in low numbers. The ultrastructure of Artemia's spirochete has been described by conventional transmission electron microscopy. In infected shrimp, spirochetal cells were abundant in the blood and also occurred intra- and extracellularly in the three organs examined, i.e. the maxillary gland (segmental excretory organ), the integument, and certain muscles The efferent-tubule region of the maxillary gland possessed a distinctive lesion comprised of a group of spirochetes, together with numerous small vesicles, situated in a cave-like indentation of the base of the tubule epithelium. in some instances the basal lamina at a lesion site was clearly discontinuous. High-voltage electron microscopy has now been used to study lesions of the efferent tubule, with the aim of understanding better their three-dimensional structure.Tissue from one maxillary gland of an infected, adult, female brine shrimp was used for HVEM study.

Effect of acid deposition on trichome morphology and dogwood anthracnose biology

1992 ◽  
Vol 50 (1) ◽  
pp. 840-841
Author(s):  
Kyle T. Thornham ◽  
R. Jay Stipes ◽  
Randolph L. Grayson
Keyword(s):  
Acid Deposition ◽  
Disease Incidence ◽  
Natural Populations ◽  
Tree Disease ◽  
Flowering Dogwood ◽  
Discula Destructiva ◽  
Disease Induction ◽  
Dogwood Anthracnose ◽  
Trichome Morphology ◽  
Precipitation Events

Dogwood anthracnose, caused by Discula destructiva (1), is another new catastrophic tree disease that has ravaged natural populations of the flowering dogwood (Cornus florida) in the Appalachians over the past 15 years, and the epidemic is prognosticated to continue (2). An estimated 9.5 million acres have been affected, primarily in the Appalachian Mountains, from VA southwards, alone, and an estimated 50% of all dogwoods in PA have been killed. Since acid deposition has been linked experimentally with disease induction, and since the disease incidence and severity are more pronounced at higher elevations where lower pH precipitation events occur, we investigated the effect of acidic foliar sprays on moiphologic changes in the foliar cuticle and trichomes (3), the initial sites of infection and foci of Discula sporulation.

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