BazTech - Yadda

1

Oviposition preferences of the alcon large blue phengaris alcon (Lepidoptera: Lycaenidae) at a seasonal lake in Southwestern Slovenia

Jugovic Jure, Kostadinovski Luka, Kopač Klara

Polish Journal of Ecology

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2023

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Vol. 71, nr 1

15--25

EN

We investigated the oviposition preferences of Phengaris alcon in relation to the height of the host plant (Gentiana pneumonanthe), the number of flowers, and the choice of microsite for oviposition (part of the host plant, height of oviposition) in a local population of this species in SW Slovenia at a depression of a seasonal lake Petelinje. P. alcon prefers the tallest (most conspicuous) host plants and plants with a larger number of flowers (i.e., more than 90% of all eggs were deposited on 12% of the tallest plants ≥ 30 cm), where eggs are deposited in the upper quarter of the plant height, usually on calyx (66.1%) and corolla (29.9%), and rarely on leaves or stems. Eggs are mostly deposited singly or in groups of two (> 50%) on a single plant, and eggs were found only on less than 3% of examined plants. Butterfly density was estimated at about 60 individuals per hectare. Obtained results indicate that preferences for oviposition sites are not random, and monitoring population density may provide important insight into the future population status of P. alcon.

2

Monitoring wild boar (Sus scrofa) populations

Sporek M., Wilhelm M.

Proceedings of ECOpole

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2017

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Vol. 11, No. 2

415--420

EN

The aim of the study was to assess the size of wild boar (Sus scrofa) population with reference to its age and gender structure. The population size was monitored using camera traps. The observations were conducted between May 2015 and June 2016 in western Poland, Opole region, Proszkow Forest District, hunting ground No. 48. Seasonal variations in the frequency of detecting individuals representing specific age and gender classes were reflected in the composition and size of observed sounders. Annual observations with the camera traps allowed for a prediction of changes in the population size in future seasons. The prediction was based on the number of squeakers observed over consecutive months.

PL

Celem pracy była ocena liczebności populacji dzika (Sus scrofa) z uwzględnieniem struktury wiekowo-płciowej. Badania przeprowadzono na podstawie monitoringu z wykorzystaniem fotopułapek. Obserwacje prowadzono od maja 2015 do czerwca 2016 roku w zachodniej części Polski na terenie Opolszczyzny w Nadleśnictwie Prószków, w obwodzie łowieckim Nr 48. Sezonowe wahania częstości bytowania osobników reprezentujących poszczególne klasy wiekowo-płciowe były zauważalne w składzie i wielkościach pojawiających się watah. Prowadzenie rocznych obserwacji za pomocą fotopułapek pozwala przewidywać tendencję zmian wielkości pogłowia w przyszłych sezonach na podstawie liczebności pasiaków. Z kolei zarejestrowane na nęcisku młode pasiaki w okresie późnego lata (sierpień, wrzesień) świadczą o zaburzeniach rozrodu.

3

Analiza wpływu wybranych parametrów algorytmu genetycznego w problemie identyfikacji modelu tłumika MR

Rutczyńska-Wdowiak K., Makowski M.

Logistyka

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2012

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nr 3

PL

Praca jest poświęcona identyfikacji parametrów modelu sterowanego tłumika magneto-reologicznego (MR) oraz eksperymentalnej weryfikacji modelu tłumika. Model urządzenia został opracowany w postaci struktury reologicznej. Do badań numerycznych opracowany został matematyczny model opisujący zjawiska zachodzące w tłumiku. W pracy zostały przedstawione wyniki badań symulacyjnych i eksperymentalnych własności sterowanego tłumika MR. Parametry modelu tłumika MR wyznaczone w identyfikacji przy użyciu wybranego algorytmu genetycznego wykazują największą zbieżność wyników badań symulacyjnych z badaniami eksperymentalnymi. Analizowano wpływ rozmiaru populacji oraz zadanych przestrzeni poszukiwań rozwiązania algorytmu genetycznego na wyniki procesu identyfikacji.

EN

In this paper, a mathematical model of a magneto-rheological damper is presented. Moreover, identification of model parameters is described and compared with results of direct experiment. Device model was developed as a rheological structure. Set of mathematical equations was used to describe the phenomena occurring in the MR damper. In this paper are also presented results of numerical and experimental studies. Parameters of the damper model MR appointed in the identification with the use of the chosen genetic algorithm show the greatest convergence of simulation results with experimental research. The influence of the population size and the search space of solution of the genetic algorithm on results of the identification was analysed.

4

Demography of a common butterfly on humid grasslands : Argynnis aglaja (Lepidoptera: Nymphalidae) studied by mark-recapture

Zimmermann K., Konvicka M., Fric Z., Cihakova V.

Polish Journal of Ecology

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2009

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Vol. 57, nr 4

715-727

EN

Much of the research into the demography of butterflies conducted in Europe during the last few decades focused on rapidly declining or, on the other hand, expanding species, whereas species with stable trend tend to be neglected by researchers. Argynnis aglaja, a widely distributed inhabitant of semi-natural grasslands, represents a suitable model for studying patterns of landscape persistence of not-yet-threatened grassland insects. Using mark-recapture method conducted for one season on humid meadows in Western Bohemia, Czech Republic, we show that this large-bodied species is capable to form large and dense populations, reaching densities of over 250 individuals per hectare. The adults were relatively long-living, an average female longevity (11.8 d) was over twice as high as an average male longevity (4.6 d), with maxima being 22 (a male) and 30 (a female) days. The prolonged female lifespan is beneficial for a species that do not emerge with fully-matured eggs and oviposits singly over large areas. Modelling mobility, well-approximated by an inverse-power function, predicted that about one individual in a thousand would cross the distance of 1000 meters. We conclude that the satisfactory conservation status of A. aglaja stems from its capability to reach high local densities combined with a good dispersal power.