35 research outputs found

    Demography of some non-native isopods (Crustacea, Isopoda, Oniscidea) in a Mid-Atlantic forest, USA

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    Introduced species dominate the terrestrial isopod fauna in most inland habitats of North America, including urban landscapes. These non-native species are often very abundant and thus potentially play a significant role in detritus processing. We monitored isopod assemblages in an urban forest for a year to examine the relationship between surface activity and abiotic environmental factors, and to analyze reproductive characteristics that might contribute to their successful establishment. Using pitfall trap samples we recorded five species, two of which, Trachelipus rathkii and Cylisticus convexus, were highly abundant. We determined size, sex and reproductive state of each individual. Surface activity of both species reflected variability in abiotic stress factors for isopods, such as soil moisture and soil temperature. Early spring the main trigger was soil temperature while later in the season increasing temperature and decreasing soil moisture jointly affected population dynamics. Activity significantly correlated with soil moisture. The temporal pattern of sex ratios supported the secondary sex ratio hypothesis. Males dominated the samples on the onset of the mating season in search of females. The pattern was reversed as females searched for suitable microsites for their offspring. Size independent fecundity decreased as conditions became more stressful late in the season

    A sikeres megtelepedés ökológiai håttere = The ecological background of successful establishment

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    VizsgĂĄltuk epigeikus taxonok megtelepedĂ©sĂ©ben terjedĂ©sĂ©ben, invazĂ­vvĂĄ vĂĄlĂĄsĂĄban szerepet jĂĄtszhatĂł ökolĂłgiai hĂĄttĂ©rtĂ©nyezƑk Ă©s a fajok Ă©letmenet jellemzƑi közti összefĂŒggĂ©seket. MegĂĄllapĂ­tottuk egyes fajok szĂĄrazsĂĄg tƱrĂ©sĂ©t (Collembola, Isopoda); szaporodĂĄsi stratĂ©giĂĄjĂĄt (Oligochaeta, Isopoda); a nƑstĂ©ny mĂ©ret-reproduktĂ­v siker ĂĄltalĂĄnosĂ­thatĂł összefĂŒggĂ©sĂ©t; kategorizĂĄltuk a magyarorszĂĄgi IsopodĂĄkat elterjedĂ©sĂŒk, habitat igĂ©nyĂŒk alapjĂĄn. Ez lehetƑvĂ© teszi Ă©lƑhelyek termĂ©szetessĂ©gi minƑsĂ­tĂ©sĂ©t; ehhez adatlapot kĂ©szĂ­tettĂŒnk, szĂĄmĂ­tĂłgĂ©pes adatbĂĄzist Ă©pĂ­tettĂŒnk; igazoltuk a meghonosodott fajokat antropogĂ©n zavarĂĄs alatt ĂĄllĂł terĂŒleteken. Új, behurcolt Ă©s megtelepedett fajokat mutattunk ki (Baltimore, Budapest; Oligochaeta, Isopoda); megĂĄlapĂ­tottuk, hogy termĂ©szetközeli-urbĂĄn grĂĄdiens mentĂ©n taxonjaink nem a diverzitĂĄs, hanem a fajegyĂŒttesek minƑsĂ©gi összetĂ©telĂ©nek Ă©s a fajok abundancia mintĂĄzatĂĄnak eltĂ©rĂ©sĂ©vel vĂĄlaszolnak (Carabidae, Isopoda); kidolgoztuk a stresszhatĂĄsok morfolĂłgiai alapokon törtĂ©nƑ mĂ©rĂ©sĂ©t a fluktuĂĄlĂł aszimmetria (FA) mĂłdszerĂ©vel (Isopoda); igazoltuk a sikeres fajok földrajzilag szĂ©les elterjedĂ©sĂ©t, több Ă©lƑhely tĂ­pusban Ă©s szĂ©lesebb mikrohabitat skĂĄlĂĄn valĂł megjelenĂ©sĂ©t (Isopoda);Gastropoda elterjedĂ©si adatok hĂĄrom kĂŒlönbözƑ tĂ©rbeli lĂ©ptĂ©kƱ elemzĂ©sĂ©vel megĂĄllapĂ­tottuk a fajok gyakorisĂĄgĂĄĂ©rt felelƑs tĂ©nyezƑket, a lĂ©trejött mintĂĄzatok termĂ©szetvĂ©delmi konzekvenciĂĄit. Kimutattuk a testmĂ©ret fontos szerepĂ©t azok terjedƑ kĂ©pessĂ©gĂ©ben, a terjedĂ©s mĂłdjĂĄban. | Our investigations were targeted towards the relationship between ecological attributes of epigeic taxa playing key role in their dispersal and establishment, and their life history parameters. We determined drought tolerance (Collembola, Isopoda) and reproductive strategy (Oligochaeta, Isopoda) of species; the general relationship between female body size and reproductive success; and we categorised Hungarian isopod species based on their distribution and habitat requirements. This can lead to the assessment of habitat naturalness; to this we have compiled a data sheet, built a database; we proved naturalized species in disturbed anthropogenic habitats. We found new, introduced, and established species (Baltimore, Budapest; Oligochaeta, Isopoda); we showed that along an urban-rural gradient, our taxa respond not via richness, but species composition and abundance patterns (Carabidae, Isopoda); we developed methodology to measure environmental stress through morphology and fluctuating asymmetry (FA; Isopoda); we proved that successful species are geographically widespread and can be found in wider range of habitats and micro-habitats. We studied the correlates of commonness of Gastropoda species, and its nature conservation consequences. We demonstrated the significance of body size in determining dispersal potential and mode of dispersal

    Investigation of insect attraction effect of lamps with different color temperatures = KĂŒlönbözƑ szĂ­nhƑmĂ©rsĂ©kletƱ lĂĄmpĂĄk rovarvonzĂł hatĂĄsĂĄnak vizsgĂĄlata

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    The aim of our research is to analyze the ecological effects of light sources of different colors. Quantity and size of arthropods captured by light traps are continuously recorded by the Zoolog auto sampler, along with temperature and humidity data. By statistically analyzing large amounts of data, it is possible to estimate the amount of biomass removed by different types of lamps from their habitat, to monitor daily and longer-term activity changes, and to analyze the attractiveness of LEDs of different color temperatures. This will also allow conclusions to be drawn for conservation management. ----- KÜLÖNBÖZƐ SZÍNHƐMÉRSÉKLETĆ° LÁMPÁK ROVARVONZÓ HATÁSÁNAK VIZSGÁLATA KutatĂĄsunk cĂ©lja a kĂŒlönbözƑ szĂ­nhƑmĂ©rsĂ©kletƱ fĂ©nyforrĂĄsok ökolĂłgiai hatĂĄsĂĄnak elemzĂ©se. A fĂ©nycsapdĂĄk ĂĄltal bevonzott Ă­zeltlĂĄbĂșak mennyisĂ©gi Ă©s mĂ©retadatait a Zoolog automatikus mintavevƑ folyamatosan rögzĂ­ti, egyĂŒtt a hƑmĂ©rsĂ©klet- Ă©s pĂĄratartalom-adatokkal. Így nagy mennyisĂ©gƱ adat statisztikai elemzĂ©sĂ©vel lehetƑsĂ©g nyĂ­lik a kĂŒlönbözƑ tĂ­pusĂș lĂĄmpĂĄk ĂĄltal Ă©lƑhelyĂŒkrƑl kivonzott biomassza mennyisĂ©gĂ©nek becslĂ©sĂ©re, illetve a napi Ă©s hosszabb tĂĄvĂș aktivitĂĄsvĂĄltozĂĄsok nyomon követĂ©sĂ©re Ă©s a kĂŒlönbözƑ szĂ­nhƑmĂ©rsĂ©kletƱ LED-ek attraktivitĂĄsĂĄnak elemzĂ©sĂ©re. Ez lehetƑvĂ© teszi a termĂ©szetvĂ©delmi kezelĂ©st elƑsegĂ­tƑ következtetĂ©sek levonĂĄsĂĄt is

    Investigation of insect attraction effect of lamps with different color temperatures

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    The aim of our research is to analyze the ecological effects of light sources of different colors. Quantity and size of arthropods captured by light traps are continuously recorded by the Zoolog auto sampler, along with temperature and humidity data. By statistically analyzing large amounts of data, it is possible to estimate the amount of biomass removed by different types of lamps from their habitat, to monitor daily and longer-term activity changes, and to analyze the attractiveness of LEDs of different color temperatures. This will also allow conclusions to be drawn for conservation management. ----- KÜLÖNBÖZƐ SZÍNHƐMÉRSÉKLETĆ° LÁMPÁK ROVARVONZÓ HATÁSÁNAK VIZSGÁLATA KutatĂĄsunk cĂ©lja a kĂŒlönbözƑ szĂ­nhƑmĂ©rsĂ©kletƱ fĂ©nyforrĂĄsok ökolĂłgiai hatĂĄsĂĄnak elemzĂ©se. A fĂ©nycsapdĂĄk ĂĄltal bevonzott Ă­zeltlĂĄbĂșak mennyisĂ©gi Ă©s mĂ©retadatait a Zoolog automatikus mintavevƑ folyamatosan rögzĂ­ti, egyĂŒtt a hƑmĂ©rsĂ©klet- Ă©s pĂĄratartalom-adatokkal. Így nagy mennyisĂ©gƱ adat statisztikai elemzĂ©sĂ©vel lehetƑsĂ©g nyĂ­lik a kĂŒlönbözƑ tĂ­pusĂș lĂĄmpĂĄk ĂĄltal Ă©lƑhelyĂŒkrƑl kivonzott biomassza mennyisĂ©gĂ©nek becslĂ©sĂ©re, illetve a napi Ă©s hosszabb tĂĄvĂș aktivitĂĄsvĂĄltozĂĄsok nyomon követĂ©sĂ©re Ă©s a kĂŒlönbözƑ szĂ­nhƑmĂ©rsĂ©kletƱ LED-ek attraktivitĂĄsĂĄnak elemzĂ©sĂ©re. Ez lehetƑvĂ© teszi a termĂ©szetvĂ©delmi kezelĂ©st elƑsegĂ­tƑ következtetĂ©sek levonĂĄsĂĄt is
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