| the tyrosinase system in the terrestrial isopod, porcellio laevis latreille (rorcellionidae, isopoda). | | 1976 | 5233 |
| a comparative study in porcellio laevis (lat.) and armadillidium vulgare (lat.): response to temperature, photoperiod and oxygen concentration. | relationship of body weight, imposed fasting, temperature, light intensity, and oxygen concentration to oxygen consumption in porcellio laevis and armadillidium vulgare has been investigated in a series of laboratory experiments. it was observed that (1) the metabolic response in the two species to temperature change was a uniform increase of oxygen consumption with increasing temperature from 15 degrees c to 60 degrees c. beyond 30 degrees c, the oxygen consumption in each species fell, and the ... | 1979 | 93887 |
| lactate dehydrogenase isozymes from the woodlouse porcellio laevis latreille (porcellionidae, isopoda): physical & chemical properties. | | 1979 | 540933 |
| haemolymph proteins in porcellio laevis latreille (porcellionidae, isopoda): the molecular weight. | | 1975 | 1204334 |
| characteristics of acid phosphatase in porcellio laevis latreille (porcellionidae, isopoda). | | 1974 | 4212986 |
| phosphomonoesterases of the digestive gut in porcellio laevis latreille (porcellionidae, isopoda). | | 1973 | 4727863 |
| haemolymph pressure regulation in porcellio laevis latr. (porcellionidae, isopoda). | hydrostatic pressure in the haemocoele in porcellio laevis adults ranges between 3.69 to 12.92 mm hg (50 to 175 mm h2o). mechanism involved in haemolymph pressure regulation includes characteristic contractions of intersegmental body musculature. the effects of temperature, humidity, decapitation, destruction of thoracic ganglion, and the injection of insect ringer and eserine into the haemocoele on intersegmental muscular contractions were studied. the significance of these findings is discusse ... | 1981 | 6174087 |
| the effect of magnetic field intensities on the oxygen consumption in porcellio laevis latre (oniscoidea, isopoda). | the effects of the 5 gauss, 50 gauss and 500 gauss magnetic fields on the oxygen consumption in porcellio laevis adults, at soil ph 3.8 and 7.0, were investigated in a series of laboratory experiments. the oxygen consumption was the highest at 5 gauss and ph 3.8, and lowest at 500 gauss and ph 7.0. highest isopod mortality was recorded under all magnetic fields at ph 3.8, and lowest at ph 7.0. the significance of these findings is discussed. | 1982 | 6182849 |
| the sublethal effects and accumulation of cadmium in the terrestrial isopod porcellio laevis latr. (crustacea, isopoda). | this study investigated the sublethal effects of cdso4 on the terrestrial isopod species porcellio laevis and its capacity to accumulate and compartmentalize cadmium. the ability of p. laevis to discriminate between uncontaminated and cdso4-contaminated leaves was also studied. it was shown that sublethal effects in terms of mass changes of exposed isopods occur at cadmium concentrations between 10 and 80 mg/kg. moreover, p. laevis can be considered as a so-called macroconcentrator, accumulating ... | 1999 | 9828263 |
| short-term toxicological effects of cadmium on the woodlouse, porcellio laevis (crustacea, isopoda). | terrestrial isopods have been used in a number of studies as test organisms concerning the effects of chemicals in a (eco-)toxicological context. they are saprophages, which are in direct contact with polluted plant material. cadmium is a metal with no known biological function and is toxic to life. there are a variety of anthropogenic sources of cadmium in the environment. the aims of this study were to determine the lc50 for cadmium sulfate for porcellio laevis and the acute effect of this met ... | 1999 | 10330317 |
| masculinization of female isopods (crustacea) correlated with non-mendelian inheritance of cytoplasmic viruses. | when in genetic females external male characters differentiate, the phenomenon is called "male pseudohermaphroditism." this male differentiation occurs in terrestrial isopods (crustacea, suborder oniscoidea) and sometimes involves only some epithelial areas (gynandromorphous mosaics). it is not induced by male hormones or by abnormal ovary function. this intersexuality is transmitted maternally (by the intersex females) or paternally (by the brothers of intersex females) to between 30% and 60% o ... | 1991 | 11607243 |
| quantifying histopathological alterations in the hepatopancreas of the woodlouse porcellio laevis (isopoda) as a biomarker of cadmium exposure. | the aims of this study were to determine and quantify the effects of cadmium sulfate on the histological structure of the hepatopancreas of porcellio laevis, to determine the extent of the changes due to cadmium exposure, and to assess whether these effects could serve as biomarkers of cadmium exposure. for this purpose, different batches of p. laevis were exposed for 6 weeks to shredded leaves contaminated with a range of different concentrations of cadmium sulfate. histological sections of dif ... | 2003 | 12927564 |
| [effect of roentgen rays on the development of oostegite in porcellio laevis latreille (crust. isopoda)]. | | 1956 | 13446113 |
| [sexual phenoma in isopoda. ii. sexual biology of porcellio laevis]. | | 1958 | 13536042 |
| dietary effects on life history traits in a terrestrial isopod: the importance of evaluating maternal effects and trade-offs. | studies of life history aim to explain patterns in the evolution of reproductive investment, growth, and survival. trade-offs between traits are a fundamental component of life history theory. in herbivorous arthropods life history traits are often responsive to variation in numerous environmental factors, especially diet quality. using three artificial diets under controlled laboratory conditions, we examined changes in life history traits (i.e. growth rate, offspring number, offspring size, in ... | 2004 | 14685846 |
| the energetics of reproduction and parental care in the terrestrial isopod porcellio laevis. | parental care is a behavioral strategy that contributes to increased fitness of progeny. among terrestrial arthropods, many isopods provide extensive parental care. few studies have quantified the underlying cost of parental care in terms of energy. we used the terrestrial woodlouse porcellio laevis (latreille) as a study model to examine how energetic acquisition and expenditure in females is affected during the incubation period and how parental care affects energy balance in this species. we ... | 2004 | 15670860 |
| effects of of habitats and pesticides on aerobic capacity and survival of soil fauna. | faunal health is largely dependent on their soil environment and available litter quality. so the effects of different soil habitats and pesticides on citrate synthase (cs) activity of soil fauna and its population were studied. | 2005 | 16131019 |
| interpopulational variation in recovery time from chill coma along a geographic gradient: a study in the common woodlouse, porcellio laevis. | extreme temperatures restrict the performance of terrestrial arthropods and variations in low temperatures on a latitudinal scale influence physiological variables. recovery time from chill coma is a measure of cold tolerance and it is a good index of climatic adaptation. we tested differences in recovery time of the common woodlouse (porcellio laevis) exposed to different thermal conditions. individuals were sampled from four different populations in chile, spanning a latitudinal range of appro ... | 2005 | 16197957 |
| seasonal variation in heavy metal accumulation in subtropical population of the terrestrial isopod, porcellio laevis. | the aim of the present study is to evaluate the seasonal fluctuation of heavy metals in the isopod porcellio laevis at four uncontaminated subtropical locations. this study was carried out at four different field sites in assiut, egypt. the concentrations of cadmium, lead, copper, and zinc in animal, soil, and litter (mug/g dry weight) were monthly recorded during the period from june 2002 till may 2003. there was little difference in metal accumulation trends between the sites. in general, the ... | 2006 | 16399167 |
| maternal effects, maternal body size and offspring energetics: a study in the common woodlouse porcellio laevis. | what are the consequences of the natural variation in maternal body mass on offspring energetic performance? how are performance traits related to thermal physiology and energetics phenotypically integrated on offspring? to answer these questions, fifty breeding pairs of the common terrestrial isopod porcellio laevis were set up in the lab. physiological performance, thermal tolerance and thermal sensitivity were measured in f1 adults. maternal effects were estimated as: the direct influence of ... | 2007 | 17276116 |
| quantitative assessment of effects of zinc on the histological structure of the hepatopancreas of terrestrial isopods. | the objective of this study was to quantify the effects of zinc exposure on the histological structure of the hepatopancreas of porcellio laevis. woodlice were experimentally exposed to various concentrations (1000, 4000, and 8000 mg. kg(-1)) of zinc sulphate. hepatopancreas samples of exposed isopods were histologically prepared and analysed with leica qwin image analysis software. the b-cells in hepatopancreases of zinc sulphate - exposed woodlice were reduced in size to varying degrees, compa ... | 2007 | 17612782 |
| ultrastructural organization of seminal receptacle and sperm storage in porcellio laevis latreille (crustacea: isopoda oniscidea). | the seminal receptacle of porcellio laevis is a specialized region of the genital tract placed at the confluence of the oviduct with the ovary. in virgin sexually mature females the seminal receptacle wall consists of a monolayered epithelium lying on a thin basal lamina and delimiting a narrow and anfractuous lumen. the cells are joined by cell junctions only in their apical portion and do not show marked secretory activity; numerous cells appear to undergo a partial or complete process of auto ... | 1998 | 18627848 |
| conservation of arthropod midline netrin accumulation revealed with a cross-reactive antibody provides evidence for midline cell homology. | although many similarities in arthropod cns development exist, differences in axonogenesis and the formation of midline cells, which regulate axon growth, have been observed. for example, axon growth patterns in the ventral nerve cord of artemia franciscana differ from that of drosophila melanogaster. despite such differences, conserved molecular marker expression at the midline of several arthropod species indicates that midline cells may be homologous in distantly related arthropods. however, ... | 2009 | 19469853 |
| the effects of temperature, desiccation, and body mass on the locomotion of the terrestrial isopod, porcellio laevis. | locomotion in terrestrial isopods is strongly influenced by body size and by abiotic factors. we determined the speeds of isopods of differing masses within a linear racetrack at temperatures ranging from 15 to 35 degrees c. we also predicted maximum speeds based on the froude number concept as originally applied to vertebrates. in addition we used a circular thermal gradient to examine the temperature preferences of isopods, and we measured the effects of desiccation on locomotion. measured spe ... | 2009 | 19535030 |
| effect of cadmium on haemocyte viability of the woodlouse porcellio laevis (isopoda, crustacea). | this study investigated the effects of cadmium on haemocyte viability of the woodlouse porcellio laevis, using the trypan blue exclusion assay. the ultimate aim is to determine the usefulness of this cellular response as biomarker of cadmium exposure. results showed that exposure to sublethal concentrations of cadmium, with concomitant cadmium accumulation in the body, significantly lowered the percentages of viable haemocytes in p. laevis. this response was already observed after the first week ... | 2009 | 19585063 |
| impact of experimental thermal amplitude on ectotherm performance: adaptation to climate change variability? | global climate change is one of the greatest threats to biodiversity; one of the most important effects is increase in the mean earth surface temperature. however, another but poorly studied main effect of global change appears to be an increase in temperature variability. most of the current analyses of global change have focused on mean values, paying less attention to the role of the fluctuations of environmental variables. we tested the effects of daily thermal amplitude with constant mean ( ... | 2009 | 19622394 |
| an experimental test of the role of environmental temperature variability on ectotherm molecular, physiological and life-history traits: implications for global warming. | global climate change is one of the greatest threats to biodiversity; one of the most important effects is the increase in the mean earth surface temperature. however, another but poorly studied main characteristic of global change appears to be an increase in temperature variability. most of the current analyses of global change have focused on mean values, paying less attention to the role of the fluctuations of environmental variables. we experimentally tested the effects of environmental tem ... | 2011 | 21406244 |
| bioaccumulation of cadmium and lead and its effects on hepatopancreas morphology in three terrestrial isopod crustacean species. | this study was designed to compare cadmium (cd) and lead (pb) bioaccumulation in three species of oniscidean isopods - armadillidium granulatum brandt, armadillidium vulgare (latreille) and porcellio laevis latreille which were exposed for three weeks to a contaminated diet, and to determine the morphological and ultrastructural changes in hepatopancreas. metal accumulation, determined by inductively coupled plasma mass spectrometry (icp-ms), was linearly associated with the exposed concentratio ... | 2014 | 25279851 |
| do predator cues influence turn alternation behavior in terrestrial isopods porcellio laevis latreille and armadillidium vulgare latreille? | terrestrial isopods (crustacea: oniscidea) make more alternating maze turns in response to negative stimuli, a navigational behavior that corrects divergence from a straight line. the present study investigates this behavioral pattern in two species, porcellio laevis latreille and armadillidium vulgare latreille, in response to short-term vs. long-term exposure to indirect cues from predatory ants. neither isopod species increased the number of alternating turns in response to short-term indirec ... | 2014 | 24954552 |