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From trees to fleas: masting indirectly affects flea abundance on a rodent host

Integrative Zoology 2023年第3期18卷 440-452页

作者： Ivan BALÁŽ MichałBOGDZIEWICZ sylwia dziemian-zwolak Carlotta LO PRESTI Aleksandra WRÓBEL Milena ZDUNIAK Rafałzwolak Faculty of Natural Sciences and Informatics Constantine the Philosopher University in NitraNitraSlovakia Department of Systematic Zoology Adam Mickiewicz University in Pozna´nPozna´nPoland INRAE LESSEMUniversity Grenoble AlpesSaint-Martind’HèresFrance University of Catania CataniaItaly Department of Zoology Pozna´n University of Life SciencesPozna´nPoland

Mast seeding causes strongﬂuctuations in populations of forest ***,this phenomenon can be used as a natural experiment to examine how variation in host abundance affects parasite *** investigatedﬂeas infesting yellow-necked mice in beech forest after 2 mast and 2 non-mast *** tested 2 mutually exclusive scenarios:(1)as predicted by classical models of density-dependent transmission,an increase in host density will cause an increase in ectoparasite abundance(deﬁned as the number of parasites per host),versus(2)an increase in host density will cause a decline inﬂea abundance(“dilution,”which is thought to occur when parasite population growth is slower than that of the host).In addition,we assessed whether masting alters the relationship between host traits(sex and body mass)andﬂea *** found a hump-shaped relationship between host andﬂea ***,the most basic predictions are too simple to describe ectoparasite dynamics in this *** addition,masting modiﬁed seasonal dynamics ofﬂea abundance,but did not affect the relationship between host traits andﬂea abundance(individuals with the highest body mass hosted the mostﬂeas;after controlling for body mass,parasite abundance did not vary between sexes).Our results demonstrate that pulses of tree reproduction can indirectly,through changes in host densities,drive patterns of ectoparasite infestation.

关键词： Apodemusﬂavicollis Fagus sylvatica indirect effects pulsed resources Siphonaptera

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Effect of gear teeth finishing method on properties of teeth surface layer and its resistance to pitting wear creation

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Journal of Central South University 2016年第1期23卷 68-76页

作者： Jan zwolak Arkadiusz Palczak Department of Mechanics and Mechanical Engineering Faculty of Mathematics and Natural Sciences The University of Rzeszow Rejtana Ave. 16C Rzeszow 35-959 Poland

This work presented the characteristics of two gear teeth finishing methods, due to the properties of gear teeth surface layer obtained at the tooth working depth. These methods are: 1) the teeth carburization, hardening to a hardness of HRC 60-62 and then grinding, 2) the soft gear shaving as the final mechanical treatment and then carburizing and hardening to the hardness of HRC60-62. This work included the test results of the contact fatigue strength carried out on the circulating power system. The Wohler curves were plotted due to the obtained results, as the basis for the practical evaluation of the considered gear finishing methods. The parameters like volume distribution of the voids, content of the retained austenite, compressive residual stress value, but also the results of contact fatigue strength tests, are more favorable for the teeth shaving method than for the teeth grinding method.

关键词： gear teeth finishing treatment surface layer contact fatigue strength pitting

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Deciphering the effects of disperser assemblages and seed mass on patterns of seed dispersal in a rodent community

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Integrative Zoology 2017年第6期12卷 457-467页

作者： Aleksandra WRÓBEL Rafal zwolak Department of Systematic Zoology Institute of Environmental BiologyAdam Mickiewicz UniversityPoland

The sizes of both seed dispersers and seeds are traits that are likely to interact to influence seed fate in many synzoochoric plant ***,we examined whether members of a granivorous rodent community consisting of species of different body size vary in their effectiveness as seed dispersers,and how this relationship may be altered by seed *** marked northern red oak(Quercus rubra)acorns with plastic tags and placed them in size-selective rodent *** exclosures allowed differential access of rodent groups based on different body size:(i)small(*** spp.);(ii)small and medium(*** striatus);and(iii)small,medium and large(*** carolinensis)species of *** removal did not differ among exclosure types,but more seeds were missing when removed by small rodents,probably because of *** treatments did not influence the relative frequency of acorn ***,small rodents cached considerably fewer and partially ate more acorns than the other 2 *** mean dispersal distance was the longest for cages with medium openings,intermediate for cages with large openings and the shortest for cages with small *** mass positively affected the probability of caching and this relationship was unaffected by exclosure *** conclusion,granivorous rodents of different body sizes strongly differed in their interactions with acorns,with small rodents acting primarily as acorn predators and medium and large species contributing significantly more to dispersal of red oaks.

关键词： acorn dispersal initial seed fate plant-animal interactions rodent community scatterhoarding

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Invasive oaks escape pre-dispersal insect seed predation and trap enemies in their seeds

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Integrative Zoology 2018年第3期13卷 228-237页

作者： MichałBOGDZIEWICZ Raul BONAL Josep MESPELTA Ewa M.KALEMBA Michael A.STEELE Rafałzwolak Department of Systematic Zoology Faculty of BiologyAdam Mickiewicz UniversityPoznańPoland CREAF Cerdanyola del VallesCataloniaSpain Forest Research Group INDEHESAUniversity of ExtremaduraPlasenciaSpain DITEG Research Group University of Castilla-La ManchaToledoSpain Laboratory of Seed Biochemistry Institute of DendrologyPolish Academy of SciencesKórnikPoland Department of Biology Wilkes UniversityWilkes-BarrePennsylvaniaUSA

Species introduced to habitats outside their native range often escape control by their natural *** competing with native species,an alien species might also affect the native herbivores by introducing a new source of different quality ***,we describe the case of northern red oak(Quercus rubra)invasion in *** collected data on insect(moth Cydia *** weevil Curculio spp.)seed predation of northern red oak in its native(USA,North America)and invasive(Poland,Europe)range,as well as for sessile oaks(Quercus petrea)in *** also evaluated the quality of acorns as hosts for weevil larvae by collecting infested acorns and measuring weevil developmental success,and quantifying acorn traits such as seed mass,tannins,lipids and protein *** used DNA barcoding to identify insects to the species *** predation by moths was similar and very low in both species and in both ***,red oaks escape pre-dispersal seed predation by weevils in *** infestation rates of northern red oak acorns in their invasive range were 10 times lower than that of sessile oaks,and also 10 times lower than that of red oaks in North ***,even when weevils oviposited into northern red oaks,the larvae failed to develop,suggesting that the exotic host created a trap for the *** phenomenon might gradually decrease the local abundance of the seed predator,and further aid the invasion.

关键词： biotic invasions ecological trap enemy release hypothesis seed predation weevils

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唑来膦酸负荷骨水泥对骨巨细胞瘤、多发性骨髓瘤及肾细胞癌细胞系的毒性作用研究

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中国骨科临床与基础研究杂志 2011年第4期3卷 285-285页

作者： zwolak P Manivel JC Jasinski P 杨涛

对于骨巨细胞瘤、多发性骨髓瘤及肾细胞癌骨转移患者而言,病灶刮除术后的局部再次复发以及随之而来的骨质破坏是较难处理的问题。而双磷酸盐类药物唑来膦酸具有降低破骨细胞活力的作用,因此对于富含破骨细胞的骨巨细胞瘤来说,唑来膦酸... 详细信息

对于骨巨细胞瘤、多发性骨髓瘤及肾细胞癌骨转移患者而言,病灶刮除术后的局部再次复发以及随之而来的骨质破坏是较难处理的问题。而双磷酸盐类药物唑来膦酸具有降低破骨细胞活力的作用,因此对于富含破骨细胞的骨巨细胞瘤来说,唑来膦酸的局部应用具有潜在的治疗功效。本研究分析从聚甲基丙烯酸甲酯骨水泥上释放的唑来膦酸的洗脱动态,并对其体外抗肿瘤效果进行研究。

关键词：聚甲基丙烯酸甲酯骨水泥骨巨细胞瘤多发性骨髓瘤唑来膦酸肾细胞癌毒性作用癌细胞系双磷酸盐类药物

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