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61.
Petr Procházka Hana Konvičková-Patzenhauerová Milica Požgayová Alfréd Trnka Václav Jelínek Marcel Honza 《Die Naturwissenschaften》2014,101(5):417-426
Egg rejection belongs to a widely used host tactic to prevent the costs incurred by avian brood parasitism. However, the genetic basis of this behaviour and the effect of host age on the probability of rejecting the parasitic egg remain largely unknown. Here, we used a set of 15 polymorphic microsatellite loci, including a previously detected candidate locus (Ase64), to link genotypes of female great reed warblers (Acrocephalus arundinaceus), a known rejecter, with their egg rejection responses in two host populations. We also tested whether host female age, as a measure of the experience with own eggs, plays a role in rejection of common cuckoo (Cuculus canorus) eggs. We failed to find any consistent association of egg rejection responses with host female genotypes or age. It seems that host decisions on egg rejection show high levels of phenotypic plasticity and are likely to depend on the spatiotemporal variation in the parasitism pressure. Future studies exploring the repeatability of host responses towards parasitic eggs and the role of host individual experience with parasitic eggs would greatly improve our understanding of the variations in host behaviours considering the persistence of brood parasitism in host populations with rejecter phenotypes. 相似文献
62.
From data on allozyme, nuclear DNA and mitochondrial DNA markers, we show that the originally North Pacific/Northwest Atlantic mussel Mytilus trossulus is widespread on North European coasts, earliM. trossuluser thought to be inhabited only by Mytilus edulis. Several local occurrences of , interspersed with a dominant M. edulis, were recorded on the North Sea, Norwegian Sea and Barents Sea coasts of Norway and the Barents and White Sea coasts of Kola Peninsula in Russia. The proportion of M. trossulus genetic background observed at any one site varied from 0 to 95%. These new occurrences are not related to the previously known, introgressed M. trossulus population that occupies the Baltic Sea. The new northern occurrences retain both the F and M M. trossulus mitochondria, which have been lost from the Baltic stock. While hybridization takes place wherever M. trossulus and M. edulis meet, the extent of hybrization varies between the different contact areas. Hybrids are rare, and the hybrid zones are bimodal in the northern areas; more interbreeding has taken place further south in Norway, but even there genotypic disequilibria are higher than those in the steep transition zone between the Baltic mussel and M. edulis: there is no evidence of a collapse toward a hybrid swarm unlike in the Baltic. The Barents and White Sea M. trossulus are genetically slightly closer to the NW Atlantic than NE Pacific populations, while the Baltic mussel has unique features distinguishing it from the others. We postulate that the presence of M. trossulus in Northern Europe is a result of repeated independent inter- or transoceanic cryptic invasions of various ages, up to recent times. 相似文献
63.
Ivan Jarić Céline Bellard Ricardo A. Correia Franck Courchamp Karel Douda Franz Essl Jonathan M. Jeschke Gregor Kalinkat Lukáš Kalous Robert J. Lennox Ana Novoa Raphaël Proulx Petr Pyšek Andrea Soriano–Redondo Allan T. Souza Reut Vardi Diogo Veríssimo Uri Roll 《Conservation biology》2021,35(2):447-451
64.
Robert Tropek Ilona Cerna Jakub Straka Petr Kocarek Igor Malenovsky Filip Tichanek Pavel Sebek 《Environmental science and pollution research international》2016,23(14):13653-13660
Recently, fly ash deposits have been revealed as a secondary refuge of critically endangered arthropods specialised on aeolian sands in Central Europe. Simultaneously, these anthropogenic habitats are well known for their negative impact on human health and the surrounding environment. The overwhelming majority of these risks are caused by wind erosion, the substantial decreasing of which is thus necessary. But, any effects of anti-dust treatments on endangered arthropods have never been studied. We surveyed communities of five arthropod groups (wild bees and wasps, leafhoppers, spiders, hoverflies and orthopteroid insects) colonising three fly ash deposits in the western Czech Republic. We focused on two different anti-dust treatments (~70 and 100 % cover of fly ash by barren soil) and their comparison with a control of bare fly ash. Altogether, we recorded 495 species, including 132 nationally threatened species (eight of them were considered to be extinct in the country) and/or 30 species strictly specialised to drift sands. Bees and wasps and leafhoppers contained the overwhelming majority of species of the highest conservation interest; a few other important records were also in spiders and orthopteroids. Total soil cover depleted the unique environment of fly ash and thus destroyed the high conservation potential of the deposits. On the other hand, partial coverage (with ~30 % of bare fly ash) still offered habitats for many of the most threatened species, as we showed by both regression and multivariate analyses, with a decrease of wind erosion. This topic still needs much more research interest, but we consider mosaic-like preservation of smaller spots of fly ash as one of the possible compromises between biodiversity and human health. 相似文献
65.
Marcela Nováková Barbora Vašáková Hana Kutalová Katarina Galeštoková Klára Průšová Petr Šmilauer Radim Šumbera Daniel Frynta 《Behavioral ecology and sociobiology》2010,64(3):371-379
Spiny mice of the genus Acomys (Muridae) represent a very suitable mammalian model for studying factors influencing the secondary sex ratio (SSR). The maternal
effort in these rodents is extremely biased in favour of the prenatal period and, therefore, maternal manipulation of the
SSR is potentially more advantageous. We studied the SSR in four populations/species of spiny mice kept in family groups consisting
of two closely related females, one non-relative male and their descendants. The groups were established from founding animals
aged about 3 months (maturing age) and were allowed to breed freely for several months. Each litter was sexed after birth,
and relevant data were thoroughly recorded. Altogether, data were collected on 1684 litters: 189 of Acomys sp. from Iran, 203 of A. cilicicus, 875 of A. cahirinus, and 417 of A. dimidiatus. We recorded the sex of 4048 newborns of which 1995 were males and 2053 were females. The overall sex ratio was close to
1:1 (49.2%). Generalized linear mixed models and/or generalized linear models were constructed to evaluate the effect of four
life history and eight social variables on the sex ratio. No consistent effects of these variables on the sex ratio were found
and, interestingly, none of the variables associated with maternal life history had any effect on the sex ratio. Three factors
associated with group composition (i.e. the number of immature males, the number of immature females and the number of breeding
females) did have significant effects on the sex ratio, but these effects were not consistent across the studied species.
In conclusion, our evaluation of this large dataset revealed that the sex ratio in spiny mice is surprisingly stable. 相似文献
66.
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68.
Ivana Kališová-Špirochová Jana Punčochářová Zdeněk Kafka Martin Kubal Petr Soudek Tomáš Vaněk 《Water, Air, & Soil Pollution: Focus》2003,3(3):269-276
The aim of the project is to study heavy metals accumulation by the selected plants in both laboratory and field conditions. Within the experiments the aspen (Populus tremula × tremuloides), sunflower (Helianthus annuus) and corn (Zea mays) plants were studied. The reasons for this selection were: a fast growth of these plants, an accumulation capacity and an ability to survive in different types of soils. The study was carried out on the aspen plantlets grown in vitro. The plants were exposed to the aqueous solutions having concentrations 0.1 mM, 0.5 mM of Pb2+ or Ni2+, respectively. The accumulation capacityfor aspen, was about 70% of Pb2+ originally present in the solution. The starting concentration of Pb2+ (0.5 mM) exhibited no negative impact on the growth. Besides in vitro expositions, a pilot-scale phytoremediation experiment was carried out at the polluted industrial area (Zn – 75000 mg/kg), (Pb – 16000 mg/kg), (Cr – 590 mg/kg), (Cd – 90 mg/kg) and (Cu – 1700 mg/kg). 相似文献
69.
70.
Lucia Filova Jiri Vojar Kamila Svobodova Petr Sklenicka 《Journal of Environmental Planning and Management》2015,58(11):2037-2055
This study deals with an assessment of the visual quality of landscapes, and specifically with the perception of selected elements in the landscape. The aim of the study was to find out how particular elements are perceived in various landscape types, whether this perception is affected by the landscape type in which the elements are placed, and to what extent the respondents’ characteristics affect the assessment. The study was carried out with a sample of respondents of various ages, educational levels and types of employment. The respondents came from Slovakia and the Czech Republic. The preferences of the respondents were determined using an online questionnaire, in which they rated landscape photographs on a 21 point rating scale with a range from ?10 to +10 points. Using generalised linear mixed effect models, it was found that the perception of an element is most affected by the landscape type, since the same element was assessed differently according to the landscape in which it was situated. The results confirmed that selected elements which do not disturb the harmony of the landscape are generally positively perceived, and the selected elements of a technical character are generally negatively perceived. Among the characteristics of the respondents, only gender and the respondent's current place of residence have an effect on their visual preferences. 相似文献