The current study aims to estimate the most frequent number of nucleoli in taxonomically interesting Fritillaria species. Silver nitrate staining is applied using a modified protocol 14 taxa and one hybrid from 17 populations Greece. This first report for all studied here. In general, ranges 0-8, with pontica F. theophrasti characterised by greatest observed nucleoli. results reinforce classifi...

Species living in highly fragmented landscapes often occur as metapopulations with frequent population turnover. Turnover rate is known to depend on ecological factors, such as population size and connectivity, but it may also be influenced by the phenotypic and genotypic composition of populations. The Glanville fritillary butterfly (Melitaea cinxia) in Finland uses two host-plant species that...

The term extinction threshold refers to a critical value of some attribute, such as the amount of habitat in the landscape, below which a population, a metapopulation, or a species does not persist. In this paper we discuss the existence and behavior of extinction thresholds in the context of metapopulation models. We review and extend recent developments in the theory and application of patch ...

Many hypotheses have been proposed to explain multiple mating in females. One of them is bet hedging, that is avoiding having no or very few offspring in any given generation, rather than maximizing the expected number of offspring. However, within-generation bet hedging is generally believed to be an unimportant evolutionary force, except in very small populations. In this study, we derive pre...

Antennas Group-TERALAB, Universidad Pública de Navarra, Campus Arrosadía, 31006 Pamplona, Spain Optical and Semiconductor Devices Group, Department of Electrical and Electronic Engineering, Imperial College London, London SW7 2BT, UK Centre for Plasmonics and Metamaterials, Imperial College London, London SW7 2AZ, UK Centre for Terahertz Science and Engineering, Imperial College London, London ...

Anaesthetics, Pain Medicine and Intensive Care Section, Department of Surgery and Cancer, Imperial College London, United Kingdom. Department of Life Sciences, Imperial College London, United Kingdom. # Correspondence should be addressed to: Dr Robert Dickinson, Department of Surgery & Cancer, Imperial College London, Sir Ernst Chain Building, South Kensington, London SW7 2AZ, UK. Tel: + 44 (0)...

So far we do not have much serious scholarship on the study of polygamy in ancient China, except for collections of literary compositions. Keith McMahon's newest book, Women Shall Not Rule: Imperial Wives and Concubines in China from Han to Liao, fills in this blank in the field of Chinese studies. In this book, written with conscientiousness and compassion, Keith McMahon illustrates early Chin...

The Kean–Barlow model predicts how the equilibrium distribution and abundance of a population may be affected by local rates of increase, dispersal, colonisation, and extinction. Here, the model is parameterised for three insects: the Glanville fritillary Melitaea cinxia in Åland, Finland, the ribbonwood aphid Paradoxaphis plagianthi in Christchurch, New Zealand, and the coxella weevil Hadramph...

Climate change is known to shift species' geographical ranges, phenologies and abundances, but less is known about other population dynamic consequences. Here, we analyse spatio-temporal dynamics of the Glanville fritillary butterfly (Melitaea cinxia) in a network of 4000 dry meadows during 21 years. The results demonstrate two strong, related patterns: the amplitude of year-to-year fluctuation...