Habitat fragmentation increases seed dispersal limitation across the landscape and may also affect subsequent demographic stages such as seedling establishment. Thus, the development of adequate plans for forest restoration requires an understanding of mechanisms by which fragmentation hampers seed delivery to deforested areas and knowledge of how fragmentation affects the relationship between ...

Polyploidy and gametophytic apomixis are two important and associated processes in plants. Many hawthorn species are polyploids and can reproduce both sexually and apomictically. However, the population genetic structure of these species is poorly understood. Crataegus douglasii is represented exclusively by self-compatible tetraploid pseudogamous apomicts across North America, whereas Crataegu...

Natalie Joseph-Williams lecturer , Amy Lloyd research fellow , Adrian Edwards professor , Lynne Stobbart senior research associate , David Tomson executive partner and freelance consultant in patient centred care 4 , Sheila Macphail consultant in obstetrics and fetal medicine and assistant medical director , Carole Dodd director , Kate Brain reader , Glyn Elwyn professor , Richard Thomson profe...

Adres do korespondencji: dr n. med. Beata Kieć-Wilk, Katedra Biochemii Klinicznej, Uniwersytet Jagielloński Collegium Medicum, ul. Kopernika 15a, 31-501 Kraków, tel.: +48 12 421 87 92, e-mail: [email protected] Praca wpłynęła: 30.06.2009. Zaakceptowana do druku: 01.07.2009. Praca powstała w ramach realizacji projektu Ministerstwa Nauki i Informatyzacji (MNiI) nr N401 008 31/0143 (0143/P01/2...

Morphological, numerical and chemical taxonomy of the genus Crataegus was studied in the East and northeast of Iran. More than 80 fresh specimens as well as 50 herbarium specimens from different localities were examind. Using vegetative and reproductive morphological characters an identification key is provided for all taxa. For numerical taxonomy 85 morphological characters were measured and t...

Crataegus oxycantha popularly known as Hawthorn is widely distributed in northern hemisphere especially in Asia, Europe and parts of America. Howthorn consist of more than 200 species and several parts of the plant is traditionally used in the china and Europe. In India it is widely distributed in the temperate Himalayan regions and the different parts of plant is used for multiple health effec...

Ecological speciation with gene flow may be an important mode of diversification for phytophagous insects. The recent shift of Rhagoletis pomonella from its native host downy hawthorn (Crataegus mollis) to introduced apple (Malus domestica) in the northeastern United States is a classic example of sympatric host race formation. Here, we test whether R. pomonella has similarly formed host races ...