Ramet demography and ecological attributes of the perennial river corridor plant Cnidium dubium (Schkuhr) Thell. (Apiaceae)

Germination ecology of three endangered river corridor plants in relation to their preferred occurrence

“…Seed size of fifty seeds was estimated using a binocular and a calliper. a Geissler and Gzik (2008a). b Rothmaler (2005).…”

“…It has large seeds compared with G. officinalis and J. atratus, providing simply the opportunity for gap establishment from shallow buried seeds (Harper and Obeid, 1967;Pearson et al, 2002). Most of the seeds should have been incorporated into the soil by bioturbation when disturbance by early-summer mowing occurs, an important factor at sites of C. dubium (Burkart, 2001;Geissler and Gzik, 2008a;Härdtle et al, 2006). However, the seasonal dormancy pattern detected and the germination in the field experiment fail to support that germination of C. dubium is beneficial at that time of the season.…”

Eco-coenotic conditions and structure of Trollius europaeus L. populations in an extrazonal habitat complex (Transylvanian Carpathian foothills)

“…An expeditious approach to demographic studies is a single census per population in a range of plant community types, site conditions or under different management regimes, with the aim to relate them to population stage structure (Endels et al, 2004a,b). The usefulness of this simplified method has proven to be successful in a number of studies on perennial plant species, including rare and endangered species (Aguraiuja et al, 2004;Bissels et al, 2004;Bühler and Schmid, 2001;Colling et al, 2002;Eckstein et al, 2004;Endels et al, 2004a;Geissler and Gzik, 2008;Hegland et al, 2001;Kolehmainen and Mutikainen, 2006;Moora et al, 2007;Oostermeijer et al, 1994). On the basis of population stage structure, one may identify three main types of population: dynamic (expansive), stable and regressive (Rabotnov, 1985).…”

Life-history variation in agricultural and wild populations of Erucastrum nasturtiifolium (Brassicaceae)

“…Some work studies the relationship between early-flowering or annual cycles and more disturbed habitats or increased resource availability, although Hermanutz and Weaver (1996) did not find such relationship. Furthermore, flowering time may also be influenced by biotic factors, including plant size (Geissler and Gzik, 2008;Gross, 1981;Kelly, 1992;Lacey, 1986;Pino et al, 2002;Reinartz, 1984;Zopfi, 1998), vernalization (Baskin and Baskin, 1979;Koornneef, 1997) or genetically controlled factors, such as ploidy level (Bretagnole and Thompson, 1996;Silvertown and Lovett-Doust, 1993).…”