ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

Monograph available for loan

Populationsbiologie der Pflanzen : Grundlagen, Probleme, Perspektiven (1992)

Urbanska, Krystyna M.

Stuttgart, jena : Gustav Fischer Verlag

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Call number: PIK N 614-92-0561

Type of Medium: Monograph available for loan

Pages: 374 S.

ISBN: 3437204815

Series Statement: UTB für Wissenschaft: Uni-Taschenbücher 1631

Location: A 18 - must be ordered

Branch Library: PIK Library

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2

Electronic Resource

Seed Rain in Natural Grassland and Adjacent Ski Run in the Swiss Alps: A Preliminary Report (1998)

Urbanska, Krystyna M. ; Erdt, Silvia ; Fattorini, Marzio

Cambridge, MA, USA : Blackwell Science Inc

Restoration ecology 6 (1998), S. 0

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ISSN: 1526-100X

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: Seed rain was studied during one growing season in an intact high-alpine grassland and in a downhill ski run that had been machine-graded about 26 years earlier. The study plots were located at about 2500 meters above sea level. The number of trapped seeds per square meter in the grassland was significantly larger than in the ski run (930 versus 96, respectively). Alpha diversity in seed rain was about two times higher in the grassland than in the ski run. Seed rain was primarily influenced by site conditions but also varied in space and time, and both the actual number of diaspores and the species composition changed throughout the growing season. Most of the species found in the seed rain occurred in the standing vegetation, but some clearly arrived from outside. Seed rain in both sites was dominated by a few species, and no clear relationships were found between the species abundance in standing vegetation and in the seed rain. The results of this preliminary study contribute to a better understanding of plant behavior in high-alpine sites and will be helpful in planning and implementing restoration work above the timberline.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1526-100X.1998.00626.x

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3

Electronic Resource

Seed Rain in High-Altitude Restoration Plots in Switzerland (2000)

Urbanska, Krystyna M. ; Fattorini, Marzio

Boston, MA, USA : Blackwell Science Inc

Restoration ecology 8 (2000), S. 0

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ISSN: 1526-100X

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: Seed rain was studied in restoration plots installed in 1985 and 1987, respectively, on an alpine downhill ski run at circa 2,500 m above sea level. The study was initiated in late autumn 1996 and completed in autumn 1998; it included temporal and spatial variation in density per m2, as well as alpha diversity (species richness), and species composition of the seed rain versus that of the resident vegetation. This is the first report on post-restoration monitoring of seed rain above the timberline. Seed rain density and alpha diversity varied seasonally, with the first peak occurring immediately after spring snowmelt and the second in early autumn. The density of seed rain varied between plots and years (1,528–1,778 seeds per m2 in one plot [RPF] versus 1,096–3,557 seeds per m2 in another plot [RPG]). Total species number per plot was nearly twice as high in RPF as in RPG in both study years. Seed rain totaled 18 species; all but one represented either transplants introduced in restoration or colonizers established in the plots soon after restoration. Distribution of species in seed rain was largely asymmetric and only a few species provided substantial contributions. Composition of species and their respective contribution to seed rain differed between plots and was clearly influenced by performance of some species used in restoration as transplants; together they provided as much as 51% of the total seed rain. The results of the study demonstrate that restoration enhanced increase of species richness as well as seed rain in situ.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1046/j.1526-100x.2000.80010.x

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4

Electronic Resource

Pollen, Mating and Paternity in Agamospermous Angiosperms (1994)

URBANSKA, KRYSTYNA M.

Oxford, UK : Blackwell Publishing Ltd

Plant species biology 9 (1994), S. 0

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ISSN: 1442-1984

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: Abstract This review article deals with the male function in agamospermous plants, which is still not fully recognized. Of particular interest are mating and paternity problems. Pollen of agamospermous donors may influence female fitness in early mating phases by contributing the recognition substances or inducing spontaneous seed development. Various interactions between the sperm cell(s) and the female gametophyte at later phases may include (1) occasional double fertilization, (2) occasional syngamy, (3) pseudogamy, and (4) hemigamy. In the first two processes the offspring are sired normally. In pseudogamy, the offspring is maternal, the male contribution being restricted to endosperm paternity. In hemigamy, male function may include induction of the egg cell development only (maternal offspring), or the induction of the egg cell development as well as independent participation of the sperm cell in the offspring development leading to the formation of chimeras. It is concluded that the sperm may be a limiting resource in at least some agamospermous plants. Possible directions of future research are briefly outlined.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1442-1984.1994.tb00083.x

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5

Electronic Resource

Biodiversity assessment in ecological restoration above the timberline (1995)

Urbanska, Krystyna M.

Springer

Biodiversity and conservation 4 (1995), S. 679-695

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ISSN: 1572-9710

Keywords: biodiversity assessment ; ecological restoration ; age-states ; delta diversity

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract Ecological restoration trials in high-alpine sites require sampling of indigenous plant populations. This problem is discussed briefly in relation to initial genetic diversity in the restoration material. The further part of the paper deals with restoration trials in the Swiss Alps and their assessment. The plots, set in machine-graded downhill ski runs, were revegetated with transplants of alpine species used in various combinations. Safe-site conditions were simulated with biodegradable wood-fibre mats. Surveys carried out in plots aged four to seven years focused on plant species inventory and age-state structure of mixed stands. The alpha diversity assessment included speices number and the associated aspects. The consistent increase in species number, the number of plant families represented, and range of life-forms was apparently independent of the restoration timing. The age-state structure of the mixed stands was characterized by a considerable increase in the range of age-state classes and, in particular, a regular appearance of younger variants. These changes clearly indicate development of self-sustaining plant communities influenced by reproduction of the transplants and extensive immigration. It is proposed that age-state structure be called delta diversity and included in a routine assessment of post-restoration status of both single plant populations and mixed stands.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00158862

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6

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Restoration ecology research above the timberline: colonization of safety islands on a machine-graded alpine ski run (1997)

URBANSKA, KRYSTYNA M.

Springer

Biodiversity and conservation 6 (1997), S. 1655-1670

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ISSN: 1572-9710

Keywords: colonization ; safety islands ; species richness ; immigrant populations ; minimum travelling distance ; diaspore sources

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract Colonization was studied in safety islands installed on a machine-graded downhill ski run (ca 2500m asl) and respectively aged 7, 8, and 9 years. For comparison, the neighbouring non-restored plots were investigated. The study included assessment of species richness (alpha diversity), size and spatial structure of the immigrant populations, and the nearest possible diaspore sources. The number of colonizing species recorded in the safety islands totalled 44 whereas only 25 species were found in the non-restored ski run plots close by. The mean species number per whole plot, per 1m2 and per 0.1m2 was significantly higher in the safety islands than in the non-restored ski run plots. Population founders and small populations represented more than half of all immigrant species in the safety islands, but medium-sized and large populations were also present. The overall distribution of plants was patchy but the number of individuals per 1m2 was significantly higher in the safety islands than in the ski run. Travelling distances separating the safety islands from the nearest possible diaspore source were often exceedingly short and ranged between 0.10m and 1m in 47.7% of all populations studied. It seems that the diaspore sources were mostly secondary i.e. plants scattered over the non-restored ski run, and those previously used in restoration trials, served as diaspore donors. The results of the study clearly demonstrate that successful colonization of machine-graded alpine ski runs in the study area is ultimately limited by safe-site availability and not by deficiencies in seed rain or remote diaspore sources. The colonization process in the safety islands is apparently well-advanced.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1018382923596

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7

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Hybridization and evolution inCardamine (Brassicaceae) at Urnerboden, Central Switzerland: Biosystematic and molecular evidence (1997)

Urbanska, Krystyna M. ; Hurka, Herbert ; Landolt, Elias ; [et al.]

Springer

Plant systematics and evolution 204 (1997), S. 233-256

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ISSN: 1615-6110

Keywords: Brassicaceae ; Cardamine amara ; C. ×insueta ; C. rivularis ; C. schulzii ; Hybridization ; evolution ; amphiploidy ; introgression ; cpDNA ; isozymes ; RAPD

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract Hybridization between two diploid (2n = 2x = 16) species ofBrassicaceae, Cardamine rivularis andC. amara, at Urnerboden, Central Switzerland, resulted in the rather unusual triploid hybridC. insueta (2n = 3x = 24), and later on in the amphiploidC. schulzii (2n = 6x = 48). The hybrid and the neopolyploid species colonized successfully some man-made biotopes. Plants ofC. insueta are mostly functional females with non-dehiscent anthers, but true hermaphrodite individuals with partly sterile pollen grains also occur within the population. Analyses of cpDNA and nuclear DNA permitted to establish the parentage of the hybrid: the maternal parent which contributed unreduced egg cells proved to beC. rivularis whereas the normally reduced pollen originated fromC. amara. The pronounced genetic variability inC. insueta revealed by isozyme and RAPD analyses, at variance with the polarized segregation, heterogamy and strong vegetative reproduction of the hybrid, is possibly influenced by recurrent formation ofC. insueta which party results from backcrosses betweenC. insueta andC. rivularis but may also proceed by other pathways. The amphiploidCardamine schulzii has normally developed anthers but its pollen is sometimes highly sterile. The surprisingly uniform genetic make-up of the new amphiploid species might be related to its possible monotopic origin and/or young phylogenetic age but should be further assessed. Site management seems to be very important to a further development of hybridogenous populations and their parent species. In conclusion, the evolution at Urnerboden is discussed in the context of the traditional concept of multiple plant origins.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00989208

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