2004
The effects of management and environmental variation on population stage structure in three river-corridor violets
ECKSTEIN, R. Lutz, Jiří DANIHELKA, Norbert HÖLZEL a Anette OTTEZákladní údaje
Originální název
The effects of management and environmental variation on population stage structure in three river-corridor violets
Název česky
Vliv managementu a faktorů prostředí na populační strukturu tří druhů violek říčních úvalů
Autoři
ECKSTEIN, R. Lutz (276 Německo), Jiří DANIHELKA (203 Česká republika, garant), Norbert HÖLZEL (276 Německo) a Anette OTTE (276 Německo)
Vydání
Acta oecologica, Amsterdam, Elsevier, 2004, 1146-609X
Další údaje
Jazyk
angličtina
Typ výsledku
Článek v odborném periodiku
Obor
10600 1.6 Biological sciences
Stát vydavatele
Nizozemské království
Utajení
není předmětem státního či obchodního tajemství
Impakt faktor
Impact factor: 1.034
Kód RIV
RIV/00216224:14310/04:00021193
Organizační jednotka
Přírodovědecká fakulta
UT WoS
000220436100011
Klíčová slova anglicky
Bryophyte cover; Conservation; Fragmentation; Litter; Management; Population Viability; Viola
Štítky
Příznaky
Mezinárodní význam, Recenzováno
Změněno: 18. 12. 2006 13:29, Ing. Jiří Danihelka, Ph.D.
V originále
Population stage structure of plants, i.e. the density and frequency of individuals in different stages of the life-cycle, is a crucial aspect of population viability that depends on a variety of factors. In this paper, we evaluated the effects of (i) management and year, (ii) location (population) and time (year) and (iii) of local habitat quality and population factors on population stage structure of three morphologically similar, closely related violets from floodplains, Viola elatior, V. pumila and V. stagnina. We hypothesized that owing to similar life-cycles there should be no significant differences in population stage structure among species. We analysed population stage structure in managed vs. abandoned population to test whether a proposed effect of management acts through the creation of regeneration niches. We further tried to identify which habitat factors are responsible for possible management effects. We established permanent plots (0.25 m2) in 27 populations of the species in two different regions (Rhine floodplains, Germany; Dyje River floodplains, Czech Republic) and recorded frequency and density of seedlings, small and large vegetative plants and small and large flowering plants during 2 years. There were significant differences among species, indicating that the species have different life histories. Furthermore, there was a significant effect of management on population stage structure in two of the species. Management significantly increased the proportion of seedlings, over and above possible differences between regions. In our data set, the effects of spatial variation among populations were generally larger than the effects of temporal variation. The only factor that affected the density of life-cycle stages was the cover of bryophytes, while the cover of higher plants, litter or soil (local habitat quality), or isolation and population size (population factors) had no effects.
Česky
Struktura populací rostlin, tj. hustota a frekvence jedinců různých stadií životního cyklu, je klíčová pro životaschopnost populací, která zavisí na mnohých faktorech. Hodnotili jsme (1) vliv managementu a roku, (2) vliv lolity (populace) a času (rok) a (3) vliv kvality habitatu a populačních faktorů na zastoupení jednotlivých stadií tří podobných blízce příbuzných violek Viola elatior, V. pumila and V. stagnina.
Návaznosti
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