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001-es BibID:BIBFORM064222
Első szerző:Molnár V. Attila (biológus, botanikus)
Cím:Seed of the threatened annual legume, Astragalus contortuplicatus, can survive over 130 years of dry storage / Attila Molnár V., Judit Sonkoly, Ádám Lovas-Kiss, Réka Fekete, Attila Takács, Lajos Somlyay, Péter Török
Dátum:2015
ISSN:0032-7786
Megjegyzések:Long-term seed viability is of crucial importance for short-lived species, since persistent seed banks can buffer the fluctuations in the establishment of plants from year to year. Temporarily flooded habitats are an unpredictable environment for plants, and for some species the only chance they have of surviving is the formation of persistent seed banks. Astragalus contortuplicatus is an annual species of periodically flooded habitats and is considered an endangered species in Hungary. Altogether 1993 seeds of this species were tested in a germination experiment: 1200 were freshly harvested and 793 were collected from herbarium specimens of various ages. Seed viability was tested using the germination method. The freshly harvested seeds were used for selecting the best out of seven frequently used dormancy-breaking methods for this species. The highest percentage of germination was recorded for the combined treatment of scarification and light. Thus, this method was used to test the viability of the seeds collected from herbarium specimens. The oldest seeds that germinated were 131 years old. Until now there are no records of seeds of herbaceous legumes germinating that are more than 100 years old. This record is the 9th oldest of all the literature records of viable seeds originating from biological collections. All the seeds that germinated developed into healthy, fertile plants, the seeds of which also readily germinated. Fitted linear regression showed a significant negative relationship between seed age and percentage germination. Based on this linear regression the calculated theoretical maximum viability is 309 years. Our results suggest that seeds of A. contortuplicatus stored in collections can be successfully used in this species' reintroduction for conservation purpose, to areas in which the plants were collected.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
biological collections
Fabaceae
hard seeds
herbarium
Hungary
physical dormancy
scarification
persistence
seed longevity
seed storage
Megjelenés:Preslia. - 87 : 3 (2015), p. 319-328. -
További szerzők:Sonkoly Judit (1989-) (biológus) Lovas-Kiss Ádám (1991-) (biológus, botanikus) Fekete Réka (1993-) (biológus) Takács Attila (1989-) (biológus, botanikus) Somlyay Lajos Török Péter (1979-) (biológus-ökológus)
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001-es BibID:BIBFORM005001
Első szerző:Török Péter (biológus-ökológus)
Cím:Secondary succession in overgrazed Pannonian sandy grasslands / Péter Török, Gábor Matus, Mária Papp, Béla Tóthmérész
Dátum:2008
ISSN:0032-7786
Megjegyzések:We assessed vegetation changes on acidic sandy soils in permanent plots to follow secondary succession after cessation of intensive goose breeding in E Hungary.We also aimed to estimate the time required for vegetation regeneration and indicate differences in secondary succession patterns at different altitudes in sand dunes. Two sites in the low and two in the high parts of the dunes were chosen and sampled for twelve years. The initial stages are characterized by ruderal communities dominated by nitrophilous annual weeds. Ruderal vegetation was soon replaced by nutrient-poor communities dominated by short-lived pioneer dicotyledonous plants and grasses. In the last few years of the study, coinciding with a rainy period, the low sites were dominated by the perennial grasses, Poa angustifolia, P. pratensis and Cynodon dactylon. In contrast, in the high sites a less dense cover of perennials developed. The influence of initial composition on vegetation development decreased with time and the influence of altitude increased during succession. The altitude of the site had a significant effect on regeneration. Species richness and Shannon diversity of the high sites increased during vegetation development and that of the lowsites decreased. Most annuals persisted in the high sites but became extinct in the low sites. The mean species turnover rate, irrespective of altitude, decreased during the study.
Tárgyszavak:Természettudományok Környezettudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
elevation
denudation
goose breeding
Hungary
inland dunes
rate of succession
species richness
Megjelenés:Preslia. - 80 (2008), p. 73-85. -
További szerzők:Matus Gábor (1968-) (botanikus) Papp Mária (1952-) (biológus, botanikus) Tóthmérész Béla (1960-) (ökológus)
Internet cím:elektronikus változat
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