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Seed dispersal via a new watercourse in a reconnected floodplain: differences in species groups and seasonality

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Schwab, André ; Stammel, Barbara ; Kiehl, Katrin:
Seed dispersal via a new watercourse in a reconnected floodplain: differences in species groups and seasonality.
In: Restoration ecology : the journal of the Society for Ecological Restoration. Bd. 26 (2018) Heft S2. - S103-S113.
ISSN 1526-100X ; 1061-2971

Volltext

Link zum Volltext (externe URL): https://doi.org/10.1111/rec.12677

Kurzfassung/Abstract

Reconnection of floodplains to rivers to enhance fluvial dynamics is a favored method of floodplain restoration in Europe. It
is believed that the restoration of hydrological conditions of the floodplain facilitates natural dispersal of target species, and
hence the reestablishment, of typical plant communities. The aim of our study was to investigate whether floodplain target
species could reach restoration sites via hydrochorous dispersal. We analyzed seed inflow from the river and seed dispersal
in different sectors of a new watercourse in the Danube floodplain. Seeds were captured using 27 seed traps during three
sampling periods of 3 weeks each from summer 2011 to spring 2012. After germination seedlings were identified, we detected
a total of almost 39,000 seeds of 176 species, including 80 target species of riparian habitats. We found significant differences
between seasons (most seeds in autumn/winter) and between stream sectors. Fewer seeds came in from the Danube (2,800
seeds) than were transported within the floodplain. Several new floodplain target species were detected, which had not been
found in the aboveground vegetation or soil seed bank before the start of the restoration. Seeds of nonnative species did not
disperse further than approximately 1 km. Our results indicated that hydrochorous seed dispersal from upstream habitats
along the new watercourse was important for the establishment of target species and hence for the success of floodplain
restoration. Technical water diversion weirs must be traversable for seeds, and small donor sectors upstream might enhance
the reestablishment of target vegetation along new sectors downstream.

Weitere Angaben

Publikationsform:Artikel
Schlagwörter:Danube, ecological restoration, hydrochory, nonnative species, seed traps, target species
Institutionen der Universität:Mathematisch-Geographische Fakultät > Geographie > Professur für Angewandte Physische Geographie und KU-Forschungsstelle Aueninstitut Neuburg
DOI / URN / ID:10.1111/rec.12677
Open Access: Freie Zugänglichkeit des Volltexts?:Nein
Peer-Review-Journal:Ja
Titel an der KU entstanden:Ja
Eingestellt am:06. Jun 2018 10:26
Letzte Änderung:07. Feb 2019 15:04
URL zu dieser Anzeige:http://edoc.ku-eichstaett.de/21489/