Dynamics of Typha domingensis spread in Eleocharis dominated oligotrophic wetlands following nutrient enrichment

0379827 - BC 2013 RIV NL eng J - Článek v odborném periodiku
Macek, Petr - Rejmánková, E. - Lepš, Jan
Dynamics of Typha domingensis spread in Eleocharis dominated oligotrophic wetlands following nutrient enrichment.
Evolutionary Ecology. Roč. 24, č. 6 (2010), s. 1505-1519. ISSN 0269-7653. E-ISSN 1573-8477
Grant CEP: GA ČR GD206/08/H044; GA MŠMT ME 916
Výzkumný záměr: CEZ:AV0Z50070508; CEZ:AV0Z60050516
Klíčová slova: insect damage * light limitation * nitrogen and phosphorus enrichment
Kód oboru RIV: EH - Ekologie - společenstva
Impakt faktor: 2.398, rok: 2010
http://www.springerlink.com/content/d418245008136g3l/fulltext.pdf

Recent agricultural intensification in tropical countries has led to increased nutrient input and eutrophication of wetland ecosystems. Higher nutrient levels often lead to changes of vegetation structure and, eventually, shift in species dominance and loss of ecosystem services. We studied the dynamics of species shift in a manipulative nutrient enrichment experiment (+N, +P, +N&P) in oligotrophic wetlands of northern Belize distributed along a salinity gradient. We monitored spread and biomass accumulation of an introduced single individual of Typha domingensis within a 4 years period. The focus was on speed of the spreading and the relative importance of neighbouring ramets in this process. Large differences were found between control and N addition plots versus P and N&P addition plots. The ramets planted in control and N plots died or barely survived, while ramets in P and N&P plots grew vigorously and almost completely outcompeted original vegetation represented by Eleocharis spp. Final numbers of ramets were 2 and 576 per 100 m 2 for control and N versus P and N&P plots. The filling dynamics of P-enriched plots of differing salinity changed in time. The spreading was delayed in low salinity plots compared to high and medium salinity plots, although it finally reached comparable rates and values. We attribute this delay to originally denser vegetation and less suitable soil conditions in low salinity plots than to a direct salinity effect. Eventually, the number of ramets stabilized and often even decreased, probably due to self-thinning. Spatiotemporal model extrapolating observed vegetative spread suggested that in P-enriched conditions, a clone originating from a single individual is able to cover 1 ha plot completely within 9 years. We conclude that P-enrichment strongly increases the possibility of fast takeover of Belizean wetlands by Typha domingensis.
Trvalý link: http://hdl.handle.net/11104/0210697