Facilitation of plant species richness and endangered species by a tussock grass in a moist tall grassland revealed using hierarchical Bayesian analysis
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Using hierarchical Bayesian analysis, we tested the hypothesis that a perennial tussock grass, Ischaemum aristatum var. glaucum, facilitates the species diversity of vegetation and the regeneration of individual native vascular plants in Ukishima Marsh, a moist tall grassland of eastern Japan. We analyzed microscale distribution patterns of sympatric plant species in response to ground height. Both the species richness of the whole plant assemblage and the occurrence of many native vascular plants, including two endangered species, were positively correlated with ground elevation, which was directly mediated by I. aristatum var. glaucum tussocks and/or the occurrence of mosses on tussocks. Susceptibility to late spring inundation of microsites on the tussocks was significantly lower than that on bare ground. These results suggest that the facilitation by I. aristatum var. glaucum contributes to maintaining the high species richness of the marsh. Consideration of the facilitation among native vascular plants is necessary for establishing sound conservation plans of wetland vegetation.
KeywordsInundation Ischaemum aristatum var. glaucum Moss Positive interaction Safe site
This research was supported by the River Fund in charge of the Foundation of River and Watershed Environment Management and a Grant-in-Aid for Young Scientists (B) 19710198 in charge of the Ministry of Education, Culture, Sports, Science, and Technology, Japan, to J. Nishihiro.
- Brooker RW, Maestre FT, Callaway RM, Lortie CL, Cavieres LA, Kunstler G, Liancourt P, Tielborger K, Travis JMJ, Anthelme F, Armas C, Coll L, Corcket E, Delzon S, Forey E, Kikvidze Z, Olofsson J, Pugnaire F, Quiroz CL, Saccone P, Schiffers K, Seifan M, Touzard B, Michalet R (2008) Facilitation in plant communities: the past, the present, and the future. J Ecol 96:18–34. doi: 10.1111/j.1365-2745.2007.01295.x CrossRefGoogle Scholar
- Callaway RM (2007) Positive interactions and interdependence in plant communities. Springer, BerlinGoogle Scholar
- Gelman A, Carlin JB, Stern HS, Rubin DB (2004) Bayesian data analysis, 2nd edn. Chapman & Hall/CRC, Boca RatonGoogle Scholar
- Ibaraki Prefecture (1997) Red data book of wild plants in Ibaraki Prefecture, Japan. Ibaraki Prefecture (in Japanese)Google Scholar
- Nozoe K, Nishihiro J, Hotes S, Washitani I (2010) Importance of Ischaemum aristatum var. glaucum as an indicator of plant species richness in Myoginohana Marsh, Lake Kasumigaura, Japan. Jpn J Conserv Ecol 15:281–290 (in Japanese with English summary)Google Scholar
- R Development Core Team (2009) R: a language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria. ISBN 3-900051-07-0. http://www.R-project.org
- Yabe K (1985) Distribution and formation of tussocks in Mobara-Yatsumi Marsh. Jpn J Ecol 35:183–192Google Scholar