IngentaConnect Modelling epiphytic bryophyte vegetation in an urban landscape

Authors: Richter, Sandra¹; Schuütze, Peter²; Bruelheide, Helge¹

Source: Journal of Bryology, Volume 31, Number 3, September 2009 , pp. 159-168(10)

Abstract:

Air pollution in the urban environment of Halle, Germany, has significantly decreased over the last decade. We investigated the distribution and recolonization of the epiphytic bryoflora. We tested the hypothesis that after a period of nearly complete absence of epiphytic mosses and liverworts, recolonization would occur first in the most favourable habitats and proceed from there. The aims of the study were to analyse these habitat conditions, to generate habitat models for the most abundant species and to identity favourability of habitats. At the community level, mixed linear models revealed the factors aspect of plots, inclination of trees and landscape features to be of particular relevance to bryophyte diversity and coverage. At the species level, generalized linear mixed models with logit link functions identified aspect, tree inclination and landscape type to be the key habitat factors for most taxa, while identity of the host tree species and stand structure were of minor importance. In general, epiphytic bryophyte vegetation did not attain high coverage and many species occurred only rarely. Thus, significant habitat models were obtained only for frequent species (e.g. Orthotrichum diaphanum) and only with low coefficients of determination. Nevertheless, the results clearly show that species-sorting is an effective mechanism of community assembly even in this early stage of recolonization.

Keywords: BRYOPHYTE DIVERSITY; EPIPHYTES; HABITAT MODELS; URBAN FLORA; GERMANY

Document Type: Research article

DOI: 10.1179/174328209X431277

Affiliations: 1: Martin Luther University Halle Wittenberg, Institute of Biology/Geobotany and Botanical Garden, Am Kirchtor 1, 06108 Halle (Saale), Germany 2: Goethestraße 25, 06114 Halle (Saale), Germany

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