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Spatial organization of a shredder guild of caddisflies (Trichoptera) in a riffle - Searching for the effect of competition |
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| Authors: | Dénes Schmera Tibor Ero?s |
| Institution: | a Plant Protection Institute, Hungarian Academy of Sciences, P.O. Box 102, H-1525 Budapest, Hungary b Balaton Limnological Research Institute, Hungarian Academy of Sciences, Tihany, Hungary c Department of Geography, Loughborough University, Loughborough, UK |
| Abstract: | The shredder guild plays an outstanding role in the functioning of headwater stream ecosystems by processing allochthonous leaf litter. Traditionally, the abiotic habitat template is regarded as the major determinant of its organization, and only a limited number of studies support the importance of biotic interactions. The aim of the present study was to examine whether competition plays a significant role in organizing the shredder guild of caddisflies in a riffle. Null-model based co-occurrence, co-existence and guild variation analyses were used in the study of guild organization. In addition, the traditional variance to mean ratio was applied for measuring the intraspecific aggregation of guild members. The non-significant metric values of co-occurrence and co-existence analyses predicted that competition was of limited importance in structuring the spatial organization of the shredder guild. The observed aggregated spatial distribution of species, suggests that besides stochastic events, deterministic forces should also contribute to the organization of the shredder guild of caddisflies. |
| Keywords: | Competition Co-existence Co-occurrence Intraspecific aggregation Association Null model |
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