Document Detail

Colonization of ephemeral detrital patches by vagile macroinvertebrates in a brackish lake: a body size-related process?
MedLine Citation:
PMID:  17120057     Owner:  NLM     Status:  MEDLINE    
The mechanisms regulating the build-up of invertebrate assemblages on ephemeral detritus patches are still poorly understood. Here, the daily colonization of decaying reed leaves by vagile macroinvertebrates was monitored in an brackish lake in Italy. The highly variable abundance patterns of dominant taxa were analysed by spectral and geostatistical techniques to test for nonrandomness and to further determine whether they were related to body size. Comparisons between two contrasting sites allowed an assessment of the generality of our observations. At both sites, the macroinvertebrate assemblage was dominated by three detritivorous taxa, i.e. the isopod Lekanesphaera monodi, the amphipod Microdeutopus gryllotalpa and the polychaete Neanthes caudata. Overall, their abundance patterns were characterised by short-term fluctuations of a nonrandom, autocorrelated nature. In addition, a significant covariation was observed between the average body mass of each taxon and the complexity of the respective abundance pattern, expressed by the fractal dimension D. The covariation was observed at both study sites, notwithstanding the diverging outcomes of bivariate pattern comparisons for similar-sized taxa. Our findings indicate that the size of macroinvertebrates is strongly related to the short-term dynamics of their abundance patterns on reed detritus, suggesting that the interaction between vagile consumers and ephemeral resource patches might be influenced by individual energetics. The implications of size-related constraints for the coexistence of species on decaying detrital patches are discussed.
Giorgio Mancinelli; Letizia Sabetta; Alberto Basset
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-11-22
Journal Detail:
Title:  Oecologia     Volume:  151     ISSN:  0029-8549     ISO Abbreviation:  Oecologia     Publication Date:  2007 Mar 
Date Detail:
Created Date:  2007-02-19     Completed Date:  2007-08-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0150372     Medline TA:  Oecologia     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  292-302     Citation Subset:  IM    
Di.S.Te.B.A-Department of Biological and Environmental Sciences and Technologies, University of Lecce, sp Lecce-Monteroni, 73100, Lecce, Italy.
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MeSH Terms
Analysis of Variance
Body Weight
Fresh Water*
Invertebrates / growth & development*
Plant Leaves
Population Dynamics
Species Specificity
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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