Document Detail

Effects of experimental duration and density of Japanese dace Tribolodon hakonensis on the strength of trophic cascades on benthic algae.
MedLine Citation:
PMID:  17694329     Owner:  NLM     Status:  MEDLINE    
To analyze density-mediated indirect effects through trophic cascades caused by Japanese dace Tribolodon hakonensis on the algal biomass and growth of ayu Plecoglossus altivelis altivelis, (freshwater fish belonging to Salmoniformes), I introduced zero, five, ten, and 20 dace with and without ayu into experimental pools. Ayu fed predominantly on benthic algae, whereas dace fed on both invertebrates and algae. The percentage of algae in the food content of dace was correlated with the number of dace in a pool. In the experiment lasting 8 days, trophic cascades on algae were not clear. In contrast, when the experimental duration was extended to 20 days, the number of gastropods and ephemeropteran nymphs was negatively correlated with the number of dace, consequently increasing the algal biomass and ayu growth through trophic cascades. Compared with pools with five dace, the presence of ten and 20 dace had similar gross effects on the number of algivorous invertebrates and algal biomass and greater gross effects on the ayu growth. The significant increase in ayu growth in pools with ten and 20 dace strongly suggests that small positive effects on algal growth by dace accumulated and extended to ayu during a 20-day experimental period. These results indicate the importance of analyzing interactions between the density and behavior of the top predator and the experimental duration on the intensity of trophic cascades.
Osamu Katano
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-08-11
Journal Detail:
Title:  Oecologia     Volume:  154     ISSN:  0029-8549     ISO Abbreviation:  Oecologia     Publication Date:  2007 Nov 
Date Detail:
Created Date:  2007-10-15     Completed Date:  2007-12-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0150372     Medline TA:  Oecologia     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  195-205     Citation Subset:  IM    
National Research Institute of Fisheries Science, Fisheries Research Agency, Komaki, Ueda, Nagano, 386-0031, Japan.
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MeSH Terms
Algae / physiology*
Feeding Behavior / physiology*
Food Chain*
Population Dynamics
Salmoniformes / physiology*

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