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Context dependency in periphyton and invertebrates: interactions between velocity and nutrients in the Australian wet-dry tropics.

Garcia, Erica A., Townsend, Simon A. and Douglas, Michael M. (2010). Context dependency in periphyton and invertebrates: interactions between velocity and nutrients in the Australian wet-dry tropics.. In: North America Benthological Society Meeting, Santa Fe, New Mexico, United States of America, 6-11 June 2010.

Document type: Conference Paper
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IRMA ID 81704288xPUB411
Author Garcia, Erica A.
Townsend, Simon A.
Douglas, Michael M.
Title Context dependency in periphyton and invertebrates: interactions between velocity and nutrients in the Australian wet-dry tropics.
Conference Name North America Benthological Society Meeting
Conference Location Santa Fe, New Mexico, United States of America
Conference Dates 6-11 June 2010
Conference Publication Title Aquatic sciences: global changes from the center to the edge Abstract Book 2010 summer meetings
Publication Year 2010
Start Page 83
End Page 83
HERDC Category E3 - Conference Publication - Extract of paper (internal)
Abstract The interactive effect of river velocity and nutrient addition on paver periphyton and benthic invertebrates was examined in a 2-factorial experiment conducted in a 7th order river in the Australian wet-dry tropics during base flow conditions. The velocity factor was represented by 5 categories (0, 0.27, 0.48, 0.78 and 0.97 m/s) and nutrient addition by control and treatment. Nutrients were added by slow release capsules contained in mesh bags. Overall periphyton biomass was lowest at the highest velocity site and responded positively to nutrient addition only at the 0 m/s and 0.78 m/s sites. AFDM varied significantly between the different velocity sites but did not vary relative to nutrient treatments. Invertebrate communities in the high velocity sites differ greatly from all other sites regardless of nutrient treatment but at 0 m/s sites the community was more diverse with nutrient addition. These results highlight the importance of considering context dependency when examining periphyton biomass and invertebrate community structure.
 
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Created: Fri, 17 Jan 2014, 00:11:01 CST