Riparian vegetation removal alters consumer–resource stoichiometry in an Australian lowland stream
Darren P. Giling A C , Paul Reich A B and Ross M. Thompson A
+ Author Affiliations
- Author Affiliations
A Australian Centre for Biodiversity and School of Biological Sciences, Monash University, Clayton, Vic. 3800, Australia.
B Arthur Rylah Institute for Environmental Research, Department of Sustainability and Environment, Heidelberg, Vic. 3084, Australia.
C Corresponding author. Email: darren.giling@monash.edu
Marine and Freshwater Research 63(1) 1-8 https://doi.org/10.1071/MF11092
Submitted: 20 April 2011 Accepted: 28 July 2011 Published: 2 November 2011
Abstract
Anthropogenic impacts on stream ecosystems generate changes in nutrient and carbon availability which act as stoichiometric challenges to consumers. We tested the hypothesis that removal of Eucalyptus riparian vegetation alters in-stream resource stoichiometry with flow-on effects for a benthic consumer (the freshwater crayfish, Cherax destructor). Sites with high and low riparian canopy cover were selected on a lowland stream in south-eastern Australia. A reduction in riparian vegetation canopy cover was associated with decreased terrestrial detritus (low nutritional quality; high carbon to nitrogen (C : N) ratio) and increased cover of macrophytes and filamentous algae (high quality; low C : N ratio). This resource-quality shift was associated with a small but significant decrease in C. destructor C : N ratio (molar ratio of muscle tissue). This suggests that the animals are deviating from homeostasis and may be in better condition in the stream pools dominated by in-stream productivity. A significant negative relationship between C. destructor length and C : N ratio was observed, suggesting that resource-quality impacts may differ with age. The present study has shown that riparian loss alters stoichiometric interactions in stream benthic ecosystems, with potential consequences for stream processes such as nutrient cycling. Ecological stoichiometric theory should therefore be further utilised to make predictions of ecological impacts in freshwater systems.
Additional keywords: carbon, C : N ratio, crayfish, crustacean, detritus, elemental homeostasis, nitrogen.
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