Temporal variation in benthic primary production in streams of the Australian wet–dry tropics

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• 作者：Erica A. Garcia ; Neil E. Pettit ; Danielle M. Warfe ; Peter M. Davies…
• 关键词：Benthic algae ; Gross primary production ; Intermittent streams ; Macroinvertebrates ; Metabolism ; Seasonal hydrology ; Water quality
• 刊名：Hydrobiologia
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：760
• 期：1
• 页码：43-55
• 全文大小：2,750 KB
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• 作者单位：Erica A. Garcia (1)
  Neil E. Pettit (2)
  Danielle M. Warfe (1) (3)
  Peter M. Davies (2)
  Peter M. Kyne (1)
  Peter Novak (1)
  Michael M. Douglas (1)
  
  1. Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, NT, 0909, Australia
  2. Centre of Excellence in Natural Resource Management, The University of Western Australia, Albany, WA, 6330, Australia
  3. School of Biological Sciences, University of Tasmania, Sandy Bay, TAS, 7005, Australia
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Hydrobiology
  Ecology
  
• 出版者：Springer Netherlands
• ISSN：1573-5117

文摘

In the Australian wet–dry tropics, seasonal changes in hydrology can influence abiotic conditions and consequently influence standing stocks of benthic biomass and production. While there is some understanding of these processes at riverscape scales, effects of seasonal hydrology on benthic biomass and production in low-order streams remain largely unquantified. We observed changes in water quality, algal and macroinvertebrate biomass, and stream benthic primary productivity over a 15-month period in three low-order streams with contrasting flow regimes in the wet–dry tropics of northern Australia. Water quantity and quality showed a distinct seasonal signature reflected in seasonal peaks in algal (maximum 1.29 μg cm?) and macroinvertebrate biomass (maximum 0.24 g m?), and productivity (maximum 0.41 g C m? days?). In particular, transitional periods between dry and wet seasons were key times of elevated production and algal biomass. Overall, variation in biomass and benthic primary production was greater between seasons than among streams indicating that extrapolation between seasons may not be appropriate. Keywords Benthic algae Gross primary production Intermittent streams Macroinvertebrates Metabolism Seasonal hydrology Water quality