Joint effects of climate warming and exotic litter (Eucalyptus globulus Labill.) on stream detritivore fitness and litter breakdown

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• 作者：Francisco Correa-Araneda (1) (2)
  Luz Boyero (3) (4) (5) (6)
  Ricardo Figueroa (2)
  Carolina S谩nchez (2)
  Roberto Abdala (7)
  Antonio Ruiz-Garc铆a (8)
  Manuel A. S. Gra莽a (10) (9)
  
  1. Aquaculture Research Division ; Environmental Department ; Fisheries Development Institute ; Puerto Montt ; Chile
  2. Water Quality Bioindicators Laboratory ; Faculty of Environmental Science ; University of Concepci贸n ; Concepci贸n ; Chile
  3. Wetland Ecology Department ; Do帽ana Biological Station-CSIC ; Seville ; Spain
  4. School of Marine and Tropical Biology ; James Cook University ; Townsville ; QLD ; Australia
  5. Faculty of Science and Technology ; University of the Basque Country (UPV/EHU) ; Bilbao ; Spain
  6. IKERBASQUE ; Basque Foundation for Science ; Bilbao ; Spain
  7. Ecology Department ; Faculty of Science ; University of M谩laga ; M谩laga ; Spain
  8. Department of Physical ; Chemical and Natural Systems ; University Pablo de Olavide ; Seville ; Spain
  10. IMAR/MARE ; Coimbra ; Portugal
  9. Department of Life Sciences ; University of Coimbra ; Coimbra ; Portugal
  
• 关键词：Climate change ; Exotic species ; Leaf litter breakdown ; Leaf ; shredding detritivores ; Riparian vegetation ; Stream ecosystems ; Temperature
• 刊名：Aquatic Sciences - Research Across Boundaries
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：77
• 期：2
• 页码：197-205
• 全文大小：385 KB
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• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Ecology
  Oceanography
  Life Sciences
  
• 出版者：Birkh盲user Basel
• ISSN：1420-9055

文摘

Joint effects of climate warming and other stressors are potentially complex and difficult to predict. In stream ecosystems, exotic riparian species have the potential to alter leaf-shredding detritivorous invertebrate assemblages and leaf litter breakdown due to differences in the quality of litter inputs. This is the case for Eucalyptus plantations, which are widespread, occurring along riparian corridors of streams around the world. We hypothesised that the presence of Eucalyptus globulus (Labill.) litter (1) impairs detritivore fitness both directly (i.e., through leaf consumption) and indirectly (i.e., through leaf leachates in the water) and (2) impairs litter breakdown, (3) with stronger effects at higher temperatures. We tested these hypotheses in microcosm experiments with two detritivore species from two locations: the stonefly Diamphipnosis samali (Illies, 1960) in Chile and the caddisfly Calamoceras marsupus (Brauer 1865) in Spain. Eucalyptus leaves affected detritivore growth mainly by direct consumption, while the presence of both Eucalyptus leaves and leachates inhibited the breakdown of native litter. When both litter types were available, breakdown of Eucalyptus leaves was enhanced, possibly as a means of compensatory feeding. Increased temperature exacerbated the negative effect of Eucalyptus on native litter breakdown, possibly because it reduced detritivore survival. Our results add to the mounting evidence that joint effects of multiple stressors can be non-additive, and suggest that the sole presence of Eucalyptus leaves and leachates in the water may impact stream communities and ecosystem functions even if native litter is available, with further negative effects to be expected under a warmer climate.