Fish distributions and nutrient cycling in streams: can fish create biogeochemical hotspots?

Ecology
Peter B McIntyreSteven A Thomas

Abstract

Rates of biogeochemical processes often vary widely in space and time, and characterizing this variation is critical for understanding ecosystem functioning. In streams, spatial hotspots of nutrient transformations are generally attributed to physical and microbial processes. Here we examine the potential for heterogeneous distributions of fish to generate hotspots of nutrient recycling. We measured nitrogen (N) and phosphorus (P) excretion rates of 47 species of fish in an N-limited Neotropical stream, and we combined these data with population densities in each of 49 stream channel units to estimate unit- and reach-scale nutrient recycling. Species varied widely in rates of N and P excretion as well as excreted N:P ratios (6-176 molar). At the reach scale, fish excretion could meet >75% of ecosystem demand for dissolved inorganic N and turn over the ambient NH4 pool in <0.3 km. Areal N excretion estimates varied 47-fold among channel units, suggesting that fish distributions could influence local N availability. P excretion rates varied 14-fold among units but were low relative to ambient concentrations. Spatial variation in aggregate nutrient excretion by fish reflected the effects of habitat characteristics (depth, water ve...Continue Reading

References

Mar 16, 2007·Proceedings of the National Academy of Sciences of the United States of America·Peter B McIntyreMichael J Vanni
Jun 3, 1983·Science·J L MeyerG S Helfman

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Citations

Aug 24, 2013·Proceedings. Biological Sciences·Krista A Capps, Alexander S Flecker
Oct 15, 2011·PloS One·Stéphanie BoulêtreauFrédéric Santoul
Dec 6, 2011·PloS One·Blake MatthewsJonathan B Shurin
Jan 24, 2013·PloS One·Krista A Capps, Alexander S Flecker
Mar 23, 2013·PloS One·Robin G MunshawJacques C Finlay
May 14, 2011·Ecological Applications : a Publication of the Ecological Society of America·Craig A LaymanLauren A Yeager
Dec 24, 2013·Ecology·Michael J VanniPeter B McIntyre
Jan 16, 2014·Environmental Science & Technology·Matthew A BarnesDavid M Lodge
Oct 24, 2013·Ecological Applications : a Publication of the Ecological Society of America·Tara M HolitzkiKarla J McDermid
May 23, 2013·Ecology·Craig A LaymanElizabeth W Stoner
Dec 28, 2011·The Science of the Total Environment·Timothy D JardineStuart E Bunn
Jan 20, 2012·The Science of the Total Environment·Sae Yun KwonLinda M Campbell
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May 23, 2015·Oecologia·Gergely BorosMichael J Vanni
Dec 17, 2014·Trends in Ecology & Evolution·Marina Alberti
Aug 16, 2016·The Science of the Total Environment·Pablo Rodríguez-LozanoNarcís Prat
Oct 19, 2016·Oecologia·Jeffrey P StephensThomas R Raffel
Dec 23, 2016·Biological Reviews of the Cambridge Philosophical Society·Carla L AtkinsonMichael J Vanni
Jan 6, 2017·Ecological Applications : a Publication of the Ecological Society of America·Alexander V AlexiadesClifford E Kraft
Jun 21, 2017·Proceedings of the National Academy of Sciences of the United States of America·Amanda L SubaluskyDavid M Post
Sep 25, 2018·Biological Reviews of the Cambridge Philosophical Society·Amanda L Subalusky, David M Post

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