The relative importance of autochthony along the longitudinal gradient of a small South African river influenced by agricultural activities

Anderson, 2005, δ15N in riverine food webs: effects of N inputs from agricultural watersheds, Can. J. Fish. Aquat. Sci., 62, 333, 10.1139/f04-191 Anderson, 2007, Estimating the trophic position of aquatic consumers in river food webs using stable nitrogen isotopes, J. N. Am. Benthol. Soc., 26, 273, 10.1899/0887-3593(2007)26[273:ETTPOA]2.0.CO;2 Batt, 2012, Resources supporting the food web of a naturally productive lake, Limnol. Oceanogr., 57, 1443, 10.4319/lo.2012.57.5.1443 Baumgartner, 2017, Changes in macroinvertebrate trophic structure along a land-use gradient within a lowland stream network, Aquat. Sci., 79, 407, 10.1007/s00027-016-0506-z Blanchette, 2014, Omnivory and opportunism characterize food webs in a large dry-tropics river system, Freshwater Science, 33, 142, 10.1086/674632 Boëchat, 2011, Agricultural land-use affects the nutritional quality of stream microbial communities: nutritional quality of stream microbial communities, FEMS Microbiol. Ecol., 77, 568, 10.1111/j.1574-6941.2011.01137.x Brett, 2017, How important are terrestrial organic carbon inputs for secondary production in freshwater ecosystems?, Freshw. Biol., 62, 833, 10.1111/fwb.12909 Brito, 2006, Stable isotope analysis indicates microalgae as the predominant food source of fauna in a coastal forest stream, south-east Brazil, Austral Ecology, 31, 623, 10.1111/j.1442-9993.2006.01610.x Bunn, 2003, Sources of organic carbon supporting the food web of an arid zone floodplain river, Freshw. Biol., 48, 619, 10.1046/j.1365-2427.2003.01031.x Carroll, 2016, Autochthony in Karst Spring food webs, Hydrobiologia, 776, 173, 10.1007/s10750-016-2750-6 Clapcott, 2003, Can C4 plants contribute to aquatic food webs of subtropical streams?, Freshw. Biol., 48, 1105, 10.1046/j.1365-2427.2003.01077.x Clarke, 2006 Cremona, 2010, Influence of functional feeding groups and spatiotemporal variables on the δ15N signature of littoral macroinvertebrates, Hydrobiologia, 647, 51, 10.1007/s10750-009-9798-5 Dalu, 2015, Assessment of the spatial and temporal variations in periphyton communities along a small temperate river system: a multimetric and stable isotope analysis approach, S. Afr. J. Bot., 100, 203, 10.1016/j.sajb.2015.05.028 Dalu, 2014, Using multivariate analysis and stable isotopes to assess the effects of substrate type on phytobenthos communities, Inland Waters, 4, 397, 10.5268/IW-4.4.719 Dalu, 2014, Phytoplankton community diversity along a river-estuary continuum, Transactions of the Royal Society of South Africa, 69, 107, 10.1080/0035919X.2014.930074 Dalu, 2016, Nature and source of suspended particulate matter and detritus along an austral temperate river–estuary continuum, assessed using stable isotope analysis, Hydrobiologia, 767, 95, 10.1007/s10750-015-2480-1 Day, 2001, Guides to the freshwater invertebrates of Southern Africa, Vol. 3 Day, J. A., N. A. Rayner, M. Hamer, L. Brendonck, M. T. Seaman, D. J. Kok, and M. Watson. 1999. Guides to the Freshwater Invertebrates of Southern Africa - Crustacea I. p. 136. Water Research Commission, South Africa. Day, J. A., B. A. Stewart, I. J. De Moor, and A. E. Louw. 2001. Guides to the Freshwater Invertebrates of Southern Africa. Vol. 4: Crustacea III. Technical, Water Research Commission, South Africa. de Moor, 2003, 288 Delong, 2006, Significance of instream autotrophs in trophic dynamics of the upper Mississippi River, Oecologia, 147, 76, 10.1007/s00442-005-0241-y Delong, 2001, Responses of consumers and food resources to a high magnitude, unpredicted flood in the upper Mississippi River basin, Regul. Rivers Res. Manag., 17, 217, 10.1002/rrr.614 Department of Water Affairs South Africa Dickens, 2002, The South African Scoring System (SASS) version 5 rapid bioassessment method for rivers, Afr. J. Aquat. Sci., 27, 1, 10.2989/16085914.2002.9626569 Finlay, 2001, Stable carbon isotope ratios of river biota: implications for energy flow in lotic food webs, Ecology, 82, 1052 France, 1996, Stable isotopic survey of the role of macrophytes in the carbon flow of aquatic food webs, Vegetatio, 124, 67, 10.1007/BF00045145 Fry, 1991, Stable isotope diagrams of freshwater food webs, Ecology, 72, 2293, 10.2307/1941580 Fry, 2006 Gulis, 2006, Stimulation of leaf litter decomposition and associated fungi and invertebrates by moderate eutrophication: implications for stream assessment, Freshw. Biol., 51, 1655, 10.1111/j.1365-2427.2006.01615.x Hadwen, 2007, Food webs of two intermittently open estuaries receiving 15N-enriched sewage effluent, Estuar. Coast. Shelf Sci., 71, 347, 10.1016/j.ecss.2006.08.017 Hadwen, 2007, Gut content- and stable isotope-derived diets of four commercially and recreationally important fish species in two intermittently open estuaries, Mar. Freshw. Res., 58, 363, 10.1071/MF06157 Hamilton, 2005, Separation of algae from detritus for stable isotope or ecological stoichiometry studies using density fractionation in colloidal silica, Limnol. Oceanogr. Methods, 3, 149, 10.4319/lom.2005.3.149 Hellmann, 2013, Omnivores as seasonally important predators in a stream food web, Freshwater Science, 32, 548, 10.1899/12-020.1 Hicks, 1997, Food webs in forest and pasture streams in the Waikato region, New Zealand: a study based on analyses of stable isotopes of carbon and nitrogen, and fish gut contents, N. Z. J. Mar. Freshw. Res., 31, 651, 10.1080/00288330.1997.9516796 Hixson, 2015, Production, distribution, and abundance of long-chain omega-3 polyunsaturated fatty acids: a fundamental dichotomy between freshwater and terrestrial ecosystems, Environ. Rev., 23, 414, 10.1139/er-2015-0029 Hladyz, 2012, Temporal variations in organic carbon utilization by consumers in a lowland river, River Res. Appl., 28, 513, 10.1002/rra.1467 Hoeinghaus, 2007, Landscape scale hydrologic characteristics differentiate patterns of carbon flow in large-river food webs, Ecosystems, 10, 1019, 10.1007/s10021-007-9075-2 Huang, 2007, Food web structure of a subtropical headwater stream, Mar. Freshw. Res., 58, 596, 10.1071/MF06127 Huryn, 2001, Temporal shift in contribution of terrestrial organic matter to consumer production in a grassland river, Freshw. Biol., 46, 213, 10.1046/j.1365-2427.2001.00648.x Jepsen, 2002, Structure of tropical river food webs revealed by stable isotope ratios, Oikos, 96, 46, 10.1034/j.1600-0706.2002.960105.x Kleynhans, 2005, 117 Lancaster, 2005, Intraguild omnivory in predatory stream insects, J. Anim. Ecol., 74, 619, 10.1111/j.1365-2656.2005.00957.x Larson, 2013, Fatty acid composition at the base of aquatic food webs is influenced by habitat type and watershed land use, PLoS One, 8, 10.1371/journal.pone.0070666 Leigh, 2010, Dynamic stability in dry season food webs within tropical floodplain rivers, Mar. Freshw. Res., 61, 357, 10.1071/MF09107 Madsen, 1991, Photosynthetic carbon assimilation in aquatic macrophytes, Aquat. Bot., 41, 5, 10.1016/0304-3770(91)90037-6 March, 2003, Food web structure and basal resource utilization along a tropical island stream continuum, Puerto Rico, Biotropica, 35, 84 Martínez del Rio, 2009, Isotopic ecology ten years after a call for more laboratory experiments, Biol. Rev., 84, 91, 10.1111/j.1469-185X.2008.00064.x McCutchan, 2003, Variation in trophic shift for stable isotope ratios of carbon, nitrogen, and sulfur, Oikos, 102, 378, 10.1034/j.1600-0706.2003.12098.x Merritt, 1996 Moore, 2008, Incorporating uncertainty and prior information into stable isotope mixing models, Ecol. Lett., 11, 470, 10.1111/j.1461-0248.2008.01163.x Moyo, 2017, Decoupled reciprocal subsidies of biomass and fatty acids in fluxes of invertebrates between a temperate river and the adjacent land, Aquat. Sci., 79, 689, 10.1007/s00027-017-0529-0 Moyo, 2018, Fatty acids reveal the importance of autochthonous non-vascular plant inputs to an austral river food web, Hydrobiologia, 806, 139, 10.1007/s10750-017-3347-4 Newsome, 2007, A niche for isotopic ecology, Front. Ecol. Environ., 5, 429, 10.1890/1540-9295(2007)5[429:ANFIE]2.0.CO;2 Parnell, 2013, Bayesian stable isotope mixing models, Environmetrics, 24, 387 Phillips, 2014, Best practices for use of stable isotope mixing models in food-web studies, Can. J. Zool., 92, 823, 10.1139/cjz-2014-0127 Phillips, 2005, Combining sources in stable isotope mixing models: alternative methods, Oecologia, 144, 520, 10.1007/s00442-004-1816-8 Pingram, 2014, Spatial and temporal patterns of carbon flow in a temperate, large river food web, Hydrobiologia, 729, 107, 10.1007/s10750-012-1408-2 Post, 2002, Using stable isotopes to estimate trophic position: models, methods, and assumptions, Ecology, 83, 703, 10.1890/0012-9658(2002)083[0703:USITET]2.0.CO;2 Raikow, 2001, Bivalve diets in a midwestern US stream: a stable isotope enrichment study, Limnol. Oceanogr., 46, 514, 10.4319/lo.2001.46.3.0514 Reid, 2008, Terrestrial detritus supports the food webs in lowland intermittent streams of south-eastern Australia: a stable isotope study, Freshw. Biol., 53, 2036, 10.1111/j.1365-2427.2008.02025.x Reynolds, 1994, Are phytoplankton dynamics in rivers so different from those in shallow lakes?, Hydrobiologia, 289, 1, 10.1007/BF00007404 Richoux, 2018, Spatial and temporal variability in the nutritional quality of basal resources along a temperate river/estuary continuum, Org. Geochem., 116, 1, 10.1016/j.orggeochem.2017.11.009 Rosemond, 2015, Experimental nutrient additions accelerate terrestrial carbon loss from stream ecosystems, Science, 347, 1142, 10.1126/science.aaa1958 Thorp, 2017, Carbon Sources in Riverine Food Webs: New Evidence from Amino Acid Isotope Techniques, Ecosystems, 20, 1029, 10.1007/s10021-016-0091-y Thorp, 1994, The riverine productivity model: an heuristic view of carbon sources and organic processing in large river ecosystems, Oikos, 70, 305, 10.2307/3545642 Thorp, 1998, Isotopic analysis of three food web theories in constricted and floodplain regions of a large river, Oecologia, 117, 551, 10.1007/s004420050692 Vannote, 1980, The river continuum concept, Can. J. Fish. Aquat. Sci., 37, 130, 10.1139/f80-017 Wallace, 1997, Multiple trophic levels of a forest stream linked to terrestrial litter inputs, Science, 277, 102, 10.1126/science.277.5322.102 Wang, 2014, Terrestrial contributions to the aquatic food web in the middle Yangtze River, PLoS One, 9 Ward, 2010, Including source uncertainty and prior information in the analysis of stable isotope mixing models, Environ. Sci. Technol., 44, 4645, 10.1021/es100053v Wootton, 2012, River food web response to large-scale riparian zone manipulations, PLoS One, 7, 10.1371/journal.pone.0051839 Zah, 2001, Stable isotope analysis of macroinvertebrates and their food sources in a glacier stream, Freshw. Biol., 46, 871, 10.1046/j.1365-2427.2001.00720.x Zeug, 2008, Evidence supporting the importance of terrestrial carbon in a large-river food web, Ecology, 89, 1733, 10.1890/07-1064.1