Please use this identifier to cite or link to this item:
https://hdl.handle.net/1959.11/20181
Title: | Changes in the trophic status of fish feeding guilds in response to flow modification | Contributor(s): | Delong, M D (author); Thoms, Martin (author) | Publication Date: | 2016 | DOI: | 10.1002/2015JG003249 | Handle Link: | https://hdl.handle.net/1959.11/20181 | Abstract: | Rivers are among the most extensively modified ecosystems globally. Identifying linkages between critical drivers of change and ecological response is challenging because of the myriad of ways rivers are modified. This study examines longer-term relationships (>70 years) between the trophic status of fish and historical flow changes in rivers of the Mississippi Basin. The flow regime of each river is regulated but differs in terms of character of hydrological modification. Tissue samples from specimens obtained from museum collections were used for determination of carbon and nitrogen stable isotope ratios. Questions asked were as follows: (1) Are there differences in stable isotope ratios of fish feeding guilds prior to and following hydrological modification? (2) What hydrological attributes are associated with isotopic changes? And (3) are corresponding changes in stable isotope ratios and hydrology identifiable across different spatial scales? Significant and sustained changes in stable isotope ratios of fish feeding guilds occurred immediately following flow regulation in all rivers. These changes were not associated with human-induced biogeochemical alterations. The subsequent response was complex because (1) different guilds exhibited pronounced shifts in isotopic ratios, (2) hydrological modification differed between rivers, and (3) differences in stable isotopic ratios varied between spatial scales. | Publication Type: | Journal Article | Source of Publication: | Journal of Geophysical Research: Biogeosciences, 121(3), p. 949-964 | Publisher: | Wiley-Blackwell Publishing, Inc | Place of Publication: | United States of America | ISSN: | 2169-8961 2169-8953 |
Fields of Research (FoR) 2008: | 040607 Surface Processes 040699 Physical Geography and Environmental Geoscience not elsewhere classified |
Fields of Research (FoR) 2020: | 370702 Ecohydrology 370901 Geomorphology and earth surface processes |
Socio-Economic Objective (SEO) 2008: | 970105 Expanding Knowledge in the Environmental Sciences 960699 Environmental and Natural Resource Evaluation not elsewhere classified |
Socio-Economic Objective (SEO) 2020: | 280111 Expanding knowledge in the environmental sciences | Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
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Appears in Collections: | Journal Article School of Humanities, Arts and Social Sciences |
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