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https://hdl.handle.net/1959.11/11387
Title: | The influence of hydrological connectivity on food web structure in floodplain lakes | Contributor(s): | Reid, Michael (author) ; Delong, Michael (author); Thoms, Martin (author) | Publication Date: | 2012 | DOI: | 10.1002/rra.1491 | Handle Link: | https://hdl.handle.net/1959.11/11387 | Abstract: | Hydrological connectivity is an important driver of ecosystem structure in floodplain rivers; however, little is known of how hydrological connectivity affects the structure and functioning of food webs in these systems. This study examines aquatic food web structure in 10 floodplain lakes on a dryland river floodplain in eastern Australia across a connectivity gradient. Results for fishes suggest that benthic carbon sources are more important in high connectivity billabongs than in low connectivity billabongs and that pelagic sources are more important in low connectivity billabongs than in high connectivity billabongs. Fishes in less connected billabongs were also found to feed at higher trophic levels than in more connected billabongs. We hypothesize that in high connectivity billabongs, where suitable benthic primary sources are abundant, common fish species such as carp and bony bream feed as detritivores or herbivores; while in low connectivity billabongs, where benthic sources are less abundant, the same species feed as planktivores, insectivores or piscivores. This dietary difference may also be promoted by greater predation efficiency in less structurally complex low connectivity billabongs. The feeding behaviour of these fish species subsequently influences the trophic positions of fishes higher in the food chain and ultimately the total food chain lengths that high and low connectivity billabongs support. The results of this study highlight the importance of hydrological connectivity to the structure of food webs in these systems and the potential for them to be affected by water resource development. | Publication Type: | Journal Article | Source of Publication: | River Research and Applications, 28(7), p. 827-844 | Publisher: | John Wiley & Sons Ltd | Place of Publication: | United Kingdom | ISSN: | 1535-1467 1535-1459 |
Fields of Research (FoR) 2008: | 060204 Freshwater Ecology 040601 Geomorphology and Regolith and Landscape Evolution |
Fields of Research (FoR) 2020: | 310304 Freshwater ecology 370906 Regolith and landscape evolution |
Socio-Economic Objective (SEO) 2008: | 960506 Ecosystem Assessment and Management of Fresh, Ground and Surface Water Environments 960807 Fresh, Ground and Surface Water Flora, Fauna and Biodiversity |
Socio-Economic Objective (SEO) 2020: | 180502 Assessment and management of pelagic marine ecosystems 180501 Assessment and management of benthic marine ecosystems 180303 Fresh, ground and surface water biodiversity |
Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
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Appears in Collections: | Journal Article |
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