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Productivity influences trophic structure in a temporally forced aquatic ecosystem

Journal Article


Abstract


  • Previous studies on the relationship between ecosystem productivity, size and food-chain length have been restricted to comparisons between locations. We examined the effect of temporal variability in productivity on trophic structure of a floodplain ecosystem, hypothesising that during the wet-flood pulses, the increased resource availability might lead to higher food-chain lengths. We examined multiple common sampling locations and species during a severe El Niño drought which followed a consecutive series of historically wet La Niña years, comparing trophic position and dietary sources. While carbon stable isotopes showed no significant difference between the two phases, nitrogen stable isotopes indicated that most species were feeding higher in the food chain in the wet phase. The results suggest that oscillations in climate phase-driven changes have effects on food-chain lengths through changes in productivity, without the introduction of new sources of carbon or changes to the composition of higher-order predators.

Authors


  •   Mazumder, Debashish (external author)
  •   Saintilan, Neil (external author)
  •   Wen, Li (external author)
  •   Kobayashi, Tsuyoshi (external author)
  •   Rogers, Kerrylee

Publication Date


  • 2017

Citation


  • Mazumder, D., Saintilan, N., Wen, L., Kobayashi, T. & Rogers, K. (2017). Productivity influences trophic structure in a temporally forced aquatic ecosystem. Freshwater Biology, 62 (9), 1528-1538.

Scopus Eid


  • 2-s2.0-85021793355

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/4809

Has Global Citation Frequency


Number Of Pages


  • 10

Start Page


  • 1528

End Page


  • 1538

Volume


  • 62

Issue


  • 9

Place Of Publication


  • United Kingdom

Abstract


  • Previous studies on the relationship between ecosystem productivity, size and food-chain length have been restricted to comparisons between locations. We examined the effect of temporal variability in productivity on trophic structure of a floodplain ecosystem, hypothesising that during the wet-flood pulses, the increased resource availability might lead to higher food-chain lengths. We examined multiple common sampling locations and species during a severe El Niño drought which followed a consecutive series of historically wet La Niña years, comparing trophic position and dietary sources. While carbon stable isotopes showed no significant difference between the two phases, nitrogen stable isotopes indicated that most species were feeding higher in the food chain in the wet phase. The results suggest that oscillations in climate phase-driven changes have effects on food-chain lengths through changes in productivity, without the introduction of new sources of carbon or changes to the composition of higher-order predators.

Authors


  •   Mazumder, Debashish (external author)
  •   Saintilan, Neil (external author)
  •   Wen, Li (external author)
  •   Kobayashi, Tsuyoshi (external author)
  •   Rogers, Kerrylee

Publication Date


  • 2017

Citation


  • Mazumder, D., Saintilan, N., Wen, L., Kobayashi, T. & Rogers, K. (2017). Productivity influences trophic structure in a temporally forced aquatic ecosystem. Freshwater Biology, 62 (9), 1528-1538.

Scopus Eid


  • 2-s2.0-85021793355

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/4809

Has Global Citation Frequency


Number Of Pages


  • 10

Start Page


  • 1528

End Page


  • 1538

Volume


  • 62

Issue


  • 9

Place Of Publication


  • United Kingdom