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RESEARCH ARTICLE
Contents Vol 61(8)

Food web dynamics in an Australian Wet Tropics river

Thomas S. Rayner A D E , Bradley J. Pusey B , Richard G. Pearson A and Paul C. Godfrey C
+ Author Affiliations
- Author Affiliations

A School of Marine and Tropical Biology, James Cook University, Townsville, Qld 4811, Australia.

B Tropical Rivers and Coastal Knowledge, Australian Rivers Institute, Griffith University, Nathan, Qld 4111, Australia.

C Australian Rivers Institute, Griffith University, Nathan, Qld 4111, Australia.

D Present address: School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW 2052, Australia.

E Corresponding author. Email: thomas.rayner@unsw.edu.au

Marine and Freshwater Research 61(8) 909-917 https://doi.org/10.1071/MF09202
Submitted: 13 August 2009  Accepted: 4 January 2010   Published: 13 August 2010

Abstract

In Australia’s Wet Tropics rivers, perennial base flows punctuated by wet season floods drive instream responses across a range of spatial and temporal scales. We combined gut-content and stable-isotope analyses to produce preliminary webs depicting trophic links between fish, their main prey items and basal productivity sources. We then used these webs to test the applicability of general food web principles developed in other tropical systems. Although a range of sources appeared to underpin fish productivity, a large portion of total energy transfer occurred through a subset of trophic links. Variability in food web structure was negatively correlated with spatial scale, being seasonally stable at river reaches and variable at smaller scales. Wet Tropics rivers are similar to those in other tropical areas, but exhibit some unique characteristics. Their high degree of channel incision improves longitudinal connectivity, thereby allowing fish to move between mesohabitats and target their preferred prey items, rather than shifting their diet as resources fluctuate. However, this also inhibits lateral connectivity and limits terrestrial energy inputs from beyond the littoral zone.

Additional keywords: connectance, disturbance, flood, movement, pulse, scaling, seasonality.


Acknowledgements

This project was funded by grants from the Cooperative Research Centre for Tropical Rainforest Ecology and Management (Rainforest CRC) and James Cook University (JCU). Fish were collected under Queensland Department of Primary Industries – Fisheries permit PRM03040F and JCU Animal Care and Ethics permit A818_03. In-kind support was provided by Queensland Department of Primary Industries – Fisheries and Richard Hunt, Queensland Department of Natural Resources and Water. Field assistance was provided by Colton Perna, Zoe Baker, Paul Thuesen, Paul Godfrey, Amanda Soymonoff, Mo Healy, Anne Gulliard, Megan Barnes, Cameron Crothers-Stomp, Andrew Kaus, Andrew Jones, Rusty Ligon and Michael Pusey. Access to private land and other assistance in the field was provided by the Rossi, Thomasen and Moller families.


References

Arthington, A. H. , Balcombe, S. R. , Wilson, G. A. , Thoms, M. , and Marshall, J. (2005). Spatial and temporal variation in fish-assemblage structure in isolated waterholes during the 2001 dry season of an arid-zone floodplain river, Cooper Creek, Australia. Marine and Freshwater Research 56, 25–35.
| Crossref | GoogleScholarGoogle Scholar | Bishop K. A., Allen S. A., Pollard D. A., and Cook M. G. (2001). Ecological studies on the freshwater fishes of the Alligator Rivers Region, Northern Territory: Autecology. Office of the Supervising Scientist, Report 145, Darwin, Australia.

Bunn, S. E. , Davies, P. M. , and Kellaway, D. M. (1997). Contributions of sugar cane and invasive pasture grass to the aquatic food web of a tropical lowland stream. Marine and Freshwater Research 48, 173–179.
| Crossref | GoogleScholarGoogle Scholar | Bunn S., Tenakanai C., and Storey A. (1999). Energy sources supporting Fly River fish communities. Report to Ok Tedi Mining Limited Environment Department. Available from: http://www.oktedi.com/attachments/218_MWMP_EnergySources.pdf

Douglas, M. M. , Bunn, S. E. , and Davies, P. M. (2005). River and wetland food webs in Australia’s wet-dry tropics: general principles and implications for management. Marine and Freshwater Research 56, 329–342.
| Crossref | GoogleScholarGoogle Scholar | Finlayson B. L., and McMahon T. A. (1988). Australia v. the World: a comparative analysis of streamflow characteristics. In ‘Fluvial Geomorphology of Australia’. (Ed. R. F. Warner.) pp. 1–16. (Academic Press: Sydney.)

Forsberg, B. R. , Araujo-Lima, C. A. R. M. , Martinelli, L. A. , Victoria, R. L. , and Bonassi, J. A. (1993). Autotrophic carbon sources for fish of the Central Amazon. Ecology 74, 643–652.
| Crossref | GoogleScholarGoogle Scholar | Goulding M. (1980). ‘Fishes and the Forest: Explorations in Amazonian Natural History.’ (University of California Press: Berkeley.)

Hamilton, S. K. , Lewis, W. M. , and Sippel, S. J. (1992). Energy sources for aquatic animals in the Orinoco River floodplain: evidence from stable isotopes. Oecologia 89, 324–330.
Kent S. (2001). Top-down control in a stream community under contrasting flow regimes. Honours thesis. Northern Territory University, Darwin.

Lowe-McConnell R. H. (1987). ‘Ecological Studies in Tropical Fish Communities.’ (Cambridge University Press: New York.)

Marchant, R. (1982). Seasonal variation in the macroinvertebrate fauna of billabongs along Magela Creek, Northern Territory. Marine and Freshwater Research 33, 329–342.
| Crossref | GoogleScholarGoogle Scholar | Pusey B. J., Kennard M. J., and Arthington A. H. (2004). ‘Freshwater Fishes of Northeastern Australia.’ (CSIRO Publishing: Melbourne.)

Rayner, T. S. , Pusey, B. J. , and Pearson, R. G. (2008). Seasonal flooding, instream habitat structure and fish assemblages in the Mulgrave River, north-east Queensland: towards a new conceptual framework for understanding fish-habitat dynamics in small tropical rivers. Marine and Freshwater Research 59, 97–116.
| Crossref | GoogleScholarGoogle Scholar | Russell D. J., Hales P. W., and Helmke S. A. (1996). Stream habitat and fish resources in the Russell and Mulgrave Rivers catchment. Queensland Department of Primary Industries, Northern Fisheries Centre, Cairns.

Solow, A. R. , and Beet, A. R. (1998). On lumping species in food webs. Ecology 79, 2013–2018.
| Crossref | GoogleScholarGoogle Scholar | Veitch V., and Sawynok B. (2005). Importance of freshwater wetlands to marine fisheries resources in the Great Barrier Reef. Sunfish Queensland, SQ200401, Townsville.

Winemiller K. O. (2005). Floodplain river food webs: generalisations and implications for fisheries management. In ‘Second International Symposium on the Management of Large Rivers for Fisheries. Phnom Penh, Cambodia’. (Eds R. L. Welcomme and T. Petr.) pp. 285–309. (Mekong River Commission: Phnom Penh.)

Winemiller, K. O. , and Jepsen, D. B. (1998). Effects of seasonality and fish movement on tropical river food webs. Journal of Fish Biology 53, 267–296.
| Crossref | GoogleScholarGoogle Scholar | Wirf L. (2003). Spatial variation in top-down control in an Australian tropical stream. Honours thesis. Charles Darwin University, Darwin.

Zeug, S. C. , and Winemiller, K. O. (2008). Evidence supporting the importance of terrestrial carbon in a large-river food web. Ecology 89, 1733–1743.
| Crossref | GoogleScholarGoogle Scholar | PubMed |