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Abstract
We measured the extent of movement of carbon and its assimilation by invertebrates among estuarine habitats by analysing carbon stable isotopes of invertebrates collected along transects crossing the boundary of two habitats. The habitats were dominated by autotrophs with distinct isotope values: (1) mudflats containing benthic microalgae (mean −22.6, SE 0.6‰) and (2) seagrass and its associated epiphytic algae (similar values, pooled mean −9.8, 0.5‰). Three species of invertebrates were analysed: a palaemonid shrimp,Macrobrachium intermedium, and two polychaete worms,Nephtys australiensis andAustralonereis ehlersi. All species had a similar narrow range of isotope values (−9 to −14‰), and showed no statistically significant relationship between position along transect and isotope values. Animals were relying on carbon from seagrass meadows whether they were in seagrass or on mudflats hundreds of metres away. Particulate organic matter collected from superficial sediments along the transects had similar values to animals (mean −11.1, SE 1.3‰) and also showed no significant relationship with position. The isotope values of these relatively immobile invertebrates and the particulate detritus suggest that carbon moves from subtidal seagrass meadows to mudflats as particulate matter and is assimilated by invertebrates. This assimilation might be direct in the case of the detritivorous worm,A. ehlersi, but must be via invertebrate prey in the case of the carnivorous worm,N. australiensis and the scavenging shrimp,M. intermedium. The extent of movement of carbon among habitats, especially towards shallower habitats, is surprising since in theory, carbon is more likely to move offshore in situations such as the current study where habitats are in relatively open, unprotected waters.
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Acknowledgements
We thank R. Diocares for mass spectrometry assistance and the marine ecology group at Griffith University for improving the manuscript. We gratefully acknowledge funding support from Fisheries R&D Corporation and the Cooperative Research Centre for Coastal Zone, Estuary and Waterway Management.
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Daniel Gorman
Present address: Southern Seas Ecology Laboratories, University of Adelaide, Adelaide, SA, 5005, Australia
Michaela A. Guest
Present address: Tasmanian Aquaculture and Fisheries Institute, University of Tasmania, GPO Box 252, Hobart, TAS, 7001, Australia
Authors and Affiliations
Centre for Aquatic Processes and Pollution, and School of Environmental and Applied Sciences, Griffith University, PMB 50, Gold Coast Mail Centre, Brisbane, QLD, 9726, Australia
Rod M. Connolly, Daniel Gorman & Michaela A. Guest
Cooperative Research Centre for Coastal Zone, Estuary and Waterway Management, Indooroopilly, QLD, 4068, Australia
Rod M. Connolly & Michaela A. Guest
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Correspondence toRod M. Connolly.
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Communicated by Jim Ehleringer
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Connolly, R.M., Gorman, D. & Guest, M.A. Movement of carbon among estuarine habitats and its assimilation by invertebrates.Oecologia144, 684–691 (2005). https://doi.org/10.1007/s00442-005-0167-4
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