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Type: Journal article
Title: Movement of carbon among estuarine habitats and its assimilation by invertebrates
Author: Connolly, R. M.
Gorman, Daniel
Guest, Michaela A.
Citation: Oecologia, 2005; 144(4):684-691
Publisher: Springer
Issue Date: 2005
ISSN: 0029-8549
School/Discipline: School of Earth and Environmental Sciences
Statement of
Rod M. Connolly, Daniel Gorman and Michaela A. Guest
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 and Australonereis 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.
Keywords: Crustacea; Estuary; Polychaeta; Stable isotopes; Trophic subsidy
DOI: 10.1007/s00442-005-0167-4
Appears in Collections:Earth and Environmental Sciences publications

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