Abstract
Mangroves are traditionally considered to provide important nutrition to tropical estuarine consumers. However, there is still controversy about this, and the extent and importance of these inputs are largely unquantified. In particular, there is no information for food webs of small estuaries that dominate wet–dry tropical coasts, where freshwater inflow is intermittent, leading to highly seasonal inputs of nutrients from terrestrial systems. Since the relative importance of the different sources depends on the type and extent of different habitats and on hydrological and topographic conditions, results from other regions/type of systems cannot be extrapolated to these estuaries. Here, δ13C is used to determine the importance of mangrove-derived carbon for Penaeus merguiensis (detritivore; shrimp), Ambassis vachellii (planktivore; fish), and Leiognathus equulus (benthivore; fish) from six small wet–dry tropical estuaries that differ in mangrove (C3) cover and in type of terrestrial vegetation adjacent to the estuary. Bayesian mixing models confirmed that mangrove material was important to consumers in all estuaries. There was a gradient in this importance that agreed with the extent of mangrove forests in the estuaries, as C3 sources were the most important contributors to animals from the three estuaries with the greatest (>40 %) mangrove cover. There was also evidence of incorporation of C3 material for the three estuaries with lower (<30 %) mangrove cover. Since these latter estuaries had no adjacent terrestrial C3 forests, the detected C3 influence can only be of mangrove origin. This shows that mangroves are important contributors to these food webs, underlining the importance of mangroves in supporting estuarine nursery ground value and fisheries productivity.
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We thank the many volunteers, in particular A. Johnson for field assistance. This research was supported by an Australian Government Marine and Tropical Sciences Research Facility (MTSRF) grant to MS and RMC, and by a Winifred Violet Scott Foundation grant to KGA. Work was conducted in accordance with institutional, national, and international guidelines concerning the use of animals in research, under the Ethics Permit A1210 from James Cook University. We also thank the anonymous reviewers for their insightful comments.
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Abrantes, K.G., Johnston, R., Connolly, R.M. et al. Importance of Mangrove Carbon for Aquatic Food Webs in Wet–Dry Tropical Estuaries. Estuaries and Coasts 38, 383–399 (2015). https://doi.org/10.1007/s12237-014-9817-2
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DOI: https://doi.org/10.1007/s12237-014-9817-2