Abstract
Fishes using mangrove (Avicennia marina) and mudflat habitat were sampled using three different types of gear (seine, fyke, and gill nets) at three sites within each of two large embayments through time (quarterly) between January 2002 and November 2002. At least 41 species of fish were sampled, of which 78% were marine, 17% were estuarine, and 5% were freshwater. Juveniles were sampled in 41% of the species, and 5 and 6 species occurred exclusively in mangrove and mudflat habitats, respectively. The assemblage structure of fishes varied significantly between habitats (for both fyke and seine catches) and between spring and summer (seine catches), but only in one bay. Most of the variability between habitats and times of the year could be explained by differences in abundances of atherinids, mugulids, gobiids, tetraodontids, pleuronectids, and clupeids. Fyke nets sampled mainly juvenile and smaller species of fish. Fish abundance was always greater in mangroves than mudflats (but significantly so at four of the six study sites) and varied significantly between times of the year at one site, while the number of species varied significantly between times of the year at three sites. Gill nets sampled mostly adult/subadult fishes and abundances were greater in mudflats than mangroves at two sites, and in mangroves over mudflats at one site, while species abundance varied between times of the year at two sites. The seine net sampled mainly early post-settlement and small (<20 mm) fishes, more species of which were sampled in mudflat than mangrove during winter and spring, whereas the opposite pattern occurred in summer and autumn. The number of fish sampled with the seine net only varied significantly between habitats in one embayment during summer and spring, when they were larger and smaller, respectively, in mangroves than mudflats. Mangrove habitat in temperate Australian waters supports a richer juvenile fish assemblage than adjacent mudflats, but there is little difference between habitats for the subadult/adult assemblage. Ultimately, the ‘value’ of mangrove habitats to fishes depends strongly on when and where (bays and sites within bays) the study is done.
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Acknowledgements
This research would not have been possible without generous funding from the Fisheries Research and Development Corporation (FRDC 2001/036) and Fisheries Victoria. D. Hatton, S. Blake, and S. Moran helped with fieldwork. D. Ball helped with the preparation of figures. Earlier versions of this manuscript were improved by comments from L. Morris and two anonymous reviewers. This work was done using the facilities at the Primary Industries Research Victoria and the Queenscliff Marine Station.
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Communicated by M.S. Johnson, Crawley
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Hindell, J.S., Jenkins, G.P. Spatial and temporal variability in the assemblage structure of fishes associated with mangroves (Avicennia marina) and intertidal mudflats in temperate Australian embayments. Marine Biology 144, 385–395 (2004). https://doi.org/10.1007/s00227-003-1201-x
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DOI: https://doi.org/10.1007/s00227-003-1201-x