Nonindigenous biota on artificial structures: could habitat creation facilitate biological invasions?
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We identified different distributions of marine nonindigenous species (NIS) and native species on some artificial structures versus natural reefs and using experimental manipulations, revealed some possible causal mechanisms. In well-established subtidal assemblages, numbers of NIS were 1.5–2.5 times greater on pontoons or pilings than on rocky reefs, despite the local species pool of natives being up to 2.5 times greater than that of NIS. Conversely, on reefs and seawalls, numbers of native species were up to three times greater than numbers of NIS. Differential recruitment to different positions and types of surfaces appeared to influence distribution patterns. NIS recruited well to most surfaces, particularly concrete surfaces near the surface of the water, whilst natives occurred infrequently on wooden surfaces. The position of rocky reefs and seawalls close to the shore and to the seabed appeared to make them favourable for the recruitment of natives, but this positioning alone does not hinder the recruitment of NIS. We argue that pontoons and pilings represent beachheads (i.e. entry points for invasion) for many nonindigenous epibiota and so enhance the spread and establishment of NIS in estuaries. Habitat creation in estuaries may, therefore, be a serious threat to native biodiversity.
KeywordsArtificial Structure Rocky Reef Wooden Panel Wooden Piling Native Alga
We thank D. Gordon, P. Mather, G. Rouse and G. Woerheide for help with identifying species, and P. Hutchings, J. Lewis, J. Watson and R. Willan for insights into the native or introduced status of species. All experiments were funded by the Centre for Research on Ecological Impacts of Coastal Cities, and complied with current laws in Australia. Thanks to R. Reinfrank and S. Gartenstein for help with field work. Some ideas in this manuscript have benefited from discussions with F. Bulleri, J.T. Carlton, S. Dworjanyn, M.J. Keough, G. Paloma and G.W. Rouse.
- Carlton JT (1985) Transoceanic and interoceanic dispersal of coastal marine organisms: the biology of ballast water. Annu Rev Oceanogr Mar Biol 23:313–371Google Scholar
- Carlton JT (1987) Patterns of transoceanic marine biological invasions in the Pacific Ocean. Bull Mar Sci 41:452–465Google Scholar
- Coe WR (1932) Season of attachment and rate of growth of sedentary marine organisms at the pier of the Scripps Institution of Oceanography, La Jolla, California. Bull Scripps Inst Oceanogr Tech Ser 3:37–86Google Scholar
- Cohen AN, Harris LH, Bingham BL, Carlton JT, Chapman JW, Lambert CC, Lambert G, Ljubenkov JC, Murray SN, Rao LC, Reardon K, Schwindt E (2005) Rapid assessment survey for exotic organisms in southern California bays and harbors, and abundance in port and non-port areas. Biol Inv 7:995–1002CrossRefGoogle Scholar
- Glasby TM, Connell SD (1999) Urban structures as marine habitats. Ambio 28:595–598Google Scholar
- Hewitt CL, Campbell ML, Thresher RE, Martin RB, Boyd S, Cohen BF, Currie DR, Gomon MF, Keough MJ, Lewis JA, Lockett MM, Mays N, McArthur MA, O’Hara TD, Poore GCB, Jeff Ross D, Storey MJ, Watson JE, Wilson RS (2004) Introduced and cryptogenic species in Port Phillip Bay, Victoria, Australia. Mar Biol 144:183–202CrossRefGoogle Scholar
- Lambert G (2003) Marine biodiversity of Guam: the Ascidiacea. Micronesica 35–36:588–597Google Scholar
- Sala OE, Chapin III FS, Armesto JJ, Berlow E, Bloomfield J, Dirzo R, Huber-Sanwald E, Huenneke LF, Jackson RB, Kinzig A, Leemans R, Lodge DM, Mooney HA, Oesterheld M, Poff NL, Sykes MT, Walker BH, Walker M, Wall DH (2000) Global biodiversity scenarios for the year 2100. Science 287:1770–1774CrossRefGoogle Scholar
- Simberloff D (1997) The biology of invasions. In: Simberloff D, Schmitz DC, Brown TC (eds) Strangers in paradise: impact and management of nonindigenous species in Florida. Island Press, Washington, pp 3–19Google Scholar