Invasions in Marine Communities: Contrasting Species Richness and Community Composition Across Habitats and Salinity
While many studies of non-native species have examined either soft-bottom or hard-bottom marine communities, including artificial structures at docks and marinas, formal comparisons across these habitat types are rare. The number of non-indigenous species (NIS) may differ among habitats, due to differences in species delivery (trade history) and susceptibility to invasions. In this study, we quantitatively compared NIS to native species richness and distribution and examined community similarity across hard-bottom and soft-sediment habitats in San Francisco Bay, California (USA). Benthic invertebrates were sampled using settlement panels (hard-bottom habitats) and sediment grabs (soft-bottom habitats) in 13 paired sites, including eight in higher salinity areas and five in lower salinity areas during 2 years. Mean NIS richness was greatest in hard-bottom habitat at high salinity, being significantly higher than each (a) native species at high salinity and (b) NIS richness at low salinity. In contrast, mean NIS richness in soft-bottom communities was not significantly different from native species richness in either high- or low-salinity waters, nor was there a difference in NIS richness between salinities. For hard-bottom communities, NIS represented an average of 79% of total species richness per sample at high salinity and 78% at low salinity, whereas the comparable values for soft bottom were 46 and 60%, respectively. On average, NIS occurred at a significantly higher frequency (percent of samples) than native species for hard-bottom habitats at both salinities, but this was not the case for soft-bottom habitats. Finally, NIS contributed significantly to the existing community structure (dissimilarity) across habitat types and salinities. Our results show that NIS richness and occurrence frequency is highest in hard-bottom and high-salinity habitat for this Bay but also that NIS contribute strongly to species richness and community structure across each habitat evaluated.
KeywordsNIS Invasions Estuaries Soft sediments Hard bottoms Community structure
- Carlton, J.T. 1979. Introduced invertebrates of San Francisco Bay. In San Francisco Bay: The urbanized estuary. Investigations into the natural history of San Francisco Bay and Delta with reference to the influence of man, 427–444.Google Scholar
- Carlton, J.T. 2001. Introduced species in U.S. coastal waters: Environmental impacts and management priorities. Arlington, Virginia: Pew Oceans Commission.Google Scholar
- Carlton, J.T. 2007. The light and smith manual: Intertidal invertebrates from Central California to Oregon, completely revised and expanded. 4th ed. Berkeley, California: University of California Press.Google Scholar
- Chang, A.L. 2009. An urban estuary in a changing world: Diversity, invasions, and climate change in San Francisco Bay, 197. University of California, Davis. PhD Dissertation.Google Scholar
- Clarke, K.R., and R.N. Gorley. 2006. PRIMER v6: User manual/tutorial. Plymouth: PRIMER-E.Google Scholar
- Cohen, A.N., and J.T. Carlton. 1995. Non-indigenous aquatic species in a United States estuary: A case study of the biological invasions of the San Francisco Bay and Delta. United States Fish and Wildlife Service, Washington DC and the National Sea Grant College Program Connecticut Sea Grant PB96–166525. Springfield, VA: US Department of Commerce, National Technical Information Service.Google Scholar
- Conomos, T.J. 1979. Properties and circulation of San Francisco Bay waters. In San Francisco Bay, the urbanized estuary, ed. T.J. Conomos, 192–221. San Francisco: American Association for the Advancement of Science, Pacific Division.Google Scholar
- Dauer, D.M., and M.F. Lane. 2005. Side-by-side comparison of Young grab and composite petite Ponar grab samples for the calculation of the Benthic Index of Biological Integrity (B-IBI). In Report for the Chesapeake Bay Program Office.Google Scholar
- Fofonoff, P.W., G.M. Ruiz, B. Steves, J.T. Carlton 2013. NEMESIS National Exotic Marine and Estuarine Species Information System. http://invasions.si.edu/nemesis/Accessed 6 February 2017.
- Hewitt, C.M., R. Campbell, R. Thresher, S. Martin, B. Boyd, D. Cohen, M. Currie, M. Gomon, J. Keough, M. Lewis, N. Lockett, M. Mays, T. McArthur, G. O’Hara, J. Poore, M. Ross, J. Storey, R. Watson, and M. Wilson. 2004. Introduced and cryptogenic and species in Port Phillip Bay. Vol. 144, 183–202. Victoria, Australia: Marine Biology.Google Scholar
- Kozloff, E.N. 1996. Marine invertebrates of the Pacific Northwest with additions and corrections. Seattle, Washington: University of Washington Press.Google Scholar
- Lee, H., B. Thompson, and S. Lowe. 2003. Estuarine and scalar patterns of invasion in the soft-bottom benthic communities of the San Francisco Estuary. Biological Invasions 5 (12): 85–102.Google Scholar
- Marraffini, M.L., and J.B. Geller. 2015. Species richness and interacting factors control invasibility of a marine community. Proceedings of the Royal Society B 282: 20150439. doi: 10.1098/rspb.2015.0439.
- Mooi, R., V.G. Smith, M. Gould Burke, T.M. Gosliner, C.N. Piotrowski, and R.K. Ritger. 2007. Animals of San Francisco Bay: a field guide to the common benthic species. San Francisco, California: California Academy of Sciences.Google Scholar
- Ruiz, G.M., and J.T. Carlton. 2003. Invasion vectors: A conceptual framework for management strategies. Washington: Island Press.Google Scholar
- Ruiz, G.M., A. Freestone, P.W. Fofonoff, and C. Simkanin. 2009. Habitat distribution and heterogeneity in marine invasion dynamics: The importance of hard substrate and artificial structure. In Marine hard bottom communities, ecological studies 206, ed. M. Wahl, 321–332. Berlin: Springer-Verlag.CrossRefGoogle Scholar
- US EPA. 2009. National coastal condition assessment: Field operations manual. EPA-841-R-09-003. Washington D.C.: US Environmental Protection Agency.Google Scholar
- Williams, S.L., I. Davidson J.R. Pasari, G.V. Ashton, J.T. Carlton, R.E Crafton R.E. Fontana E.D. Grosholz A.W. Miller G.M. Ruiz C.J. Zabin 2013. Managing multiple vectors for marine invasions in an increasingly connected world bioscience 63(12): 952–966.Google Scholar
- Williamson, M. 1996. Biological invasions. Vol. 15. Berlin: Springer Science & Business Media.Google Scholar