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Hawaiian Marine Bioinvasions: A Preliminary Assessment

From: Pacific Science
Volume 56, Number 2, April 2002
pp. 211-212 | 10.1353/psc.2002.0012

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Hawaiian Marine Bioinvasions: A Preliminary Assessment1 L. G. Eldredge2 and J. T. Carlton3 Through the Hawaii Biological Survey at Bishop Museum, a count of the total numbers of species in the Hawaiian Archipelago has been accumulated, with the latest listing (1999) totalling 23,150, of which 5047 are nonindigenous species (Eldredge 2000). For the nonindigenous marine and estuarine species, we have been accumulating information from the literature, museum specimens, and through field collections. This preliminary assessment is an extended abstract of a much longer review still in preparation ( J.T.C. and L.G.E., unpubl. data). Using the criteria of Chapman and Carlton (1991), we have calculated that the total number of marine and brackish-water species in the Hawaiian Islands is 343: 287 invertebrates, 24 algae, 20 fish, and 12 flowering plants. Of a total of 4099 marine invertebrate species, 71 species are introduced arthropods and 53 species are mollusks (Eldredge and DeFelice 2001). The greatest number of introduced species arrived through hull fouling, with solid ballast and ballast water following (Table 1). Two hundred and one species (70%) are considered introduced and 86 species (30%) cryptogenic (that is, not demonstratively native or introduced). Two hundred forty-eight species (87%) have become established, 15 (5%) failed, 6 (2%) were intercepted, and 18 (6%) unknown. The nonindigenous species have their origins primarily in the Indo-Pacific/Philippine Islands region (Table 2). Historically the numbers of introductions have peaked at several different times: during the 1920s, probably through the effort of Charles Howard Edmondson, then recently arrived invertebrate zoologist at the University of Hawai‘i and Bishop Museum; during the 1940s, probably through wartime activities and development; during the 1970s, through surveys conducted by the U.S. Navy; and during the 1990s and the current series of biological inventories of intensity. 211 Pacific Science (2002), vol. 56, no. 2:211–212 : 2002 by University of Hawai‘i Press. All rights reserved 1 Extended abstract of paper presented at the Ninth International Coral Reef Symposium, Bali, Indonesia, 27 October 2000. Manuscript accepted 5 September 2001. 2 Bishop Museum, 1525 Bernice Street, Honolulu, Hawai‘i 96817. 3 Maritime Studies Program, P.O. Box 6000, Mystic, Connecticut 06355. TABLE 1 Marine Invertebrates: Probable Mechanisms of Transport to the Hawaiian Islands Mechanism Species % Established Hull fouling 212 90 Solid ballast 21 90 Ballast water 18 89 Intentional release: fishery 18 28 Parasites on nonindigenous species 888 With commercial oysters: unintentional 7 100 Aquarium release 3 67 TABLE 2 Biogeography of Marine Nonindigenous Species in the Hawaiian Islands Origin % Indo-Pacific, Philippines 21.3 Unknown 19.9 Unknown, worldwide 16.4 Tropical western Atlantic (Caribbean) 10.5 Japan-Asia 7.0 NW Atlantic (Europe and Mediterranean) 6.6 West coast North America 6.3 Southern Hemisphere 2.8 Australia and New Zealand 2.4 Tropical eastern Pacific 2.4 Oceania 2.1 Other 2.3 (V7 15/3 14:14) UHP/U J-9577 Pacific, 56:2 AC:(1)1/3/2002 (0).3.05.05 Janson pp. 211–212 Ch09_P (p. 211) In harbors and embayments in Hawai‘i the percentage of nonindigenous species increases greatly: 23% for Pearl Harbor, 17% for Honolulu Harbor, but 1.5% and 1.0% for Midway Island and Kaho‘olawe, respectively (Coles and Eldredge 2002). As information becomes available it suggests that a gradient in the diversity of introduced species exists from intensive to less intensive regions of both shipping traffic and estuarine modification and urbanization. acknowledgments We thank Ralph DeFelice for the data input from which the numbers given here were extracted. Literature Cited Chapman, J. W., and J. T. Carlton. 1991. A test of criteria for introduced species: The global invasion by the isopod Synidotea laevidorsalis (Miers, 1881). J. Crustacean Biol. 11:386–400. Coles, S. L., and L. G. Eldredge. 2002. Nonindigenous species introductions on coral reefs: A need for information. Pac. Sci. 56:191–209. Eldredge, L. G. 2000. Numbers of Hawaiian species. Supplement 5. Bishop Mus. Occas. Pap. 63:308. Eldredge, L. G., and R. C. DeFelice. 2001. Checklist of the Hawaiian marine invertebrates (http://www2.bishopmuseum.org/ HBS/invert/list_home.htm). Hawaii Biological Survey, Bishop Museum, Honolulu. (V7 15/3 14...

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