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New Records of the North Pacific Coastal Planktonic Copepods, Acartia Omorii (Acartiidae) and O/Thona Da V/Sae (Oithonidae) from Southern Chile

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New Records of the North Pacific Coastal Planktonic Copepods, Acartia Omorii (Acartiidae) and O/Thona Da V/Sae (Oithonidae) from Southern Chile NOTES 337 Keeton, D. 1965. Application ofStoeltzner's method to determine growth offish scales. Trans. Am. Fish. Soc. 94: 93-94. LaMarca, M. J. 1966. A simple technique for demonstrating calcified annuli in the vertebrae oflarge elasmobranchs. Copeia 1966: 351-352. Moss, M. L. 1977. Skeletal tissues of sharks. Am. Zool. 17: 335-342. Schwartz, F. J. 1983. Shark ageing methods and age estimation of scalloped hammerhead, Sphyrna lewini. and dusky, Carcharhinus obscurus, sharks based on vertebral ring counts. Pages 167-174 in E. D. Prince and L. M. Pulos, eds. Proceedings of the international workshop on age deter- mination of oceanic pelagic fishes: tunas, billfishes, and sharks. NOAA Tech. Rep. NMFS 8. Stevens, 1. D. 1975. Vertebral rings as a means of age determination in the blue shark (Prionace glauca L.). J. Mar. BioI. Assoc. U.K. 55: 657-665. Stoeltzner, W. 1905. Uber metallfarbungen verkalter gewebeteile. Virchow's Archiv. fur Patho!. Nat. Physiol. 180(2): 362-365. Wallin, O. 1957. On the growth structure and developmental physiology ofthe scale of fishes. lnst. Freshw. Res. Rept., Drottningholm, Sweden 38: 385-477. DATEACCEPTED: November 6,1987. ADDRESS: Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rick- enbacker Causeway, Miami, Florida 33149-1098. BULLETINOFMARINESCIENCE.42(2): 337-339.1988 NEW RECORDS OF THE NORTH PACIFIC COASTAL PLANKTONIC COPEPODS, ACARTIA OMORII (ACARTIIDAE) AND O/THONA DA V/SAE (OITHONIDAE) FROM SOUTHERN CHILE Kazumasa Hirakawa In the routine plankton sampling programs of the Japan International Coop- eration Agency (JICA) and Servicio Nacional de Pesca (SERNAP) of the Republic of Chile, zooplankton were collected at approximately monthly intervals with a Norpac net in Ensenada Baja (45°27'S, 72°49'W), a Chilean lagoon on Aysen Fjord from June 1980 to December 1986. Of 38 copepod species encountered, the discovery of Centropages abdomina/is Sato, 1913 (17 females and 22 males), a calanoid copepod endemic to the North Pacific boreal-temperate waters, in November 1983 was reported as a new record for the South Pacific by Hirakawa (1986). Moreover, Acartia omorii Bradford, 1976 (9 females and 10 males) and Oithona davisae Ferrari and Orsi, 1984 (81 females), whose type localities are in the North Pacific, were found for the first time from this fjord during re-examination of the zooplankton sample in which C. abdominalis was found. Both species were absent in other samples from the area, while A. tonsa Dana, 1849 and O. simi/is Claus, 1866, which are regarded as congeneric native species of Chilean coastal waters from the previous records (Giesbrecht, 1889; 1891; Arcos, 1975; 1976), occurred seasonally during the study period. Although the geographical distribution of A. omorii, which was believed to be restricted to Japanese waters (Bradford, 1976; Ueda, 1986a; 1986b), is incompletely known, its occurrence from Chilean waters is undoubtedly a new record for the South Pacific. O. davisae was previously confused with another Indo-West Pacific estuarine rostrate oithonid, O. brevicornis Giesbrecht, 1891 338 BULLETIN OF MARINE SCIENCE, VOL. 42, NO.2, 1988 (Nishida et al., 1977), which was reported from the Pacific coast of South America by Wilson (1942). According to Nishida (1985), however, Wilson's records of O. brevicornis have not been verified by other workers and are considered question- able. Furthermore estuarine rostrate oithonids have not been reported from North or South America (Ferrari and Bowman, 1980, and sources cited therein). If this information is correct, the discovery of 0, davisae from this lagoon is a new record for the South Pacific along with C. abdominalis and A. omorii. These specimens of the three species have been deposited in the National Science Museum, Tokyo, Japan: C. abdominalis (NSMT-Cr 9355), A. omorii (NSMT-Cr 9356), and O. davisae (NSMT-Cr 9357). The disjunct distribution of A. omorii and O. davisae possibly can be attributed to introduction resulting from ballast water transport, as proposed for C. abdom- inalis (Hirakawa, 1986). Ferrari and Orsi (1984) consider the occurrence of O. davisae in California as indicating a synanthropic introduction, by ship ballast water, possibly from estuaries of the Asian continent. The port of Chacabuco located near Ensenada Baja can anchor freighters of I0 thousand tons displacement and has been used for shipments of lead concentrates and wool, and for local shipments of cattle (Wylie, 1983). Mr. K. Shimazu (an aquaculturist formerly with JICA) mentioned that a Japanese freighter had entered this port for shipment of tin ores in late February 1983 (pers. comm.). Although reports on the coastal and estuarine plankton distribution in western South America are scarce, I have independently come to the above-mentioned suggestion on the mechanism for introductions of these apparently isolated populations. ACKNOWLEDGMENTS I am very grateful to Dr. F. D. Ferrari, Smithsonian Institution for his helpful suggestion and critical reading of the draft of this manuscript. Thanks are expressed to the staffs of the JICA and the SERNAP, who assisted with the field work. LITERATURE CITED Arcos, R. D. 1975. Copepodos calanoideos de la Bahia de Concepcion, Chile. Conocimiento sis- tematico y variacion estacional. Gayana, Zool. 32: 1-31. --. 1976, Los copepodos calanoideos de la region magallanica. Expedicion Hero 72-4. Rev. Com. Perm. Pacifico Sur 5: 85-100. Bradford, J. M. 1976. Partial revision of the Acartia subgenus Acartiura (Copepoda: Calanoida: Acartiidae), N,Z. J. Mar. Freshwater Res. 10: 159-202. Ferrari, F. D. and T. E. Bowman. 1980. Pelagic copepods of the family Oithonidae (Cyclopoida) from the east coasts of Central and South America. Smithson. Contr. Zool. (312): 1-27. -- and J. Orsi. 1984. Oithona davisae, new species, and Limnoithona sinensis (BURCKHARDT, 1912) (Copepoda: Oithonidae) from the Sacramento-San Joaquin Estuary, California, J. Crus- tacean BioI. 4: 106-126. Giesbrecht, W. 1889. Elenco dei Copepodi pelagici raccolti dal tenente di vascello Gaetano Chierchia durante il viaggio della R. Corvetta "Vettor Pisani" negJi anni 1882-1885, edal tenente di vascello Francesco Orsini nel Mar Rosso, nel 1884. Atti Accad. Naz. Lincei Rc. Ser. 4 5: 24-29. --. 1891. Elenco dei Copepodi pelagici raccolti dal tenente di vascello Gaetano Chierchia durante il viaggio della R. Corvetta "Vettor Pisani" negJi anni 1882-1885, edal tenente di vascello Fran- cesco Orsini nel Mar Rosso, ne11884. Atti Accad. Naz. Lincei Rc. Ser. 4, 7: 474-481. Hirakawa, K. 1986. A new record of the planktonic cope pod Centropages abdominalis (Copepoda, Calanoida) from Patagonian waters, southern Chile. Crustaceana 51: 296-299. Nishida, S. 1985. Taxonomy and distribution of the family Oithonidae (Copepoda, Cyclopoida) in the Pacific and Indian Oceans. Bull. Ocean Res. Inst. Univ. Tokyo (20): 1-167. --, O. Tanaka and M. Omori. 1977. Cyclopoid copepods of the family Oithonidae in Suruga Bay and adjacent waters. Bull. Plankton Soc. Japan 24: 119-158. Ueda, H. 1986a. Redescription of the planktonic calanoid copepod Acartia hudsonica from Atlantic and Pacific waters: a new record from Japanese waters. J. Oceanogr. Soc. Japan 42: 124-133. NOTES 339 --. 1986b. Taxonomic reexamination and geographic distribution of copepods known as Acartia clausi in Japanese coastal and inlet waters. J. Oceanogr. Soc. Japan 42: 134-138 (in Japanese with English abstract). Wilson, C. B. 1942. The copepods of the plankton gathered during the last cruise of the Carnegie. Scient. Results Cruise VII Carnegie, BioI. I: i-v, 1-237. Wylie, F. V. H. 1983. South America ports handbook. Agencia Maritima lnternacional S.A., Buenos Aires. 658 pp. DATEACCEPTED: November 16,1987. ADDRESS: Marine Biological Research Institute of Japan. Co., Ltd., 4-3-16 Yutaka-cho, Shinagawa- ku, Tokyo 142, Japan..
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