Cephalopods from Deepwater Dumpsite 106 (Western Atlantic): vertical distribution and seasonal abundance

Lu, C. C, and Clyde F. E. Roper. Cephalopods from the Deepwater Dumpsite 106 (Western Atlantic): Vertical Distribution and Seasonal Abundance. Smithsonian Contributions to Zoology, number 288, 36 pages, 11 figures, 5 tables, 1979.—The vertical distribution, seasonal occurrence, relative abundance, spawning cycles, growth trends, and relationship to water types of 36 species of oceanic cephalopods are delineated from the Deepwater Dumpsite 106 (DWD 106) based on four seasonal cruises. The most commonly captured species were Pterygioteuthis gemmata, Abraliopsis pfefjeri, I Ilex illecebrosus, Histioteuthis reversa, and Mastigoteuthis magna. Information on probable spawning seasons was gained for the first time for /. illecebrosus, A. pfefjeri, P. gemmata, H. reversa, Megalocranchia megalops, and Alloposus mollis. Closing-net captures provided data on several species for which vertical distributions formerly were unknown: M. magna, Abralia redfieldi, A. veranyi, Ancistroteuthis lichtensteini, Histioteuthis elongata, Egea inermis. Mastigoteuthis magna is recorded for the first time since its original description in 1913. Several species occurred primarily in a particular water type. For example, H. reversa, A. pfefferi, and M. ?negalops occurred primarily in slope water, Chiroteuthis veranyi occurred only in (warm core) eddy water, while P. gemmata occurred about equally in both water types. Tests of co-occurrence of species between water types and cruises indicated that the species compositions were largely dissimilar. Only five species occurred on all four cruises: A. pfefferi, H. reversa, M. magna, T. pavo, and A. mollis, while five additional species occurred on any three of the four cruises. OFFICIAL PUBLICATION DATE is handstamped in a limited number of initial copies and is recorded in the Institution's annual report, Smithsonian Year. SERIES COVER DESIGN: The coral Montastrea cavernosa (Linnaeus). Library of Congress Cataloging in Publication Data Lu, C. C. Cephalopods from Deepwater Dumpsite 106 (western Atlantic) (Smithsonian contributions to zoology ; no. 288) Bibliography: p. Supt. of Docs, no.: SI 1.27:288 1. Cephalopoda—North Atlantic Ocean. 2. Vertical distribution (Aquatic biology)—North Atlantic Ocean. 3. Mollusks—North Atlantic Ocean. 4. Waste disposal in the oceanEnvironmental aspects—North Atlantic Ocean. I. Roper, Clyde F. E., 1937joint author. II. Title. III. Title: Deepwater Dumpsite 106 (western Atlantic) IV. Series: Smithsonian Institution. Smithsonian contributions to zoology ; no. 288. QL1.S54 no. 288 [QL430.2] 591' .08s [594' .5] 78-11352