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Marine Biology

, Volume 154, Issue 6, pp 985–995 | Cite as

Offshore–inshore and vertical distributional patterns of heteropod mollusks off leeward Oahu, Hawaii

  • Roger R. SeapyEmail author
Original Paper

Abstract

Replicated zooplankton tows were taken during day and night periods at neritic (1 nmi offshore) and oceanic (5 and 15 nmi offshore) stations off the leeward side of Oahu, Hawaii during fall (September) and spring (April). Plankton samples were obtained with a 1-m2 MOCNESS net system towed obliquely through seven depth strata to 80 m (neritic station) and eight depth strata to 200 m (oceanic stations). Five more species were collected in April (17) than in September (12). During both months the number of species decreased from the 15 to the 1 nmi stations; from 11 to 9 in September and 15 to 11 in April. Species diversity, as measured by species accumulation (rarefaction) curves, was higher at the 15 than the 1 nmi stations during both months. Total nighttime water column density in April was about double that in September. In September, the density decreased sevenfold from the 15 to 1 nmi stations, but in April densities were comparable among the three stations; mainly as a result of the shoreward increase in density of Atlanta plana. The most abundant species in both months were A. plana, A. lesueuri, A. inflata, A. peroni, and Protatlanta souleyeti, which in combination accounted for 93% (September) and 91% (April) of the total nighttime water column densities. The vertical ranges of six species were limited to the upper 100 m, and nocturnal migration was suggested for two (A. helicinoides during both months and A. turriculata in April). The ranges of the remaining 11 species extended to 160 or 200 m, and among them nocturnal migration was suggested for five (A. plana, A. meteori and Pterotrachea hippocampus during both months, and A. peroni and Protatlanta soueleyti in April).

Keywords

Depth Interval Shelf Water Vertical Range Night Period Offshore Station 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

I am most grateful to George Boehlert, former director of the Honolulu NMFS Laboratory, for enabling and facilitating my examination of MOCNESS and Manta net samples. He graciously provided laboratory space and use of a dissection microscope during my series of visits to the NMFS facility. The assistance of Bruce Mundy, the field and laboratory project coordinator, is most gratefully acknowledged. He assembled the zooplankton samples for my examination during each visit, set aside sufficient space in his lab for my needs, and provided photocopies of relevant data sheets and plots of water column physical properties. Lastly, I thank Sean Walker for his insights on assessment of species diversity and for assistance in carrying out the rarefaction analyses.

References

  1. Boehlert GW, Mundy BC (1994) Vertical and onshore–offshore distributional patterns of tuna larvae in relation to physical habitat features. Mar Ecol Prog Ser 107:1–13CrossRefGoogle Scholar
  2. Boehlert GW, Mundy BC (1996) Ichthyoplankton vertical distributions near Oahu, Hawai’i, 1985–1986: data report. NOAA-NMFS Tech Memo, NOAA-TM- NMFS- SWFSC-235Google Scholar
  3. Brown DM, Cheng L (1981) New net for sampling the ocean surface. Mar Ecol Prog Ser 5:225–227CrossRefGoogle Scholar
  4. Buddle CM, Beguin J, Bolduc E, Mercado A, Sackett TE, Selby RD, Varady-Szabo H, Zeran RM (2005) The importance and use of taxon sampling curves for comparative biodiversity research with forest arthropod assemblages. Can Entomol 137:120–127CrossRefGoogle Scholar
  5. Frontier S (1966) Zooplancton de la région de Nosy-Bé. I. Programme des Récoltes et techniques d’études. II. Plancton de surface aux stations 5 et 10. Cah ORSTOM, sér Océanogr 4:3–36Google Scholar
  6. Frontier S (1973a) Zooplancton de la région de Nosy-Bé. VI. Ptéropodes, Hétéropodes—Première partie: espèces holonéritiques et néritiques-internes. Cah ORSTOM, sér Océanogr 11:273–289Google Scholar
  7. Frontier S (1973b) Zooplancton de la région de Nosy-Bé. VII. Ptéropodes, Hétéropodes—Deuxiéme partie: espèces néritiques-externes et océaniques tolérantes. Cah ORSTOM, sér Océanogr 11:291–302Google Scholar
  8. Gotelli NJ, Entsminger GL (2001) EcoSim: Null models software for ecology. Version 7.0. Acquired Intelligence Inc. & Kesey-Bear. http://homepages.together.net/~gentsmin/ecosim.htm
  9. Grice GD, Hart AD (1962) The abundance, seasonal occurrence and distribution of the epizooplankton between New York and Bermuda. Ecol Monogr 32:287–307CrossRefGoogle Scholar
  10. Michel HB, Michel JF (1991) Heteropod and thecosome (Mollusca: Gastropoda) macroplankton in the Florida Straits. Bull Mar Sci 49:562–574Google Scholar
  11. Pafort-van Iersel T (1983) Distribution and variation of Carinariidae and Pterotracheidae (Heteropoda, Gastropoda) of the Amsterdam Mid North Atlantic Plankton Expedition 1980. Beaufortia 33:73–96Google Scholar
  12. Richter G (1982) Mageninhaltsuntersuchungen an Oxygyrus keraudreni (Lesueur) (Atlantidae, Heteropoda). Beispiel einer Nahrungskette im tropischen Pelagial. Senckenbergiana marit 14:47–77Google Scholar
  13. Richter G, Seapy RR (1999) Heteropoda. In: Boltovskoy D (ed) South Atlantic Zooplankton. Backhuys, Leiden, pp 621–647Google Scholar
  14. Seapy RR (1990a) Patterns of vertical distribution in epipelagic heteropod mollusks off Hawaii. Mar Ecol Prog Ser 60:235–246CrossRefGoogle Scholar
  15. Seapy RR (1990b) The pelagic family Atlantidae (Gastropoda: Heteropoda) from Hawaiian waters: a faunisitic survey. Malacologia 32:107–130Google Scholar
  16. Tesch JJ (1949) Heteropoda. Dana Rep 34:1–53Google Scholar
  17. Wiebe PH, Morton AW, Bradley AM, Backus RH, Craddock JE, Barber V, Cowles TJ, Flierl GR (1985) New developments in MOCNESS, an apparatus for sampling zooplankton and micronekton. Mar Biol 87:313–323CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  1. 1.Department of Biological ScienceCalifornia State UniversityFullertonUSA

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