Diel vertical migration and life strategies of two phytal-dwelling harpacticoids, Ambunguipes rufocincta and Eudactylops spectabilis

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概要

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• Seasonal occurrence, diel vertical migration (DVM), biomass (dry weight, carbon and nitrogen contents), growth and behavior of the two phytal-dwelling harpacticoid copepods, Ambunguipes rufocincta and Eudactylops spectabilis, were investigated using field samplings and laboratory experiments. The field samplings were conducted at a subtidal station (St. M; ca. 6.5 m depth) in Tanabe Bay, Japan from March 1999 to January 2000. The results from the field revealed that the two species performed DVM between the water column and macroalgal beds of Colpomenia sinuosa (brown algae), and the seasonal occurrence of the two species at St. M were almost identical to that of C. sinuosa, which bloomed only between December and May. The carbon/nitrogen ratios of A. rufocincta (5.00±0.60) and E. spectabilis (3.95±0.66) differed, probably due to the differences in their foods. Laboratory incubation showed that E. spectabilis needed both C. sinuosa and sediments as food for growth, whereas A. rufocincta that was fed only with the macroalgae was able to grow to maturity. Our results suggested that their DVM behaviors of both species were related to the dispersal of copepodids and adults, because 1) the nauplii grew on C. sinuosa, 2) their main food items were C. sinuosa and sediments, and 3) mating might not be the main purpose of the DVM since females with egg sacs emerged into the water column. Moreover, in later field investigations during summer, refuge populations of A. rufocincta were collected from the seagrass Halophila ovalis in an area shallower than St. M, indicating that A. rufocincta might sustain its population by moving to different habitats though the DVM behavior and changing food items from C. sinuosa to H. ovalis during summer. Therefore, at least for A. rufocincta, the DVM behavior might be indispensable in their life strategy for sustaining their population year round.

• 日本プランクトン学会、日本ベントス学会の論文
• 2006-02-01

著者

• SHIMODE SHINJI

  Graduate School of Environmental and Information Sciences, Yokohama National University

• Shimode Shinji

  Graduate School Of Environmental And Information Sciences Yokohama National University

• SHIRAYAMA Yoshihisa

  Seto Marine Biological Laboratory, Graduate School of Science, Kyoto University

• Shirayama Yoshihisa

  Seto Marine Biological Laboratory Graduate School Of Sciences Kyoto University

• Shirayama Yoshihisa

  Seto Marine Biological Laboratory Graduate School Of Science Kyoto University

• Shimode Senji

  Graduate School of Environmental and Information Sciences, Yokohama National University

関連論文

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• Reproductive ecology of dominant dinoflagellate, Ceratium furca, in the coastal area of Sagami Bay
• Seasonal Patterns of Vertical Distribution between Meiofaunal Groups in Relation to Phytodetritus Deposition in the Bathyal Sagami Bay, Central Japan
• Respiration Rates of Free-Living Marine Nematodes in the Subtidal Coarse-Sand Habitat of Otsuchi Bay, Northeastern Honshu, Japan
• Diel vertical migration and life strategies of two phytal-dwelling harpacticoids, Ambunguipes rufocincta and Eudactylops spectabilis
• Taxonomic Study of the Kinorhyncha in Japan. III. Echinoderes sensibilis n. sp. (Kinorhyncha: Cyclorhagida) from Tanabe Bay
• Echinoderes aureus n. sp. (Kinorhyncha : Cyclorhagida) from Tanabe Bay (Honshu Island), Japan, with a Key to the Genus Echinoderes
• Reproductive Ecology of Three Species of Interstitial Harpacticoid Copepod in Otsuchi Bay, Northeastern Japan
• Sub-Lethal Effects of Elevated Concentration of CO_2 on Planktonic Copepods and Sea Urchins
• EFFECTS OF INCREASED CO_2 CONCENTRATION IN THE SEA WATER ON THE EARLY DEVELOPMENT OF SEA URCHIN EMBRYOS(Behavior Biology and Ecology)(Proceedings of the Seventy-Third Annual Meeting of the Zoological Society of Japan)
• Use of Colloidal Iron as a Tracer to Measure the Ingestion Rates of Free-Living Marine Nematodes

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