Age composition in the population of Eisenia bicyclis (Laminariaceae; Phaeophyta).

Taniguchi, Koki; Kito, Hitoshi

doi:10.2331/suisan.54.1583

Cited by 18 publications

(17 citation statements)

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“…Marine algal zonation in the study area was almost the same as that described by Taniguchi 6 and Sano et al 8 (Fig. 1).…”

Section: Methodssupporting

confidence: 84%

“…Differences in the mean test diameter at specific ages among year classes in the crustose coralline area were attributed to their significantly larger growth in 1992. Taniguchi and Kito described that E. bicyclis germinated abundantly in the crustose coralline area to expand its area in the crustose corallines at an unusually low water temperature 49 . We observed something similar in 1992 in the present study; the water temperature in and around the study site was unusually low that year, and newly germinated E. bicyclis expanded its area to a depth of 12 m in the crustose corallines across the offshore boundary of the Eisenia area.…”

Section: Discussionsupporting

confidence: 76%

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Age distribution of the sea urchin Strongylocentrotus nudus (A. Agassiz) in relation to algal zonation in a rocky coastal area on Oshika Peninsula, northern Japan

et al. 2001

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The age distribution of the sea urchin Strongylocentrotus nudus in relation to algal zonation was studied in a sublittoral rocky area on Oshika Peninsula, northern Japan, from June 1995 through to August 1996. The algal zonation observed there extends from a shallow area of cobbles to deeper areas dominated successively by Sargassum yezoense, Eisenia bicyclis and, finally, crustose coralline red algae. One‐year‐old sea urchins occurred only on the cobbles and crustose corallines in contrast to the presence of 2‐year‐old individuals from all areas and the restricted distribution of individuals aged 3 years and over to Eisenia and crustose corallines. Calculated mean body sizes in the Eisenia area became larger after the age of 2 years compared with those in the area of crustose corallines. Spawning was ascertained histologically in both the Eisenia and crustose coralline areas, although gonad indices were higher in the former area than in the latter throughout the year. Gut contents were dominated by E. bicyclis in the Eisenia area, and by crustose coralline red algae and small algae in the crustose coralline area. Thus, the sea urchin may settle most abundantly on crustose corallines and lives there for 1–2 years. Thereafter, they expand their habitat toward the Eisenia area, where there is richer sources of food for attaining a higher growth rate and to generate heavier gonads.

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“…Marine algal zonation in the study area was almost the same as that described by Taniguchi 6 and Sano et al 8 (Fig. 1).…”

Section: Methodssupporting

confidence: 84%

Section: Discussionsupporting

confidence: 76%

Age distribution of the sea urchin Strongylocentrotus nudus (A. Agassiz) in relation to algal zonation in a rocky coastal area on Oshika Peninsula, northern Japan

et al. 2001

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“…Taniguchi and Kito (1988) reported that, in a year when the Kurile current was strong and cold, the developmental density of the juvenile sporophytes increased and, as a result, E. bicyclis beds expanded into deeper places. In northern Chile, during the 1997-1998 El Niño, the spatialtemporal patterns of abundance of the kelp assemblage were maintained by the continuity of coastal upwelling, which buffered and moderated superficial warming of the sea and depletion of nutrients.…”

Section: Sebensmentioning

confidence: 98%

Eisenia bicyclis bed coverage off Oshika Peninsula, Japan, in relation to sporophyte survival and Strongylocentrotus nudus abundance

Muraoka

2008

J Appl Phycol

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It has recently been reported that the Eisenia bicyclis beds on the coast of Tomarihama in the Oshika Peninsula in Miyagi Prefecture (northern part of Japan) have been progressively receding from the offshore side of the beds every year. In this study, to determine the factors causing the change in the distribution of E. bicyclis beds as well as the extent of the change, an ecological survey of E. bicyclis and grazing animals was conducted. A 150 m-long fixed line was set up in the rocky coastal area on the Oshika Peninsula in Miyagi Prefecture, and the number of E. bicyclis individuals inhabiting a 1-m width was then measured. In addition, the numbers of individuals of sea urchins (Strongylocentrotus nudus) and abalone (Haliotis discus hannai) were measured. Although the E. bicyclis bed extended to the 64-m point on the fixed line at the time of the survey in August 1999, by July 2001, its lower limit was at the 53-m point; thus, a retreat of the outer edge of the bed of 11 m was observed in 2 years. The density of adult E. bicyclis sporophytes in the bed was reduced from 1.08 to 1.80 individuals (ind.) m −2 , respectively. Juvenile sporophytes were also observed, but most of those that had settled near the lower limit of the bed failed to survive to become adult sporophytes. There were few sea urchins, the main grazing animal on the site, inside the E. bicyclis bed (3.5 ind. m −2 in October 2001) while there were many near the bed lower limit and on the deep-site side (12.9 ind. m −2 in October 2001). These results indicate that the high grazing pressure of sea urchins reduced the survival of juvenile sporophytes near the bed lower limit, thus impeding the recruitment of juvenile sporophytes to replace adult sporophytes that died due to senescence, storm action and/or grazing.

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“…The average daily intake of boiled‐salted stipe per adult was 6.2 g wet weight. The population of S. nudus on coralline flats is estimated to be about 100 000 individuals per ha 11 . We calculated that those sea urchins could eat 625 kg of boiled stipes every day.…”

Section: Discussionmentioning

confidence: 99%

Dietary effect of the boiled stipe of brown alga Undaria pinnatifida on the growth and gonadal enhancement of the sea urchin Strongylocentrotus nudus

2002

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In Miyagi Prefecture, the cultured brown alga Wakame (Undaria pinnatifida) is boiled and then salted for human consumption. The stipes are discarded. To explore a use for the discarded stipes, we studied their dietary value on the growth of the juvenile sea urchin Strongylocentrotus nudus and the gonadal enhancement of adults and compared them with that of fresh stipes, blades and sporophyll in the rearing experiment. Rapid growth in juveniles was most effectively promoted by the intake of fresh blades, with consumption of boiled stipes being next in value. The intake of boiled and salted stipe was higher than fresh stipe and sporophylls; however, sporophylls promoted the best gonadal enhancement in adults. Despite the low carbohydrate and crude protein content in boiled stipe, we estimated that boiled stipe could enhance the gonadal index by as much as 18%, the minimum level for market, after 5 months of feeding. The results suggest that boiled stipe would be an effective deterrent to the grazing intensity of the wild sea urchin within coralline flats where marine afforestation is being attempted.

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Age composition in the population of Eisenia bicyclis (Laminariaceae; Phaeophyta).

Cited by 18 publications

References 0 publications

Age distribution of the sea urchin Strongylocentrotus nudus (A. Agassiz) in relation to algal zonation in a rocky coastal area on Oshika Peninsula, northern Japan

Age distribution of the sea urchin Strongylocentrotus nudus (A. Agassiz) in relation to algal zonation in a rocky coastal area on Oshika Peninsula, northern Japan

Eisenia bicyclis bed coverage off Oshika Peninsula, Japan, in relation to sporophyte survival and Strongylocentrotus nudus abundance

Dietary effect of the boiled stipe of brown alga Undaria pinnatifida on the growth and gonadal enhancement of the sea urchin Strongylocentrotus nudus

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