Post-Settlement Processes Determining the Features of Bivalve Assemblages in Tidal Flats

Sekiguchi, Hideo; Uchida, Michitaka; Sakai, Akihisa

doi:10.5179/benthos1990.1995.49_1

Cited by 11 publications

(9 citation statements)

References 17 publications

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“…Our results for ammonium excretion rates by R. culista senhousia in our study area may be regarded as phiiippinarum, which are within the Same range as a typical feature of bivalve composition in intertidal those reported by Goulletquer et al (1989), suggest a and temperate coastal zones of Japan (Ohba 1959, negligible effect of this process in our experirnents. We Tanaka & Kikuchi 1978, Sekiguchi et al 1995). Both R. also infer that bacterial mineralization would have phiiippinarum and M. senhousia have recently gained been increasingly noticeable through the Course of the much attention worldwide.…”

Section: Diffusive Fluxes From the Sedimentsmentioning

confidence: 99%

Temporal scaling and relevance of bivalve nutrient excretion on a tidal flat of the Seto Inland Sea, Japan

Magni¹,

Montani²,

Takada³

et al. 2000

Mar. Ecol. Prog. Ser.

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Using an indirect and integrated approach, we quantified the magnitude and temporal variabiiity of the contribution of macrozoobenthos to the upward flux of inorganic nitrogen and phosphorus on a sandy tidal flat of the Seto inland Sea, Japan. From Apnl1994 to April 1996, we conducted monthly field surveys on the abundance and faunal composition of the macrozoobenthic communities inhabiting the lower part of the intertidal zone. Subsequently, we carried out 24 h day/night laboratory experiments on the nutrient excretion rate by various size-classes of the dominant species. We then obtained the animal nutrient excretion over a 2 yr period, muitiplying the species-specific excretion rates by the actual animal biomass found on the tidal flat. Additionaliy, for ali different seasons, we calcuiated the upward diffusive flux from the sediments from the vertical profiies of nutrient concentrations in the porewater. On the flat, the bivalves Ruditapes phihppinarum (Veneridae) and Musculista senhousia (Myhhdae) were dominant, making up 86 I 5.6 % when the total biomass exceeded 100 g DW (dry weight) m-'. From our laboratory experiments, the mean (day and night) nutrient excretion rates at 20 to 22OC by the 2 bivalve species were 18.9 p n o l NH4+-N g-' DW h-I, 4.8 pnol (NO3-+ NO2-)-N g-' DW h-' and 3.3 pmol P043--P g-' DW h-I. ln addition, NH4+-N excretion by R. phiiippinarum, but not that by M. senhousia, was significantly higher during the day than during the night. This occurred while the food (Thalassiosua sp.) offered in spikes was rapidly taken up irrespective of the concentration (within a field relevant spring-summer range of 10 to 60 pg T' chl a) andin day/night treatments. The release of nitrogen (N) and the release of phosphorus (P) were highly correlated with each other, for both R. philippinarum and M. senhousia, with a N/P ratio of 7.8 ? 3.0 and 9.9 * 3.5, respectively. In the field, the bivalve excretion rates of nutrients were calculated to be up to 35.2 mmol NH4+-N m-' d-I, 8.8 mrnol (NO3-+ NO2-)-N m-' d-' and 5.8 mmol P O~~--P m-' d-'. These values rank in the upper range of nutrient excretion by intertidal macrozoobenthos and are comparable to those found on dense assemblages (800 to 2000 g ash free DW m-') of the most investigated mussel, Mytzius eduiis. In addition, nutrient fluxes through bivalve excretion varied strongly within a few months, up to 10-fold (R. philippinarum) and 100-fold (M. senhousia) between April 1994 and August 1994, as related to the temporal change of bivalve standing stock. The extent of nutrient regeneration through diffusive flux was comparable to that reported for other intertidal zones of Japan and in the eutrophic Seto Inland Sea, within a range of 0.2 to 1.5 mmol NH4+-N m-' d-' and 0.01 to 0.05 mmol P043--P m-' d-I, thus more than 1 order of magnitude lower than that due to the excretory activity by R. phiiippinarum and M. senhousia. Our resuits indicate that the dominant bivalves, R. phihppinarum and M. senhousia, play a major role in the processes of benthic...

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Section: Diffusive Fluxes From the Sedimentsmentioning

confidence: 99%

Temporal scaling and relevance of bivalve nutrient excretion on a tidal flat of the Seto Inland Sea, Japan

Magni¹,

Montani²,

Takada³

et al. 2000

Mar. Ecol. Prog. Ser.

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“…[6][7][8][9][10][11] Similar studies on intertidal organisms indicate that their distribution and abundance, especially for barnacles, is determined mainly by post-settlement processes when the settlement rate is high, whereas it is determined by spa tial and temporal variations in settlement when the settle ment rate is low.9,12-16) Unfortunately, very few works have been done on larval recruitment processes in bivalve assem blages except Bachelet,17) and works by Sekiguchi and his colleagues. 4,[18][19][20] We have carried out a seven-year investigation (1990 to 1996) of larval recruitment processes in bivalve assem blages on tidal flats of Ano and Shitomo Rivers in Mie Prefecture along the Pacific coast of central Japan. Our previous studies done on the flats were based on samples collected from 1990 to 1993 and have been published in Sakai and Sekiguchi,41 Sekiguchi et al,") Tsutsumi and Sekiguchi.19,20) These studies mainly dealt with larval recruitment processes by which spatial distributions of three species (Ruditapes philippinarum, Musculista sen housia, Nuttallia olivacea) are maintained.…”

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confidence: 99%

Interannual Variation of Bivalve Populations on Temperate Tidal Flats

Miyawaki

Sekiguchi

1999

Fisheries science

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Studies were undertaken on long-term fluctuations of densities of different life stages (planktonic larvae, new settlers, and small and large bivalves) of three bivalve species (Ruditapes philippinarum, Musculista senhousia, Nuttallia olivacea) common on tidal flats, based on samples collected for 7 years from 1990 to 1996 in the Shitomo and Ano Rivers along the west coast of Ise Bay, central Japan. Seasonal and interannual variations in densities of different life stages for the three species were remark able. In general, seasonal variations in densities of planktonic larvae corresponded to those of the benthic populations for each species, while interannual variations in densities of the larvae did not correspond to those of the benthic populations. However, 'great' peaks of densities of the larvae sometimes contributed to establish the benthic populations of each species.

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“…We defined ‘recruitment’ as individuals with a shell length of 1.0 mm or more (i.e. attaining large bivalves) following Sekiguchi et al , 16 Tsutsumi and Sekiguchi, 17,18 and Miyawaki and Sekiguchi 4,5 …”

Section: Methodsmentioning

confidence: 99%

“…Only a few studies have been done on larval recruitment of bivalves due to difficulties in quantitative sampling and the identification of planktonic larvae. Based on Sakai and Sekiguchi's 15 identification key for planktonic larvae and new settlers of bivalves commonly and abundantly found on Japanese tidal flats, Sekiguchi and his colleagues have studied the larval recruitment of R. philippinarum , Musculista senhousia and Nuttallia olivacea on tidal flats along the western coast of Ise Bay on the Pacific coast of central Japan 4,5,16–18 . The results of their studies are summarized as follows: Seasonal and annual fluctuations of densities of planktonic larvae, new settlers and small to large bivalves in these three species are remarkable, and the larvae released by fall–early winter spawners may contribute mainly to the establishment of benthic populations.…”

Section: Introductionmentioning

confidence: 99%

Larval recruitment of the manila clam Ruditapes philippinarum in Ariake Sound, southern Japan

Ishii

Sekiguchi

Nakahara³

et al. 2001

Fisheries Sci

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The mechanisms by which catch yields of the manila clam Ruditapes philippinarum have decreased drastically in Kumamoto Prefecture, southern Japan, and the larval recruitment by which benthic populations of the clam are maintained were studied. Samples at different growth stages (planktonic larvae, new settlers, and small to large bivalves of the species) were collected from February 1997 to December 1998 on two tidal flats (Kawaguchi and Nameishi, 20 km distance from each other) along the eastern coast of Ariake Sound. Densities of planktonic larvae, new settlers and small bivalves were generally higher at Kawaguchi than Nameishi. The higher density of large bivalves at Kawaguchi depends on a high larval density. Larval retention mechanisms coupled with water movement at Kawaguchi, such as tidal residual currents, may be related intimately with the higher larval density at Kawaguchi. Predation by shore birds at and after recruitment may be related to the lower density of large bivalves recorded at Kawaguchi in 1998, despite larval densities being higher there.

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Post-Settlement Processes Determining the Features of Bivalve Assemblages in Tidal Flats

Cited by 11 publications

References 17 publications

Temporal scaling and relevance of bivalve nutrient excretion on a tidal flat of the Seto Inland Sea, Japan

Temporal scaling and relevance of bivalve nutrient excretion on a tidal flat of the Seto Inland Sea, Japan

Interannual Variation of Bivalve Populations on Temperate Tidal Flats

Larval recruitment of the manila clam Ruditapes philippinarum in Ariake Sound, southern Japan

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