The interaction between Nereis diversicolor O.F. Müller and Corophium volutator Pallas as a structuring force in a shallow brackish sediment

Ólafsson, Einar B.; Persson, Lars-Eric

doi:10.1016/0022-0981(86)90135-8

Cited by 57 publications

(42 citation statements)

References 36 publications

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“…m-2 reported in the present work; cf. 3700 'large' N. diversicolor m-2 in the Vellerup Vig, Denmark (Rasmussen 1973); 2000 to 20000 m-2 (0.5 mm sieve) on the southwestern coast of Sweden (Olafsson & Persson 1986). It remains unknown to what extent N. diversicolor utilizes its potential to subsist on suspended food particles in nature.…”

Section: Discussionmentioning

confidence: 99%

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Suspension feeding in the polychaete Nereis diversicolor

Hu¹

1991

Mar. Ecol. Prog. Ser.

132

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ABSTRACT. Properties of the pump and filter system were studied in the occasionally suspensionfeeding polychaete Nereis diversicolor. Feeding behaviour was observed on worms in glass tubes immersed in seawater. When algal cells were added to the surrounding water the worm made a funnelshaped net-bag through which water was pumped by means of vigorously undulating movements of the body. Particles suspended In the inhalant water were retained by the net and later swallowed by the worm. The times spent on net-spinning, water-pumping through the complete net bag, and net-eating were: 97 t 35, 191 2 58, and 16 + 4 S, respectively. Stereotyped suspension-feeding behaviour was continuously recorded for 10 h by means of a computer-aided monitoring system. The volume of water cleared of algal cells (Rhodornonas baltica, diameter = 6.3 pm) per unit time (clearance) was measured in worms of different size. Clearance (C, p1 S-') as a function of body dry wt ( W , mg) was: C = 3.52 + 'C). The clearance of 6.3 pm algal cells was 86 % of directly measured pumping rate, while the clearance rates of 7.5 and 13.1 pm particles were identical with the directly measured pumping rate, thus indicating 100 % retention efficiency of particles >7.5 pm. For smaller particles the retention efficiency rapidly decreased to about 30 % for 3 pm particles. In order to characterize the Nereis pump the relation between imposed hydrostatic back pressure and pumping rate was measured in a number of worms. In several cases the pumping rate was not influenced by the imposed back pressure up to 3 mm H20; but at higher back pressures the pumping rate was reduced simultaneously with a reduction in the undulation frequency. The maximum pressure head was around 8 mm H20. It was found that N. diversjcolor pumps about 40 1 of water per m1 oxygen consumed, and the worm thus fulfills conditions for subsisting exclusively as a suspension feeder. The population pumping rate at the collecting site (2400 ind. m-2) was estimated to 9.8 m3 d-' or 10 times the whole water column daily. This indicates that N. diversicolor is a hitherto undervalued key organism in the control of phytoplankton production in shallow brackish water areas. W ( l ?

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Section: Discussionmentioning

confidence: 99%

“…As a predator N. diversicolor has been suggested to be a n important structuring factor in soft-bottom communities (Ronn et al 1988). Other studies do not, however, indicate that N. diversicolor is an efficient predator (Olafsson & Persson 1986).…”

Section: Introductionmentioning

confidence: 90%

Suspension feeding in the polychaete Nereis diversicolor

Hu¹

1991

Mar. Ecol. Prog. Ser.

132

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“…The Mactra-andDiastylopsis-dominated communities may represent natural patchiness, a common phenomenon in soft-sedimentcomm unities (Dayton 1984). Switching in dominance between 2 species can also result from direct interaction, involving, for example, predation (Ambrose 1984), or disturbance (Olafsson & Persson 1986). Such interaction may be occurring between M. ordinaria and D. crassior.…”

Section: Biotamentioning

confidence: 99%

Benthos associated with two New Zealand coastal outfalls

Roper¹,

Smith²,

Read³

1989

New Zealand Journal of Marine and Freshwater Research

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The benthic ecological impacts of 2 New Zealand ocean outfalls were studied. They are the country's largest (discharging 0.8 m 3 s -1) at Hastings, and longest-established (operating since 1965 and with a present discharge of 0.28 m 3 s -1 ) at Gisbome. Both discharge essentially biodegradable domestic and food-processing-industry wastes. Samples were collected about each outfall and analysed for particle size, oil and grease, readily oxidisable carbon (ROC), total Kjeldahl nitrogen (TKN), volatile solids, and macrofauna. Changes in the sediments indicated that the effluents contained inorganic paniculate material in the mud/very fine sand size range. Peaks in concentrations of oil and grease, ROC, TKN, and volatile solids occurred at the diffusers. Numbers of taxa were low near the outfalls, but increased with distance away. Numbers of individuals were also low at the outfalls, increasing within 100 m, before dropping to normal levels. No grossly polluted zone, devoid of macrofauna, was found; however, it appeared that a "polluted" zone occurred within 200 m of the diffusers and a "transitional" zone extended to between 800 and 1600 m from the Gisborne outfall, and 400 and 1600 m at Hastings. Multivariate classification and ordination indicated that over the area sampled, the discharges were the main factor shaping the patterns of community structure.

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“…In a previous paper ('Olafsson 1986), I demonstrated that 2 populations of Macoma balthica differ in their feeding modes between habitats. One population, in a sublittoral, sheltered, muddy-sand sediment, is primarily deposit-feeding while the other population, in a sublittoral, wave-exposed, sandy sediment, is primarily suspension-feeding.…”

Section: Introductionmentioning

confidence: 99%

Contrasting influences of suspension-feeding and deposit-feeding populations of Macoma balthica on infaunal recruitment

Olafsson¹

1989

Mar. Ecol. Prog. Ser.

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Effects of adult density of the bivalve Macorna balthica (L.) on growth and density in juvenile M. balthica (1 to 5wk) was tested experimentally in the field (exclusion cages) and in the laboratory. Growth of juveniles was reduced in the presence of adults at normal field density in a sublittoral, sheltered, muddy-sand sediment but was not reduced under similar conditions in a sublittoral, wave-exposed, sand sediment. Density of juveniles was not affected by adults in either habitat, or in the laboratory. Growth reduct~on In juveniles at normal clam densities in the muddy sand habitat (where adults and juveniles are deposit feeders) but not in the sand habitat (where adults are suspension feeders and juvemles deposit feeders) indicates that intraspecific competition between adults and juveniles increases with increasing levels of dietary resource overlap between them. Density and growth of other species, both juveniles and adults, were not affected by the normal density of adult M. balthica. Increased competition between species with greater resource overlap was further indicated by the negative effect on densities of deposit-feeding Hydrobia spp. caused by very high experimental densities of adult M. balthica (deposit-feeding) in the muddy sand habitat, whereas deposit-feeding oligochaetes in the sand habitat reached their highest densities at the highest density of adult M. balthica (suspension-feeding). The laboratory experiments showed that the presence of a nereid polychaete reduced survival of juvenile clams. The different influences of polychaete and adult clams on juveniles suggest that a different level of interaction occurs between the 2 groups, i.e. a direct impact (predation, disturbance, interference competition) of polychaetes and an indirect impact (exploitation competition) of bivalves on juveniles.

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The interaction between Nereis diversicolor O.F. Müller and Corophium volutator Pallas as a structuring force in a shallow brackish sediment

Cited by 57 publications

References 36 publications

Suspension feeding in the polychaete Nereis diversicolor

Suspension feeding in the polychaete Nereis diversicolor

Benthos associated with two New Zealand coastal outfalls

Contrasting influences of suspension-feeding and deposit-feeding populations of Macoma balthica on infaunal recruitment

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