Abstract The retention efficiency of 13 species suspension feeding bivalves has been determined by analysing the particle size distribution in inhalant and exhalant water currents using a Coulter electronic counter. were held aquaria under conditions very similar to their natural environment. It is shown that 11 species, Cardium echinatum, edule, Modiolus modiolus, Mytilus edulis, Musculus niger, Cultellus pellucidus, Arctica islandica, Ostera Hiatella striata, Mya arenaria Venerupis...

Particle retention efficiency in 6 species of suspension-feeding Northeast American bivalves was determined by simultaneous measurement clearance different sized particles.Geukensia dernissa, Spisula solidissirna, Brachidontes exustus, and Mercenaria rnercenana, which all possess large laterofrontal cirri, completely retained particles above 4 pm.Below this the gradually decreased to between 35 70 % for 2 kim particles.Crassostrea virginica, has small Argopecten irradians, none, entirely 5...

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 211:275-291 (2001) - doi:10.3354/meps211275 On measurement of filtration rates in bivalves — stony road reliable data: review and interpretation Hans Ulrik Riisgård* Research Centre for Aquatic Biology (Odense University), Hindsholmvej 11, 5300 Kerteminde, Denmark *E-mail: hur@biology.sdu.dk ABSTRACT: This...

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 418:255-293 (2010) - DOI: https://doi.org/10.3354/meps08755 REVIEW Particle capture mechanisms in suspension-feeding invertebrates Hans Ulrik Riisgård1,*, Poul S. Larsen2 1Marine Biological Research Centre (University of Southern Denmark), Hindsholmvej 11, 5300 Kerteminde, Denmark 2DTU Mechanical Engineering,...

Filter characteristics have been determined and compared in ciliary mucus-net filter feeders.The feeders include the polychaete Sabella penicillus, brachiopod Terebratulina retuso, marine bivalves Monia squama, Cardiurn glaucum, Petricola pholadiformis, freshwater Dreissena polymorpha, Unio pictamrn, Anodonta cygnea.The are Chaetopterus variopedatus, gastropod Crepidula fomicata, ascidians Sfyela clava, Ciona intestinalis, Ascidia virginia, obliqua, mentula.Efficiencies of particle retention...

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 141:37-45 (1996) - doi:10.3354/meps141037 Growth, filtration and respiration in mussel Mytilus edulis: no evidence for physiological regulation of filter-pump nutritional needs Clausen I, Riisgård HU The specific growth rate blue mussels edulis fed Rhodomonas sp. algal cells laboratory experiments increased...

Filtration rate (measured as clearance of algal cells) was measured at different temperatures in the sponge Halichondna panicea.An increase water temperature from 6 to 12 "C caused mean flltration 4.3 * 2.3 tlmes.Thls value higher than previously found for other marine ciliary suspension-feeding anlmals.Filtration also Haliclona urceolus by means a n indirect method In addition direct technique measuring pumping rate.It that 2 specles had near-identical rates, with maximum rates...

Under optimal conditions, bivalves tend to filter the ambient water at a maximum rate but under suboptimal environmental including low or very high algal concentrations, filtration is reduced. The upper concentration which blue mussel, Mytilus edulis , exploits its capacity over an extended period of time was identified by stepwise raising ( Rhodomonas salina ) in steady-state experiments above threshold for continuous rate. duration before incipient saturation reduction decreased with...

Filtration capacity of the ascidian Ciona intestinalis (L.) was measured in laboratory and determined from exponential reduction algal cell (Rhodomonas sp.) concentration as a function time.Filtration rate (F, m1 min-l) dry weight (W, g) found to be F= 118~:;$ F = 199~:;6:,, for total organs, respectively.Ascidians starved at least 12 h had, after addition cells, an initial lag-phase (1 2 h) with low filtration rates before constant high were attained.The duration longer concentrations.At...

Seasonal abundance and growth of the scyphomedusa Aurelia aunta were studied during 1991 1992 In Inner part a small shallow fiord, Kertinge Nor, Denmark Uunng both years, mass occurrence A was observed, maximum value ca 300 ind m-3 measured Apnl Growth poor in fiord mean umblella diameter medusae only 54 i 12 mm 37 + 15 respectively Growth, clearance, lngestlon resplratlon at different prey concentrations laboratory, an energy budget estabhshed Ephyrae (4 diameter] offered rotiferas...

Properties of the pump and filter system were studied in occasionally suspensionfeeding polychaete Nereis diversicolor.Feeding behaviour was observed on worms glass tubes immersed seawater.When algal cells added to surrounding water worm made a funnelshaped net-bag through which pumped by means vigorously undulating movements body.Particles suspended In inhalant retained net later swallowed worm.The times spent net-spinning, water-pumping complete bag, net-eating were: 97 t 35, 191 2 58, 16...

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 304:117-131 (2005) - doi:10.3354/meps304117 Clearance rates of jellyfish and their potential predation impact on zooplankton fish larvae in a neritic ecosystem (Limfjorden, Denmark) Lars Johan Hansson1,*, Ole Moeslund2, Thomas Kiørboe1, Hans Ulrik Riisgård2 1Danish Institute for Fisheries Research,...

The nature of the bivalve filter-pump was further elucidated in n~ussel Mytilus edulis by investigating effects temperature on pump and system characteristics.Pumping rates increased with temperature, linearly correlated temperature-determined decrease viscosity water.The variation pumping rate thus corresponded to varying viscous resistance water flow canal mussel-pump.The increase beat frequency lateral cilia therefore had no clear effect rate.Also, spawning stimulation without rates.In...

Properties of the blvalve pump were assessed by investigating, in mussel R4yhlus eduhs, effects on characteristics reduced valve gape, serotonin stlrnulation cihary activity, as well spawning.Reduced gaping caused a proportional dechne both flow rate at zero back pressure, V', and pressure flow, AH?, ( = AH",,, coefficient C I Z L,.Hq2N0 remaining constant.Enhanced beating lateral cilia, induced stimulation, did not affect or pressure.Excessive stimulation that eliminated laterofrontal clrri...

A filter feeding bivalve, represented by the mussel Mytilus edulis, is modelled as a pump, consisting of bands lateral cilia along gdl filaments, and system afferent efferent canals.The relation between pump pressure H p pumping rate V was approached through studies relations resistances V.The most important distinguished were frictional resistance m canal nHl, exit loss 'H,,, back l 2 , imposed on means to study performance characteristics gill system.Removal laterofrontal cini from flow...

Particle retention in Ascidiella aspersa, Molgula manhattensis, Clavelina lepadiformis and Ciona intestinalis was determined from comparisons of particle-size distributions the inhaled exhaled water.Particles down to 2-3 jun were completely retained efficiency smaller particles decreased about 70 "/o for 1 ~u n particles.There no indication that ascidians able adjust their efficiency.Filtration rates (F, m1 min-l) as a function total dry weight (W,,,,,, g) could be expressed F =...

Respiration rate ( R ) as a function of body mass W is usually expressed = aW b . Empirically, the value often close to 3/4 when organisms covering large span in are compared. But recent years research on energetic cost growth demonstrate that young and fast growing stages show higher weight specific respiration rates than older adult stages, this implies values tend be higher: ∼ 1 small (young) falling 0.6–0.7 larger (older) stages. Thus, integrated through costs growth. This explains why...

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 305:147-152 (2005) - doi:10.3354/meps305147 Effect of temperature on filtration rate in mussel Mytilus edulis: no evidence for compensation Christina Kittner*, Hans Ulrik Riisgård Biological Research Centre, University Southern Denmark, Hindsholmvej 11, 5300 Kerteminde, Denmark *Email: kittner@biology.sdu.dk...

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 128:239-246 (1995) - doi:10.3354/meps128239 Growth and energetics of sponge Halichondria panicea Thomassen S, Riisgård HU The filtration rate (F, ml min-1 measured as clearance algal cells) maintenance respiration (Rm, O2 h-1 starvation rate) a function colony size (dry weight DW, g) were described by: F =...

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 125:149-158 (1995) - doi:10.3354/meps125149 Feeding, growth and respiration in polychaetes Nereis diversicolor (facultative filter-feeder) N. virens (omnivorous)-a comparative study Nielsen AM, Eriksen NT, Iversen JJL, Riisgård HU The were fed various amounts of shrimp meat laboratory experiments linear...