Influence of current speed on clearance rate, algal cell depletion in the water column and resuspension of biodeposits of cockles (Cerastoderma edule)

2007 ◽  
Vol 343 (1) ◽  
pp. 44-51 ◽  
Author(s):  
J. Widdows ◽  
J.M. Navarro
Keyword(s):  
Water Column ◽  
Clearance Rate ◽  
Algal Cell ◽  
Current Speed ◽  
Cell Depletion ◽  
Cerastoderma Edule

Seasonal Variation in Physiological Energetics of Mytilus Edulis and Cerastoderma Edule of Different Size Classes

1997 ◽  
Vol 77 (3) ◽  
pp. 817-838 ◽  
Author(s):  
A.C. Smaal ◽  
A.P.M.A. Vonck ◽  
M. Bakker
Keyword(s):  
Body Weight ◽  
Seasonal Variation ◽  
Mytilus Edulis ◽  
Clearance Rate ◽  
Sea Water ◽  
Stepwise Multiple Regression ◽  
Reproductive Condition ◽  
Cerastoderma Edule ◽  
Size Classes ◽  
Respiration Rates

Seasonal variation of clearance, absorption and respiration rates of mussels Mytilus edulis (Mollusca: Bivalvia) and cockles Cerastoderma edule (Mollusca: Bivalvia) of various size classes have been measured under ambient temperature and sea-water conditions. Food availability was kept almost constant during the measurements.Allometric body weight coefficients were bcl=0.5 for clearance and about br=0.7 for respiration rate of both species. Stepwise multiple regression suggested no relation for clearance rate of mussels with temperature and reproductive condition throughout the year. Respiration rates of mussels were highest during the reproductive period. Excretion rate was measured for mussels only and showed an allometric coefficient of bex=0.7 and an increase with temperature in spring. For cockles a significant relation of clearance rate, body weight and temperature was observed; at low temperature, clearance rates of small animals were more reduced than for larger animals. Respiration rates of cockles showed a significant relationship with temperature and reproductive condition.

Ingestion of mesozooplankton by three species of bivalve; Mytilus edulis, Cerastoderma edule and Aequipecten opercularis

2002 ◽  
Vol 82 (4) ◽  
pp. 615-619 ◽  
Author(s):  
Clare Lehane ◽  
John Davenport
Keyword(s):  
Water Column ◽  
Mytilus Edulis ◽  
Natural Habitat ◽  
Present Condition ◽  
Zooplankton Species ◽  
Cerastoderma Edule ◽  
Wide Range ◽  
Aequipecten Opercularis

Mytilus edulis, Cerastoderma edule and Aequipecten opercularis were found to ingest zooplankton when suspended in mesh cages in the water column in the Firth of Clyde. Zooplankters were also found in the stomachs of bivalves that had been taken directly from their natural habitat. The bivalves consumed a wide range of zooplankton species, but selectively consumed smaller categories of zooplankton present. Condition of zooplankton in the stomachs of the bivalves varied with zooplankton species. A degree of larviphagy was evident, particularly in Mytilus edulis.

Impact of zebra mussel (Dreissena polymorpha) on phosphorus cycling and chlorophyll in lakes

1995 ◽  
Vol 52 (12) ◽  
pp. 2553-2573 ◽  
Author(s):  
Eric Mellina ◽  
Joseph B. Rasmussen ◽  
Edward L. Mills
Keyword(s):  
Water Column ◽  
Chlorophyll A ◽  
Zebra Mussel ◽  
Dreissena Polymorpha ◽  
Size Structure ◽  
Algal Cell ◽  
Algal Community ◽  
Community Size ◽  
Western Basin ◽  
Excretion Rates

We determined the effects of zebra mussel (Dreissena polymorpha) on water column phosphorus (P) and chlorophyll a levels and algal community size structure as well as rates of P excretion in laboratory experiments. Zebra mussel at a threshold density of 0.25/L were able to decouple the nutrient–chlorophyll relationship, to induce erratic patterns in P and chlorophyll a trends, and to decrease mean algal cell sizes. Using shell length we explained 75 and 71% of the variability in P excretion rates in trials held at 17 and 22 °C. Using mass balance modeling, we examined the effects of zebra mussel growth and mortality on mean annual steady-state P levels as functions of hydraulic flushing and P loadings for the western basin of Lake Erie, for Lake St. Clair, and for Oneida Lake. Zebra mussel affected water column P levels only when the annual P accumulated into mussel biomass represented >20% of the lake's annual P loading. The mussel populations in all three lakes did not substantially affect water column P levels but decoupling of the nutrient–chlorophyll relationship was observed in lakes Erie and St. Clair. No evidence was found for increased decoupling of this relationship with increasing zebra mussel density in European lakes.

scholarly journals KINETIC STUDY OF PHOSPHOR DAN NITROGEN COMPOUNDS FROM SEDIMENTARY RE-SUSPENSION

2009 ◽  
Vol 1 (1) ◽  
Author(s):  
T. Prartono ◽  
T. Hasena ◽  
T. Hasena ◽  
T. Hasena
Keyword(s):  
Kinetic Study ◽  
Water Column ◽  
Nutrient Availability ◽  
Laboratory Study ◽  
Current Speed ◽  
Nitrogen Compounds ◽  
Water Mixture ◽  
Sediment Composition ◽  
Average Contribution ◽  
Several Intervals

<p>Kinetic study of phosphor and nitrogen compounds through resuspension sediment has been carried out to determine their time release from sediment to the water column. This laboratory study was performed by stirring the sediment within the seawater at an equal current speed of 1 m/sec. Nutrients were observed at several intervals of 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes and 40 minutes by sampling 25 ml water mixture with 3 time as replicates. The increase of nutrient occurred significantly during 5 minutes. Their average contribution of nutrient per gram sediment reached 1.827 μg phosphate, 0.292 mg ammonia, 0.276 mg ammonium, 1.776 μg nitrite and 9.059 μg nitrate. The extent of nutrient increase was probably depended upon characteristic of sediment (composition of nutrient availability) and resuspension speed.</p><p>Keywords: kinetic, nutrient, resuspension, sediment, Jakarta Bay.</p>

scholarly journals KINETIC STUDY OF PHOSPHOR DAN NITROGEN COMPOUNDS FROM SEDIMENTARY RE-SUSPENSION

2009 ◽  
Vol 1 (1) ◽  
Author(s):  
T. Prartono ◽  
T. Hasena ◽  
T. Hasena ◽  
T. Hasena
Keyword(s):  
Kinetic Study ◽  
Water Column ◽  
Nutrient Availability ◽  
Laboratory Study ◽  
Current Speed ◽  
Nitrogen Compounds ◽  
Water Mixture ◽  
Sediment Composition ◽  
Average Contribution ◽  
Several Intervals

Kinetic study of phosphor and nitrogen compounds through resuspension sediment has been carried out to determine their time release from sediment to the water column. This laboratory study was performed by stirring the sediment within the seawater at an equal current speed of 1 m/sec. Nutrients were observed at several intervals of 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes and 40 minutes by sampling 25 ml water mixture with 3 time as replicates. The increase of nutrient occurred significantly during 5 minutes. Their average contribution of nutrient per gram sediment reached 1.827 μg phosphate, 0.292 mg ammonia, 0.276 mg ammonium, 1.776 μg nitrite and 9.059 μg nitrate. The extent of nutrient increase was probably depended upon characteristic of sediment (composition of nutrient availability) and resuspension speed.Keywords: kinetic, nutrient, resuspension, sediment, Jakarta Bay.

Effect of the presence of the shore crab, Carcinus maenas, on burrowing behaviour and clearance rate of the common cockle, Cerastoderma edule

2011 ◽  
Vol 158 (12) ◽  
pp. 2685-2694 ◽  
Author(s):  
C. Romano ◽  
G. Sarà ◽  
G. Salvo ◽  
J. Bishop ◽  
A. Mazzola ◽  
...  
Keyword(s):  
Clearance Rate ◽  
Carcinus Maenas ◽  
Shore Crab ◽  
Cerastoderma Edule ◽  
The Common ◽  
Burrowing Behaviour ◽  
Common Cockle

scholarly journals In situ oxygen dynamics in rhizomes of the seagrass Posidonia sinuosa: impact of light, water column oxygen, current speed and wave velocity

2018 ◽  
Vol 590 ◽  
pp. 67-77 ◽  
Author(s):  
YS Olsen ◽  
MW Fraser ◽  
BC Martin ◽  
A Pomeroy ◽  
R Lowe ◽  
...  
Keyword(s):  
Water Column ◽  
Wave Velocity ◽  
Current Speed ◽  
Light Water ◽  
Oxygen Dynamics

scholarly journals Assessment of carbamazepine acute toxicity in the cockle Cerastoderma edule through chemical, physiological and biochemical tools

2022 ◽  
Vol 82 ◽  
Author(s):  
R. Jaouani ◽  
M. Dellali ◽  
C. Mouneyrac ◽  
S. Ben Hassine ◽  
M. Ben Ali ◽  
...  
Keyword(s):  
Superoxide Dismutase ◽  
Acute Toxicity ◽  
Food Web ◽  
Clearance Rate ◽  
Exposure Period ◽  
Acetylcholinesterase Activity ◽  
Cellular Damage ◽  
Cerastoderma Edule ◽  
Biotransformation Enzyme ◽  
Physiological And Biochemical

Abstract The cockle Cerastoderma edule was exposed to four concentrations (5, 10, 20 and 70 μg L-1) of carbamazepine (CBZ). This anticonvulsant was found to alter the mussel behavior of by reducing its clearance rate (CR). Analysis of CBZ accumulation in tissues of C. edule was carried out using HPLC-UV after 48 or 96 hours of exposure. In addition, an overproduction of H2O2 by the bivalves was detected following exposure to CBZ but nitrite levels remained unchanged. Moreover, superoxide dismutase and catalase activities showed a significant increase in relation to their contact with CBZ. The activity of the biotransformation enzyme gluthatione-S-transferase did not change during exposure. Malondialdehyde (MDA) levels indicating cellular damage, increased when bivalves were exposed to 20 and 70 μg l-1 of carbamazepine for 96 h CBZ. The results also indicate that acetylcholinesterase activity (AChE) was inhibited in all CBZ concentrations during the 48 h exposure period. However, during the 96 h exposure period, AChE was only inhibited at the highest concentration. Further studies are needed now for more exploration of the toxicity of CBZ since it could be bioaccumulable throughout the food web and may affect non-target organisms.

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