scholarly journals Synoptic measurements of ingestion rate, ingestion selectivity, and absorption efficiency of natural foods in the deposit-feeding molluscs Nucula annulata (Bivalvia) and Hydrobia totteni (Gastropoda)

1983 ◽  
Vol 11 ◽  
pp. 55-62 ◽  
Author(s):  
GR Lopez ◽  
I-J Cheng
Keyword(s):  
Ingestion Rate ◽  
Absorption Efficiency ◽  
Natural Foods ◽  
Deposit Feeding

scholarly journals Feeding And Absorption in Cerastoderma Eduee Under Environmental Conditions in the Bay of Marennesoleron (Western France)

1996 ◽  
Vol 76 (2) ◽  
pp. 431-450 ◽  
Author(s):  
M.B. Urrutia ◽  
J.I.P. Iglesias ◽  
E. Navarro ◽  
J. Prou
Keyword(s):  
Organic Matter ◽  
Ingestion Rate ◽  
Organic Content ◽  
Absorption Efficiency ◽  
Carbon And Nitrogen ◽  
Physiological Processes ◽  
Tidal Cycles ◽  
Wide Range ◽  
Main Effect ◽  
Strong Dilution

Physiological processes involved in energy acquisition by the filter-feeding bivalve Cerastoderma edule (L.) (Mollusca: Bivalvia) were quantified under naturally fluctuating feeding conditions imposed by tidal cycles in the Bay of Marennes-Oleron. Physiological measurements were performed during two neap and two spring tidal cycles in order to cover a wide range of seston concentrations (TPM = 15–95 mg I-1). The main effect exerted by tides on the food supply was the resuspension of bottom sediments of low organic content, leading to a strong ‘dilution’ of suspended organic matter.Although filtration rate was found to increase with seston concentration, ingestion rate was strictly regulated by means of pseudofaeces production. Selection efficiencies for chlorophyll a (SEchl), overall organic matter (SE0), carbon (SEC) and nitrogen (SEN) were estimated and related to dietary descriptors. The following ranking was found for the efficiency with which different substrates were selected: SEchl>SEN>SEo>SEc. Absorption efficiency was found to depend on the organic content of ingested matter according to an exponential saturating function. Observed differences between carbon and nitrogen absorption efficiency were not statistically significant. Absorption rate was kept fairly constant through the wide range of seston concentrations and qualities.

Temporal changes of feeding and absorption of biochemical components in Cerastoderma edule fed an algal diet

2000 ◽  
Vol 80 (1) ◽  
pp. 119-125 ◽  
Author(s):  
I. Ibarrola ◽  
E. Navarro ◽  
J.I.P. Iglesias ◽  
M.B. Urrutia
Keyword(s):  
Organic Matter ◽  
Growth Phase ◽  
Biochemical Composition ◽  
Digestive Enzyme ◽  
Ingestion Rate ◽  
Absorption Efficiency ◽  
Exponential Growth Phase ◽  
Feeding Period ◽  
Cerastoderma Edule ◽  
Biochemical Components

Temporal evolution of the ingestion and absorption rates of organic matter and biochemical components in the filter-feeding bivalve Cerastoderma edule (Mollusca: Bivalvia) fed for 12 d on the same ration (1.5 mm3 l−1) of the microalgae Tetraselmis suecica (Chlorophyta: Prasinophiceae) having different biochemical composition, were measured. Cockles in group E were fed algal cells harvested at the exponential growth phase (55.5% of protein, 16.8% of carbohydrate and 27.6% of lipids) whereas cockles in group S were fed cells harvested at the stationary growth phase (45.3% of protein, 35.2% of carbohydrate and 20.0% of lipids). After the feeding period cockles were submitted to starvation and biochemical analysis of faeces produced during final steps of gut evacuation (after 24–96 h of starvation) was performed to estimate biochemical composition of metabolic faecal losses (endogenous matter lost during the process of digestion).Ingestion rate of organic matter was found to gradually increase during the feeding period in both groups. Absorption efficiency of organic matter decreased but reached an asymptotic minimum with rising ingestion rate. This relationship resulted in a gradual enhancement of absorption rate of organic matter over the time. Lipid fraction of food was found to be absorbed with significantly lower efficiency (even negative values were recorded in group S) than proteins and carbohydrates irrespective of the diet. Endogenous faecal losses presented high proportion of lipids (up to 66%) and lower proportions of proteins (∼25%) and carbohydrates (∼9%). On the other hand, increasing carbohydrate abundance in the diet brought about no apparent enhancement of carbohydrates absorption efficiency. Results are discussed in relation to the time-course of digestive enzyme activities.

scholarly journals Feeding behaviour of the mussel, Mytilus edulis: responses to variations in quantity and organic content of the seston

1993 ◽  
Vol 73 (4) ◽  
pp. 813-829 ◽  
Author(s):  
B. L. Bayne ◽  
J. I. P. Iglesias ◽  
A. J. S. Hawkins ◽  
E. Navarro ◽  
M. Heral ◽  
...  
Keyword(s):  
Food Environment ◽  
Feeding Behaviour ◽  
Ingestion Rate ◽  
Organic Content ◽  
Absorption Efficiency ◽  
Carbohydrate Component ◽  
Selection Efficiency ◽  
High Concentration ◽  
Physiological Adjustments ◽  
The Relationship

Mussels were fed four concentrations of seston (between 0·99 and 10·3 mg total seston I−1), comprising three levels of organic content (71·9, 63·6 and 40·8%), made up from natural silt and two species of cultured phytoplankton. Two of the seston concentrations were below, and two above, the threshold at which pseudofaeces were produced. Measurements of physiological traits (filtration rates, pseudofaeces production, selection efficiency, absorption efficiency, absorption rates and rates of oxygen consumption) were made after 2 days and, for two of the seston concentrations, also after 12 days. When fed at a high concentration of seston of low organic content, the mussels increased their filtration rate, rejected a higher proportion of filtered material as pseudofaeces, and increased the efficiency with which filtered matter of higher organic content was selected for ingestion; this resulted in a constancy of the relationship between ingestion rate and the concentration of particulate organic matter, regardless of differences in seston organic content. Between 2 and 12 d, the mussels increased absorption rates for organics, primarily by increasing absorption efficiency, both for total organics and for the carbohydrate component of the diet. We suggest that these responses to changes in the food environment comprise physiological adjustments which result in higher net rates of absorption than would be predicted from considerations only of the organic/inorganic ratio of the suspended particles and assumptions of a non-compensating feeding behaviour.

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