Some relationships between growth, metabolism and food in the mussel Mytilus edulis

Thompson, R. J.; Bayne, B. L.

doi:10.1007/bf00394367

Cited by 226 publications

(105 citation statements)

References 20 publications

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“…Winter (1973) demonstrated that the different weight exponents were probably a result of the size range over which nitration rate was determined. In those studies that examined the relationship between filtration rate and body size over a size range of small individuals, the weight exponents were relatively high (b = 074: Winter, 1973;b = o-6o: Vahl, 1973), whereas the low weight exponent of 0-38 described in this paper is comparable to values found in other studies that included large animals in the size range (Willemsen, 1952;Theede, 1963;Winter, 1973;Thompson & Bayne, 1974).…”

Section: F = Food Concentration (Cells /Il~l)supporting

confidence: 81%

“…Smaller animals have a lower assimilation efficiency than larger individuals and the difference with respect to size increases with increasing cell concentration, becoming statistically significant at the high ration level. In an earlier study, Thompson & Bayne (1974) showed no significant effect of body size on assimilation efficiency at cell concentrations below 10000 cells ml"…”

Section: F = Food Concentration (Cells /Il~l)mentioning

confidence: 84%

“…The ration levels chosen were not equally spaced because the feeding and metabolic responses of Mytilus edulis have been shown (Thompson & Bayne, 1974) to be most sensitive to changes in food concentrations at the lower ration levels. More information was therefore required at food concentrations near the maintenance ration than at higher ration levels.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The regression coefficients were low and variable. Two factors could have contributed to this: (a) the size range extended over the upper size classes for the species (from o-i to 2-0 g), and it is in the larger animals that filtration rate appears to become more independent of body size (Winter, 1973;Thompson & Bayne, 1974); and (b) the natural individual variation in filtration rate. Therefore, a more detailed study of the relationship between filtration rate and weight was carried out at 15 0 MR.…”

Section: Filtration Ratementioning

confidence: 99%

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Combined Effects of Body Size, Food Concentration and Season on the Physiology of Mytilus Edulis

Widdows

1978

J. Mar. Biol. Ass.

229

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Multivariate experiments are used to study the effects of body size, food concentration, and season on the oxygen consumption, ammonia excretion, food assimilation efficiency and filtration rate of Mytilus edulis adults. Food concentrations and season affect both the intercept and the slope of the allometric equation describing oxygen uptake as a function of body size. Multiple regression and response surface techniques are used to describe and illustrate the complex relationship between metabolic rate, ration, season and the body size of M. edulis. Filtration rate has a relatively low weight exponent Q> = 038) and the intercept for the allometric equation is not significantly affected by food concentration, season or acclimation temperatures between 5 and 20 °C. Food assimilation efficiency declines exponentially with increasing food concentration and is dependent on body size at high food levels. The rate of ammonia excretion shows a similar seasonal cycle to that of oxygen consumption. They are both minimal in the autumn/winter and reach a maximum in the spring /summer. I N T R O D U C T I O NThe majority of studies of the physiological ecology of organisms have been concerned with changing a single environmental variable at a time, but more information on the relationships between biological responses and environmental factors would be provided by experimental techniques that emulate the multi-dimensional character of the natural environment.Experimental designs employing many variables simultaneously have several advantages over a single factor approach: (a) it is possible to obtain a broader understanding of the effects of each factor over the different conditions generated by variations in the other factors; (b) the wide range of factor combinations provides a more reliable basis for making predictions that will be valid in a variety of circumstances, and (c) it provides information on the extent of interactions between variables that are not independent of one another.In the present study, multivariate experiments have been used to investigate some physiological processes in Mytilus edulis L. The objectives were (a) to measure the adaptive responses of some physiological processes to combinations of levels of environmental factors; (b) to develop multiple regression equations and associated response surfaces that will describe the responses of Mytilus edulis to a wide range of environmental conditions, and (c) to demonstrate ways in which some physiological measurements may be used to quantify the degree of stress experienced under a variety of conditions ranging from near-optimal, through sub-lethal to lethal.In this, the first of two papers, multivariate experiments were used to study the effects

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Section: F = Food Concentration (Cells /Il~l)supporting

confidence: 81%

Section: F = Food Concentration (Cells /Il~l)mentioning

confidence: 84%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Filtration Ratementioning

confidence: 99%

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Combined Effects of Body Size, Food Concentration and Season on the Physiology of Mytilus Edulis

Widdows

1978

J. Mar. Biol. Ass.

229

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“…P. tricornutum: 52% at 2 x lo4 cells ml-l, Kiorboe et al 1980; Tetraselmis sp. : 60% at lo4 cells ml-l, Thompson and Bayne 1974; Alexandrium fundyense: 62%, Bricelj et al 1990). Our observation that mussels assimilated C from the chlorophytes (C. autotrophica and N. atomus) at a lower efficiency (8-2 1% GPT (h) Fig.…”

Section: Discussionmentioning

confidence: 97%

Assimilation of trace elements and carbon by the mussel Mytilus edulis: Effects of food composition

Wang¹,

Fisher²

1996

Limnology & Oceanography

233

190

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Assimilation efficiency (AE) is an important physiological parameter in determining trace element influx from food sources into aquatic animals. We used radiotracer techniques to examine the influence of diet [seven species of algae (two diatoms, two chlorophytes, a prasinophyte, and two dinoflagellates) and glass beads] on the assimilation of seven trace elements (Ag, Am, Cd, Co, Cr, Se, Zn) and C in the mussel Mytilus edulis. Trace element assimilation was related to C assimilation and cytoplasmic distribution in the algae and to gut passage time in the mussels. Mussels displayed different C AEs for the different algal diets; the chlorophytes, which had highly refractory cell walls, were the least digestible food. Assimilation of Cd, Se, and Zn was directly correlated with C assimilation; for Am, Ag, and Cr, no relationship with C assimilation was apparent. For each species except the chlorophytes, AEs of all elements significantly correlated with their cytoplasmic distribution within each algal cell. Among all species, AEs of Am, Co, and Se also increased with elemental penetration into the cytoplasm; however, this relationship was not statistically significant for Ag, Cd, or Zn. With the exception of Cr, AEs of elements increased with gut passage time, implying more efficient digestion-absorption when the element was retained longer in the digestive tract. In waters containing large mussel populations, unassimilated particle-reactive elements should be removed from suspension and enriched in biodeposits in sediments, whereas assimilated metals should be enriched in mussel tissues.For bivalve molluscs, both dissolved and particulate sources can contribute to metal accumulation in tissues. Uptake of metals from the dissolved phase occurs primarily across the gills, after which metals are transported into various organs. Accumulation of metals from particulate sources occurs by ingesting and assimilating metals from particulate sources. Metal influx from particles is a direct function of the assimilation efficiency (AE) of metals, the metal concentration in the ingested particles, and the ingestion activity of the animal (Thomann 198 1;Luoma et al. 1992). Assimilation represents a first-order physiological process that can be compared among different metals, food types, and environmental conditions, and AE can be used to measure metal bioavailability from specific foods.l Corresponding author.

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Bivalve Growth

2003

Bivalve Molluscs

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Some relationships between growth, metabolism and food in the mussel Mytilus edulis

Cited by 226 publications

References 20 publications

Combined Effects of Body Size, Food Concentration and Season on the Physiology of Mytilus Edulis

Combined Effects of Body Size, Food Concentration and Season on the Physiology of Mytilus Edulis

Assimilation of trace elements and carbon by the mussel Mytilus edulis: Effects of food composition

Bivalve Growth

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