Production of Mussels, <i>Mytilus Edulis</i>, in Suspended Culture and Estimates of Carbon and Nitrogen Flow: Killary Harbour, Ireland

Rodhouse, P. G.; Roden, C. M.; Hensey, M. P.; Ryan, T. H.

doi:10.1017/s0025315400060793

Cited by 38 publications

(16 citation statements)

References 19 publications

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“…Bayne (1984) estimated fecundity (loss of gametes) of mussels of various size classes from different areas, observing considerable variation in fecundity, with a maximum loss of 20 % body weight to spawning for mussels of 1 g DFW. A similar fecundity figure was reported by Rodhouse et al (1985). Pieters et al (1980), however, observed much larger weight changes of mussels during spawning; up to 50% in Wadden Sea mussels in April.…”

Section: Discussionsupporting

confidence: 87%

Seasonal variation in C, N and P budgets and tissue composition of the mussel Mytilus edulis

Smaal¹,

Vonk²

1997

Mar. Ecol. Prog. Ser.

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Net C , N and P budgets of mussels were measured monthly in a field laboratory for a year. The calculated scope for growth was compared with the observed growth rates per month, for each element. Assuming ambient food, scope for growth was calculated and compared with changes in the tissue composition of mussels from a n estuarine field population. When total organic material was used as food, the calculated scope for growth overestimated the actual growth rates throughout the year. When phytoplankton was considered to be the main food source, the scope for growth provided by each element compared well with observed changes in tissue content, except during the spawning period. Durlng spawning, the difference between growth and scope for growth indicated a considerable loss of C, N and P. These losses exceeded estimated loss through gametes, indicating additional loss, ascnbed to tissue damage. Good correspondence was found between the predicted and observed C:N:P stoichiometry of mussels. Compared with phytoplankton, mussels contained relatively more N The absorption efficiencies of C, N and P were not significantly different, but in most cases the excretion ratios of C:N and N:P showed that N accumulated more than C and P. Average annual net growth efficiency was higher for P than for C and N. Elemental residence time in tissue, however, was highest for N. It is concluded that mussels are able to use N more efficiently than C and P, because they retain it better.

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Section: Discussionsupporting

confidence: 87%

Seasonal variation in C, N and P budgets and tissue composition of the mussel Mytilus edulis

Smaal¹,

Vonk²

1997

Mar. Ecol. Prog. Ser.

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“…Nutrient budgets have been published for two marine inlets in Ireland, Killary Harbour (Rodhouse et al, 1985, Rodhouse and Roden, 1987, Roden et al, 1987 and Lough Hyne (Johnson et al, 1995). The first major study of water quality in Wexford Harbour was carried out in 1980 in connection with the proposed main drainage scheme for Wexford Town (An Foras Forbatha, 1980).…”

Section: Introductionmentioning

confidence: 99%

“…Surveys were then conducted on behalf of Wexford County Council in 1982, 1984and 1986(Regional Water Laboratory, 1982, 1986, An Foras Forbatha, 1984. The water quality in the estuary has deteriorated since 1993 and the leve1 of nitrate in the River Slaney has doubled between 1985and 1996(Neill, 1997. In 1996, a coastal bloom of the planktonic alga Phaeocystis sp.…”

Section: Introductionmentioning

confidence: 99%

Modelling nutrient and chlorophyll_a dynamics in an Irish brackish waterbody

Hartnett

2004

Environmental Modelling & Software

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This paper presents aspects of a research investigation into nutrient fluxes into and out of an important Irish estuary, Wexford Harbour, located in the southeast of Ireland. Details of the methodology applied, the data collection and analysis and the models used are outlined. In particular, the paper addresses modelling of chlorophyll_a production in the brackish waterbody and its dependency on light attenuation.There are three distinct stages to the research carried out: (i) collection, collation and analysis of physical, chemical and biological water quality variables; (ii) development, validation and application of a chlorophyll_a production model; (iii) development of a Geographic Information System.The nutrient and chlorophyll_a production model simulates nine interactive water quality parameters; during the first stage above these parameters were measured to provide initial conditions for the model and for calibration purposes. From measurements, relationships were derived between the water quality variables and salinity, which were used to specify initial spatially varied values of the parameters to the model at different seasons. A relationship was also developed between light intensity, turbidity and concentrations of chlorophyll_a, based on field measurements. This relationship was incorporated into the model. The paper presents chlorophyll_a predictions using this relationship and illustrates how the enhanced model can be used as an accurate modelling tool for managing coastal ecosystems. The water quality model was incorporated into the ArcView GIS system providing an easy-to-use graphical user interface to run simulations and interrogate results.

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“…Although the primary purpose of these techniques is to avoid predators (Mason 1976), as mussel growers manipulate space, they also manipulate food by raising the mussels in the water column above the food-depleted zone that would develop if mussels were grown on the bottom. The analogy between food and space no longer holds, however, when one considers that not only bottom populations, but also mussels grown in the water column can deplete phytoplankton when stocking density is sufficiently high (Cabanas et al 1979, Rodhouse et al 1985. Space and food are also manipulated independently when high current speed areas are sought in order to enhance the food supply (Frechette et al 1989, Grizzle & Lutz 1989 for bottomcultured animals.…”

Section: Introductionmentioning

confidence: 99%

Discriminating between food and space imitation in benthic suspension feeders using self-thinning relationships

Fréchette¹,

Lefaivre²

1990

Mar. Ecol. Prog. Ser.

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Growth and survival have been shown to be density-dependent in many populations of benthic suspension feeders, but it is generally difficult to determine whether food or space is the limiting factor. The study of biomass-density relationships (B-N diagram) in self-thinning situations may provide an additional criterion for such a purpose. It is shown here that the slope of B-N diagrams may vary significantly depending on whether food or space is the Limiting factor When food is Limiting, it varies as a function of the exponent relating respiration to individual biomass. When space is limiting, the slope varies as a function of the length-weight relationship, roughness of the substrate at scales significant to the organisms, and the relationship between individual size and maximum population density. Testing the slopes of B-N relationships may, therefore, provide evidence concerning the nature of the limiting factor. Further, when food is the Limiting factor, the intercept of B-N diagrams is an index of site quality. An example of the use of the B-N diagram for purposes of managing bivalve aquaculture is provided for mussels cultivated on bouchots (intertidal stakes). It is shown that in this particular case, space and food probably alternated seasonally as limiting factors. In addition, under the hypothesis that the entire population is completely harvested on a single occasion, analysis of the B-N diagram provides an estimate of the optimal sowing density in order to minimize competition and avoid subsequent thinning operations. These results illustrate the utllity of managing cultivated populations in terms of biomass and density jointly.

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Production of Mussels, Mytilus Edulis, in Suspended Culture and Estimates of Carbon and Nitrogen Flow: Killary Harbour, Ireland

Cited by 38 publications

References 19 publications

Seasonal variation in C, N and P budgets and tissue composition of the mussel Mytilus edulis

Seasonal variation in C, N and P budgets and tissue composition of the mussel Mytilus edulis

Modelling nutrient and chlorophyll_a dynamics in an Irish brackish waterbody

Discriminating between food and space imitation in benthic suspension feeders using self-thinning relationships

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