In situ biodeposition rates of Pacific oysters (Crassostrea gigas) on a marine farm in Southern Tasmania (Australia)

Mitchell, I

doi:10.1016/j.aquaculture.2005.02.061

Cited by 54 publications

(33 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Biodeposition typically occurs when, for example, mussel and oyster beds act as biological filters that concentrate suspended particulate matter from the water column as faeces and pseudo faeces. These aggregated 'bio deposits' are heavier than their constituent particles and settle rapidly on the seafloor beneath the bed (Mitchell 2006, Forrest et al 2009). Conversely, active surface and subsurface defecation by burrow-dwelling organisms and associated non-local mixing of ingested sediment and detritus must be considered an integrated part of our definition of bioturbation.…”

Section: Our Definitionmentioning

confidence: 99%

What is bioturbation? The need for a precise definition for fauna in aquatic sciences

Kristensen

Penha‐Lopes²,

Delefosse

et al. 2012

Mar. Ecol. Prog. Ser.

697

489

View full text Add to dashboard Cite

The term 'bioturbation' is frequently used to describe how living organisms affect the substratum in which they live. A closer look at the aquatic science literature reveals, however, an inconsistent usage of the term with increasing perplexity in recent years. Faunal disturbance has often been referred to as particle reworking, while water movement (if considered) is re ferred to as bioirrigation in many cases. For consistency, we therefore propose that, for contemporary aquatic scientific disciplines, faunal bioturbation in aquatic environments includes all transport processes carried out by animals that directly or indirectly affect sediment matrices. These processes include both particle reworking and burrow ventilation. With this definition, bioturbation acts as an 'umbrella' term that covers all transport processes and their physical effects on the substratum. Particle reworking occurs through burrow construction and maintenance, as well as ingestion and defecation, and causes biomixing of the substratum. Organic matter and microorganisms are thus displaced vertically and laterally within the sediment matrix. Particle reworking animals can be categorized as biodiffusors, upward conveyors, downward conveyors and regenerators depending on their behaviour, life style and feeding type. Burrow ventilation occurs when animals flush their open-or blind-ended burrows with overlying water for respiratory and feeding purposes, and it causes advective or diffusive bioirrigation ex change of solutes between the sediment pore water and the overlying water body. Many bioturbating species perform reworking and ventilation simultaneously. We also propose that the effects of bioturbation on other organisms and associated processes (e.g. microbial driven biogeochemical transformations) are considered within the conceptual framework of ecosystem engineering.

show abstract

Section: Our Definitionmentioning

confidence: 99%

What is bioturbation? The need for a precise definition for fauna in aquatic sciences

Kristensen

Penha‐Lopes²,

Delefosse

et al. 2012

Mar. Ecol. Prog. Ser.

697

489

View full text Add to dashboard Cite

show abstract

“…The intensive development of bivalve aquaculture results in major alterations of ecosystem processes, including an impact on benthic-pelagic coupling (sedimentation and remineralization) (Crawford et al 2003, Giles et al 2006, Mitchell 2006 and nutrient regeneration in the water column through bivalve excretion (Leblanc et al 2003, Mazouni 2004, Nizzoli et al 2005. Under nutrient-limiting conditions, it is argued that such enhancement of nutrient cycling may stimulate primary production (Asmus & Asmus 1991, Dame & Libes 1993.…”

Section: Introductionmentioning

confidence: 99%

Influence of farmed pearl oysters and associated biofouling communities on nutrient regeneration in lagoons of French Polynesia

Lacoste¹,

Gueguen²,

Moullac³

et al. 2014

Aquacult. Environ. Interact.

View full text Add to dashboard Cite

Bivalve cultivation can significantly contribute to nutrient cycling in semi-enclosed ecosystems. We investigated the influence of suspended pearl oyster culture on nutrient regeneration in the water column of 3 oligotrophic lagoons in French Polynesia. The aim of this first study performed in a tropical area was to assess the seasonal variability of nutrient fluxes and to quantify the contribution of biofouling communities. In situ metabolic enclosure systems were used to measure nutrient uptake or release by 'cultivation units' (i.e. 4 pearl oysters with or without associated biofouling). In all 3 study lagoons (Tahiti, Mangareva, Ahe), nutrient fluxes produced by pearl oyster and associated biofouling communities (CR units) were 4-to 6-fold higher than those measured for cleaned pearl oysters. CR units can release dissolved inorganic nitrogen and soluble reactive phosphorus in the water column at a rate of 200 and 50 µmol h −1 , respectively. Trophic level and composition of biofouling communities may explain the variations of fluxes observed between the different islands. At the pearl farm scale (Ahe), pearl oyster long-lines may supply 70% of the inorganic nitrogen demand for primary production, with biofouling communities accounting for 60% of the total nutrient release. Pearl oyster culture enhances nutrient availability and alters stoichiometry, which can strongly modify the dynamics of the planktonic ecosystem.

show abstract

“…We have demonstrated that the health, but not the biological activity, of Crassostrea gigas and Ostrea edulis are altered by future environmental conditions and that the magnitude of this response is dependent on the presence and type of competitive interaction. Effects of exposure to elevated CO 2 are likely due to disruption of the acid−base balance leading to physiological changes (Lannig et al 2010 ) used here (Mitchell 2006). This has implications for determining appropriate stocking densities for oyster management and/or restoration initiatives.…”

Section: Discussionmentioning

confidence: 99%

Competitive interactions moderate the effects of elevated temperature and atmospheric CO2 on the health and functioning of oysters

Green¹,

Christie²,

Pratt³

et al. 2017

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Global increases in sea temperatures and atmospheric concentrations of CO 2 may affect the health of calcifying shellfish. Little is known, however, about how competitive inter actions within and between species may influence how species respond to multiple stressors. We experimentally assessed separate and combined effects of temperature (12 or 16°C) and atmospheric CO 2 concentrations (400 and 1000 ppm) on the health and biological functioning of native (Ostrea edulis) and invasive (Crassostrea gigas) oysters held alone and in intraspecific or inter specific mixtures. We found evidence of reduced phagocytosis under elevated CO 2 and, when combined with increased temperature, a reduction in the number of circulating haemocytes. Generally, C. gigas showed lower respiration rates relative to O. edulis when the species were in intraspecific or interspecific mixtures. In contrast, O. edulis showed a higher respiration rate relative to C. gigas when held in an interspecific mixture and exhibited lower clearance rates when held in intraspecific or interspecific mixtures. Overall, clearance rates of C. gigas were consistently greater than those of O. edulis. Collectively, our findings indicate that a species' ability to adapt metabolic processes to environmental conditions can be modified by biotic context and may make some species (here, C. gigas) competitively superior and less vulnerable to future climatic scenarios at local scales. If these conclusions are generic, the relative role of species interactions, and other biotic parameters, in altering the outcomes of climate change will require much greater research emphasis.

show abstract

In situ biodeposition rates of Pacific oysters (Crassostrea gigas) on a marine farm in Southern Tasmania (Australia)

Cited by 54 publications

References 33 publications

What is bioturbation? The need for a precise definition for fauna in aquatic sciences

What is bioturbation? The need for a precise definition for fauna in aquatic sciences

Influence of farmed pearl oysters and associated biofouling communities on nutrient regeneration in lagoons of French Polynesia

Competitive interactions moderate the effects of elevated temperature and atmospheric CO2 on the health and functioning of oysters

Contact Info

Product

Resources

About