Effects of spatial scale on assessments of suspension bivalve aquaculture for productivity and environmental impacts

Sakamaki, Takashi; Zheng, Yizhe; Hatakeyama, Yuji; Fujibayashi, Megumu; Nishimura, Osamu

doi:10.1016/j.aquaculture.2022.738082

Cited by 8 publications

(3 citation statements)

References 47 publications

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“…The increasing differences in carbon flux between the scenarios (with and without farm) over time indicate an effect of clam growth, as larger body size is commonly related to higher ingestion and egestion rates . Clam growth is also strongly linked to environmental factors, e.g., temperature and seston concentration, which consequently also affect benthic carbon flux.…”

Section: Resultsmentioning

confidence: 99%

“…Organic carbon was assumed to originate from terrestrial and marine sources, as well as biodeposits specifically, as these three sources are widely recognized as the main components in coastal bivalve farms. , Each component is defined by distinctive δ 13 C and δ 15 N signatures that are used to quantify the contribution of each component to the TOC of sediments. The different source proportions were estimated based on the δ 13 C and δ 15 N three-end-member mixing model …”

Section: Methodsmentioning

confidence: 99%

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Vacuum Effect: A Redistribution Process of Organic Carbon Mediated by Bivalve Farming

Sun,

Filgueira,

Wang

et al. 2023

ACS EST Water

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Bivalve farming affects the spatiotemporal distribution of organic carbon deposition to benthic environments, potentially altering ecosystem functioning. In this study, spatiotemporal patterns of benthic organic carbon flux of a bottom-based Manila clam (Ruditapes philippinarum) farm were estimated for a 1 year farming cycle using a carbon flux model coupled to a two-dimensional (2-D) hydrodynamic (MIKE-3) and a clam dynamic energy budget (DEB) model. The simulated flux was compared to the sediment total organic carbon (TOC) and contribution of biodeposits to sediment TOC based on stable isotope signatures. The outputs of the model illustrated a clear “vacuum effect” with increased carbon flux within and near the farming area (deposition area) and reduced flux outside the farm (depletion area), which could also correspond to changes in sediment TOC. Moreover, the contribution of biodeposits to the carbon flux was overall higher compared to that of biodeposits to sediment TOC, indicating a loss of biodeposits from deposition to storage in the sediment. This study highlights the role clam farming plays in the dynamics of organic carbon by linking vertical fluxes with sediment TOC, which addresses the current knowledge gaps related to the carbon footprint in coastal bivalve aquaculture systems.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Vacuum Effect: A Redistribution Process of Organic Carbon Mediated by Bivalve Farming

Sun,

Filgueira,

Wang

et al. 2023

ACS EST Water

View full text Add to dashboard Cite

show abstract

“…Aquaculture allows for the systematic and stable production of aquatic organisms and thus plays an important role in the marine product supply (Diana, 2009). However, marine aquaculture is known to generate environmental impact in the form of organic matter such as feed (leftovers) and feces on the aquaculture sites and surrounding areas (Carroll et al., 2003; Sakamaki et al., 2022), which can potentially alter the local biodiversity (Pietros & Rice, 2003; Sakamaki et al., 2022; Sasaki et al., 2002; Tsutsumi, 1995; Tsutsumi & Inoue, 1996). While less mobile macrobenthos were traditionally used as bioindicators to evaluate the impact of aquaculture on the local ecosystem (Frühe et al., 2021; Yokoyama et al., 2002), little is understood about the potential impacts on fish communities despite the ecological and economic importance of fish in marine ecosystems (Tsuyuki & Umino, 2018).…”

Section: Introductionmentioning

confidence: 99%

Assessing the impacts of aquaculture on local fish communities using environmental DNA metabarcoding analysis

Suzuki,

Otomo,

Dazai

et al. 2024

Environmental DNA

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Fish aquaculture potentially affects the local ecosystem through feed (leftovers) and feces. However, evaluation of its impacts on biodiversity, especially those of mobile organisms such as fish, is not straightforward. Here, we report a case study in which environmental DNA (eDNA) metabarcoding with MiFish universal primers for the 12S rRNA region of fish is used to detect and assess the impact of aquaculture on local fish communities. In Shizugawa Bay, Minamisanriku Town, Miyagi Prefecture, Japan, Oncorhynchus kisutch (coho salmon) is aquacultured in sea cages from November to July, but is absent from August to October. We conducted eDNA surveys in June, August, October, and December 2021 of water at depths of 5 m and 1 m above the bottom obtained from two sites, one approximately 100 m and the other approximately 2500 m from the nearest aquaculture site. The total number of operational taxonomic units (OTUs) detected was 122, with a maximum of 50 and a minimum of 10. With distance‐based redundancy analysis (dbRDA) and PERMANOVA applied to the eDNA‐based community compositional data, we detected a significant effect of the presence of O. kisutch aquaculture on fish biodiversity. The generalized linear model (GLM) applied to each detected OTUs indicated that the aquaculture was associated positively with Leucopsarion petersii (ice goby), and Oncorhynchus spp. and negatively with Chaenogobius annularis (forktongue goby). Environmental DNA metabarcoding surveys, combined with multivariate statics, are a promising tool to identify the dimension of biodiversity that human activity affects and would serve as a basic survey for sustainable use of the sea.

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Sedimentation of Crassostrea gigas and Perna perna biodeposits in the South Atlantic

Silva,

Gomes,

Garbossa

et al. 2024

Aquacultural Engineering

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Effects of spatial scale on assessments of suspension bivalve aquaculture for productivity and environmental impacts

Cited by 8 publications

References 47 publications

Vacuum Effect: A Redistribution Process of Organic Carbon Mediated by Bivalve Farming

Vacuum Effect: A Redistribution Process of Organic Carbon Mediated by Bivalve Farming

Assessing the impacts of aquaculture on local fish communities using environmental DNA metabarcoding analysis

Sedimentation of Crassostrea gigas and Perna perna biodeposits in the South Atlantic

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