Bivalve aquaculture and eelgrass: A global meta-analysis

Ferriss, Bridget E.; Conway-Cranos, Letitia L.; Sanderson, Beth L.; Hoberecht, Laura

doi:10.1016/j.aquaculture.2018.08.046

Cited by 41 publications

(19 citation statements)

References 57 publications

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“…3). This difference between aquaculture types is consistent with previous research that showed less impact of LL aquaculture on shoot density than OB culture, though both resulted in lower densities, and this difference was largely associated with mechanical harvest methods used in some OB culture areas (reviewed in Ferriss et al 2019). Although we did not survey the growers to determine the most recent harvest event or method, all 3 OB culture beds we studied were previously classed as mechanical harvest (B. R. Dumbauld pers.…”

Section: Habitat Structuresupporting

confidence: 90%

“…However, off-bottom culture is becoming increasingly popular due to regulatory constraints and market trends. This method can result in a higher-quality product for the half-shell market (Walton et al 2012) and has also been shown to reduce some impacts to eelgrass, as disturbance due to mechanical harvesting is reduced (Tallis et al 2009, Ferriss et al 2019. The ecological impacts of such practices, where cages, floats, rafts, lines, and supporting structures are also placed in the estuary, are less well-understood.…”

Section: Introductionmentioning

confidence: 99%

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On the edge: assessing fish habitat use across the boundary between Pacific oyster aquaculture and eelgrass in Willapa Bay, Washington, USA

Muething

Tomàs

Waldbusser

et al. 2020

Aquacult. Environ. Interact.

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Estuaries are subject to diverse anthropogenic stressors, such as shellfish aquaculture, which involve extensive use of estuarine tidelands. Pacific oyster Crassostrea gigas aquaculture is a century-old practice in US West Coast estuaries that contributes significantly to the regional culture and economy. Native eelgrass Zostera marina also commonly occurs in intertidal areas where oyster aquaculture is practiced. Eelgrass is federally protected in the USA as ‘essential fish habitat’, restricting aquaculture activities within or near eelgrass. To contribute scientific information useful for management decisions, we sought to compare fish habitat use of oyster aquaculture and eelgrass, as well as the edges between these 2 habitats, in Willapa Bay, Washington, USA. Furthermore, given a recent shift towards off-bottom culture methods, in part to protect seagrasses, long-line and on-bottom oyster aquaculture habitats were compared. A combination of direct (underwater video, minnow traps) and indirect (predation tethering units, eelgrass surveys) methods were employed to characterize differences in fish habitat use. Eelgrass density declined within both aquaculture habitats but less so within long-line aquaculture. Most fish species in our study used long-line oyster aquaculture and eelgrass habitats similarly with minimal edge effects, and on-bottom aquaculture was used less than either of the other 2 habitat types. These results are consistent with previously observed positive relationships between fish abundance and vertical habitat structure, but also reveal species-specific behavior; larger mesopredators like Pacific staghorn sculpins were sighted more often in aquaculture than in interior eelgrass habitats.

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Section: Habitat Structuresupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

On the edge: assessing fish habitat use across the boundary between Pacific oyster aquaculture and eelgrass in Willapa Bay, Washington, USA

Muething

Tomàs

Waldbusser

et al. 2020

Aquacult. Environ. Interact.

View full text Add to dashboard Cite

show abstract

“…Bivalves may not be consistently facilitated because many live infaunally or create their own structure and are less dependent on aboveground structure than mobile species in the water column. Another prior metaanalysis found that density and demography of seagrasses were generally negatively affected by bivalve shellfish aquaculture (Ferriss et al 2019). Of 28 publications reviewed by Ferriss et al (2019), five included field experiments without aquaculture gear and in small planted plots, and these experiments also appear in the present review addressing bivalve effects on seagrass.…”

Section: Discussionmentioning

confidence: 91%

Reciprocal Interactions between Bivalve Molluscs and Seagrass: A Review and Meta-Analysis

Fales

Boardman

Ruesink

2020

Journal of Shellfish Research

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“…Negatively affects seagrass meadows through scaring and smothering [20] Polygons of dredge fishing locations converted into raster [68] Dredging (anthropogenic) Negatively affects seagrass meadows through scaring and smothering [69] Polygons of European dredging activities converted into raster [70] Dumped Mat (anthropogenic) Negatively affects seagrass meadows through smothering [69] Polygons of dumping of dredge spoil material at sea converted into raster [71] Eco Status (anthropogenic) Negatively effects seagrass through increased nutrients [73] Point data of European shellfish aquaculture locations converted into raster [74] To evaluate the SDMs performance, we split each iteration of the 10-fold cross-validation into 80% training and 20% testing data as is common practice when independent test data are lacking [24]. We then averaged the resulting habitat suitability values and accuracy metrics across the 10 iterations.…”

Section: Layermentioning

confidence: 99%

Assessing the Impact of Physical and Anthropogenic Environmental Factors in Determining the Habitat Suitability of Seagrass Ecosystems

2020

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Blue Carbon ecosystems such as mangroves, saltmarshes and seagrasses have been shown to sequester large amounts of carbon, and subsequently are receiving renewed interest from policy experts in light of climate change. Globally, seagrasses remain the most understudied of these ecosystems, with their total geographic extent largely unknown due to challenges in mapping dynamic coastal environments. As such, species distribution models (SDMs) have been used to identify areas of high suitability, in order to inform our understanding of where unmapped meadows may be located or to identify suitable sites for restoration and/or enhancement efforts. However, many SDMs parameterized to project seagrass distributions focus on physical and not anthropogenic variables (i.e., dredging, aquaculture), which can have negative impacts on seagrass meadows. Here we used verified datasets to identify the potential distribution of Zostera marina and Zostera noltei at a national level for the Republic of Ireland, using 19 environmental variables including both physical and anthropogenic. Using the Maximum Entropy method for developing the SDM, we estimated approximately 95 km2 of suitable habitat for Z. marina and 70 km2 for Z. noltei nationally with high accuracy metrics, including Area Under the Curve (AUC) values of 0.939 and 0.931, respectively for the two species. We found that bathymetry, maximum sea-surface temperature (SST) and minimum salinity were the most important environmental variables that explained the distribution of Z. marina and that high standard deviation of SST, mean SST and maximum salinity were the most important variables in explaining the distribution of Z. noltei. At a national level, we noted that it was primarily physical variables that determined the geographic distribution of seagrass, not anthropogenic variables. We unexpectedly modelled areas of high suitability in locations of anthropogenic disturbance (i.e., dredging, high pollution risk), although this may be due to the binary nature of SDMs capturing presence-absence and not the size and condition of the meadows, suggesting a need for future research to explore the finer scale impacts of anthropogenic activity. Subsequently, this research should foster discussion for researchers and practitioners working on sustainability projects related to Blue Carbon.

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Bivalve aquaculture and eelgrass: A global meta-analysis

Cited by 41 publications

References 57 publications

On the edge: assessing fish habitat use across the boundary between Pacific oyster aquaculture and eelgrass in Willapa Bay, Washington, USA

On the edge: assessing fish habitat use across the boundary between Pacific oyster aquaculture and eelgrass in Willapa Bay, Washington, USA

Reciprocal Interactions between Bivalve Molluscs and Seagrass: A Review and Meta-Analysis

Assessing the Impact of Physical and Anthropogenic Environmental Factors in Determining the Habitat Suitability of Seagrass Ecosystems

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