A box-model of carrying capacity of the Thau lagoon in the context of ecological status regulations and sustainable shellfish cultures

Pete, Romain; Guyondet, Thomas; Bakhouche, Béatrice; Derolez, Valérie; Cesmat, Ludovic; Lagarde, Franck; Pouvreau, Stéphane; Fiandrino, Annie; Richard, Marion

doi:10.1016/j.ecolmodel.2020.109049

Cited by 15 publications

(7 citation statements)

References 56 publications

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“…To reach a satisfactory trade-off between uses, ecosystem services and maintaining biodiversity and ecological functions under global change, there is a need to use ecosystem-based models (Filgueira et al 2015;Guyondet et al, 2014;McKindsey et al, 2006). Such a model has been developed for Thau lagoon and showed that lagoon productivity significantly depends on hydrometerology, with higher oyster production in wet years than in dry years (Pete et al, 2020).…”

Section: Management Of Restoration and Shellfish Farmingmentioning

confidence: 99%

Fifty years of ecological changes: Regime shifts and drivers in a coastal Mediterranean lagoon during oligotrophication

Derolez

Malet

Fiandrino

et al. 2020

Science of The Total Environment

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Thau lagoon is a large Mediterranean coastal lagoons and it supports traditional shellfish farming activities. It has been subject to eutrophication leading to major anoxic events associated with massive mortalities of shellfish stocks. Since the 1970s, improvements have been made to wastewater treatment systems, which have gradually led to oligotrophication of the lagoon. The aim of our study was to determine how the decrease in nutrient inputs resulted in major ecological changes in Thau lagoon, by analysing five decades of time-series of observations on pelagic and benthic autotrophic communities. We were able to identify two periods during the oligotrophication process. Period 1 was considered a eutrophic period, characterised by the shift from seagrass dominance to dominance of red macroalgae. Period 2 (1993-2018), characterised by improved eutrophication status, was further divided into three: a transition phase (1993)(1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003) during which the water column continued to recover but the benthic community lagged behind in recovery and in partial resilience; a regime shift (2003)(2004)(2005)(2006), after which the water column became oligotrophic and seagrass began to recover (2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016)(2017)(2018). Considering anoxia crises as indicators of ecosystem resilience and resistance, we used a generalised linear model to analyse meteorological and environmental data with the aim of identifying the triggers of summer anoxia over the study period. Among the meteorological variables studied, air temperature had the strongest positive effect, followed by the period and wind intensity (both negative effects) and by rainfall in July (positive effect). The risk of triggering anoxia was lower in period 2, evidence for the increasing resistance of the ecosystem to climatic stress throughout the oligotrophication process. At the ecosystem scale and in the long term perspective, the ecological gains related to oligotrophication are especially important in the context of climate change, with more frequent and severe heat waves predicted.Please note that this is an author-produced PDF of an article accepted for publication following peer review. The definitive publisher-authenticated version is available on the publisher Web site.

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Section: Management Of Restoration and Shellfish Farmingmentioning

confidence: 99%

Fifty years of ecological changes: Regime shifts and drivers in a coastal Mediterranean lagoon during oligotrophication

Derolez

Malet

Fiandrino

et al. 2020

Science of The Total Environment

Self Cite

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“…The development of tools to evaluate "assimilative carrying capacity" is listed as an action plan in the new Strategic Plan for Sustainable Aquaculture 2021-2027. Other French studies developed a modeling tool to evaluate the effect of nitrogen and phosphorus inputs into the Thau Lagoon on oyster stocking densities and oyster performances, and the impact of stocking density on phytoplankton depletion and the ecological status of the lagoon based on metrics of dissolved inorganic nitrogen and phosphorous, and total nitrogen and phosphorous [104,105]. Despite the funding of ECC projects, French policy does not explicitly include ECC.…”

Section: Discussionmentioning

confidence: 99%

Ecological carrying capacity in mariculture: Consideration and application in geographic strategies and policy

et al. 2023

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“…To consider such interventions, management of sea channel openings or other actions, multi-factorial modelling can be a helpful tool to design potential scenarios and the reactions of ecosystems (e.g. GAMELag, Pete et al 2020). Our work is hence a valuable contribution for the potential application of this kind of modelling on small-surface lagoons, since this requires a deep knowledge base of the studied systems and of their responses towards local and global change (Gunaratne et al 2011;Jones et al 2018;Doughty et al 2019;Pérez-Ruzafa et al 2019;Teixeira and Solari 2020).…”

Section: Small Lagoons In the Larger-scale Context And Management Per...mentioning

confidence: 99%

Small Mediterranean coastal Lagoons Under Threat: Hydro-ecological Disturbances and Local Anthropogenic Pressures (Size Matters)

Ligorini

Crayol

Huneau

et al. 2023

Estuaries and Coasts

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Mediterranean coastal lagoons are affected by multiple threats (demographic pressures, eutrophication, climate change) expected to increase in the future and impact the ecosystem services provided. Conservation norms and scientific studies usually focus on large lagoons (> 0.5 km2) due to their economic importance, while they ignore smaller lagoons. These are poorly understood and often unprotected, despite their prevalence within the Mediterranean region and their importance. Qualitative and quantitative characterisation of small lagoons, in terms of functioning and sensitivity to global and local changes, are needed to develop appropriate management strategies. For this purpose, this work provides the first inventory of all Corsican lagoons and has investigated three of them of small size (Arasu, Santa Giulia, Balistra), characterised by contrasting anthropogenic contexts (highly modified/disturbed, medium disturbance, quasi-pristine). At the regional level, 91 of the 95 lagoons identified are < 0.5 km2, making Corsica a good example for the study of small Mediterranean lagoons. The three case studies showed differences in their seasonal biogeochemical cycles and phytoplankton communities (biomass, diversity, photosynthetic efficiency). Arasu and Santa Giulia lagoons showed an increase in watershed urbanisation (+ 12% and + 6% in 30 years), high phytoplankton biomass, low diversity and blooms of potentially harmful dinoflagellates. Conversely, Balistra lagoon showed a good status overall, but some anthropogenic pollution sources within its watershed. This study demonstrates the importance of small lagoons at regional and Mediterranean scale, and provides knowledge on studied local sites but also potential applications elsewhere. The importance of an integrated approach considering lagoons within their adjacent connected systems (watershed and sea) and anthropogenic contexts is highlighted.

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A box-model of carrying capacity of the Thau lagoon in the context of ecological status regulations and sustainable shellfish cultures

Cited by 15 publications

References 56 publications

Fifty years of ecological changes: Regime shifts and drivers in a coastal Mediterranean lagoon during oligotrophication

Fifty years of ecological changes: Regime shifts and drivers in a coastal Mediterranean lagoon during oligotrophication

Ecological carrying capacity in mariculture: Consideration and application in geographic strategies and policy

Small Mediterranean coastal Lagoons Under Threat: Hydro-ecological Disturbances and Local Anthropogenic Pressures (Size Matters)

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