Bayesian inference of physicochemical quality elements of tropical lagoon Nokoué (Benin)

HOUNYEME, Romuald; Logez, Maxime; Mama, Daouda; Argillier, Christine

doi:10.1007/s10661-023-10957-9

Cited by 2 publications

(3 citation statements)

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“…We can also explain the negative in uence of dredging activities (Observation characteristic of this type of pressure proxy 'Depth') which likely lead to the suspension of sediment in the water column, by its abrasive effects on the eggs, by its reduction of the pumping rate of the bivalves and by their direct mortality (Wilber & Clarke 2001). In the context of Nokoué, resuspension is also driven by waves (wind effect or AWS) (Hounyèmè et al 2023). The negative effects of acidi cation (Bressan et al 2014;Ventura 2018), temperature and salinity on bivalves have also been demonstrated in the literature.…”

Section: Selected Metrics and Coherence Of Metric Responsesmentioning

confidence: 99%

“…This is not very severe compared to the options taken in other studies/areas (Argillier et al (2012b). This may be due to the sampling points not being in a position to re ect the changes in the catchment (Hounyèmè et al 2023). Regarding TKN, the 0.9 mg/L corresponds to the standard lower limit proposed for e uent discharge to surface waters, which is on the order of 100 mg/L (Dash 2013; classes for the quality status obtained in the low salinity areas of the Mira estuary (Portugal) (Medeiros et al 2012).…”

Section: Coherence Of Metrics Reference Values and Thresholdsmentioning

confidence: 99%

“…The stress threshold value obtained for total phosphorus (1.03mg/L), it is well above the US EPA reference (0.03-0.1mg/L). Such a high total phosphorus threshold is unique to this lagoon system which already has an endogenous stock of total phosphorus(Hounyèmè et al 2023). Overall, the current stress thresholds observed are above the US EPA threshold for BOD (< 6 mg/L for US EPA vs 7.19 mg/L) and orthophosphates (range of 0.025-0.18 mg/L for US EPA vs 0.23-0.41 mg/L).On the other hand, they are equivalent or better for nitrates (0.25-45 mg/L vs 0.25-0.41 mg/L), DO (3-5 mg/L for US EPA vs 4.01-7.82 mg/L), transparency (0.3-2.5 m for US EPA vs 0.56-1.32 m), temperature (20-30oC for US EPA vs 23.71-27.2) and pH (6-8.5 for US EPA vs 7.58-8.7).…”

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confidence: 99%

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From responses of macroinvertebrate metrics to the definition of reference metrics and stressor threshold values

HOUNYEME

Mama

Argillier

2023

Stoch Environ Res Risk Assess

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The present study focused on using benthic macrofauna to assess the risks of moving away from Good Ecological Status towards the functioning of an anthropized system (Nokoué-Benin), based on de ning reference values for macroinvertebrate metrics, stress thresholds and the responses of selected metrics to stressors. The approach used is a combination of a joint species distribution model and Bayesian networks. We used JSDM to select relevant metrics and generate posterior probabilities. We then converted these posterior probabilities into posterior response probabilities for each of the stress levels and fed them into a Bayesian network. To de ne the reference values of the metrics and the stress thresholds derived from the probability density diagrams for low-pressure levels, we used the responses predicted by the Bayesian network. An application of this approach was then carried out on a lagoon sampled during high and low water periods for three consecutive years (2004)(2005)(2006), with 33 macroinvertebrate taxa present in all seasons and sampling points, and measurements of 14 environmental parameters used as application data. This study demonstrated a reliable inference, the selection of seven relevant metrics and the de nition of reference conditions. The relevance of the metrics and ecological assessment criteria, despite the small sample size, suggests the potential for wider applicability of the approach to aquatic ecosystem monitoring and assessment programs in developing countries, which are generally characterized by a lack of monitoring data.

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Section: Selected Metrics and Coherence Of Metric Responsesmentioning

confidence: 99%

Section: Coherence Of Metrics Reference Values and Thresholdsmentioning

confidence: 99%

mentioning

confidence: 99%

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From responses of macroinvertebrate metrics to the definition of reference metrics and stressor threshold values

HOUNYEME

Mama

Argillier

2023

Stoch Environ Res Risk Assess

Self Cite

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show abstract

From responses of macroinvertebrate metrics to the definition of reference metrics and stressor threshold values

HOUNYEME

Mama

Christine

2023

Preprint

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The present study focused on using benthic macrofauna to assess the risks of moving away from Good Ecological Status towards the functioning of an anthropized system (Nokoué-Benin), based on defining reference values for macroinvertebrate metrics, stress thresholds and the responses of selected metrics to stressors. The approach used is a combination of a joint species distribution model and Bayesian networks. We used JSDM to select relevant metrics and generate posterior probabilities. We then converted these posterior probabilities into posterior response probabilities for each of the stress levels and fed them into a Bayesian network. To define the reference values of the metrics and the stress thresholds derived from the probability density diagrams for low-pressure levels, we used the responses predicted by the Bayesian network. An application of this approach was then carried out on a lagoon sampled during high and low water periods for three consecutive years (2004-2006), with 33 macroinvertebrate taxa present in all seasons and sampling points, and measurements of 14 environmental parameters used as application data. This study demonstrated a reliable inference, the selection of seven relevant metrics and the definition of reference conditions. The relevance of the metrics and ecological assessment criteria, despite the small sample size, suggests the potential for wider applicability of the approach to aquatic ecosystem monitoring and assessment programs in developing countries, which are generally characterized by a lack of monitoring data.

show abstract

Bayesian inference of physicochemical quality elements of tropical lagoon Nokoué (Benin)

Cited by 2 publications

References 80 publications

From responses of macroinvertebrate metrics to the definition of reference metrics and stressor threshold values

From responses of macroinvertebrate metrics to the definition of reference metrics and stressor threshold values

From responses of macroinvertebrate metrics to the definition of reference metrics and stressor threshold values

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