Impacts of environmental conditions and management of sluice gates on glass eel migration

Bouchard, Colin; Boutron, Olivier; Lambremon, Jordane; Drouineau, Hilaire; Lambert, Patrick; Nicolas, Delphine

doi:10.1016/j.ecss.2022.108139

Cited by 1 publication

(6 citation statements)

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“…Within this system, another potential migration route involves water pumps located along the Rhône, used for crop field irrigation. The signal from these pumps is highly variable due to agricultural activities (Bouchard, Boutron, et al, 2022a; Poizat et al, 1999). A newly emerging alternative migration route corresponds to former salt marshes that have been undergoing re‐naturalization since 2011.…”

Section: Discussionmentioning

confidence: 99%

“…A newly emerging alternative migration route corresponds to former salt marshes that have been undergoing re‐naturalization since 2011. However, the recruitment signal through this route is not yet significant (Bouchard, Boutron, et al, 2022a), partly because there is no freshwater attraction at this site and the re‐naturalization program is still ongoing. Overall, the Grau de la Fourcade serves as the most accessible and attractive entry point for the Vaccarès signal.…”

Section: Discussionmentioning

confidence: 99%

“…This suggests that our model effectively utilized the residual term to offset or enhance the impact of the seasonality term for specific sampling events. This seasonality signal is stronger at the Fourcade site, which serves as the main entry point into the Vaccarès system, as noted in several studies (Bevacqua et al, 2019;Bouchard, Boutron, et al, 2022a;Crivelli et al, 2008). Comparing absolute recruitment values across sites remains challenging (Bouchard, Boutron, et al, 2022a).…”

Section: T a B L Ementioning

confidence: 93%

“…This seasonality signal is stronger at the Fourcade site, which serves as the main entry point into the Vaccarès system, as noted in several studies (Bevacqua et al, 2019;Bouchard, Boutron, et al, 2022a;Crivelli et al, 2008). Comparing absolute recruitment values across sites remains challenging (Bouchard, Boutron, et al, 2022a). Within this system, another potential migration route involves water pumps located along the Rhône, used for crop field irrigation.…”

Section: T a B L Ementioning

confidence: 98%

“…The study site is composed of two main connected lagoons, the Vaccarès pond (c: 6400 ha), which is the most inland, and the Impériaux pond (c: 4600 ha), which is located between the Mediterranean Sea and the Vaccarès pond (Figure 1). Previous studies have shown that eels settle in the Vaccarès pond, where some complete their growth (Bevacqua et al, 2019;Bouchard, Boutron, et al, 2022a;Melia et al, 2006). An artificial channel called the Grau de la Fourcade, located on the town of Saintes-Maries de la mer (Figure 1), represents the main connection between the sea and the inland hydro-system with a weak tidal amplitude (20-30 cm, Bouchard, Drouineau, et al, 2022b;Crivelli et al, 2008).…”

Section: Study Sitementioning

confidence: 99%

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Estimating migration speed of glass eels during their colonization of a Mediterranean lagoon

Bouchard

Nicolas

2023

Journal of Fish Biology

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Migration speed can have important evolutionary consequences as it can affect the timing of arrival, remaining energy reserves, and habitat choice. Environmental conditions and individual phenotypic traits can impact the migration speed of individuals. In this way, estimating migration speed is of particular importance, especially for species under strong management strategies and colonizing highly diversified habitats, as is the case for the European eel. However, estimating the migration speed of glass eels, which is the life stage when eels colonize continental habitats, presents challenges due to typically low re‐capture probabilities and difficulties in tagging individuals. Using recruitment time series at two sites, one at the sea connection and another inland, we estimated the temporal lag between the two migration peaks to compute migration speed. Because we worked on the Mediterranean coasts and in a lagoon, the weak tidal amplitudes may inhibit individuals from efficiently performing the selective tidal stream transport. We obtained migration speed values coherent with the few values available in the literature for Atlantic estuaries. The values we obtained that are lower than those obtained for Atlantic estuaries are also coherent with the weak tides along the Mediterranean coasts and lead to necessary further studies to understand the migratory behavior of glass eels in such hydro‐systems.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%