Anguilles estuariennes et fluviales : apports de l'otolithométrie

Mounaix, Béatrice; Fontenelle, Guy

doi:10.1051/kmae:1994005

Cited by 14 publications

(12 citation statements)

References 16 publications

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“…1995) but they failed in separating the effects of latitude and habitat. Previous work that focused on a single catchment at a time, as in the Gironde Garonne Dordogne catchment (Daverat & Tomas 2006) and in the Vilaine catchment (Mounaix & Fontenelle 1994), also concluded that growth was faster in the estuary rather than upstream in the catchment.…”

Section: Discussionmentioning

confidence: 99%

One century of eel growth: changes and implications

Daverat

Beaulaton

Poole

et al. 2012

Ecology of Freshwater Fish

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– A cooperative effort gathered a large European length‐at‐age data set (N = 45,759, Lat. 36S–61N Long. 10W–27E) for Anguilla anguilla, covering one century. To assess the effect of global warming during the last century and habitat effects on growth, a model was fitted on the data representing the conditions met at the distribution area scale. Two GLMs were designed to predict eel log(GR): one model was fitted to the whole data and the other was fitted to the female data subset. A model selection procedure was applied to select the best predictors among sex, age class, five temperature parameters and six habitat parameters (depth, salinity and four variables related to the position in the catchment). The yearly sum of temperatures above 13 °C (TempSUP13), the relative distance within the catchment, sex, age class, salinity class and depth class were finally selected. The best model predicted eel log(GR) with a 64.46% accuracy for the whole data and 66.91% for the female eel data. Growth rate (GR) was greater in habitats close to the sea and in deep habitats. TempSUP13 variable had one of the greatest predictive powers in the model, showing that global warming had affected eel growth during the last century.

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Section: Discussionmentioning

confidence: 99%

One century of eel growth: changes and implications

Daverat

Beaulaton

Poole

et al. 2012

Ecology of Freshwater Fish

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“…(2003) and Daverat & Tomas (2006), conditions in coastal and estuarine brackish waters lead to a higher and more constant eel growth than straight riverine reaches. Indeed, estuaries are generally highly productive, and in addition, offer buffered conditions, especially in terms of temperature (Mounaix & Fontenelle 1994; Morrison & Secor 2003; Daverat et al. 2006; Costa et al.…”

Section: Discussionmentioning

confidence: 99%

“…The analysis of the body condition revealed that eels were relatively fatter in the lower reaches of the study area which was located in the tidal freshwater zone of the estuary, whereas segments B and C were outside tidal influence. According to Mounaix & Fontenelle (1994), Acou et al (2003) and Daverat & Tomas (2006), conditions in coastal and estuarine brackish waters lead to a higher and more constant eel growth than straight riverine reaches. Indeed, estuaries are generally highly productive, and in addition, offer buffered conditions, especially in terms of temperature (Mounaix & Fontenelle 1994;Morrison & Secor 2003;Costa et al 2008).…”

Section: Longitudinal Patternsmentioning

confidence: 99%

“…According to Mounaix & Fontenelle (1994), Acou et al (2003) and Daverat & Tomas (2006), conditions in coastal and estuarine brackish waters lead to a higher and more constant eel growth than straight riverine reaches. Indeed, estuaries are generally highly productive, and in addition, offer buffered conditions, especially in terms of temperature (Mounaix & Fontenelle 1994;Morrison & Secor 2003;Costa et al 2008). Although water was fresh in segment A, it is very likely that the higher body condition of individuals located in this segment is the result of the proximity of brackish waters which probably provides good environmental conditions for eel growth.…”

Section: Longitudinal Patternsmentioning

confidence: 99%

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European eel distribution and body condition in a river floodplain: effect of longitudinal and lateral connectivity

Lasne

Acou

Vila‐Gispert

et al. 2008

Ecology of Freshwater Fish

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International audienceWe studied eel population characteristics (size classes, densities and body condition) in the lower Loire River floodplain (France) to evaluate the effects of longitudinal and lateral gradients. A total of 36 sites were electrofished in June 2005. The sites were grouped first into three river segments according to the distance inland corresponding to a longitudinal gradient and secondly into three lateral connectivity categories. Results indicate that small eels, especially those ≤300 mm, were very abundant downstream but density rapidly decreased upstream. In addition, eels ≤150 mm tended to be most abundant in connected waterbodies. Conversely, the distribution of larger eels was quite uniform across both dimensions. Eel condition decreased upstream. In parallel, in downstream river segment, eels had a lower condition in disconnected waterbodies than in connected ones. Eel specialists still have only a longitudinal perception of eel habitat. Our results suggest that lateral gradients should be also taken into consideratio

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“…Furthermore, marine and estuarine eels tend to grow faster than river eels (Fernandez-Delgado et al 1989, Mounaix & Fontenelle 1994, Tzeng et al 2003, Arai et al 2004, Jessop et al 2004. The drivers of these divergent life histories are still poorly understood.…”

Section: Discussionmentioning

confidence: 99%

Role of glass eel salinity preference in the control of habitat selection and growth plasticity in Anguilla anguilla

Édeline¹,

Dufour²,

Élie³

2005

Mar. Ecol. Prog. Ser.

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Eels colonize either marine, estuarine or freshwater habitats, with marine and estuarine eels tending to grow faster than freshwater eels. The reasons for these divergent migratory tactics and growth trajectories remain poorly understood. In order to investigate the role of salinity preferences of glass eels in the control of habitat selection and growth plasticity, we sorted different contingents of glass eels Anguilla anguilla through 2 consecutive salinity preference tests. This allowed us to study the link between salinity preference and locomotor activity (i.e. positive rheotaxis), and to distinguish contingents of glass eels that were either plastic or fixed in their preference for freshwater (FW) or saltwater (SW). Subsequently, we monitored somatic growth of the different contingents in controlled SW and FW rearing conditions. Preference for FW was linked to high locomotor activity, a behavioral pattern likely to promote colonization of FW habitats in the wild. Accordingly, FWC (FW contingent, i.e. glass eels that preferred FW twice) exhibited poor growth, similar to those observed in wild FW eel populations. In contrast, preference for SW was linked to low locomotor activity, and the SWC (SW contingent, i.e. glass eels that preferred SW twice) had high growth rates in SW, as observed in wild marine and estuarine populations. The PCC (plastic contingent, i.e. glass eels that swappped their salinity preference) had an intermediary growth status that could be related to the 'nomad' life style of eels migrating between different habitat types during their life. Growth was significantly higher in SW compared to FW in all contingents, indicating that habitat salinity may directly affect growth, irrespective of food availability. Our results demonstrated that glass eel salinity preference was linked to their locomotor activity and growth performance, and provided a comprehensive ecological mechanism for the control of habitat distribution and growth patterns observed in wild eel populations.

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Anguilles estuariennes et fluviales : apports de l'otolithométrie

Cited by 14 publications

References 16 publications

One century of eel growth: changes and implications

One century of eel growth: changes and implications

European eel distribution and body condition in a river floodplain: effect of longitudinal and lateral connectivity

Role of glass eel salinity preference in the control of habitat selection and growth plasticity in Anguilla anguilla

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