Effects of body condition and water temperature on Anguilla anguilla glass eel migratory behavior

Édeline, Éric; Lambert, Patrick; Rigaud, Christian; Élie, Pierre

doi:10.1016/j.jembe.2005.10.011

Cited by 95 publications

(85 citation statements)

References 60 publications

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“…The lower value is in accordance with what reported by most authors, i.e. that temperature values lower then 5e4 C render glass eel inactive, while it has been reported that when the difference in temperature between sea and lagoon exceeds 5 or 6 C, glass eel entrance into colder waters may be prevented (Gandolfi et al, 1984;Jessop, 2003;Edeline et al, 2006). On the other hand, seasonal water temperatures influence movements of the younger eel stages (elver and bootlace stages) within the lagoon.…”

Section: Ecological Aspectssupporting

confidence: 90%

“…On the other hand, seasonal water temperatures influence movements of the younger eel stages (elver and bootlace stages) within the lagoon. Most studies explain that warmer water temperature is positively correlated with active swimming, growth, metabolism and pigmentation in both Atlantic and Pacific eel (Haro and Krueger, 1988;White and Knights, 1997;August and Hicks, 2008;Edeline et al, 2006;Luers et al, 2011).…”

Section: Ecological Aspectsmentioning

confidence: 99%

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Stage-specific distribution models can predict eel (Anguilla anguilla) occurrence during settlement in coastal lagoons

Leone

Zucchetta²,

Capoccioni

et al. 2016

Estuarine, Coastal and Shelf Science

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a b s t r a c tEel (Anguilla anguilla) is a catadromous fish species typical of Mediterranean coastal lagoons, that currently suffers from several anthropogenic and natural impacts. These are thought to be the cause of a stock-wide decline that this panmictic species is facing, in inland and coastal waters of Europe and North Africa. The decline affects both adult phases and recruitment, i.e. glass eel arrival to coastal waters and their ascent to inland waters. Quantitative features of eel recruitment reflect a transoceanic global scale, but also depend on local environmental conditions, the latter also affecting settlement dynamics in transitional waters. There is only little information on the dynamics of these two processes in coastal lagoons, notwithstanding the paramount importance of both in sustaining local stocks abundance and their demographic structure for this typical but also economically important inhabitant of Mediterranean lagoons, habitats that constitute an important share of the eel distribution area. The present study aims, therefore, to clarify space and time dynamics of local scale recruitment and of settlement in a coastal lagoon in the Mediterranean area, also by setting up a specific methodological approach. For this purpose, data from field surveys in combination with Species Distribution Models (SDMs) have been used in order to relate distribution of eel juvenile stages to the environmental conditions within the lagoon. Specifically, models were calibrated to quantify the relationship between presence of juvenile eel and the main environmental drivers, with the aim of identifying potential habitats for eel settlement within the lagoon. Results gained by modelling suggest certain spatial and temporal colonization patterns for the juvenile eel in the Fogliano lagoon, a typical Mediterranean coastal lake. The modelling approach has therefore proved to be a useful tool for predicting habitats for eel recruitment at the local scale and settlement, because adequate to catch the spatio-temporal dimensions of the processes under study, in coastal lagoon habitats.

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Section: Ecological Aspectssupporting

confidence: 90%

Section: Ecological Aspectsmentioning

confidence: 99%

Stage-specific distribution models can predict eel (Anguilla anguilla) occurrence during settlement in coastal lagoons

Leone

Zucchetta²,

Capoccioni

et al. 2016

Estuarine, Coastal and Shelf Science

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“…First, sedentary individuals in an experimental flume are shorter than swimmers (Bardonnet et al 2003). Second, under constant experimental conditions, glass eels switch from FW-to SW-preference as their body condition decreases (Edeline et al 2006). Third, glass eels that precociously settle in the estuary are lighter than river colonizers (Edeline et al 2004).…”

Section: Energetic Costs Of Diadromy: Increased Mortality Reduced Grmentioning

confidence: 97%

Adaptive phenotypic plasticity of eel diadromy

Édeline¹

2007

Mar. Ecol. Prog. Ser.

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Eels are marine teleosts that have ancestrally evolved a continental growth phase during which diadromy is facultative. This migratory plasticity reflects a fitness trade-off between search for the most productive habitats and competition avoidance favoring shift to less productive areas, while migration costs (increased mortality and reduced growth) hinder movements. To cope with these conflicting selective pressures acting in heterogeneous and unpredictable environments, eels have evolved a conditional evolutionarily stable strategy (ESS) with alternative tactics as a regulation mechanism for migratory plasticity. In this model, diadromy is considered as a threshold reaction norm to an individual's energetic status. In the population, this reaction norm evolves rapidly in response to changes in the cost/benefit fitness ratio of diadromy. This conditional ESS model may explain how the collapse of freshwater eel stocks results not only from decreased recruitment but also from an adaptive drop in the proportion of the diadromous phenotype in populations. Hence, I suggest that the decline in populations of eels has been less steep in salt than in freshwater habitats.

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“…This geographical shift may be explained by the latitudinal cline found in the timing of glass eel arrival to the different zone of the continental shelf (Tesch, 2003). Furthermore, since low water temperatures reduce the locomotive activity of glass eels (Elie and Rochard, 1994;Edeline et al, 2006), the latitudinal differences in their recruitment period to estuaries could be also related to differences in seasonal temperature patterns along the European coast. Therefore, additional knowledge on the behaviour of this species in its southernmost distribution areas could contribute to a better understanding of latitudinal variations in the continental recruitment of the European glass eel.…”

Section: Introductionmentioning

confidence: 99%

Oceanic and local environmental conditions as forcing mechanisms of the glass eel recruitment to the southernmost European estuary

Arribas¹,

Fernández-Delgado²,

Paterna

et al. 2012

Estuarine, Coastal and Shelf Science

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In order to asses the main oceanic and local environmental traits forcing the glass eel Anguilla anguilla (L., 1758) recruitment to the southernmost European estuary, glass eels recruitment pattern to the Guadalquivir River estuary was studied during nine successive migration seasons (June 1997-December 2006) using a fishery-independent experimental survey at three sampling sites in the estuary. A clear seasonal pattern was observed: density was highest between late autumn and spring with two migration peaks, and lowest during summer. Short-term (inter-month) changes in glass eel density were partially driven by local environmental variables, such as estuarine turbidity, local rainfall and water temperature. Long-term (inter-year) changes were positively correlated with oceanic factors related to recruitment success (NAO index and primary production at the spawning area) as well as local environmental factors (westerly and southerly wind mixing indices and rainfall). Spatial changes in glass eel density within the estuary depended on tidal and light situations; however, maximum densities were mainly observed at diurnal and/or nocturnal flood tides. Although it has been widely known since the 1980s that the abundance of European glass eels is decreasing, during this study there was no evidence of a declining trend, probably because the time series was not long enough.

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Effects of body condition and water temperature on Anguilla anguilla glass eel migratory behavior

Cited by 95 publications

References 60 publications

Stage-specific distribution models can predict eel (Anguilla anguilla) occurrence during settlement in coastal lagoons

Stage-specific distribution models can predict eel (Anguilla anguilla) occurrence during settlement in coastal lagoons

Adaptive phenotypic plasticity of eel diadromy

Oceanic and local environmental conditions as forcing mechanisms of the glass eel recruitment to the southernmost European estuary

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