Relationships between locomotor behavior, morphometric characters and thyroid hormone levels give evidence of stage-dependent mechanisms in European eel upstream migration

Imbert, Hélène; Arrowsmith, Rory; Dufour, Sylvie; Élie, Pierre

doi:10.1016/j.yhbeh.2007.06.011

Cited by 29 publications

(20 citation statements)

References 62 publications

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“…Our analysis discriminated a group of fish characterized by high body condition loss, high activity and high initial body condition/early pigmentation stage. Based on present result and in accordance with Imbert et al (2008), these fish would be the most prone to colonize rivers. Passive fish was the other category of fish discriminated by our work, but their behaviour was not related to body condition or to activity.…”

Section: Resultssupporting

confidence: 85%

“…Once fish has resumed feeding, energetic status and body condition both partly reflects the local availability of food and the degree of competition to get access to this resource. Recent results have underlined the positive role of elver body condition in locomotor activity (Imbert et al, 2008). Interestingly, glass eels' body condition (Edeline et al, 2006) and energetic status (Bureau du Colombier et al, 2007) are also involved in settlement.…”

Section: Introductionmentioning

confidence: 99%

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Relationships between individual behaviour and morphometry under different experimental conditions of temperature and feeding in glass eels (Anguilla anguilla)

Bardonnet

Labonne²,

Laffite³

et al. 2008

Knowl. Managt. Aquatic Ecosyst.

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After Anguilla anguilla larvae reach the European coast, metamorphosing glass eels exhibit an estuarine migration phase and can potentially colonize the continental area. Associated behaviours to upstream movement in estuary and river basin differ strongly: passive tidal transport in estuary, active swimming beyond the upstream tidal limit. Moreover, the migratory behaviour may shift towards a density-dependent dispersal beyond this limit. A positive relationship has previously been established between glass eels' body condition and migratory behaviour in estuary and also higher in the river basin. An experiment was settled to test for the density-dependent versus migratory behaviour under controlled conditions. The relationships between some behaviours (swimming, grouping, feeding, and aggressiveness) and body condition was investigated at the individual level. Two controlled factors were crossed, leading to four combinations of high and low levels of food and temperature. The high level of food led to a lesser loss in body condition. Swimming activity was positively related to initial body condition and loss in body condition, but these two variables were not related to aggressiveness. We conclude that the density-dependent dispersal hypothesis was not reinforced by these present results. RÉSUMÉRelations entre comportement individuel et morphométrie sous différentes conditions expérimentales de température et de nourriture chez les anguilles européennes (Anguilla anguilla) L'anguille européenne est un poisson migrateur dont les larves parviennent jusqu'à nos côtes où elles se métamorphosent en civelles qui colonisent le milieu continental après une phase de migration estuarienne, suivie ou non par la colonisation du bassin versant. Les comportements associés au déplacement amont dans ces deux milieux diffèrent fortement : une nage « portée » par le courant durant le flot en estuaire, une nage active en limite amont d'estuaire. Une corrélation positive a déjà été établie entre le facteur de condition et le potentiel migratoire de l'anguille (que ce soit en estuaire ou en phase de colonisation du bassin versant). Par ailleurs,

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Section: Resultssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Relationships between individual behaviour and morphometry under different experimental conditions of temperature and feeding in glass eels (Anguilla anguilla)

Bardonnet

Labonne²,

Laffite³

et al. 2008

Knowl. Managt. Aquatic Ecosyst.

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show abstract

“…Ingress of glass eels up-estuary is facilitated by selective tidal stream transport, but in encountering freshwater currents, juvenile eels either have the physiological wherewithal to continue or they must fall back. Interestingly, the "migratoriness" of glass eels is something that can be identified through hormonal levels and behavior in the laboratory (du Columbier et al 2008;Imbert et al 2008), suggesting that eels could become a very important model species for the study of partial migration in fishes.…”

Section: Are Herring Creatures Of Habit?mentioning

confidence: 99%

Is otolith science transformative? New views on fish migration

Secor

2010

Environ Biol Fish

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“…In fish, thyroid metabolism plays a pivotal role in some development processes such as growth and Contents lists available at ScienceDirect journal homepage: www.elsevier.com/locate/envres maturation (Sower et al, 1985;Walpita et al, 2009), smoltification (Björnsson et al, 2011), osmoregulation (Peter, 2011) and larval metamorphosis (Klaren et al, 2008;Taillebois et al, 2011). Additionally, the thyroid system is involved in immune system development (Lam et al, 2005), regulation of the intermediate metabolism (Kao et al, 1999) and behavior patterns (Edeline et al, 2005;Imbert et al, 2008). Therefore, alterations in the thyroid metabolism may affect those processes, leading to physiological abnormalities and other adverse effects, which in turn may compromise the correct balance of populations and even species survival.…”

Section: Introductionmentioning

confidence: 99%