Estuarine phase during seaward migration for allis shad Alosa alosa and twaite shad Alosa fallax future spawners
Identifieur interne : 000978 ( Main/Merge ); précédent : 000977; suivant : 000979Estuarine phase during seaward migration for allis shad Alosa alosa and twaite shad Alosa fallax future spawners
Auteurs : A. Lochet ; S. Boutry [France] ; E. RochardSource :
- Ecology of Freshwater Fish [ 0906-6691 ] ; 2009-06.
English descriptors
Abstract
Abstract – The timing and duration of the estuarine phase during seaward migration were addressed for allis shad and twaite shad, closely related sympatric species in the Gironde system. Otolith Sr:Ca and daily growth increments were used to retrospectively estimate the age at entrance in the estuary, the time spent in estuary and the age at seaward exit from returning adults. The two species exhibited different seaward migration strategies: allis shad entered the estuary at an older age than twaite shad (88 days vs. 59 days), stayed shorter in the estuary (11 days vs. 17 days) and exited to the sea at an older age (99 days vs. 77 days). In the Gironde system, the estuarine phase is very short and occurs within a particular time ‘window’ for the juveniles that will become future spawners. In this context, it might be suggested that the estuarine phase is a bottleneck for these sympatric shad populations.
Url:
DOI: 10.1111/j.1600-0633.2008.00350.x
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<front><div type="abstract">Abstract – The timing and duration of the estuarine phase during seaward migration were addressed for allis shad and twaite shad, closely related sympatric species in the Gironde system. Otolith Sr:Ca and daily growth increments were used to retrospectively estimate the age at entrance in the estuary, the time spent in estuary and the age at seaward exit from returning adults. The two species exhibited different seaward migration strategies: allis shad entered the estuary at an older age than twaite shad (88 days vs. 59 days), stayed shorter in the estuary (11 days vs. 17 days) and exited to the sea at an older age (99 days vs. 77 days). In the Gironde system, the estuarine phase is very short and occurs within a particular time ‘window’ for the juveniles that will become future spawners. In this context, it might be suggested that the estuarine phase is a bottleneck for these sympatric shad populations.</div>
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