Migration behaviour of twaite shad Alosa fallax in the river Elbe assessed by otolith Sr:Ca and Ba:Ca profiles.

Magath, V., Marohn, Lasse, Fietzke, Jan , Frische, Matthias, Thiel, R. and Dierking, Jan (2013) Migration behaviour of twaite shad Alosa fallax in the river Elbe assessed by otolith Sr:Ca and Ba:Ca profiles. Journal of Fish Biology, 82 (6). pp. 1871-1887. DOI 10.1111/jfb.12115.

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Abstract

Individual migration behaviour during the juvenile and adult life phase of the anadromous twaite shad Alosa fallax in the Elbe estuary was examined using otolith Sr:Ca and Ba:Ca profiles. Between hatching and the end of the first year of life, juveniles showed two migration patterns. Pattern one exhibited a single downstream migration from fresh water to the sea with no return into fresh water. In contrast, pattern two showed a first migration into the sea, then a return into fresh water and, finally, a second downstream migration into marine water. This first report of migration plasticity for A. fallax points to different exposure times to estuarine threats depending on the migration strategy. In adults, high Sr:Ca and low Ba:Ca in the majority of individuals confirmed prior reports of a primarily marine habitat use. Patterns reflecting spawning migrations were rarely observed on otoliths, possibly due to the short duration of visits to fresh water.

Document Type: Article
Additional Information: WOS:000319903100008
Keywords: anthropogenic impact; conservation; diadromous species; estuarine phase; intra-population plasticity; otolith microchemistry
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Marine Evolutionary Ecology
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1111/jfb.12115
ISSN: 0022-1112
Projects: ESTRADE, KLIMZUG-NORD
Date Deposited: 23 Apr 2013 13:33
Last Modified: 14 Sep 2017 11:39
URI: http://oceanrep.geomar.de/id/eprint/21145

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