Seasonal Dynamics of Atlantic Herring (Clupea harengus L.) Populations Spawning in the Vicinity of Marginal Habitats
Eggers, Florian; Slotte, Aril; Libungan, Lisa Anne; Johannessen, Arne; Kvamme, Cecilie; Moland, Even; Olsen, Esben Moland; Nash, Richard D. M.
Journal article, Peer reviewed
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http://hdl.handle.net/11250/225801Utgivelsesdato
2014Metadata
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Originalversjon
Eggers, F., Slotte, A., Libungan, L. A., Johannessen, A., Kvamme, C., Moland, E., . . . Nash, R. D. (2014). Seasonal Dynamics of Atlantic Herring (Clupea harengus L.) Populations Spawning in the Vicinity of Marginal Habitats. PLoS One, 9(11), e111985. doi: 10.1371/journal.pone.0111985 10.1371/journal.pone.0111985Sammendrag
Gillnet sampling and analyses of otolith shape, vertebral count and growth indicated the presence of three putative Atlantic
herring (Clupea harengus L.) populations mixing together over the spawning season February–June inside and outside an
inland brackish water lake (Landvikvannet) in southern Norway. Peak spawning of oceanic Norwegian spring spawners and
coastal Skagerrak spring spawners occurred in March–April with small proportions of spawners entering the lake. In
comparison, spawning of Landvik herring peaked in May–June with high proportions found inside the lake, which could be
explained by local adaptations to the environmental conditions and seasonal changes of this marginal habitat. The 1.85 km2
lake was characterized by oxygen depletion occurring between 2.5 and 5 m depth between March and June. This was
followed by changes in salinity from 1–7%in the 0–1 m surface layer to levels of 20–25%deeper than 10 m. In comparison,
outside the 3 km long narrow channel connecting the lake with the neighboring fjord, no anoxic conditions were found.
Here salinity in the surface layer increased over the season from 10 to 25%, whereas deeper than 5 m it was stable at
around 35%. Temperature at 0–5 m depth increased significantly over the season in both habitats, from 7 to 14uC outsideand 5 to 17uC inside the lake. Despite differences in peak spawning and utilization of the lake habitat between the three putative populations, there was an apparent temporal and spatial overlap in spawning stages suggesting potential interbreeding in accordance with the metapopulation concept
Beskrivelse
Published version of an article from the journal PLoS One. Also available from the publisher: http://dx.doi.org/10.1371/journal.pone.0111985