A new element in the migration cycle of the European river lamprey Lampetra fluviatilis: downstream migration from a lake
In 2019, during spring flood, we collected unusual Lampetra fluviatilis smolts migrating from a small lake, as part of a multi-year survey in the Chernaya River (Gulf of Finland, Baltic Sea). They differed from the ordinary Lampetra fluviatilis individuals in some of the features, mainly size. The e...
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Veröffentlicht in: | Environmental biology of fishes 2022-12, Vol.105 (12), p.1857-1871 |
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Sprache: | eng |
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Zusammenfassung: | In 2019, during spring flood, we collected unusual
Lampetra fluviatilis
smolts migrating from a small lake, as part of a multi-year survey in the Chernaya River (Gulf of Finland, Baltic Sea). They differed from the ordinary
Lampetra fluviatilis
individuals in some of the features, mainly size. The emigration occurred at the darkest period of night and during extreme flooding, which significantly worsened the conditions in the Lake Gladyshevskoe and Chernaya River. In these individuals,
lacus
smolts, emigration occurred in the spring season with the migration of ordinary
flumen
specimens. Several hypotheses are discussed to explain the observation of large
lacus
(148–165 mm) individuals: they are seaward migrants, within expected body sizes of European river lamprey species but unusual for Gulf of Finland tributaries; the lake is a transitional habitat, and the postmetamorphic
lacus
juveniles migrating through it from a tributary; postmetamorphic
lacus
juveniles spend some time feeding in a lake but emigrated due to environmental conditions; larvae of European river lamprey, developing in the eutrophic lake, reach greater sizes than riverine larvae before transformation and subsequently produce larger juveniles. |
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ISSN: | 0378-1909 1573-5133 |
DOI: | 10.1007/s10641-022-01249-1 |