Population genetic structure after 125 years of stocking in sea trout (Salmo trutta L.)

Christoph Petereit*, Dorte Bekkevold, Sascha Nickel, Jan Dierking, Harry Hantke, Albrecht Hahn, Thorsten Reusch, Oscar Puebla

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Stocking can be an effective management and conservation tool, but it also carries the danger of eroding natural population structure, introducing non-native strains and reducing genetic diversity. Sea trout, the anadromous form of the brown trout (Salmo trutta), is a highly targeted species that is often managed by stocking. Here, we assess the present-day population genetic structure of sea trout in a backdrop of 125 years of stocking in Northern Germany. The study area is characterized by short distances between the Baltic and North Sea river watersheds, historic use of fish from both watersheds for stocking, and the creation of a potential migration corridor between the Baltic and North Sea with the opening of the Kiel Canal 120 years ago. A survey of 24 river systems with 180 SNPs indicates that moderate but highly significant population genetic structure has persisted both within and between the Baltic and North Sea. This genetic structure is characterized by (i) heterogeneous patterns of admixture between the Baltic and North Sea that do not correlate with distance from the Kiel Canal and are therefore likely due to historic stocking practises, (ii) genetic isolation by distance in the Baltic Sea at a spatial scale of < 200 km that is consistent with the homing behaviour of sea trout, and (iii) at least one genetically distinct Baltic Sea river system. In light of these results, we recommend keeping fish of North Sea and Baltic Sea origin separate for stocking, and restricting Baltic Sea translocations to neighbouring river systems.

Original languageEnglish
JournalConservation Genetics
Volume19
Issue number5
Pages (from-to)1123-1136
ISSN1566-0621
DOIs
Publication statusPublished - 20 Jun 2018

Keywords

  • Baltic Sea
  • Kiel Canal
  • Population genetics
  • Sea trout
  • SNPs
  • Stocking

Cite this

Petereit, Christoph ; Bekkevold, Dorte ; Nickel, Sascha ; Dierking, Jan ; Hantke, Harry ; Hahn, Albrecht ; Reusch, Thorsten ; Puebla, Oscar. / Population genetic structure after 125 years of stocking in sea trout (Salmo trutta L.). In: Conservation Genetics. 2018 ; Vol. 19, No. 5. pp. 1123-1136.
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title = "Population genetic structure after 125 years of stocking in sea trout (Salmo trutta L.)",
abstract = "Stocking can be an effective management and conservation tool, but it also carries the danger of eroding natural population structure, introducing non-native strains and reducing genetic diversity. Sea trout, the anadromous form of the brown trout (Salmo trutta), is a highly targeted species that is often managed by stocking. Here, we assess the present-day population genetic structure of sea trout in a backdrop of 125 years of stocking in Northern Germany. The study area is characterized by short distances between the Baltic and North Sea river watersheds, historic use of fish from both watersheds for stocking, and the creation of a potential migration corridor between the Baltic and North Sea with the opening of the Kiel Canal 120 years ago. A survey of 24 river systems with 180 SNPs indicates that moderate but highly significant population genetic structure has persisted both within and between the Baltic and North Sea. This genetic structure is characterized by (i) heterogeneous patterns of admixture between the Baltic and North Sea that do not correlate with distance from the Kiel Canal and are therefore likely due to historic stocking practises, (ii) genetic isolation by distance in the Baltic Sea at a spatial scale of < 200 km that is consistent with the homing behaviour of sea trout, and (iii) at least one genetically distinct Baltic Sea river system. In light of these results, we recommend keeping fish of North Sea and Baltic Sea origin separate for stocking, and restricting Baltic Sea translocations to neighbouring river systems.",
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Petereit, C, Bekkevold, D, Nickel, S, Dierking, J, Hantke, H, Hahn, A, Reusch, T & Puebla, O 2018, 'Population genetic structure after 125 years of stocking in sea trout (Salmo trutta L.)', Conservation Genetics, vol. 19, no. 5, pp. 1123-1136. https://doi.org/10.1007/s10592-018-1083-6

Population genetic structure after 125 years of stocking in sea trout (Salmo trutta L.). / Petereit, Christoph; Bekkevold, Dorte; Nickel, Sascha; Dierking, Jan; Hantke, Harry; Hahn, Albrecht; Reusch, Thorsten; Puebla, Oscar.

In: Conservation Genetics, Vol. 19, No. 5, 20.06.2018, p. 1123-1136.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Population genetic structure after 125 years of stocking in sea trout (Salmo trutta L.)

AU - Petereit, Christoph

AU - Bekkevold, Dorte

AU - Nickel, Sascha

AU - Dierking, Jan

AU - Hantke, Harry

AU - Hahn, Albrecht

AU - Reusch, Thorsten

AU - Puebla, Oscar

PY - 2018/6/20

Y1 - 2018/6/20

N2 - Stocking can be an effective management and conservation tool, but it also carries the danger of eroding natural population structure, introducing non-native strains and reducing genetic diversity. Sea trout, the anadromous form of the brown trout (Salmo trutta), is a highly targeted species that is often managed by stocking. Here, we assess the present-day population genetic structure of sea trout in a backdrop of 125 years of stocking in Northern Germany. The study area is characterized by short distances between the Baltic and North Sea river watersheds, historic use of fish from both watersheds for stocking, and the creation of a potential migration corridor between the Baltic and North Sea with the opening of the Kiel Canal 120 years ago. A survey of 24 river systems with 180 SNPs indicates that moderate but highly significant population genetic structure has persisted both within and between the Baltic and North Sea. This genetic structure is characterized by (i) heterogeneous patterns of admixture between the Baltic and North Sea that do not correlate with distance from the Kiel Canal and are therefore likely due to historic stocking practises, (ii) genetic isolation by distance in the Baltic Sea at a spatial scale of < 200 km that is consistent with the homing behaviour of sea trout, and (iii) at least one genetically distinct Baltic Sea river system. In light of these results, we recommend keeping fish of North Sea and Baltic Sea origin separate for stocking, and restricting Baltic Sea translocations to neighbouring river systems.

AB - Stocking can be an effective management and conservation tool, but it also carries the danger of eroding natural population structure, introducing non-native strains and reducing genetic diversity. Sea trout, the anadromous form of the brown trout (Salmo trutta), is a highly targeted species that is often managed by stocking. Here, we assess the present-day population genetic structure of sea trout in a backdrop of 125 years of stocking in Northern Germany. The study area is characterized by short distances between the Baltic and North Sea river watersheds, historic use of fish from both watersheds for stocking, and the creation of a potential migration corridor between the Baltic and North Sea with the opening of the Kiel Canal 120 years ago. A survey of 24 river systems with 180 SNPs indicates that moderate but highly significant population genetic structure has persisted both within and between the Baltic and North Sea. This genetic structure is characterized by (i) heterogeneous patterns of admixture between the Baltic and North Sea that do not correlate with distance from the Kiel Canal and are therefore likely due to historic stocking practises, (ii) genetic isolation by distance in the Baltic Sea at a spatial scale of < 200 km that is consistent with the homing behaviour of sea trout, and (iii) at least one genetically distinct Baltic Sea river system. In light of these results, we recommend keeping fish of North Sea and Baltic Sea origin separate for stocking, and restricting Baltic Sea translocations to neighbouring river systems.

KW - Baltic Sea

KW - Kiel Canal

KW - Population genetics

KW - Sea trout

KW - SNPs

KW - Stocking

U2 - 10.1007/s10592-018-1083-6

DO - 10.1007/s10592-018-1083-6

M3 - Journal article

AN - SCOPUS:85048773547

VL - 19

SP - 1123

EP - 1136

JO - Conservation Genetics

JF - Conservation Genetics

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ER -