Abstract
| Original language | English |
|---|---|
| Article number | 13468 |
| Journal | Scientific Reports |
| Volume | 9 |
| ISSN | 2045-2322 |
| DOIs | |
| Publication status | Published - 2019 |
Keywords
- Animal migration
- Behavioural ecology
Cite this
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The influence of initial developmental status on the life-history of sea trout (Salmo trutta). / Del Villar-Guerra, Diego; Larsen, Martin H; Baktoft, Henrik; Koed, Anders; Aarestrup, Kim.
In: Scientific Reports, Vol. 9, 13468, 2019.Research output: Contribution to journal › Journal article › Research › peer-review
TY - JOUR
T1 - The influence of initial developmental status on the life-history of sea trout (Salmo trutta)
AU - Del Villar-Guerra, Diego
AU - Larsen, Martin H
AU - Baktoft, Henrik
AU - Koed, Anders
AU - Aarestrup, Kim
PY - 2019
Y1 - 2019
N2 - Spring migrating sea trout juveniles can be classified as parr, pre-smolt or smolt based on body morphology and osmoregulatory capacity. In this respect, parr are assumed to be less prepared for a marine life and to have lower survival at sea than pre-smolts and smolts. However, the behaviour and survival of these trout phenotypes upon entering the sea is not well known. Using passive integrated transponder telemetry, this study found that the return rate from the sea to the natal river was higher for parr compared to pre-smolts and smolts. Additionally, trout classified as parr generally migrated earlier to the sea and a larger proportion returned to the river after less than one year at sea. The daily mortality rate at sea was comparable among the different phenotypes of trout, suggesting that the higher proportion of returning parr to the river was linked to their shorter duration at sea. These results provide evidence of different life-history strategies for seaward-migrating juvenile sea trout, ultimately affecting their return rate to the natal river. Investigations failing to consider downstream migrating parr and pre-smolts risks neglecting a large part of the anadromous population and may result in inaccurate assessments of sea trout stocks in rivers.
AB - Spring migrating sea trout juveniles can be classified as parr, pre-smolt or smolt based on body morphology and osmoregulatory capacity. In this respect, parr are assumed to be less prepared for a marine life and to have lower survival at sea than pre-smolts and smolts. However, the behaviour and survival of these trout phenotypes upon entering the sea is not well known. Using passive integrated transponder telemetry, this study found that the return rate from the sea to the natal river was higher for parr compared to pre-smolts and smolts. Additionally, trout classified as parr generally migrated earlier to the sea and a larger proportion returned to the river after less than one year at sea. The daily mortality rate at sea was comparable among the different phenotypes of trout, suggesting that the higher proportion of returning parr to the river was linked to their shorter duration at sea. These results provide evidence of different life-history strategies for seaward-migrating juvenile sea trout, ultimately affecting their return rate to the natal river. Investigations failing to consider downstream migrating parr and pre-smolts risks neglecting a large part of the anadromous population and may result in inaccurate assessments of sea trout stocks in rivers.
KW - Animal migration
KW - Behavioural ecology
U2 - 10.1038/s41598-019-49175-0
DO - 10.1038/s41598-019-49175-0
M3 - Journal article
VL - 9
JO - Scientific Reports
JF - Scientific Reports
SN - 2045-2322
M1 - 13468
ER -