scholarly journals Biological and environmental influences on the migration phenology of Atlantic salmon Salmo salar smolts in a chalk stream in southern England

2021 ◽  
Author(s):  
Olivia M. Simmons ◽  
Stephen D. Gregory ◽  
Phillipa K. Gillingham ◽  
William D. Riley ◽  
Luke J. Scott ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Environmental Influences ◽  
Southern England ◽  
Atlantic Salmon Salmo Salar ◽  
Migration Phenology ◽  
Chalk Stream

Warm winters and cool springs negatively influence recruitment of Atlantic salmon ( Salmo salar L.) in a southern England chalk stream

2021 ◽  
Author(s):  
Jessica E. Marsh ◽  
Rasmus B. Lauridsen ◽  
William D. Riley ◽  
Olivia M. Simmons ◽  
Céline Artero ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Southern England ◽  
Atlantic Salmon Salmo Salar ◽  
Chalk Stream

Development of schooling behaviour during the downstream migration of Atlantic salmon Salmo salar smolts in a chalk stream

2014 ◽  
Vol 85 (4) ◽  
pp. 1042-1059 ◽  
Author(s):  
W. D. Riley ◽  
A. T. Ibbotson ◽  
D. L. Maxwell ◽  
P. I. Davison ◽  
W. R. C. Beaumont ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Downstream Migration ◽  
Atlantic Salmon Salmo Salar ◽  
Schooling Behaviour ◽  
Chalk Stream

scholarly journals Influences of migration phenology on survival are size-dependent in juvenile Atlantic salmon (Salmo salar)

2017 ◽  
Vol 95 (8) ◽  
pp. 581-587 ◽  
Author(s):  
B. Jonsson ◽  
M. Jonsson ◽  
N. Jonsson
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Risk Environment ◽  
Migratory Species ◽  
Long Distance ◽  
Size Dependent ◽  
Atlantic Salmon Salmo Salar ◽  
Short Period ◽  
Migration Phenology ◽  
Migration Event

Long-distance migratory species can reduce mortality risks by synchronizing the migration event and create confusion by swamping predators with high densities. To reduce confusion, predators are known to primarily select aberrant prey. We hypothesized that at the start of their sea sojourn, particularly small and large Atlantic salmon (Salmo salar L., 1758) would spread the risk by also migrating at other times of the year. Based on data from the Norwegian river Imsa between 1976 and 2015, we found that juveniles, 14–19 cm in total length, started their sea sojourn during a short period between late April and early June. However, more than 20% of fish 13 cm or shorter migrated downstream between October and March, whereas 55% of fish 20 cm or longer migrated downstream between July and September. The regular-sized, spring-migrating juveniles had 2–3 times higher survival at sea than similar-sized conspecifics migrating to sea at other times of the year. The survival at sea for smaller juveniles was not improved by migration in spring relative to winter, and the survival of the largest juveniles was similar in spring and summer. Thus, the migration phenology appears adapted to survival in a high-risk environment by changing the timing according to their sizes.

scholarly journals Influence of environmental and biological factors on the overwinter growth rate of Atlantic salmon Salmo salar parr in a UK chalk stream

2020 ◽  
Vol 29 (4) ◽  
pp. 665-678
Author(s):  
Olivia M. Simmons ◽  
John Robert Britton ◽  
Phillipa K. Gillingham ◽  
Stephen D. Gregory
Keyword(s):  
Growth Rate ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Biological Factors ◽  
Atlantic Salmon Salmo Salar ◽  
Chalk Stream

scholarly journals The effects of flow on Atlantic salmon (Salmo salar ) redd distribution in a UK chalk stream between 1980 and 2015

2017 ◽  
Vol 27 (1) ◽  
pp. 128-137 ◽  
Author(s):  
Elinor S. Parry ◽  
Stephen D. Gregory ◽  
Rasmus B. Lauridsen ◽  
Siân W. Griffiths
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Atlantic Salmon Salmo Salar ◽  
Chalk Stream
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