Predicting the nationwide outmigration timing of Atlantic salmon (<i>Salmo salar</i>) smolts along 12 degrees of latitude in Norway

Vollset, Knut Wiik; Lennox, Robert J.; Lamberg, Anders; Skaala, Øystein; Sandvik, Anne Dagrun; Sægrov, Harald; Kvingedal, Eli; Kristensen, Torstein; Jensen, Arne Johan; Haraldstad, Tormod; Barlaup, Bjørn Torgeir; Ugedal, Ola

doi:10.1111/ddi.13285

Cited by 13 publications

(22 citation statements)

References 30 publications

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“…Putative monthly growth estimates indicate that growth is limited from November, and we therefore calculate growth from day of out-migration to 31 October. Day of out-migration was calculated according to ( 55 ) using a model that explains out-migration date based on latitude, longitude, air temperature during winter, and river discharge. The estimated growth is called relative growth per day.…”

Section: Methodsmentioning

confidence: 99%

Ecological regime shift in the Northeast Atlantic Ocean revealed from the unprecedented reduction in marine growth of Atlantic salmon

Vollset

Urdal²,

Utne

et al. 2022

Sci. Adv.

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Ecological regime shifts are abrupt changes in the structure and function of ecosystems that persist over time, but evidence of contemporary regime shifts are rare. Historical scale data from 52,384 individual wild Atlantic salmon caught in 180 rivers from 1989 to 2017 reveal that growth of Atlantic salmon across the Northeast Atlantic Ocean abruptly decreased following the year 2004. At the same time, the proportion of early maturing Atlantic salmon decreased. These changes occurred after a marked decrease in the extent of Arctic water in the Norwegian Sea, a subsequent warming of spring water temperature before Atlantic salmon entering the sea, and an approximately 50% reduction of zooplankton across large geographic areas of the Northeast Atlantic Ocean. A sudden decrease in growth was also observed among Atlantic mackerel in the Norwegian Sea. Our results point toward an ecosystem-scale regime shift in the Northeast Atlantic Ocean.

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Section: Methodsmentioning

confidence: 99%

Ecological regime shift in the Northeast Atlantic Ocean revealed from the unprecedented reduction in marine growth of Atlantic salmon

Vollset

Urdal²,

Utne

et al. 2022

Sci. Adv.

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“…Fundamental aspects of resource exploitation, competition with con‐ and hetero‐specifics, predation and disease risk, energy budgeting and vulnerability to stressors all stem from having a grasp of how and why fish move. Fish movement is predictable with models trained by movement data ( e.g ., Brownscombe et al ., 2020; Vollset et al ., 2021) and can contribute to spatial planning (Lennox et al ., 2019a), either by predicting when fish are present/absent or using automated detection systems to inform agile decision making such as shutting down hydropower plants as migrating fish begin to arrive (Teichert et al ., 2020). Many of the models used for assessing the movement propagation process have been adapted from terrestrial systems where depth is immaterial, so our concepts of how to effectively include the third dimension remains somewhat limited (but see Lee et al ., 2017 for discussion).…”

Section: The Individualmentioning

confidence: 99%

The movement ecology of fishes

Cooke

Bergman

Twardek

et al. 2022

Journal of Fish Biology

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Movement of fishes in the aquatic realm is fundamental to their ecology and survival. Movement can be driven by a variety of biological, physiological and environmental factors occurring across all spatial and temporal scales. The intrinsic capacity of movement to impact fish individually (e.g., foraging) with potential knock‐on effects throughout the ecosystem (e.g., food web dynamics) has garnered considerable interest in the field of movement ecology. The advancement of technology in recent decades, in combination with ever‐growing threats to freshwater and marine systems, has further spurred empirical research and theoretical considerations. Given the rapid expansion within the field of movement ecology and its significant role in informing management and conservation efforts, a contemporary and multidisciplinary review about the various components influencing movement is outstanding. Using an established conceptual framework for movement ecology as a guide (i.e., Nathan et al., 2008: 19052), we synthesized the environmental and individual factors that affect the movement of fishes. Specifically, internal (e.g., energy acquisition, endocrinology, and homeostasis) and external (biotic and abiotic) environmental elements are discussed, as well as the different processes that influence individual‐level (or population) decisions, such as navigation cues, motion capacity, propagation characteristics and group behaviours. In addition to environmental drivers and individual movement factors, we also explored how associated strategies help survival by optimizing physiological and other biological states. Next, we identified how movement ecology is increasingly being incorporated into management and conservation by highlighting the inherent benefits that spatio‐temporal fish behaviour imbues into policy, regulatory, and remediation planning. Finally, we considered the future of movement ecology by evaluating ongoing technological innovations and both the challenges and opportunities that these advancements create for scientists and managers. As aquatic ecosystems continue to face alarming climate (and other human‐driven) issues that impact animal movements, the comprehensive and multidisciplinary assessment of movement ecology will be instrumental in developing plans to guide research and promote sustainability measures for aquatic resources.

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“…The modelling results of Vollset et al . (2021) reflect this observation, in which studies estimating the outmigration timing of smolts were found to estimate earlier overall outmigration timing than studies using video or trap methods that are not size selective in the way that tagging is. When using electronic tagging to estimate the timing of smolt migrations, the smallest possible tags should be used so that the full range of the smolt size distribution can be tagged and monitored through the season.…”

Section: Discussionmentioning

confidence: 81%

Effects of tag type and surgery on migration of Atlantic salmon (Salmo salar) smolts

Lennox

Stöger

Dahlmo

et al. 2022

Journal of Fish Biology

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Predicting the nationwide outmigration timing of Atlantic salmon (Salmo salar) smolts along 12 degrees of latitude in Norway

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 13 publications

References 30 publications

Ecological regime shift in the Northeast Atlantic Ocean revealed from the unprecedented reduction in marine growth of Atlantic salmon

Ecological regime shift in the Northeast Atlantic Ocean revealed from the unprecedented reduction in marine growth of Atlantic salmon

The movement ecology of fishes

Effects of tag type and surgery on migration of Atlantic salmon (Salmo salar) smolts

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