Diel vertical migration in Pacific sand lance (<i>Ammodytes personatus</i>)—a pelagic forage fish associated with benthic substrates

Baker, Matthew R.; Smeltz, T. Scott; Williams, Kresimir; Greufe, Casey; Ewing, Mike; Chapman, Jonathan; Glassy, Joseph M.; Hasegawa, Eiichi; Cieri, Kathleen P; Matson, Sean E.; Towler, Rick

doi:10.1093/icesjms/fsad106

Cited by 5 publications

(2 citation statements)

References 76 publications

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“…For example, diel vertical movements by sand lance and the segregation of age‐0 fish versus older age‐classes in the pelagic feeding phase may affect the observability of portions of the population depending on the time of day (Baker et al. 2023).…”

Section: Discussionmentioning

confidence: 99%

“…In addition, a better understanding of the sources of variability in sand lance availability to detection by surveys and/or predators will provide context regarding population trends and distribution over time. For example, diel vertical movements by sand lance and the segregation of age-0 fish versus older age-classes in the pelagic feeding phase may affect the observability of portions of the population depending on the time of day (Baker et al 2023).…”

Section: Pacific Sand Lancementioning

confidence: 99%

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Quantifying spatiotemporal variation of nearshore forage fish schools with aerial surveys in Prince William Sound, Alaska

Donnelly,

Arimitsu,

Pegau

et al. 2024

Mar Coast Fish

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ObjectiveChanges in abundance and distribution of schooling forage fish, such as the Pacific Sand Lance Ammodytes hexapterus and Pacific Herring Clupea pallasii, can be difficult to document using traditional boat‐based methods, especially in the shallow, nearshore habitats frequented by these species. In contrast, nearshore fish schools are easily observed and quantified from aircraft when light and sea conditions are favorable. We used aerial shoreline surveys to assess interannual variability in the distribution and abundance of schooling forage fish in Prince William Sound, Alaska, during the summers of 2010 and 2012–2022.MethodsDuring the surveys, aerial observers classified fish schools by their size, species, and (in some cases) age‐class. All observations were georeferenced along the flight path, converted to estimated surface area (m2) based on school diameter, and standardized by effort (shoreline kilometers surveyed).ResultPacific Herring were widely distributed, and school densities varied annually; there were several spikes in school density of up to 54.38 m2/km interspersed among years of lower average densities (7.73–25.57 m2/km). In contrast, Pacific Sand Lance were usually limited in their distribution to a few predictable locations. School density in these consistent areas varied across years, from a high of 50.98 m2/km in 2010 to a low of 0.15 m2/km in 2017. We validated 88 schools during aerial surveys conducted in 2014–2016 and 2019–2022, of which 76 (86%) were correctly identified to species.ConclusionHere, we provide indices of Pacific Herring and Pacific Sand Lance school density over time in shallow nearshore coastal areas of Prince William Sound, Alaska. These indices were generated from aerial surveys, which offer an effective alternative to boat‐based surveys for tracking forage fish schools when they occur in shallow and nearshore coastal habitats.

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Section: Discussionmentioning

confidence: 99%

Section: Pacific Sand Lancementioning

confidence: 99%

Quantifying spatiotemporal variation of nearshore forage fish schools with aerial surveys in Prince William Sound, Alaska

Donnelly,

Arimitsu,

Pegau

et al. 2024

Mar Coast Fish

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Leptin gene expression in the brain is associated with the physiological onset of estivation in western sand lance Ammodytes japonicus

Amiya,

Nakano,

Tanaka

et al. 2024

J Exp Zool Pt A

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Dormancy is an essential ecological characteristic for the survival of organisms that experience harsh environments. Although factors that initiate dormancy vary, suppression or cessation of feeding activities are common among taxa. To distinguish between extrinsic and intrinsic causes of metabolic reduction, we focused on estivation, which occurs in summer when the feeding activity is generally enhanced. Sand lances (genus Ammodytes) are a unique marine fish with a long estivation period from early summer to late autumn. In the present study, we aimed to elucidate the control mechanisms of estivation in western sand lance (A. japonicus), and firstly examined behavioral changes in 8 months including a transition between active and dormant phases. We found that swimming/feeding behavior gradually decreased from June, and completely disappeared by late August, indicating all individuals had entered estivation. Next, we focused on leptin, known as a feeding suppression hormone in various organisms, and examined leptin‐A gene (AjLepA) expression in the brain that may regulate the seasonal behavioral pattern. AjLepA expression decreased after 7 days of fasting, suggesting that leptin has a function to regulate feeding in this species. The monthly expression dynamics of AjLepA during the feeding (active) and non‐feeding (estivation) periods showed that the levels gradually increased with the onset of estivation and reached its peak when all the experimental fish had estivated. The present study suggests that the suppression of feeding activity by leptin causes shift in the physiological modes of A. japonicus before estivation.

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Effects of sediment type and light availability on the burying behaviour of small sandeel (Ammodytes tobianus)

Henriksen,

Moran,

Veilex

et al. 2024

Journal of Experimental Marine Biology and Ecology

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Diel vertical migration in Pacific sand lance (Ammodytes personatus)—a pelagic forage fish associated with benthic substrates

Cited by 5 publications

References 76 publications

Quantifying spatiotemporal variation of nearshore forage fish schools with aerial surveys in Prince William Sound, Alaska

Quantifying spatiotemporal variation of nearshore forage fish schools with aerial surveys in Prince William Sound, Alaska

Leptin gene expression in the brain is associated with the physiological onset of estivation in western sand lance Ammodytes japonicus

Effects of sediment type and light availability on the burying behaviour of small sandeel (Ammodytes tobianus)

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