Variation of juvenile Atlantic salmon (<i>Salmo salar</i>) body composition along sedimentary links*

Johnston, Patricia; Bergeron, Normand

doi:10.1111/j.1600-0633.2009.00403.x

Cited by 3 publications

(1 citation statement)

References 43 publications

(145 reference statements)

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“…Finstad et al (2004) found that juvenile salmon with low energy content were less likely to survive winter, and these fish were also likely to have exhausted their TAG reserves. Habitat-specific differences in TAG accumulation in juvenile Atlantic salmon along a longitudinal gradient in a French river were reported by Descroix et al (2009), but no pattern was found in 2 Canadian rivers by Johnston and Bergeron (2010).…”

Section: Introductionmentioning

confidence: 82%

Seasonal and spatial variation in lipid and triacylglycerol levels in juvenile chinook salmon (Oncorhynchus tshawytscha) from the Bridge River, British Columbia

2012

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a b s t r a c tTriacylglycerols (TAGs) are the primary form of energy storage in fish, but little work has been done on the dynamics of TAG storage and use in relation to environmental conditions. We sampled age-0 chinook salmon (Oncorhynchus tshawytscha) in two reaches of a regulated river in British Columbia, Canada that had different discharge regimes. During the summer, fish from the reach with high freshet flows grew more slowly and had lower TAG levels than those from the reach with lower and more stable flows. In addition, smaller individuals had lower TAG levels than larger ones. We suggest that in the reach with higher flows fish were unable to obtain sufficient surplus energy for somatic growth and lipid storage. In the fall, when flows were lower, TAG storage increased and the proportion of total lipids that were TAGs were similar for both small and large fish. The allocation of energy to TAG stores was likely a strategy to ensure individuals had sufficient energy for overwintering. Our results suggest that individual-based variation in TAG levels may be sensitive to environmental factors and can be used as a measure of fish condition and performance, but more work is needed to fully understand lipid dynamics in seasonally and spatially variable rearing environments.Crown

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Section: Introductionmentioning

confidence: 82%

Seasonal and spatial variation in lipid and triacylglycerol levels in juvenile chinook salmon (Oncorhynchus tshawytscha) from the Bridge River, British Columbia

2012

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Mining candidate causal relationships in movement patterns

Bleisch¹,

Duckham²,

Galton³

et al. 2013

International Journal of Geographical Information Science

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In many applications, the environmental context for, and drivers of movement patterns are just as important as the patterns themselves. This paper adapts standard data mining techniques, combined with a foundational ontology of causation, with the objective of helping domain experts identify candidate causal relationships between movement patterns and their environmental context. In addition to data about movement and its dynamic environmental context, our approach requires as input definitions of the states and events of interest. The technique outputs causal and causal-like relationships of potential interest, along with associated measures of support and confidence. As a validation of our approach, the analysis is applied to real data about fish movement in the Murray River in Australia. The results demonstrate the technique is capable of identifying statistically significant patterns of movement indicative of causal and causal-like relationships.

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Individual variability in the movement behaviour of juvenile Atlantic salmon

Roy

Grant

et al. 2013

Can. J. Fish. Aquat. Sci.

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Stream-dwelling salmonid populations are generally thought to be composed of both relatively mobile and sedentary individuals, but this conclusion is primarily based on results obtained from recapture methods with low temporal resolution. In this study, the mobility of 50 juvenile Atlantic salmon (Salmo salar) was monitored using a large array of passive integrated transponder antennas buried in the bed of a natural stream. Fish locations were recorded at a high frequency for a period of 3 months in a 65 m reach. Four types of daily behaviour were identified: stationary (detected primarily at one location), sedentary (limited movement between a few locations), floater (frequent movements in a restricted home range), and wanderer (movements across the reach). Most individuals exhibited low mobility on most days, but also showed occasional bouts of high mobility. Between-individual variability accounted for only 12%–17% of the variability in the mobility data. High mobility was more frequent at low flow, but no difference was observed between the summer (12–18 °C) and the autumn (4–12 °C). Individual variation on a daily basis suggested that movement behaviour is a response to changing environmental conditions rather than an individual behavioural trait.

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Variation of juvenile Atlantic salmon (Salmo salar) body composition along sedimentary links*

Cited by 3 publications

References 43 publications

Seasonal and spatial variation in lipid and triacylglycerol levels in juvenile chinook salmon (Oncorhynchus tshawytscha) from the Bridge River, British Columbia

Seasonal and spatial variation in lipid and triacylglycerol levels in juvenile chinook salmon (Oncorhynchus tshawytscha) from the Bridge River, British Columbia

Mining candidate causal relationships in movement patterns

Individual variability in the movement behaviour of juvenile Atlantic salmon

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