Variation in plasma levels of insulin-like growth factor-I (IGF-I) in lingcod: relationships among season, size, and gonadal steroids

Beaudreau, Anne H.; Andrews, Kelly S.; Larsen, Donald A.; Young, Graham; Beckman, Brian R.

doi:10.1007/s00227-010-1571-9

Cited by 10 publications

(8 citation statements)

References 47 publications

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“…These salmon studies only examined juvenile fish; in contrast, the lingcod examined in this study included both juvenile and adult fish. Several fieldwork studies have shown that factors related to season, size of individual, and stage of maturity (Onuma et al 2010;Beaudreau et al 2011) explain some of the variation in IGF1 in wild fish. Further work to determine how lingcod IGF1 levels vary with these factors may be necessary to judge when it is appropriate to directly compare IGF1 values between groups of fish in the field to infer differences in growth rate (i.e., Can males and females or individuals in different stages of maturity be considered together?…”

Section: Discussionmentioning

confidence: 99%

“…The IGF1 level was the dependent variable, site nested within status and TL × site(status) were random effects, and status, TL, CPUE, status × TL, status × CPUE, and TL × CPUE were fixed effects. The TL was included in the model to account for potential correlations between IGF1 and fish length as observed in lingcod by Beaudreau et al (2011). Interaction terms were iteratively removed from the model if P > 0.25 (Underwood 1997).…”

Section: Spatial Patterns Of Igf1 and Traditional Biological Metricsmentioning

confidence: 99%

“…Moreover, IGF1 is positively correlated with the proportion of nonempty stomachs in lingcod (Beaudreau et al 2011).…”

mentioning

confidence: 95%

“…The relationship between IGF1 levels and rates of body growth has not been directly tested in the field, but there is supporting evidence for a positive relationship between IGF1 and rates of body growth in wild fish populations. For example, IGF1 levels in lingcod Ophiodon elongatus are lowest in winter when growth is expected to be lowest because temperatures are coldest and food supply is lowest (Beaudreau et al 2011).…”

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confidence: 99%

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Suitability of Insulin‐Like Growth Factor 1 (IGF1) as a Measure of Relative Growth Rates in Lingcod

et al. 2011

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The effectiveness of spatial management strategies is typically evaluated through traditional biological measurements of size, density, biomass, and the diversity of species inside and outside management boundaries. However, there have been relatively few attempts to evaluate the processes underlying these biological patterns. In this study, we take the first step toward developing a relative index of body growth for lingcod Ophiodon elongatus using plasma insulin‐like growth factor 1 (IGF1) with the ultimate goal of measuring spatial differences in relative growth rates. Insulin‐like growth factor 1 is one of the principal hormones that stimulates growth at the cellular level in all vertebrates and shows significant relationships with body growth in many fishes. In the laboratory, we found that the level of IGF1 was related to the instantaneous growth of juvenile lingcod. In the field, we measured size, condition, and plasma IGF1 level in 149 lingcod from eight locations inside and outside marine protected areas in the San Juan Islands, Washington. The IGF1 levels in wild lingcod were highly variable from site to site for both genders, and we were able to detect differences in IGF1 across space in males. Multivariate analyses showed that the spatial patterns of IGF1 differed from those of traditional biological measurements. More work is needed to validate the relationship between IGF1 and growth in larger individuals, but our research shows the potential for IGF1 to be used as an ecological indicator.

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Section: Discussionmentioning

confidence: 99%

Section: Spatial Patterns Of Igf1 and Traditional Biological Metricsmentioning

confidence: 99%

“…Moreover, IGF1 is positively correlated with the proportion of nonempty stomachs in lingcod (Beaudreau et al 2011).…”

mentioning

confidence: 95%

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confidence: 99%

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Suitability of Insulin‐Like Growth Factor 1 (IGF1) as a Measure of Relative Growth Rates in Lingcod

et al. 2011

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“…More recently, researchers have used IGF-1 levels to compare growth rates in fishes, and in particular salmonids, across a variety of conditions (e.g., temporal/seasonal, physical etc. (Beckman, Larsen, Lee-Pawlak, & Dickhoff, 1998;Beckman, Fairgrieve, Cooper, Mahnken, & Beamish, 2004;Larsen, Beckman, & Cooper, 2010;Stefansson et al, 2012) and as a function of individual size (Beaudreau, Andrews, Larsen, Young, & Beckman, 2011).…”

Section: Sample Processingmentioning

confidence: 99%

How relative size and abundance structures the relationship between size and individual growth in an ontogenetically piscivorous fish

Chamberlin

Beckman

Greene

et al. 2017

Ecology and Evolution

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While individual growth ultimately reflects the quality and quantity of food resources, intra and interspecific interactions for these resources, as well as individual size, may have dramatic impacts on growth opportunity. Out‐migrating anadromous salmonids make rapid transitions between habitat types resulting in large pulses of individuals into a given location over a short period, which may have significant impact on demand for local resources. We evaluated the spatial and temporal variation in IGF‐1 concentrations (a proxy for growth rate) and the relationship between size and concentration for juvenile Chinook salmon in Puget Sound, WA, USA, as a function of the relative size and abundance of both Chinook salmon and Pacific herring, a species which commonly co‐occurs with salmonids in nearshore marine habitats. The abundance of Chinook salmon and Pacific herring varied substantially among the sub‐basins as function of outmigration timing and spawn timing, respectively, while size varied systematically and consistently for both species. Mean IGF‐1 concentrations were different among sub‐basins, although patterns were not consistent through time. In general, size was positively correlated with IGF‐1 concentration, although the slope of the relationship was considerably higher where Pacific herring were more abundant than Chinook salmon; specifically where smaller individual herring, relative to Chinook salmon, were more abundant. Where Pacific herring were less abundant than Chinook salmon, IGF‐1 concentrations among small and large Chinook salmon were more variable and showed no consistent increase for larger individuals. The noticeable positive effect of relative Pacific herring abundance on the relationship between size and individual growth rates likely represents a shift to predation based on increased IGF‐1 concentrations for individual Chinook salmon that are large enough to incorporate fish into their diet and co‐occur with the highest abundances of Pacific herring.

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Reproduction and Spawning

Wright

Rowe

2018

Atlantic Cod

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Variation in plasma levels of insulin-like growth factor-I (IGF-I) in lingcod: relationships among season, size, and gonadal steroids

Cited by 10 publications

References 47 publications

Suitability of Insulin‐Like Growth Factor 1 (IGF1) as a Measure of Relative Growth Rates in Lingcod

Suitability of Insulin‐Like Growth Factor 1 (IGF1) as a Measure of Relative Growth Rates in Lingcod

How relative size and abundance structures the relationship between size and individual growth in an ontogenetically piscivorous fish

Reproduction and Spawning

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