A bioenergetics approach to modeling seasonal patterns in the bioaccumulation of radiocesium

Rowan, David J.; Rasmussen, Joseph B.; Chant, L.A.

doi:10.1016/s0166-1116(09)70117-7

Cited by 9 publications

(8 citation statements)

References 8 publications

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“…Numerous investigations have demonstrated that increasing water temperatures result in decreasing 137 Cs levels [7,23–26] via the influence of temperature on metabolism. Rowan et al [23] developed a bioenergetics model to explain the seasonality of 137 Cs levels in fish using their own data for rock bass ( Ambloplites rupestris ) and data for bluegills reported by Kolehmainen [6]. This model indicated that temperature was the most important factor determining the seasonality of 137 Cs levels in these two species, primarily because the effects of increased temperature on metabolism results in increased rates of 137 Cs elimination.…”

Section: Discussionmentioning

confidence: 99%

Seasonal variation in radiocesium levels of largemouth bass (Micropterus salmoides): Implications for humans and sensitive wildlife species

Peles

Philippi

Smith

et al. 2000

Enviro Toxic and Chemistry

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To examine seasonal variation in levels of radiocesium ( 137 Cs) within largemouth bass (Micropterus salmoides; N ϭ 589), fish were collected monthly over a one-year period from an abandoned reactor cooling reservoir. Month of collection, sex, age, and body mass (log transformed) were all significant factors influencing 137 Cs concentrations. Levels of 137 Cs reached a peak in late winter/early spring (February/March), and minimum values occurred in the fall (October). An asymmetric sawtooth model with a four-month period of increase and an eight-month period of decrease fit the data for monthly 137 Cs values significantly better than symmetric sinusoidal and sawtooth models. The mean concentration of 137 Cs for bass collected during all months was 7.09 Bq/g wet mass. All individuals examined, regardless of month, sex, age, or body mass, had 137 Cs levels (2.95-12.60 Bq/g) that were much higher than the maximum level (0.60 Bq/g wet mass) generally considered safe for human consumption. Radiocesium is relatively long-lived within this reservoir and will continue to remain an important issue in risk assessments for both humans and wildlife species.

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Section: Discussionmentioning

confidence: 99%

Seasonal variation in radiocesium levels of largemouth bass (Micropterus salmoides): Implications for humans and sensitive wildlife species

Peles

Philippi

Smith

et al. 2000

Enviro Toxic and Chemistry

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“…In Indian Pond, mean length was 22.4 cm (SD = 2.1 cm) for dwarf and 33.0 cm (SD = 5.8 cm) for normal whitefish, respectively. Since metabolic rate has been reported to differ between juvenile and adult fish (Rowan et al . 1997), only adult fish were sampled.…”

Section: Collectionmentioning

confidence: 99%

Parallelism in gene transcription among sympatric lake whitefish (Coregonus clupeaformisMitchill) ecotypes

2006

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We tested the hypothesis that phenotypic parallelism between dwarf and normal whitefish ecotypes (Coregonus clupeaformis, Salmonidae) is accompanied by parallelism in gene transcription. The most striking phenotypic differences between these forms implied energetic metabolism and swimming activity. Therefore, we predicted that genes showing parallel expression should mainly belong to functional groups associated with these phenotypes. Transcriptome profiles were obtained from white muscle by using a 3557 cDNA gene microarray developed for the Atlantic salmon (Salmo salar). A total of 1181 genes expressed in both lake populations hybridized on the array. Significant differential expression between ecotypes was detected for 134 (11.3%) and 195 (16.5%) gene clones in Cliff Lake and Indian Pond, respectively. Fifty-one genes (4.3%) showed parallel differential expression between lakes, among which 35 were expressed in opposite directions. Sixteen genes (1.35%) showed true parallelism of transcription, which mainly belonged to energetic metabolism and regulation of muscle contraction functional groups. Variance in expression was significantly reduced for these genes compared to those not showing directionality in parallelism of expression. Candidate genes associated with parallelism in swimming activity and energetic metabolism based on their level and variance in expression were identified. These results add to the growing evidence that parallel phenotypic evolution also involves parallelism at both the genotypic and regulatory level, which may at least partly be associated with genetic constraints. It also provides further evidence for the determinant role of divergent natural selection in driving phenotypic divergence, and perhaps reproductive isolation, in the adaptive radiation of lake whitefish. This study adds to a nascent field employing microarrays as powerful tools for investigating the evolutionary processes of adaptive divergence among natural populations.

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“…The model (eq. 3) was integrated over 1 year assuming water temperature to follow a sin function similar to that published for another north temperate water body (Rowan et al 1997). Thus, both growth and consumption rates represent the annual mean.…”

Section: Bioenergetic Analysismentioning

confidence: 99%

Bioenergetic costs of heavy metal exposure in yellow perch (Perca flavescens): in situ estimates with a radiotracer (¹³⁷Cs) technique

Sherwood¹,

Rasmussen²,

Rowan³

et al. 2000

Can. J. Fish. Aquat. Sci.

103

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While the flow of energy is understood to determine the growth of organisms and the productivity of ecosystems, little is known about the sublethal effect of pollutants on the energetic efficiency of wild populations. We used field estimates of fish growth coupled to in situ estimates of food consumption rates obtained from the mass balance of a globally dispersed, trophically transferred radiotracer ( 137 Cs) to demonstrate the bioenergetic impairment of yellow perch (Perca flavescens) from lakes polluted by heavy metals (Cd, Cu, and Zn). Annual growth increment relative to the total energy budget (conversion efficiency) was about three times lower in cortisol-impaired yellow perch from metal-polluted lakes relative to yellow perch from reference lakes (4.2% compared with 10.8%), suggesting that fish exposed to pollutants experienced greater total energetic costs. In addition, metal-polluted lakes were dominated by adult yellow perch populations and simplified prey bases, suggesting that effects are occurring at multiple levels of biological organization. Our in situ bioenergetic approach to toxicity assessment provides a measurable and ecologically relevant endpoint for assessing the sublethal effects of pollutants on fish communities.Résumé : Bien qu'on sache que le flux d'énergie détermine la croissance des organismes et la productivité des écosys-tèmes, on sait peu de choses de l'effet sublétal des polluants sur l'efficacité énergétique des populations sauvages. Nous avons utilisé des estimations de la croissance des poissons dans la nature couplées à des estimations des taux d'alimentation in situ obtenues à partir du bilan massique d'un radiotraceur présent partout sur la Terre et transmis par voie trophique ( 137 Cs) pour déterminer la perturbation bioénergétique de la perchaude (Perca flavescens) de lacs pollués par des métaux lourds (Cd, Cu et Zn). L'incrément annuel de croissance en rapport avec le bilan énergétique global (efficacité de conversion) était environ 3 fois plus bas chez les perchaudes des lacs pollués par les métaux, dont le mé-tabolisme du cortisol était perturbé, que chez les perchaudes de lacs témoins (4,2% comparativement à 10,8%), ce qui indique que les coûts énergétiques totaux sont plus élevés chez les poissons exposés aux polluants. De plus, dans les lacs pollués par les métaux, les populations de perchaudes adultes étaient dominantes et la diversité des proies était faible, ce qui laisse penser que les effets des polluants se font sentir à divers niveaux du biote. Notre approche bioéner-gétique in situ en matière d'évaluation de la toxicité offre un paramètre mesurable et écologiquement pertinent pour évaluer les effets sublétaux des polluants sur les communautés de poissons.[Traduit par la Rédaction] Sherwood et al. 450

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A bioenergetics approach to modeling seasonal patterns in the bioaccumulation of radiocesium

Cited by 9 publications

References 8 publications

Seasonal variation in radiocesium levels of largemouth bass (Micropterus salmoides): Implications for humans and sensitive wildlife species

Seasonal variation in radiocesium levels of largemouth bass (Micropterus salmoides): Implications for humans and sensitive wildlife species

Parallelism in gene transcription among sympatric lake whitefish (Coregonus clupeaformisMitchill) ecotypes

Bioenergetic costs of heavy metal exposure in yellow perch (Perca flavescens): in situ estimates with a radiotracer (¹³⁷Cs) technique

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A bioenergetics approach to modeling seasonal patterns in the bioaccumulation of radiocesium

Cited by 9 publications

References 8 publications

Seasonal variation in radiocesium levels of largemouth bass (Micropterus salmoides): Implications for humans and sensitive wildlife species

Seasonal variation in radiocesium levels of largemouth bass (Micropterus salmoides): Implications for humans and sensitive wildlife species

Parallelism in gene transcription among sympatric lake whitefish (Coregonus clupeaformisMitchill) ecotypes

Bioenergetic costs of heavy metal exposure in yellow perch (Perca flavescens): in situ estimates with a radiotracer (137Cs) technique

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Bioenergetic costs of heavy metal exposure in yellow perch (Perca flavescens): in situ estimates with a radiotracer (¹³⁷Cs) technique