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Ontogenetic phase shifts in metabolism in a flounder Paralichthys olivaceus.

Yagi M, Oikawa S - Sci Rep (2014)

Bottom Line: Size-scaling metabolism is widely considered to be of significant importance in biology and ecology.These shifts in metabolism during the early life stages are similar to the tiger puffer, Takifugu rubripes.Our results indicate that ontogenetic phase shifts in metabolism are key to understanding intraspecific size-scaling metabolism in fishes.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Fisheries, Nagasaki University, Bunkyo, Nagasaki 852-8521, Japan.

ABSTRACT
Size-scaling metabolism is widely considered to be of significant importance in biology and ecology. Thus, allometric relationships between metabolic rate (VO2) and body mass (M), VO2 = a(i)Mb, have long been a topic of interest and speculation. It has been proposed that intraspecifically metabolic rate scales isometrically or near isometrically with body mass during the early life history in fishes, invertebrates, birds and mammals. We developed a new perspective on intraspecific size-scaling metabolism through determination of metabolic rate in the Japanese flounder, Paralichthys olivaceus, during their early life stages spanning approximately four orders of magnitude in body mass. With the increase of body mass, the Japanese flounder had four distinct negative allometric phases in which three stepwise increases in scaling constants (ai, i = 1-4), i.e. ontogenetic phase shifts in metabolism, occurred with growth during its early life stages at around 0.002, 0.01 and 0.2 g, maintaining each scaling exponent constant in each phase (b = 0.831). These shifts in metabolism during the early life stages are similar to the tiger puffer, Takifugu rubripes. Our results indicate that ontogenetic phase shifts in metabolism are key to understanding intraspecific size-scaling metabolism in fishes.

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Related in: MedlinePlus

Ontogenetic changes in the rate of respiration (, diamonds) and the mass-specific rate of respiration (, circles) with increase of body mass (M) in Japanese flounder.Symbols for  indicate the two methods of respirometry (open: closed method and solid: semi-closed method). Symbols for  signify the year in which data were collected (open: 2005 and solid: 2006). The vertical broken lines at around 0.0003 g represent  and  which increased daily from just after hatching to 7 days after hatching, with virtually no increase in body mass. Ranges covered by the four solid lines each for  and  indicate intragroup phases of negative allometry. The broken lines both on  and  represent the intergroup lines. Small symbols represent values during the transitional phases. Regression analysis of each line for  is presented in Table 1, and ANCOVA in Table 2.
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f1: Ontogenetic changes in the rate of respiration (, diamonds) and the mass-specific rate of respiration (, circles) with increase of body mass (M) in Japanese flounder.Symbols for indicate the two methods of respirometry (open: closed method and solid: semi-closed method). Symbols for signify the year in which data were collected (open: 2005 and solid: 2006). The vertical broken lines at around 0.0003 g represent and which increased daily from just after hatching to 7 days after hatching, with virtually no increase in body mass. Ranges covered by the four solid lines each for and indicate intragroup phases of negative allometry. The broken lines both on and represent the intergroup lines. Small symbols represent values during the transitional phases. Regression analysis of each line for is presented in Table 1, and ANCOVA in Table 2.

Mentions: Rates of oxygen consumption ( in µl O2 fish−1 min−1) in relation to body mass (M in g) are plotted in Figure 1. Mass-specific rates of oxygen consumption (/M in µl O2 g−1 min−1) are also presented. increased daily from just after hatching to 7 days after hatching (DAH), with virtually no increase of body mass. After 7 DAH, body mass increased. There was no substantial difference between the results of the two different methods of respirometry (Figure 1). Therefore, the values obtained were used without any distinction for the relationship between oxygen consumption and body mass.


Ontogenetic phase shifts in metabolism in a flounder Paralichthys olivaceus.

Yagi M, Oikawa S - Sci Rep (2014)

Ontogenetic changes in the rate of respiration (, diamonds) and the mass-specific rate of respiration (, circles) with increase of body mass (M) in Japanese flounder.Symbols for  indicate the two methods of respirometry (open: closed method and solid: semi-closed method). Symbols for  signify the year in which data were collected (open: 2005 and solid: 2006). The vertical broken lines at around 0.0003 g represent  and  which increased daily from just after hatching to 7 days after hatching, with virtually no increase in body mass. Ranges covered by the four solid lines each for  and  indicate intragroup phases of negative allometry. The broken lines both on  and  represent the intergroup lines. Small symbols represent values during the transitional phases. Regression analysis of each line for  is presented in Table 1, and ANCOVA in Table 2.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4238301&req=5

f1: Ontogenetic changes in the rate of respiration (, diamonds) and the mass-specific rate of respiration (, circles) with increase of body mass (M) in Japanese flounder.Symbols for indicate the two methods of respirometry (open: closed method and solid: semi-closed method). Symbols for signify the year in which data were collected (open: 2005 and solid: 2006). The vertical broken lines at around 0.0003 g represent and which increased daily from just after hatching to 7 days after hatching, with virtually no increase in body mass. Ranges covered by the four solid lines each for and indicate intragroup phases of negative allometry. The broken lines both on and represent the intergroup lines. Small symbols represent values during the transitional phases. Regression analysis of each line for is presented in Table 1, and ANCOVA in Table 2.
Mentions: Rates of oxygen consumption ( in µl O2 fish−1 min−1) in relation to body mass (M in g) are plotted in Figure 1. Mass-specific rates of oxygen consumption (/M in µl O2 g−1 min−1) are also presented. increased daily from just after hatching to 7 days after hatching (DAH), with virtually no increase of body mass. After 7 DAH, body mass increased. There was no substantial difference between the results of the two different methods of respirometry (Figure 1). Therefore, the values obtained were used without any distinction for the relationship between oxygen consumption and body mass.

Bottom Line: Size-scaling metabolism is widely considered to be of significant importance in biology and ecology.These shifts in metabolism during the early life stages are similar to the tiger puffer, Takifugu rubripes.Our results indicate that ontogenetic phase shifts in metabolism are key to understanding intraspecific size-scaling metabolism in fishes.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Fisheries, Nagasaki University, Bunkyo, Nagasaki 852-8521, Japan.

ABSTRACT
Size-scaling metabolism is widely considered to be of significant importance in biology and ecology. Thus, allometric relationships between metabolic rate (VO2) and body mass (M), VO2 = a(i)Mb, have long been a topic of interest and speculation. It has been proposed that intraspecifically metabolic rate scales isometrically or near isometrically with body mass during the early life history in fishes, invertebrates, birds and mammals. We developed a new perspective on intraspecific size-scaling metabolism through determination of metabolic rate in the Japanese flounder, Paralichthys olivaceus, during their early life stages spanning approximately four orders of magnitude in body mass. With the increase of body mass, the Japanese flounder had four distinct negative allometric phases in which three stepwise increases in scaling constants (ai, i = 1-4), i.e. ontogenetic phase shifts in metabolism, occurred with growth during its early life stages at around 0.002, 0.01 and 0.2 g, maintaining each scaling exponent constant in each phase (b = 0.831). These shifts in metabolism during the early life stages are similar to the tiger puffer, Takifugu rubripes. Our results indicate that ontogenetic phase shifts in metabolism are key to understanding intraspecific size-scaling metabolism in fishes.

Show MeSH
Related in: MedlinePlus