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Life table evaluation of survival and reproduction of the aphid, Sitobion avenae, exposed to cadmium.

Gao HH, Zhao HY, Du C, Deng MM, Du EX, Hu ZQ, Hu XS - J. Insect Sci. (2012)

Bottom Line: The results indicated that, the latter part of the reproduction period was significantly affected by Cd, according to the curve of the total survival rate (l(x)).In conclusion, survival and reproduction of S. avenae were inhibited under the treatment of the heavy metal Cd.Sitobion avenae was more sensitive to Cd at concentration of 20 mg/kg compared to the other concentrations.

View Article: PubMed Central - PubMed

Affiliation: Institute of Plant Protection, College of Plant Protection, Northwest Agriculture and Forest University, State Key Laboratory of Crop Stress Biology in Arid Areas, Yangling, Shaanxi 712100, China. gaohuanhuan368@126.com

ABSTRACT
The effects of cadmium (Cd) on the development, fecundity, and reproduction of the grain aphid, Sitobion avenae Fabricius (Hemiptera: Aphididae) were estimated by constructing a life table of S. avenae exposed to Cd. The concentrations of Cd in the soil were as follows: 0, 10, 20, 40, 80, and 160 mg/kg. The correlation analysis of the Cd concentration in soil and wheat revealed that the amount in the wheat increased with the increase of Cd concentrations in soil. The results indicated that, the latter part of the reproduction period was significantly affected by Cd, according to the curve of the total survival rate (l(x)). The net reproductive rate (R(0)), innate capacity of increase (r), and finite rate of increase (λ) of S. avenae all decreased under the stress of Cd, and were lowest at a Cd concentration of 20 mg/kg. Cd also negatively affected fecundity and m(x) (the number of offspring produced by an individual female). At 20 mg/kg, the decline of them was most obvious. In conclusion, survival and reproduction of S. avenae were inhibited under the treatment of the heavy metal Cd. Sitobion avenae was more sensitive to Cd at concentration of 20 mg/kg compared to the other concentrations. This concentration can be used to examine the mechanisms behind population genetics and biological mutation of S. avenae when exposed to heavy metal.

Show MeSH
The age-specific survival rate (lx) and age-specific fecundity (mx) of Sitobion avenae with six levels of Cd treatment. S. avenae reared on the experimental contaminated wheat planted in the soil with five concentrations: 10 (A), 20 (B), 40 (C), 80 (D), and 160 mg/kg (E). The control (F) was 0 mg/kg. High quality figures are available online.
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f02_01: The age-specific survival rate (lx) and age-specific fecundity (mx) of Sitobion avenae with six levels of Cd treatment. S. avenae reared on the experimental contaminated wheat planted in the soil with five concentrations: 10 (A), 20 (B), 40 (C), 80 (D), and 160 mg/kg (E). The control (F) was 0 mg/kg. High quality figures are available online.

Mentions: The total survival rate (lx) is the probability that a first instar nymph will survive to age x. The total survival rate of S. avenae declined evenly and slowly (Figures 2A–F). The rapid decrease in survival rate in the later life stages is shown in the curves under the treatment of Cd (F5,17= 175.46, p < 0.01) (Table 1). The parameter b in the quadratic regression equation of Cd treatments increased significantly compared to the control. This shows that exposure to Cd had significant negative effects on the later stages of reproduction.


Life table evaluation of survival and reproduction of the aphid, Sitobion avenae, exposed to cadmium.

Gao HH, Zhao HY, Du C, Deng MM, Du EX, Hu ZQ, Hu XS - J. Insect Sci. (2012)

The age-specific survival rate (lx) and age-specific fecundity (mx) of Sitobion avenae with six levels of Cd treatment. S. avenae reared on the experimental contaminated wheat planted in the soil with five concentrations: 10 (A), 20 (B), 40 (C), 80 (D), and 160 mg/kg (E). The control (F) was 0 mg/kg. High quality figures are available online.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3472964&req=5

f02_01: The age-specific survival rate (lx) and age-specific fecundity (mx) of Sitobion avenae with six levels of Cd treatment. S. avenae reared on the experimental contaminated wheat planted in the soil with five concentrations: 10 (A), 20 (B), 40 (C), 80 (D), and 160 mg/kg (E). The control (F) was 0 mg/kg. High quality figures are available online.
Mentions: The total survival rate (lx) is the probability that a first instar nymph will survive to age x. The total survival rate of S. avenae declined evenly and slowly (Figures 2A–F). The rapid decrease in survival rate in the later life stages is shown in the curves under the treatment of Cd (F5,17= 175.46, p < 0.01) (Table 1). The parameter b in the quadratic regression equation of Cd treatments increased significantly compared to the control. This shows that exposure to Cd had significant negative effects on the later stages of reproduction.

Bottom Line: The results indicated that, the latter part of the reproduction period was significantly affected by Cd, according to the curve of the total survival rate (l(x)).In conclusion, survival and reproduction of S. avenae were inhibited under the treatment of the heavy metal Cd.Sitobion avenae was more sensitive to Cd at concentration of 20 mg/kg compared to the other concentrations.

View Article: PubMed Central - PubMed

Affiliation: Institute of Plant Protection, College of Plant Protection, Northwest Agriculture and Forest University, State Key Laboratory of Crop Stress Biology in Arid Areas, Yangling, Shaanxi 712100, China. gaohuanhuan368@126.com

ABSTRACT
The effects of cadmium (Cd) on the development, fecundity, and reproduction of the grain aphid, Sitobion avenae Fabricius (Hemiptera: Aphididae) were estimated by constructing a life table of S. avenae exposed to Cd. The concentrations of Cd in the soil were as follows: 0, 10, 20, 40, 80, and 160 mg/kg. The correlation analysis of the Cd concentration in soil and wheat revealed that the amount in the wheat increased with the increase of Cd concentrations in soil. The results indicated that, the latter part of the reproduction period was significantly affected by Cd, according to the curve of the total survival rate (l(x)). The net reproductive rate (R(0)), innate capacity of increase (r), and finite rate of increase (λ) of S. avenae all decreased under the stress of Cd, and were lowest at a Cd concentration of 20 mg/kg. Cd also negatively affected fecundity and m(x) (the number of offspring produced by an individual female). At 20 mg/kg, the decline of them was most obvious. In conclusion, survival and reproduction of S. avenae were inhibited under the treatment of the heavy metal Cd. Sitobion avenae was more sensitive to Cd at concentration of 20 mg/kg compared to the other concentrations. This concentration can be used to examine the mechanisms behind population genetics and biological mutation of S. avenae when exposed to heavy metal.

Show MeSH