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1 October 2004 Life History of Podisus maculiventris (Heteroptera: Pentatomidae) Adult Females Under Different Constant Temperatures
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Life table analysis was performed on Podisus maculiventris (Say) adult females at constant temperatures of 16, 26, 30, and 36°C. Survivorship curves were linear type II, with steeper rates of decline at higher temperatures. Longevity at 16°C (47.2 d) was significantly longer than that at 26°C (14.3 d) or 30°C (12 d). Adults under the 36°C survived only 4.9 d and laid no eggs. Percentage of eggs that hatched was relatively constant at ≈ or about 40% at 16, 26, and 30°C. Numbers of egg clutches (ranging from 5.9 to 9.4), eggs per clutch (13.6–14.6), and eggs in the first clutch (9.0–15.1) did not differ significantly at these three temperatures. However, preoviposition period was significantly longer at 16°C (20.3 d) than at 26°C (6.3 d) and 30°C (4.9 d). Number of eggs laid was related to body weight by the equation E = −139.1 3.49w, where E is number of eggs laid per female lifetime, and w is the weight of the predator female. Life table analysis of P. maculiventris female adults showed that both net reproductive rate (R0) and gross reproductive rate (GRR) were highest at 26°C, estimated at 47.8 and 156.0 females per female, respectively. However, the shorter generation times at 30°C (T = 42.2 d) resulted in higher values for the intrinsic rate of increase (r = 0.09), the finite rate of increase (λ = 1.09), and doubling time (DT = 7.7 d). Analysis of cumulative egg production suggests that 26°C may be more suitable for maintaining colonies of P. maculiventris because of the sustained levels of egg production over a longer period, compared with the 30°C treatment.

Jesusa Crisostomo Legaspi "Life History of Podisus maculiventris (Heteroptera: Pentatomidae) Adult Females Under Different Constant Temperatures," Environmental Entomology 33(5), 1200-1206, (1 October 2004).
Received: 4 November 2003; Accepted: 1 August 2004; Published: 1 October 2004

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