Life history of Podisus maculiventris (Heteroptera: Pentatomidae) adult females under different constant temperatures
2004
Legaspi, J.C.
Life table analysis was performed on Podisus maculiventris (Say) adult females at constant temperatures of 16, 26, 30, and 36 degrees C. Survivorship curves were linear type II, with steeper rates of decline at higher temperatures. Longevity at 16 degrees C (47.2 d) was significantly longer than that at 26 degrees C (14.3 d) or 30 degrees C (12 d). Adults under the 36 degrees C survived only 4.9 d and laid no eggs. Percentage of eggs that hatched was relatively constant at approximately equal to or about 40% at 16, 26, and 30 degrees 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 degrees C (20.3 d) than at 26 degrees C (6.3 d) and 30 degrees 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 degrees C, estimated at 47.8 and 156.0 females per female, respectively. However, the shorter generation times at 30 degrees C (T = 42.2 d) resulted in higher values for the intrinsic rate of increase (r = 0.09), the finite rate of increase (lambda = 1.09), and doubling time (DT = 7.7 d). Analysis of cumulative egg production suggests that 26 degrees 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 degrees C treatment.
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