Modeling Demographic Response to Constant Temperature in <I>Hypera postica</I> (Coleoptera: Curculionidae)

Abstract

Alfalfa weevil, Hypera postica (Gyllenhal) (Coleoptera: Curculionidae), is among the most destructive pests of alfalfa, Medicago sativa L., in the world. Survivorship and fecundity schedules of H. postica were investigated to characterize the population growth potential of the weevil at six constant temperatures: 11.5, 14.0, 19.0, 24.0, 29.0, and 31.5 degrees C. Preoviposition period, oviposition period and female longevity significantly decreased with rising temperature within the temperature range tested. At the respective temperatures adult female lived an average of 294.2, 230.2, 163.6, 141.0, 84.10, and 32.9 d, with average lifetime progeny production of 470, 814, 2209, 3619, 2656, and 338 eggs per female. The net reproductive rates (R0) were 86.9, 288.0, 869.7, 1,479.7, 989.8, and 107.8 females per female, respectively. Mean daily fecundity (Mx) was modeled as a function of time by using both Enkegaard and Analytis models. Survivorship data (l(x)) of adult females were summarized and compared using the shape and scale parameters of the Weibull frequency distribution model across the temperature range tested. Life table entropy values within the range 14.0-31.5 degrees C (H < 0.5) indicates Slobodkin's type I survivorship curve; however, the value of 0.806 at 11.5 degrees C (H > 0.5) corresponds to type III. As temperature increased, the r(m) exhibited an asymmetrical dome-shaped pattern, with a maximum value of 0.114 females per female per d at 29.0 degrees C. The r(m)-temperature relation of weevils was modeled and critical temperatures (T(Min), T(Opt), and T(Max)) for intrinsic rate of increase of the weevil were computed as 8.83, 30.61, and 32.14 degrees C and 5.72, 29.94, and 32.12 degrees C by using Analytis/Allahyari and Analytis/Briere-2 models, respectively.

Developmental differences of local populations of alfalfa weevil (Hypera postica) (Coleoptera: Curculionidae)

“…Due to its high abundance, H. postica is the number one pest of alfalfa in Iran (Sanaei et al, 2015a). Many of the previous studies on H. postica in Iran focused on pest management in specific regions (Khanjani and Pourmirza, 2004;Moradi-Vajargah et al, 2011, 2013 without respect to population differences and so far life history traits have only been studied for Hamadan populations (Zahiri et al, 2010a(Zahiri et al, , 2010b(Zahiri et al, , 2014. However, very recently, some morphological variation among Iranian populations has been detected (Sanaei et al, 2015b(Sanaei et al, , 2015c).…”

Nonlinear models for describing development and fecundity of the pseudococcid predators Nephus includens and Nephus bisignatus

“…Several mathematical models have been used for describing the development of insects over a wide range of temperatures such as Logan-6, Lactin, Sharpe and DeMichele, Briere, Bieri-1 and 2, Analytis and Enkegaard equations (Lactin et al 1995, Roy et al 2002, Kontodimas et al 2004, Arbab et al 2006, 2008, Zahiri et al 2010, Ranjbar et al 2011. Similarly, some mathematical models have been used to describe fecundity or fertility at different temperatures such us the equations of Bieri-1 and 2, Enkegaard, Ydergaard and Analytis (Bieri et al 1983, Enkegaard 1993, Ydergaard et al 1997, Lanzoni et al 2004, Kontodimas et al 2007, Ranjbar et al 2011.…”

Genetically manipulated Brassica genotypes affect demography and performance of Diadegma semiclausum parasitizing Plutella xylostella

“…,b; Zahiri et al. ; Karimi‐Malati et al. ), the performance of the parasitoid was calculated using age‐stage, two‐sex life tables (Chi and Liu ; Chi ).…”

“…To have a range of manipulated genotypes, we selected canola's progenitor (B. rapa) as a wild-type species, two cultivated canola cultivars (Opera and RGS 003 ), one hybrid (Hyula 401 ), one gamma irradiated genetic mutant-RGS 003 and PF, a transgenic genotype (that expresses a tolerance gene to herbicide), to represent high-and low-quality host plants that differ dramatically in GS content and previously were shown to significantly affect the performance of DBM (Nikooei et al 2015a). As life table studies provide details of survival, development and reproduction (Taghizadeh et al 2008;Golizadeh et al 2009a,b;Zahiri et al 2010;Karimi-Malati et al 2014), the performance of the parasitoid was calculated using age-stage, two-sex life tables (Chi and Liu 1985;Chi 1988). In addition, several fitness correlates of the parasitoid (e.g.…”