Post‐copulatory Mounting Behavior of the West Indian Sweetpotato Weevil, Euscepes postfasciatus (Fairmaire) (Coleoptera: Curculionidae)

Sato, Yuuji; Kohama, Tsuguo

doi:10.1111/j.1439-0310.2006.01309.x

Cited by 33 publications

(33 citation statements)

References 27 publications

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“…Males attempting to mate could be attracted to tubers that attracted females for oviposition. Both positive and negative responses of the female to the male are known in this weevil (Sato and Kohama 2007). Each weevil female usually lays one to several eggs a day, particularly when it is dark Alleyne 1991, Shimoji andKohama 1994).…”

Section: Discussionmentioning

confidence: 99%

Sweet Potato Resistance to Euscepes postfasciatus (Coleoptera: Curculionidae): Larval Performance Adversely Effected by Adult's Preference to Tuber for Food and Oviposition

et al. 2014

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The preferences of the West Indian sweet potato weevil, Euscepes postfasciatus (Fairmaire), to tubers of sweet potato, Ipomoea batatas (L.), for food and for oviposition were evaluated, and correlated to sweet potato's resistance to immatures. Adults (parent) were released in a plastic box containing tubers of sweet potato cultivars and maintained for 5 d, after which the adults on each tuber were counted. All adults were then removed and each tuber was maintained separately. New adults that emerged from the tubers were counted. Cultivars were grouped by cluster analyses using the number of parent adults on the tubers and the number of new adults emerging from the tubers, adjusted for the weight of each tuber. Cultivars were divided into five groups: average level of preference, preferred, preferred for oviposition but not for food, preferred for food but not for oviposition, and not preferred. New adults from the first two groups took less time to eclose than those from the other groups, and their body size was smaller. In a second experiment, one to five cultivars were selected from each group and inoculated each tuber with 10 weevil eggs on each cultivar. Although the proportion of eclosed adults was not significantly different between cultivars, the time to eclosion was shorter and body size was smaller on preferred cultivars. The selection of tubers by parent adults was not linearly related with larval development, and did not reduce the survival of the immatures.

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Section: Discussionmentioning

confidence: 99%

Sweet Potato Resistance to Euscepes postfasciatus (Coleoptera: Curculionidae): Larval Performance Adversely Effected by Adult's Preference to Tuber for Food and Oviposition

et al. 2014

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“…obs). Females are polyandrous (Sato & Kohama 2007). The average rate of oviposition was one egg per day and females oviposited for 4–6 mo (Raman & Alleyne 1991).…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, encounter rates will be low. This weevil is polygynous species (Sato & Kohama, 2007) and relatively long reproductive period (Raman & Alleyne 1991). Under these conditions and low inbreeding depression, theory predicts inbreeding with close relatives should not be avoided and would be adaptive as it increases inclusive fitness and ensures mating opportunities.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Inbreeding on Mating Behaviour of West Indian Sweet Potato Weevil Euscepes postfasciatus

et al. 2011

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When there is an inbreeding depression, mating with a kin individual is generally considered maladaptive behaviour. However, in some conditions, the inclusive fitness benefits from inbreeding may outweigh the costs of inbreeding depression, and thus, inbreeding tolerance is often adaptive. Inbreeding depression and the effect of relatedness on mating behaviour in the West Indian sweet potato weevil Euscepes postfasciatus were examined. No significant inbreeding depression was detected as indicated by body weight and number of progeny emerging from sweet potato roots. Male mating performance (i.e. number of mating occurrences per night) was adversely affected by inbreeding depression, but the effect was low (fitness loss was 6.3%). Although there were no significant differences in latency to mounting, pre‐copulatory guarding, copulation and post‐copulatory guarding duration between full‐sib and non‐kin pairs, the copulation rate of full‐sib pairs was significantly higher than that of non‐kin pairs. These results support the theoretical prediction that when inbreeding depression is weak, copulation with close relative individuals is favoured.

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“…Both males and females mate multiply in their lifetime. Although a single male is able to inseminate up to five females in one night, females become unreceptive for about 1 week after copulation (Sato and Kohama 2007;Kumano et al 2009a). The mating behavior lasts for about 50 min, during which time male weevils mount females both before and after copulation (Kumano et al 2009a(Kumano et al , 2010.…”

Section: Insect and Irradiationmentioning

confidence: 98%

Effect of low temperature between fractionated-dose irradiation doses on mating of the West Indian sweetpotato weevil, Euscepes postfasciatus (Coleoptera: Curculionidae)

et al. 2011

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The effectiveness of the sterile insect technique (SIT) depends on the ability of released sterile males to mate with and inseminate wild females, but the use of gamma radiation to induce sterility negatively affects both somatic and reproductive cells of the sterilized insects. Recently, the effectiveness of fractionated-dose irradiation (FI), in which a sterilizing dose is delivered over time in a series of small irradiations, has been demonstrated in the West Indian sweetpotato weevil Euscepes postfasciatus (Fairmaire). FI improves male mating propensity compared with acute irradiation; however, this renewed technique takes a long time (72 h in the present circumstances) compared with the traditional technique (approximately 20 min) using single-dose irradiation (150 Gy) to fully sterilize this weevil. The extra time required by FI might negatively affect the quality of released sterile males, because weevils expend limited resources, such as metabolic energy or sperm, in mating freely in this period. We evaluated whether the temporal storage of weevils at low temperature (5°C and 15°C) improves the quality of sterile males compared with the normal condition (25°C). Temporal storage at low temperature in FI improves male mating propensity. For example, the sexually active phase of males exposed to 15°C was 18 days at least after irradiation. This period was longer than that of normal males (14 days). Meanwhile, this manner delayed male reproductive development and temporarily reduced mating competitiveness ability. If considering the long active phase of sterile males exposed to 15°C, these disadvantage would be cancelled out. We discuss the advantage of FI with temporal storage at low temperature in the eradication program using SIT for E. postfasciatus.

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Post‐copulatory Mounting Behavior of the West Indian Sweetpotato Weevil, Euscepes postfasciatus (Fairmaire) (Coleoptera: Curculionidae)

Cited by 33 publications

References 27 publications

Sweet Potato Resistance to <I>Euscepes postfasciatus</I> (Coleoptera: Curculionidae): Larval Performance Adversely Effected by Adult's Preference to Tuber for Food and Oviposition

Sweet Potato Resistance to <I>Euscepes postfasciatus</I> (Coleoptera: Curculionidae): Larval Performance Adversely Effected by Adult's Preference to Tuber for Food and Oviposition

The Effect of Inbreeding on Mating Behaviour of West Indian Sweet Potato Weevil Euscepes postfasciatus

Effect of low temperature between fractionated-dose irradiation doses on mating of the West Indian sweetpotato weevil, Euscepes postfasciatus (Coleoptera: Curculionidae)

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