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Nishide Y.,Tokyo University of Agriculture and Technology | Nishide Y.,National Institute of Agro biological science at Ohwashi NIASO | Watanabe K.,Tokyo University of Agriculture and Technology | Inoue H.,Tokyo University of Agriculture and Technology | And 4 more authors.
Applied Entomology and Zoology | Year: 2013

We developed and characterized nine microsatellite loci for the polyembryonic wasp Copidosoma floridanum (Ashmead) (Hymenoptera: Encyrtidae). Eight of the nine loci were polymorphic and did not deviate from Hardy-Weinberg equilibrium. Our results will contribute to studies on the population genetic structure of C. floridanum. © 2012 The Japanese Society of Applied Entomology and Zoology.

Nishide Y.,National Institute of Agro biological science at Ohwashi NIASO | Harano K.-I.,Tamagawa University | Tanaka S.,National Institute of Agro biological science at Ohwashi NIASO | Nagayama A.,Okinawa Prefectural Agricultural Research Center | And 4 more authors.
Journal of Insect Behavior | Year: 2013

The subtropical scarab beetle, Dasylepida ishigakiensis, has a two-year life cycle. This study showed the time of adult emergence from the soil relative to the time of dusk and the presence of the female sex pheromone. Beetles collected on Miyako Island were transported to Tsukuba where they were immediately placed under natural day lengths in February. They exhibited two emergence peaks that corresponded to the times of dusk in Tsukuba and on the island, respectively. Males emerged precociously if a lure containing synthetic female sex pheromone was placed in their container, whereas the females' behavior was unaffected. Previous observations that mated females dig deeper in the soil than virgin females, males or mated males were confirmed. To explore the underlying mechanism controlling the behavioral change associated with mating, liquid material derived from the male accessory glands, seminal vesicles and female bursa copulatrix was injected into beetles, but without any significant influence on burrowing behavior. No significant influence was also observed in beetles injected with anisomycin, an inhibitor of protein synthesis related to memory in other animals. © 2012 Springer Science+Business Media New York.

Ben Hamouda A.,National Institute of Agro biological science at Ohwashi NIASO | Tanaka S.,National Institute of Agro biological science at Ohwashi NIASO
Journal of Arid Environments | Year: 2016

The effects of temperature and moisture during the egg stage on hatchling phase characteristics of Locusta migratoria were investigated. The incubation temperature of eggs laid by crowd-reared females affected embryonic development and some phase characteristics of the hatchlings. Incubation at 20 °C caused eggs to develop more slowly and to produce more black hatchlings than those incubated at 30 °C. A correlation was found between body size and cuticular melanism of hatchlings at these temperatures; however, the correlation was lower at the lower temperature. When large eggs expected to produce large and black hatchlings were exposed to dry conditions, they produced small, whitish hatchlings, typical of the solitary phase. However, unlike typical solitary individuals, these nymphs did not show extra moulting and had only 5 stadia before reaching the adult stage. These results suggested that deprivation of water from eggs may produce progeny looking like solitarious forms, but developmental traits such as numbers of nymphal stadia were unaffected. © 2016 Elsevier Ltd

Maeno K.,National Institute of Agro biological science at Ohwashi NIASO | Maeno K.,National Locust Control Center | Tanaka S.,National Institute of Agro biological science at Ohwashi NIASO
Physiological Entomology | Year: 2012

Crowding causes many organisms to express phenotypic plasticity in various traits. Phase polyphenism in desert locusts represents one extreme example in which a solitary form (solitarious phase) turns into a gregarious form (gregarious phase) in response to crowding. Conspicuous differences in body size and colour occur even in hatchlings. The phase-specific differences in hatchling characteristics are caused by the tactile stimuli perceived by the antennae of their mother. However, the nature of the tactile stimuli and the mechanism by which the perceived stimuli are processed as a gregarizing signal remain unknown. To explore this problem, the antennae of solitarious adult females of the desert locust Schistocerca gregaria are touched with the bodies of conspecific locusts at different physiological stages and those of other species. The results suggest that a cuticular chemical factor at a specific developmental stage of conspecific locusts causes the solitarious females to produce large eggs that give rise to black hatchlings characteristic of gregarious forms (progeny gregarization), and that this or a similar compound occurs in other acridids, crickets and cockroaches but not in beetles. The involvement of a chemical substance is also supported by hexane extracts of cuticular surfaces of locusts that induce the same effects. Interestingly, crowding induces such gregarizing effects only when the female receives the appropriate stimulus in the presence of light. Solitarious female S. gregaria with their head capsule coated with phosphorescent paint exhibit progeny gregarization in response to crowding and light pulses in darkness, whereas those treated in the same way without light pulses fail to do so. © 2011 The Authors. Physiological Entomology © 2011 The Royal Entomological Society.

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