Feeding aggregants in the faeces of Dermestes maculatus De Geer

Levinson, Hermann Zacharias; Levinson, Anna R.; Francke, Wittko

doi:10.1007/bf00405648

Cited by 5 publications

(3 citation statements)

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“…The interdependance between the degree of arrestance and probing, on the one hand, and the nutritional condition of S. grunurius (particularly of females), on the other hand, suggests the existence of a causative connection between phagostimulation and a demand for food consumption. A similar relationship between dietary fat deficiency and intense phagostimulation by oleic or linoleic acid was demonstrated to occur in female Dermestes muculutus (LEVINSON et al 1980). Since wheat extract contains lipid constituents providing nutritional value to several insect species (LEVINSON 1976) including Sitophilus grunarius and S. oryzue (BAKER and MABIE 1973;BAKER 1973), some wheat lipids may have a dual function for granary weevils by acting as phagostimulants as well as nutrients.…”

Section: Effect Of Starvation On Phagostimulatory Responsesmentioning

confidence: 78%

“…Some of the above water soluble wheat components are both phagostimulants and nutrients for several species of storage insects (LEVINSON and LEVIN-SON 1978) like potassium and sodium salts for larvae of Anthrenus fluvipes (BAKER and SCHWALBE 1975), saccharose, maltose, glucose and fructose for larvae of Plodiu interpunctellu (BAKER and MABIE 1973) as well as amylopectin and dextrin for adult Sitophilus o y z u e (CHIPPENDALE 1972). Among the wheat lipids, certain triglycerides were found to be aggregants for adults of Tribolium confusum, T. custuneum (TAMAKI et al 1971 ;STARRAT and LOSCHIAVO 1972), (NAWROT and CZAPLICKY 1978) and for larvae of Sitotrogu cerealella (CHIPPENDALE and MANN 1972), while several long-chain, saturated and unsaturated, fatty acids are phagostimulants for Dermestes muculutus (COHEN and LEVINSON 1974;LEVINSON et al 1980) and, in combination with saccharose, for Plodiu interpunctellu (BAKER and MABIE 1973).…”

Section: Responses To Wheat Extracts and Solventsmentioning

confidence: 99%

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Feeding and oviposition behaviour of the granary weevil (Sitophilus granarius L.) induced by stored wheat, wheat extracts and dummies

Levinson

Kanaujia

1982

Zeitschrift für Angewandte Entomologie

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A detailed investigation of the feeding behaviour of starved and fed Sitophilus granarius L. of both sexes as well as the oviposition behaviour of granary weevils in response to stored wheat grains, wheat extracts and dummies was undertaken. Male and female granary weevils were found to respond to pentane, acetone or water extracts of stored winter wheat by a definite sequence of behaviour patterns ending up by arrestance and sustained feeding. The occurrence of olfactory sensilla is confined to the tip region of the terminal segment of the antennae of granary weevils. In S. granarius, antennectomy led to a reduced frequency of approaching 103 μg of wheat extract (pentane) which was 70–75% less than the respective parameter in untreated granary weevils of both sexes. Arrestance and probing of granary weevils were induced by water alone, indicating that the latter is a feeding stimulant. The aqueous extract of wheat was found most active and the pentane extract least active, while the acetone extract of wheat revealed intermediate activity in causing arrestance and probing of male and female S. granarius. The extent of previous feeding has a marked influence on the duration of arrestance of granary weevils on wheat extract. The maximal time of arrestance (probing included) on wheat extract was induced by a starvation period of 120 hours. Female granary weevils were usually more responsive than male granary weevils to wheat extracts of different polarity, offered in levels ranging from 10 to 103 μg. When exposed to wheat grains (stored for ˜ 1 year), gravid female S. granarius revealed a definite sequence of behaviour leading to oviposition in egg laying cavities followed by sealing of their openings. The process extending from food selection to oviposition was found to take about two hours. Oviposition behaviour of S. granarius was investigated by exposing gravid females to dummies made of white chalk (resembling the shape of wheat grains), which were impregnated with graded levels of wheat extract. Female S. granarius produced significantly more egg laying cavities in grains of stored wheat than in dummies impregnated by either 10−1, 10***0 or 102 grain equivalents of wheat extract, whereas the number of egg laying cavities in wheat grains and dummies was similar when the latter comprised 10 grain equivalents of wheat extract. The formation of egg laying cavities increased from the second through the eighth day on both dummies and wheat grains. Interestingly, antennectomized and intact females laid eggs in similar numbers. Female granary weevils failed to deposit eggs in egg laying cavities of dummies containing wheat extract, whereas they laid the usual number of eggs in wheat grains. It was concluded that the prerequisites for oviposition of S. granarius include (1) a medium of compressed particles (2) presence of the feeding stimulants available in wheat extract and (3) provision of a diet which is adequate for growth of the offspring. The feeding and oviposition stimulants which accumulate in wheat d...

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Section: Effect Of Starvation On Phagostimulatory Responsesmentioning

confidence: 78%

Section: Responses To Wheat Extracts and Solventsmentioning

confidence: 99%

Feeding and oviposition behaviour of the granary weevil (Sitophilus granarius L.) induced by stored wheat, wheat extracts and dummies

Levinson

Kanaujia

1982

Zeitschrift für Angewandte Entomologie

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“…471 First, the swift timeline under which elections occurred favored the preexisting political groups, primarily the Muslim Brotherhood, who have the financial and organizational capability to quickly organize election campaigns. 472 Although the military postponed the initial June date for the parliamentary elections, the parliamentary elections took place in staggered rounds beginning in November 2011, 473 a relatively short timetable for new political parties to form, organize, raise funds, and campaign. The military anticipated that "the principal beneficiaries of quick elections"-i.e., the pre-existing political groups-"[would] oppose a major constitutional overhaul" 474 and protect the Mubarak-era political structures that had benefited the military's interests.…”

Section: Procedural Entrenchmentmentioning

confidence: 99%

The Democratic Coup d'État

Varol¹

2017

Oxford Scholarship Online

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The term “coup d’état,” --French for stroke of the state--brings to mind coups staged by power-hungry generals who overthrow the existing regime, not to democratize but to concentrate power in their own hands as dictators. We assume all coups look the same, smell the same, and present the same threats to democracy. It’s a powerful, concise, and self-reinforcing idea. It’s also wrong. The Democratic Coup d’État advances a simple yet controversial argument: Sometimes a democracy is established through a military coup. The book covers events from the Athenian Navy’s stance in 411 BC against a tyrannical home government to coups in the American colonies that ousted corrupt British governors and to twentieth-century coups that toppled dictators and established democracy in countries as diverse as Guinea-Bissau, Portugal, and Colombia. Connecting the dots between these neglected events, the book tackles several baffling questions: How can an event as undemocratic as a military coup lead to democracy? Why would imposing generals—armed with tanks and guns and all—voluntarily surrender power to civilian politicians? What distinguishes militaries that help build democracies from those that destroy them? Varol’s arguments made headlines across the globe in major media outlets and were cited critically in a public speech by President Recep Tayyip Erdoğan of Turkey.

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Setiferous structures of male coleoptera

Faustini

Halstead²

1982

Journal of Morphology

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A scanning electron microscopy study was made of the male setiferous sex patches and analogous structures in 11 families of Coleoptera (Anthribidae, Bruchidae, Ciidae, Cleridae, Coccinellidae, Dermestidae, Leiodidae, Ptinidae, Staphylinidae, Tenebrionidae, and Ostomatidae). These secondary sexual characters appear to have several features in common including relatively long, often ridged, setae, cuticular ducts (frequently cribriform pore plates), and the production of a secretion. It is suggested that these structures may all be concerned with the production, release, and dissemination of pheromones.

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Feeding aggregants in the faeces of Dermestes maculatus De Geer

Cited by 5 publications

References 7 publications

Feeding and oviposition behaviour of the granary weevil (Sitophilus granarius L.) induced by stored wheat, wheat extracts and dummies

Feeding and oviposition behaviour of the granary weevil (Sitophilus granarius L.) induced by stored wheat, wheat extracts and dummies

The Democratic Coup d'État

Setiferous structures of male coleoptera

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