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Accueil du site → Doctorat → Royaume-Uni → 1965-1980 → Effects of the soil environment on oviposition and egg development of the desert locust, Schistocerca gregaria (Forsk)

University of London - Imperial College London (1966)

Effects of the soil environment on oviposition and egg development of the desert locust, Schistocerca gregaria (Forsk)

Abd El-Hadi, Nabil Hussein

Titre : Effects of the soil environment on oviposition and egg development of the desert locust, Schistocerca gregaria (Forsk)

Auteur : Abd El-Hadi, Nabil Hussein

Université de soutenance : University of London - Imperial College London

Grade : Doctor of Philosophy (PhD) 1966

Résumé
Field observations were carried out on the oviposition behaviour of the desert locust swarms in relation to soil moisture. Laboratory experiments are described on the effect of soil environments on the selection of oviposition sites. The factors examined were soil compaction, temperature, type and particles size. Investigations on the following are also described :- 1. The effect of soil moisture on egg development and hatching of larvae from gregaria egg-pods at two temperatures. 2. Egg development and the quality of the hatchlings from solitaria egg-pods in relation to soil moisture. 3. Soil salinity on egg development and hatching of larvae from gregaria egg-pods. 4, The weight, water contents, colour and survival capacity of the hatchlings in all the above experiments. 5. Moisture Kinetics of the eggs in hypotonic, isotonic and hypertonic solutions of sea water and glucose. 6. The osmotic pressure of the egg contents as determined by the depression of the freezing point method. The mechanism of water absorption by the eggs is discussed and also the role of environmental conditions in phase transformation and the nature of phases.

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