The Growth-Changes and Structure of the Egg of the African Migratory Locust, Locusta migratoria migratorioides, R. & F. (Orthoptera, Acrididae)

1936 ◽  
Vol 27 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Mithan Lal Roonwal
Keyword(s):  
Water Content ◽  
Locusta Migratoria ◽  
Dry Weight ◽  
Vitelline Membrane ◽  
Moist Soil ◽  
Migratory Locust ◽  
Locusta Migratoria Migratorioides ◽  
Wet Weight ◽  
Growth Changes

The eggs of Locusta migratoria migratorioides, R. & F., increase in size during development. The increase is due to the absorption of water from the surrounding moist soil.The wet weight of a freshly laid egg is 0·0063±0·0008 gms, and of a fully developed egg 0·014±0·002 gms. The dry weight of a freshly laid egg is 0·003± 0·0004 gms. and of a fully developed egg 0·0024±0·0002 gms. The water-content of an egg increases from 51·92±3·53 per cent, of the wet weight in the freshly laid egg to 82·36±2·14 per cent, in the fully developed egg.The egg-wall consists of an exo- and endochorion and a thick vitelline membrane. The latter has a felt-like structure in the freshly laid egg, but as the egg develops, this membrane increases in thickness and acquires a laminated character.The micropylar apparatus consists of a ring of about 35–43 oblique, funnelshaped canals arranged round the egg near its posterior end.

Dehydration of seabird prey during transport to the colony: effects on wet weight energy densities

1987 ◽  
Vol 65 (11) ◽  
pp. 2822-2824 ◽  
Author(s):  
W. A. Montevecchi ◽  
J. F. Piatt
Keyword(s):  
Water Content ◽  
Dry Weight ◽  
Data Sets ◽  
Fresh Weight ◽  
Present Evidence ◽  
Wet Weight ◽  
Cautious Interpretation ◽  
Existing Data

We present evidence to indicate that dehydration of prey transported by seabirds from capture sites at sea to chicks at colonies inflates estimates of wet weight energy densities. These findings and a comparison of wet and dry weight energy densities reported in the literature emphasize the importance of (i) accurate measurement of the fresh weight and water content of prey, (ii) use of dry weight energy densities in comparisons among species, seasons, and regions, and (iii) cautious interpretation and extrapolation of existing data sets.

scholarly journals SURVIVAL OF MIGRATORY LOCUST AT DIFFERENT KEEPING CONDITIONS

2020 ◽  
Author(s):  
A.B. Gerus ◽  
◽  
Y.S. Tokarev ◽  
G.R. Lednev ◽  
M.B. Levchenko ◽  
...  
Keyword(s):  
Survival Rate ◽  
Locusta Migratoria ◽  
Migratory Locust ◽  
Locusta Migratoria Migratorioides ◽  
Gregarious Locusts

In this article we studied the conditions for keeping two species of gregarious locusts: the African migratory locust (Locusta migratoria migratorioides) and the Asian migratory locust (Locusta migratoria migratoria) in open and shaded areas. Based on the data obtained, it is shown that the survival rate of insects of the non-diapausal subspecies was higher in comparison with the obligate monovoltine.

A Physiological Interpretation of the Marching of Hoppers of the African Migratory Locust (Locusta Migratoria Migratorioides R. & F.)

1954 ◽  
Vol 31 (2) ◽  
pp. 271-279
Author(s):  
PEGGY E. ELLIS ◽  
G. HOYLE
Keyword(s):  
Filter Paper ◽  
Potassium Salt ◽  
Locusta Migratoria ◽  
Sugar Solution ◽  
Migratory Locust ◽  
Low Concentration ◽  
Locusta Migratoria Migratorioides ◽  
Retarding Effect ◽  
Short Period ◽  
Blood Potassium

1. Hoppers of the locust Locusta migratoria migratorioides R. & F., which have been reared crowded, exhibit characteristic marching behaviour in the laboratory in foodless cages under standard conditions. 2. The rate of attainment of maximum marching by a given group of hoppers is greatest following a short period of starvation immediately preceding transfer to these conditions. 3. A meal of filter-paper soaked in sugar solution only, exerts no retarding effect on the rate of attainment of full marching, whilst if an adequate concentration of potassium salt is added in addition a definite retardation is observed. 4. In locusts actively feeding on grass the potassium content of the blood is relatively high, and it is suggested that this causes a reduced muscular efficiency which may explain retardation in attainment of full marching. 5. The marching pattern is the result of the activity of particular nerve centres which require a period of activation by a combination of factors before full expression is achieved. Two final factors are essential for the maintenance of the marching state, a low concentration of blood potassium and mutual stimulation by other marching hoppers.

Operational Aspects of Locust Control

1966 ◽  
Vol 70 (672) ◽  
pp. 1077-1081
Author(s):  
D. Yeo
Keyword(s):  
Schistocerca Gregaria ◽  
Locusta Migratoria ◽  
Broad Band ◽  
Central Africa ◽  
Nomadacris Septemfasciata ◽  
Red Locust ◽  
Migratory Locust ◽  
Locusta Migratoria Migratorioides ◽  
The World ◽  
Locust Control

The crops of every continent of the world have been devastated from time to time by locusts or grasshoppers. To mention three major locust species, the Desert Locust (Schistocerca gregaria Forsk.) has caused havoc in a broad band of the world stretching from East Pakistan to Senegal and from the Mediterranean to Central Africa, the Red Locust (Nomadacris septemfasciata Serv.) has infested East, Central and Southern Africa, and the African Migratory Locust (Locusta migratoria migratorioides Rch. and Frm.) has plagued most of Africa south of the Sahara.What happens in one part of a plague area can significantly affect the situation in others and locust control is therefore an international problem, requiring international co-operation. Many of the threatened areas are countries where standards of living are not high and local agriculture is a mainstay of the economy; the regions are often inhospitable and lack modern roads, aerodromes and lines of communication.

III - Studies on the embyology of the African migratory locust, Locusta migratoria migratorioides Reiche and Frm. (Orthoptera, Acrididae) II - Organogeny

1937 ◽  
Vol 227 (543) ◽  
pp. 175-244 ◽  
Keyword(s):  
Early Development ◽  
Locusta Migratoria ◽  
The Body ◽  
Special Technique ◽  
Present Contribution ◽  
Migratory Locust ◽  
Locusta Migratoria Migratorioides ◽  
Body Segmentation

This paper completes the account of the embryology of Locusta migratoria migratorioides R. and F., which is referred to for brevity as Locusta migratoria , and describes the development of the principal organs of the body. In Part I (Roonwal, 1936, a ) of the present contribution, the early development up to the differentiation of the inner layer and the beginning of the definitive body segmentation was traced in detail. No special technique was employed beyond that already described in the earlier paper.

Changes in the Fat and Protein Content of the African Migratory Locust, Locusta migratoria migratorioides (R. & F.)

1952 ◽  
Vol 43 (1) ◽  
pp. 101-109 ◽  
Author(s):  
S. P. Cheu
Keyword(s):  
Body Weight ◽  
Fat Body ◽  
Locusta Migratoria ◽  
Feeding Activity ◽  
Initial Period ◽  
Adult Life ◽  
Fat Content ◽  
Migratory Locust ◽  
Locusta Migratoria Migratorioides ◽  
Rate Of Increase

The process of build-up of reserve substances in Locusta migratoria migratorioides (R. & F.) is very closely correlated with the feeding activity of the insect. Locusts attain their maximum body weight in the initial period before maturation. In the females there is one minor build-up period after each laying.As measured by the weight of faeces produced, the gregaria female consumes more food than the solitaria during development. It also has a lower rate of increase in body weight, maturation and oviposition.Locusts start to build up fat soon after the final ecdysis. The fat content reaches its maximum in the early part of adult life, and then begins to decline in both sexes of both phases.By far the greater part of the fat reserve thus built up in the gregaria female is used up before oviposition, and only a small amount goes to the making of the first egg-pod. The fat of the subsequent egg-pods (of both phases) is derived from the fat built up each time after a new egg-pod is laid.The solitaria females may mature their eggs at various stages in the development of the fat body. Those which have a longer pre-maturation period have a higher fat content.

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