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Read e-book online Biology of Blood-Sucking Insects PDF

By M. J. Lehane (auth.)

ISBN-10: 9401179530

ISBN-13: 9789401179539

ISBN-10: 9401179557

ISBN-13: 9789401179553

Blood-sucking bugs are the vectors of a few of the such a lot debilitating parasites of guy and his domesticated animals. additionally they are of substantial direct fee to the rural via losses in milk and meat yields, and during harm to hides and wool, and so on. So, no longer strangely, many books of scientific and veterinary entomology were written. almost all these texts are geared up taxonomically giving the main points of the life-cycles, bionomics, dating to sickness and monetary value of every of the insect teams in flip. i've got taken a special procedure. This booklet is subject led and goals to debate the organic topics that are universal within the lives of blood-sucking bugs. to do that i've got targeting these features of the biology of those attention-grabbing bugs that have been sincerely changed in a roundabout way to fit the blood-sucking behavior. for instance, i've got mentioned feeding and digestion in a few aspect simply because feeding on blood offers bugs with specified difficulties, yet i have never mentioned breathing since it isn't affected in any specific approach via haematophagy. evidently there's a subjective aspect within the number of subject matters for dialogue and the load given to every. i am hoping that i have never permit my enthusiasm for specific topics get the higher of me on too many events and that the subject matter achieves an total balance.

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Extra info for Biology of Blood-Sucking Insects

Example text

Aegypti (Mukwaya 1977). These species showed direct evidence of zoophilic and anthropophilic populations both in the laboratory and the field. It was established that single species were involved when no crossing or hybrid sterility appeared during crossing and backcrossing experiments. 2 HOST CHOICE AND SPECIES COMPLEXES For most blood-sucking insects the spectrum of host choice differs with changing place and season and given different proportions of available hosts. Selective adaptation to such changes in local circumstance is the factor driving speciation.

The lower edge of the 'attraction range' shown in the figure is the furthest trapping point at which an effect of the carbon dioxide was noted. The upper edge of the zone is the nearest trap at which no effect of the carbon dioxide was seen. 1 % in dense vegetation at night. 5% carbon dioxide. So a plume produced from a solitary human would remain above background until the exhaled breath had been diluted by a factor of about 100 (Gillies 1980). Predicting how dilution of the plume will occur is no easy task.

Let us look at one example of the complexity of behavioural responses to a visual signal. Tsetse flies are drawn to UV light sources (Green & Cosens 1983), but are repelled by UV-reflecting surfaces as shown by the reduced efficiency of traps covered with them (Green 1989). So whether the light is presented as a point source or a surface can be important. Things are even more complicated because the response to the same stimulus can vary under different behavioural conditions. So while UV-reflecting surfaces are repellent during orientation of the tsetse fly to a trap, the same surfaces promote landing if the fly arrives in the trap's immediate vicinity (Green 1989).

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Biology of Blood-Sucking Insects by M. J. Lehane (auth.)


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