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The distribution of hatching time in Anopheles gambiae.

Abstract：

BACKGROUND:Knowledge of the ecological differences between the molecular forms of Anopheles gambiae and their sibling species, An. arabiensis might lead to understanding their unique contribution to disease transmission and to better vector control as well as to understanding the evolutionary forces that have separated them. METHODS:The distributions of hatching time of eggs of wild An. gambiae and An. arabiensis females were compared in different water types. Early and late hatchers of the S molecular form were compared with respect to their total protein content, sex ratio, development success, developmental time and adult body size. RESULTS:Overall, the distribution of hatching time was strongly skewed to the right, with 89% of the eggs hatching during the second and third day post oviposition, 10% hatching during the next four days and the remaining 1% hatching over the subsequent week. Slight, but significant differences were found between species and between the molecular forms in all water types. Differences in hatching time distribution were also found among water types (in each species and molecular form), suggesting that the eggs change their hatching time in response to chemical factors in the water. Early hatchers were similar to late hatchers except that they developed faster and produced smaller adults than late hatchers. CONCLUSION:Differences in hatching time and speed of development among eggs of the same batch may be adaptive if catastrophic events such as larval site desiccation are not rare and the site's quality is unpredictable. The egg is not passive and its hatching time depends on water factors. Differences in hatching time between species and molecular forms were slight, probably reflecting that conditions in their larval sites are rather similar.

journal_name

Malar J

journal_title

Malaria journal

authors

Yaro AS,Dao A,Adamou A,Crawford JE,Ribeiro JM,Gwadz R,Traoré SF,Lehmann T

doi

10.1186/1475-2875-5-19

keywords:

subject

Has Abstract

pub_date

2006-03-22 00:00:00

pages

19

issn

1475-2875

pii

1475-2875-5-19

journal_volume

5

pub_type

杂志文章

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