Effects of diapause and cold acclimation on egg ultrastructure: new insights into the cold hardiness mechanisms of the Asian tiger mosquito Aedes (Stegomyia) albopictus
| Autor: | Jörg Oehlmann, Ruth Müller, Aljoscha Kreß, Ulrich Kuch |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
0301 basic medicine
Aedes albopictus Cuticle Acclimatization 030231 tropical medicine Population Zoology Mosquito Vectors Diapause 03 medical and health sciences 0302 clinical medicine Aedes Botany Cold acclimation Animals education Ecology Evolution Behavior and Systematics Ovum education.field_of_study Ecology biology fungi biology.organism_classification Cold Temperature 030104 developmental biology Hardiness (plants) Introduced Species |
| Zdroj: | Journal of vector ecology : journal of the Society for Vector Ecology. 41(1) |
| ISSN: | 1948-7134 |
| Popis: | The Asian tiger mosquito, Aedes albopictus (Diptera: Culicidae, SKUSE), is an important threat to public health due to its rapid spread and its potential as a vector. The eggs of Ae. albopictus are the most cold resistant life stage and thus, the cold hardiness of eggs is used to predict the future occurrence of the species in distribution models. However, the mechanism of cold hardiness has yet to be revealed. To address this question, we analyzed the layers of diapausing and cold acclimatized eggs of a temperate population of Ae. albopictus in a full factorial test design using transmission electron microscopy. We reviewed the hypotheses that a thickened wax layer or chorion is the cause of cold hardiness but found no evidence. As a result of the induced diapause, the thickness of the dark endochorion as a layer of high electron density and thus an assumed location for waxes was decreasing. We therefore hypothesized a qualitative alteration of the wax layer due to compaction. Cold acclimation was causing an increase in the thickness of the middle serosa cuticle indicating a detachment of serosa membrane from the endochorion as a potential adaptation strategy to isolate inoculating ice formations in the inter-membranous space. |
| Databáze: | OpenAIRE |
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