Translator Disclaimer
1 December 2013 Resistance to Freezing Temperatures in Aedes (Ochlerotatus) Albifasciatus (Macquart) Eggs (Diptera: Culicidae) from Two Different Climatic Regions of Argentina
Author Affiliations +
Abstract

Aedes (Ochlerotatus) albifasciatus (Macquart) has the capacity to proliferate in different kinds of climates within its distribution range in South America. With the aim of studying local thermal adaptations of eggs, we exposed egg stocks from two climatically different localities: temperate humid pampa (Buenos Aires) and cold arid Patagonian (Sarmiento), to freezing conditions and then evaluated the effect on some features at this level. First, we thermally described the substrate where this species lays its eggs in the arid region. A typical thermal condition during winter was 10 h at -12° C. Second, we evaluated the effect of freezing on primary hatching (vs total hatching) and embryo survival. We also compared the proportion of embryonated eggs from both populations. The proportions of embryonated eggs were not different between localities, with averages of 78% and 83% in Sarmiento and Buenos Aires, respectively. Survival was equally successful after freezing in the two localities with an average range between 94–99%. Whether or not the eggs from Buenos Aires and Sarmiento were under freezing conditions, hatching was more than 98% after the first flooding. The results suggest that eggs of Ae. albifasciatus from Sarmiento and Buenos Aires have the same ability to survive at extreme temperatures (<0° C), showing a regional thermal adaptation rather than a local one.

M. J. Garzón, O. Jensen, and N. Schweigmann "Resistance to Freezing Temperatures in Aedes (Ochlerotatus) Albifasciatus (Macquart) Eggs (Diptera: Culicidae) from Two Different Climatic Regions of Argentina," Journal of Vector Ecology 38(2), 339-344, (1 December 2013). https://doi.org/10.1111/j.1948-7134.2013.12049.x
Received: 8 April 2013; Accepted: 1 June 2013; Published: 1 December 2013
JOURNAL ARTICLE
6 PAGES

This article is only available to subscribers.
It is not available for individual sale.
+ SAVE TO MY LIBRARY

SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top