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The Evolution of Increased Salinity Tolerance in Larvae of Aedes Mosquitoes: A Phylogenetic Analysis

Wesley B. Grueber and Timothy J. Bradley
Physiological Zoology
Vol. 67, No. 3 (May - Jun., 1994), pp. 566-579
Stable URL: http://www.jstor.org/stable/30163758
Page Count: 14
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Evolution of Increased Salinity Tolerance in Larvae of Aedes Mosquitoes: A Phylogenetic Analysis
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Abstract

The osmoregulatory abilities of the larvae of two species of mosquito, Aedes nigromaculis and Aedes melanimon, were examined. Both species are closely related to known saline-tolerant species. We examined the saline tolerance of these two species by performing survival tests in water ranging from 10% to 100% seawater. Aedes nigromaculis showed increased mortality above 30% seawater, while A. melanimon showed high rates of survival in all salinities tested. Fluorescence and electron microscopic studies reveal the presence of a single rectal segment in A. nigromaculis larvae, as is characteristic of obligate freshwater species, and two distinct rectal segments in A. melanimon, as is characteristic of euryhaline osmoconforming larvae. Information on the physiological capacities of these two species, along with a similar knowledge of other key species, allowed us to map physiological information on a previously established phylogeny. Our results demonstrate the usefulness of physiological and morphological information in elucidating the evolutionary history of this group.

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