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From: lonetto@phri.UUCP (Michael Lonetto)
Newsgroups: net.origins
Subject: Re: Salt Water Taffy
Message-ID: <384@phri.UUCP>
Date: Tue, 6-Aug-85 20:51:26 EDT
Article-I.D.: phri.384
Posted: Tue Aug  6 20:51:26 1985
Date-Received: Mon, 12-Aug-85 01:50:46 EDT
References: <1337@uwmacc.UUCP>
Distribution: net
Organization: Public Health Research Inst. (NY, NY)
Lines: 42

> 
> J Chervinski, "Salinity tolerance of the guppy, _Poecilia reticulata_
> Peters", J Fish Biology, 24(4), April 1984, 449-452.
> 
>      Table 1.  Mortality of _Poecilia reticulata_ (%) after direct
>      transfer from fresh water to various saline concentrations
> 
>   			              Mortality at various
> 			           concentrations of sea water
>          Time from start of
>          experiment (h)           0%    50%    60%   70%   90%
>          -----------------------------------------------------
>            8                      0      0      0    20   100
>           24                      0      0     10   100
>           48                      0      0     20
>           72                      0      0     20
>           96                      0      0     20
>          120                      0      0     20
>          144                      0      0     20
>          168                      0      0     20
> 
> The practical significance of this work is that brackish water and salt
> marshes are favorable mosquito breeding habitats.  Stocking of guppies,
> which feed on the mosquito larvae, is thus a pest control measure.
> 
> The significance may also extend to some of the discussion in this
> newsgroup...I thought that perhaps some of the readers might be
> interested.

Very interesting.  What does it have to do with evolution?  The guppies
don't "evolve" in 168 hours.  They already have the ability to live in
salt water.  Swamp fish tend to be very adaptable with regard to water
quality.  Is that the evolution you refer to?  Please be more specific.

-- 
____________________

Michael Lonetto  Public Health Research Institute,
455 1st Ave, NY, NY 10016  
(allegra!phri!lonetto)

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