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--></style><title>Re: [Syrphidae] abundance of Eristalis larvae in
microhabi</title></head><body>
<div><font color="#000000">Dear Grigory</font><br>
<font color="#000000"></font></div>
<div><font color="#000000">One of our students it is working in a
PhD-project about multiple aspects of Eritalis and Eristalinus larval
and imaginal biology relative to artificial breeding. This project
will be defended very soon.</font></div>
<div><font color="#000000">As Francis indicate it is very difficult to
find information about larval densities or intraspecific competition.
We sample in pig farms looking for eristaline larvae (mainly slurry)
and as Wouter indicate, it is really incredible the quantity of larvae
that apparently could develop. We do not know the scale of this
densities but it is sure that also high percentages of mortalities
could exist.</font></div>
<div><font color="#000000"><br></font></div>
<div><font color="#000000">We develop several lab experiments about
this subject with E. tenax and two species of Eristalinus. In the lab
experiments the results indicate that, the effect to increase larval
density causes an increase in the periods of development, a reduction
in the survival and a reduction in final size of the imagoes. This
will be published also soon, but for example densities of 20-40-60 L-1
E. tenax with 200 ml liquid media survive more than 60% in most cases
in some media, but in other cases this percentage reduce until 30% or
less with 100 L-1 initial density...</font></div>
<div><font color="#000000"><br>
Best regards</font><br>
<font color="#000000"></font></div>
<div><font color="#000000">Santos</font><br>
<font color="#000000"></font></div>
<div><font color="#000000">============</font></div>
<div><font color="#000000"><br>
</font><br>
</div>
<blockquote type="cite" cite>Dear Francis and Wouter,</blockquote>
<blockquote type="cite" cite> </blockquote>
<blockquote type="cite" cite>Many thanks for replies! This is very
valuable information for my colleagues from StPeterburg University
(Russia). Indeed, very little data on the density of the Eristalis
larvae in the open literature. Once again very grateful!</blockquote>
<blockquote type="cite" cite> </blockquote>
<blockquote type="cite" cite>Best regards,</blockquote>
<blockquote type="cite" cite>Grigory.</blockquote>
<blockquote type="cite" cite> <br>
***************************************<br>
Grigory V. Popov, Dr, PhD<br>
senior research worker<br>
Section of Population Genetics<br>
Donetsk Botanic Gardens<br>
National Academy of Sciences of Ukraine<br>
Illicha av. 110, 83059 Donetsk<br>
UKRAINE<br>
office +38062-2941280 (fax)<br>
mobile +38050-5638552<br>
https://sites.google.com/site/syrphidaeofukraine/<br>
e-mail mbu@yandex.ru</blockquote>
<blockquote type="cite" cite><br>
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