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<DIV style="FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: 12pt">
<DIV>Hi Gregory,</DIV>
<DIV> </DIV>
<DIV>I have seen Eristalis tenax and Eristalinus aeneus emerging from a liquid
manure storage. We found hunderds of E. tenax emerged from a storage beneath a
cowshed of maybe 200 m2. Probably we saw only part of the flies. So that is at
the very least one emerging fly per day per m2. I could not see how many larvae
were in the manure, but that will have been many many more.</DIV>
<DIV> </DIV>
<DIV>Myathropa florea could reach comparable densities in little pools at the
base of beech Fagus sylvaticus. In a little waterbody of 20*20 cm and 10 cm deep
you could find several larvae. So that is in the lower range of the numbers
Francis gives.</DIV>
<DIV>No literature references, just my own observations.</DIV>
<DIV> </DIV>
<DIV>Wouter</DIV>
<DIV> </DIV>
<DIV>Wouter van Steenis</DIV>
<DIV>Vogelmelk 4</DIV>
<DIV>3621 TP Breukelen</DIV>
<DIV>The Netherlands</DIV>
<DIV>+31 (0) 346 264671</DIV>
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<DIV> </DIV>
<DIV style="BACKGROUND: #f5f5f5">
<DIV style="font-color: black"><B>From:</B> <A
title=Francis.Gilbert@nottingham.ac.uk
href="mailto:Francis.Gilbert@nottingham.ac.uk">Francis Gilbert</A> </DIV>
<DIV><B>Sent:</B> Monday, January 28, 2013 8:42 PM</DIV>
<DIV><B>To:</B> <A title=mbu@yandex.ua
href="mailto:mbu@yandex.ua">mbu@yandex.ua</A> </DIV>
<DIV><B>Cc:</B> <A title=syrphidae@lists.nottingham.ac.uk
href="mailto:syrphidae@lists.nottingham.ac.uk">Hoverfly discussion list</A>
</DIV>
<DIV><B>Subject:</B> [Syrphidae] Re: abundance of Eristalis larvae in
microhabitat</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none">
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<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">hi
Grigory<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">I
have not come across any proper estimates of larval densities in the field for
Eristalis tenax. There are some for other Eristalis and Eristalinus
species in Egypt from monthly surveys in, for example, sewage settling ponds.
These vary from about 3 to about 60 larvae per 900 cm² surface in a gravel-bed
hydroponic system where the water is 30 cms deep. This is about 30 to 650 larvae
per m² water surface.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">The
reference for this:<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">Mahmoud
MAM (1997) Ecological and microbiological studies on syrphid larvae inhabiting
sewage water. MSc Thesis, Faculty of Science, Suez Canal University, Egypt. 149
pp. (in English with arabic abstract)<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt">Francis<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; FONT-SIZE: 11pt"><o:p></o:p></SPAN> </P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: #1f497d; FONT-SIZE: 8pt">Dr
Francis Gilbert<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: #1f497d; FONT-SIZE: 8pt">Associate
Professor of Ecology, School of Biology<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: #1f497d; FONT-SIZE: 8pt">University
Park, University of Nottingham, Nottingham NG7 2RD, UK<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: #1f497d; FONT-SIZE: 8pt">Tel:
+44 (0) 115 951 3215<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: #1f497d; FONT-SIZE: 8pt">website:
<A
href="wlmailhtml:www.nottingham.ac.uk/~plzfg">www.nottingham.ac.uk/~plzfg</A><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: #1f497d; FONT-SIZE: 8pt">
</SPAN><U><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: #0070c0; FONT-SIZE: 8pt">ecology.nottingham.ac.uk<o:p></o:p></SPAN></U></P>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; COLOR: #1f497d; FONT-SIZE: 10pt"><o:p></o:p></SPAN> </P>
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<DIV
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<P class=MsoNormal><B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt"
lang=EN-US>From:</SPAN></B><SPAN
style="FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt" lang=EN-US>
syrphidae-bounces@lists.nottingham.ac.uk
[mailto:syrphidae-bounces@lists.nottingham.ac.uk] <B>On Behalf Of </B>Popov
Grigory<BR><B>Sent:</B> 28 January 2013 17:49<BR><B>To:</B>
syrphidae@lists.nottingham.ac.uk<BR><B>Subject:</B> [Syrphidae] abundance of
Eristalis larvae in microhabitat<o:p></o:p></SPAN></P></DIV>
<P class=MsoNormal><o:p></o:p> </P>
<DIV>
<P class=MsoNormal><SPAN lang=EN>Hi, friends,</SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><SPAN lang=EN><BR>Please, can anyone tell what is the maximum
(and "normal") density of Eristalis tenax larvae in nature microhabitat (may be
with literature references)?</SPAN><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal>In "The Natural History of Hoverflies" there are
no...<o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal> <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal>Best regards, Grigory Popov.<o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><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<o:p></o:p></P></DIV></DIV><BR><BR><BR>
<P>
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