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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>hi Grigory<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I have just come across another set of larval densities of 'Eristalis tenax' (probably mostly Eristalinus taeniops, to judge from the photo of the reared adults) from Egypt, done in the 1970s right across Egypt, much more extensive than the ones I told you about below. There is a great range of estimates from consistently 0 in some habitats (water tanks) to dense aggregations in places such as drainwater, the drains of slaughterhouses, flooded latrines and seepages (which range from 12 to 85 larvae per 900 cm² water surface).<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The reference is <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Ibrahim IA (1976) Studies on certain myiatic insects. 96pp. MSc Thesis, Department of Entomology, Ain Shams University, Cairo.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Francis<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#1F497D'>Dr Francis Gilbert<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#1F497D'>Associate Professor of Ecology, School of Biology<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#1F497D'>University Park, University of Nottingham, Nottingham NG7 2RD, UK<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#1F497D'>Tel: +44 (0) 115 951 3215<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#1F497D'>website: <a href="www.nottingham.ac.uk/~plzfg">www.nottingham.ac.uk/~plzfg</a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#1F497D'> </span><u><span style='font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#0070C0'>ecology.nottingham.ac.uk<o:p></o:p></span></u></p></div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Gilbert Francis <br><b>Sent:</b> 28 January 2013 19:42<br><b>To:</b> mbu@yandex.ua<br><b>Cc:</b> Hoverfly discussion list<br><b>Subject:</b> RE: [Syrphidae] abundance of Eristalis larvae in microhabitat<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>hi Grigory<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>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-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The reference for this:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>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-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Francis<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#1F497D'>Dr Francis Gilbert<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#1F497D'>Associate Professor of Ecology, School of Biology<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#1F497D'>University Park, University of Nottingham, Nottingham NG7 2RD, UK<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#1F497D'>Tel: +44 (0) 115 951 3215<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#1F497D'>website: <a href="www.nottingham.ac.uk/~plzfg">www.nottingham.ac.uk/~plzfg</a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#1F497D'> </span><u><span style='font-size:8.0pt;font-family:"Tahoma","sans-serif";color:#0070C0'>ecology.nottingham.ac.uk<o:p></o:p></span></u></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> 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></body></html>