<div dir="ltr"><div>Thanks Francis, Axel and Jeroen for the replies.</div><div><br></div><div>Best, Ximo<br><font style="font-family:arial,helvetica,sans-serif" size="2"> <br></font><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr">El lun., 14 ene. 2019 a las 14:08, Jeroen van Steenis (<<a href="mailto:j.van.steenis@xmsnet.nl">j.van.steenis@xmsnet.nl</a>>) escribió:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr"><div dir="ltr">Dear All<div><br></div><div>There is research on finding larval host plants infested with aphids in Episyrphus balteatus see: <a href="https://www.researchgate.net/publication/24024700_What_makes_Episyrphus_balteatus_Diptera_Syrphidae_oviposit_on_aphid_infested_tomato_plants" target="_blank">https://www.researchgate.net/publication/24024700_What_makes_Episyrphus_balteatus_Diptera_Syrphidae_oviposit_on_aphid_infested_tomato_plants</a></div><div><br></div><div>I do not know if they also used males in their experiments. </div><div><br></div><div>Maybe in this paper there are references to it: <a href="https://www.researchgate.net/publication/270497440_Role_of_E-I-farnesene_in_systematic_aphid_prey_location_by_Episyrphus_balteatus_larvae_Diptera_Syrphidae" target="_blank">https://www.researchgate.net/publication/270497440_Role_of_E-I-farnesene_in_systematic_aphid_prey_location_by_Episyrphus_balteatus_larvae_Diptera_Syrphidae</a></div><div><br></div><div>Best wishes,</div><div><br></div><div>Jeroen</div><div><br></div><div><br></div></div></div></div><br><div class="gmail_quote"><div dir="ltr">Op ma 14 jan. 2019 om 13:13 schreef Francis Gilbert <<a href="mailto:Francis.Gilbert@nottingham.ac.uk" target="_blank">Francis.Gilbert@nottingham.ac.uk</a>>:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p class="MsoNormal"><font size="2" face="Calibri" color="#1f497d"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Offhand I don't know of any such paper. Observations
like that would be hard to distinguish from collecting honeydew for food. <u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri" color="#1f497d"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></font></p>
<p class="MsoNormal"><font size="2" face="Calibri" color="#1f497d"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Females visiting flowers for food are probably
non-gravid and so mating them makes sense. Females ready to oviposit have probably already been mated, and so much depends on whether they are prepared to mate again, and if so, what the order of sperm precedence is. I don't know of any work that measures
sperm precedence in syrphids.<u></u><u></u></span></font></p>
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<p class="MsoNormal"><font size="2" face="Calibri" color="#1f497d"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Francis<u></u><u></u></span></font></p>
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<p class="MsoNormal"><font size="1" face="Tahoma" color="#1f497d"><span style="font-size:8pt;font-family:Tahoma,sans-serif;color:rgb(31,73,125)">Dr Francis Gilbert, Professor of Ecology<u></u><u></u></span></font></p>
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<p class="MsoNormal"><b><font size="2" face="Calibri"><span style="font-size:11pt;font-family:Calibri,sans-serif;font-weight:bold" lang="EN-US">From:</span></font></b><font size="2" face="Calibri"><span style="font-size:11pt;font-family:Calibri,sans-serif" lang="EN-US">
<a href="mailto:syrphidae-bounces@lists.nottingham.ac.uk" target="_blank">syrphidae-bounces@lists.nottingham.ac.uk</a> [mailto:<a href="mailto:syrphidae-bounces@lists.nottingham.ac.uk" target="_blank">syrphidae-bounces@lists.nottingham.ac.uk</a>]
<b><span style="font-weight:bold">On Behalf Of </span></b>ximo mengual sanchis<br>
<b><span style="font-weight:bold">Sent:</span></b> 14 January 2019 12:09<br>
<b><span style="font-weight:bold">To:</span></b> Hoverfly discussion list <<a href="mailto:syrphidae@lists.nottingham.ac.uk" target="_blank">syrphidae@lists.nottingham.ac.uk</a>><br>
<b><span style="font-weight:bold">Subject:</span></b> [Syrphidae] Question on males<u></u><u></u></span></font></p>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12pt"><u></u> <u></u></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12pt">Dear all,<u></u><u></u></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12pt"><u></u> <u></u></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12pt">recently a botanist asked me about behavior regarding syrphid males. He did read that some Syrphid males in Europe visit larval host plants with aphids, probably to search
for females (?).<u></u><u></u></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12pt">Do you know any reference or citation about this male behavior?
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12pt">Rotheray and Gilbert (2011, pag. 7) mentioned that "some males patrol flowers when searching for a mate..." but not that those plants are infested with aphids.<u></u><u></u></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12pt">Many thanks in advance.<u></u><u></u></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12pt"><u></u> <u></u></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12pt">Best,<u></u><u></u></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12pt"><u></u> <u></u></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12pt">Ximo<u></u><u></u></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:12pt"><u></u> <u></u></span></font></p>
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