[Syrphidae] Re: Question on males

[ximo mengual sanchis]

Thanks Francis, Axel and Jeroen for the replies.

Best, Ximo




El lun., 14 ene. 2019 a las 14:08, Jeroen van Steenis (<
j.van.steenis at xmsnet.nl>) escribió:

> Dear All
>
> There is research on finding larval host plants infested with aphids in
> Episyrphus balteatus see:
> https://www.researchgate.net/publication/24024700_What_makes_Episyrphus_balteatus_Diptera_Syrphidae_oviposit_on_aphid_infested_tomato_plants
>
> I do not know if they also used males in their experiments.
>
> Maybe in this paper there are references to it:
> https://www.researchgate.net/publication/270497440_Role_of_E-I-farnesene_in_systematic_aphid_prey_location_by_Episyrphus_balteatus_larvae_Diptera_Syrphidae
>
> Best wishes,
>
> Jeroen
>
>
>
> Op ma 14 jan. 2019 om 13:13 schreef Francis Gilbert <
> Francis.Gilbert at nottingham.ac.uk>:
>
>> Offhand I don't know of any such paper. Observations like that would be
>> hard to distinguish from collecting honeydew for food.
>>
>>
>>
>> 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.
>>
>>
>>
>> Francis
>>
>>
>>
>> Dr Francis Gilbert, Professor of Ecology
>>
>> Room B132, Life Sciences Building, School of Life Sciences
>>
>> University Park, University of Nottingham, Nottingham NG7 2RD, UK
>>
>> Tel: +44 (0) 115 951 3215
>>
>> website: www.nottingham.ac.uk/~plzfg
>>
>>                 *ecology.nottingham.ac.uk
>> <http://ecology.nottingham.ac.uk>*
>>
>>
>>
>> [image: logo200]
>>
>>
>>
>> *From:* syrphidae-bounces at lists.nottingham.ac.uk [mailto:
>> syrphidae-bounces at lists.nottingham.ac.uk] *On Behalf Of *ximo mengual
>> sanchis
>> *Sent:* 14 January 2019 12:09
>> *To:* Hoverfly discussion list <syrphidae at lists.nottingham.ac.uk>
>> *Subject:* [Syrphidae] Question on males
>>
>>
>>
>> Dear all,
>>
>>
>>
>> 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 (?).
>>
>>
>>
>> Do you know any reference or citation about this male behavior?
>>
>> 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.
>>
>>
>>
>> Many thanks in advance.
>>
>>
>>
>> Best,
>>
>>
>>
>> Ximo
>>
>>
>>
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>
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