Gallery Links
Users Online
· Guests Online: 13

· Members Online: 0

· Total Members: 3,718
· Newest Member: jayaento
Paul Beuk's Book Reviews
Newest books:
· The European fami...
· De Nederlandse zw...
· The Diptera of th...
Most popular books:
· The Diptera of th...
· De Nederlandse zw...
· The European fami...

Looking for something in particular?
Use search!
Forum Threads
Newest Threads
· Culicidae?
· Id please
· Id please
· Id please
· Id please
Hottest Threads
· Portraits of amat... [338]
· Fly bubble blowing [168]
· Ariasella lusitan... [105]
· Pinning flies and... [94]
Theme Switcher
Switch to:
Last Seen Users
· paolofon< 5 mins
· Nosferatumyia00:06:23
· Woodmen01:54:34
· mmmsoares04:59:22
· John Carr05:01:17
· Oscar05:13:29
· Tony Irwin05:52:38
· tlegrand06:56:26
· PhilC06:58:30
· thijsdegraaf07:34:15
Latest Photo Additions
Mating behaviour and courtship in Hercostomus germanus
The observations of the behaviour described here were made in a 3-4 day period at the end of July 2009. Two days in a row I noticed small flies hovering over almost every umbelliferous flower in my neighbourhood, both small ones close to the ground, and large ones, in gardens and in the woods. After the first two days the activity diminished and later no more flies were seen.

The male fly hovered 3-10 cm above the flower, constantly changing direction and altitude. Its movements almost resembled a dance. Sometimes it would concentrate hovering for a while over a female (which seemed oblivious to the presence of the male). Most of the time the males were hovering but occasionally they would take breaks resting on the flower or proximate vegetation. Often in the higher parts. As mentioned, the females seemed oblivious to the presence of a male and were constantly foraging on the flowers. There's no way I can tell if the female gave the male a 'go' or if it was the male's orientation to the female that made the male plunge in and seemingly attack the female.
Most attempts seemed to be unsuccessful as the male was quickly thrown off, and the female continued her foraging. I do not know if these instances resulted in successful fertilization.
At other times the male hovered over the female more concentrated and he took more time to produce a package of sperm which he held ready for quite some time before diving, and copula was achieved. I could not observe them beyond this point as they flew away from the flower in copula and disappeared into the nearby vegetation.
On flowers with several males and females there seemed to be no organisation in which male courted which female. However, males would chase each other if they came too close.
I estimate that there were 2-4 females and equal number of males on an umbel measuring 20-30 cm in diameter, the number of flies being relative to the umbel's size. Small ones, for example 5 cm in diameter, usually had one of each sex.
It seemed that weather or time of day did not play any part in courtship. Of course, I cannot say whether or not the actual successful mating was influenced by such. My observations of matings were made in the evening with light rain.

Many thanks to Paul Beuk for encouragement and editing, and to Igor Grichanov for species identification.
 
January 7th, 2010

Hakon Haraldseide
Norway
Comments
No Comments have been Posted.
Post Comment
Please Login to Post a Comment.
Ratings
Rating is available to Members only.

Please login or register to vote.

No Ratings have been Posted.
Date and time
24 April 2017 07:23
Login
Username

Password



Not a member yet?
Click here to register.

Forgotten your password?
Request a new one here.
Temporary email?
Due to fact this site has functionality making use of your email address, any registration using a temporary email address will be rejected.

Paul
Donate
Please, help to make
Diptera.info
possible and enable
further improvements!
Latest Articles
Syrph the Net
Those who want to have access to the Syrph the Net database need to sign the
License Agreement -
Click to Download


Public files of Syrph the Net can be downloaded HERE

Last updated: 25.08.2011
Shoutbox
You must login to post a message.

21.04.17 15:08
Thanks very much Paul

18.04.17 20:24
Nice occur on the Dutch television Paul!

11.04.17 13:37
In Dutch some would use it as plural, for 'exemplaar' (exemplar or specimen). Ten exx. then is ten specimens.

10.04.17 16:21
Thanks Phil I am thinking exuviae but I can't find the abbrev. so perhaps so

09.04.17 12:25
I haven't come across it but I suspect it means 'examples'.

08.04.17 11:27
Hell has anyone come across the meaning of exx? and what it means

01.04.17 11:43
Thanks very much

25.03.17 21:53
Ibid. is short for Latin ibidem, meaning 'in the same place', so = 'same as the previous reference'. Smile

25.03.17 13:09
Cab any1 help out with the full name if the journal IBID Thx

16.03.17 12:41
Hello, can anyone help out a French translation regarding the larva - excroissances, is it protuberance? Thx

Render time: 0.03 seconds | 123,177,781 unique visits