Category Archives: Mating

Jumping Spider Melodies — Dr. Wayne Maddison

Well, it is finally here.

In November of  2012, the Joint Annual Meeting of the Entomological Society of Canada and the Entomological Society of Alberta kicked off with a great plenary symposium on Arthropod Biodiversity. The speakers were uniformly excellent, featuring Dr. Daniel Rubinoff on The evolution of extraordinary biodiversity in Hawaii’s endemic insects, followed by Dr. Jeremy Kerr on Detecting and predicting global impacts on butterflies in Canada and then closing with a most delightful talk by Dr. Wayne Maddison on “Jumping Spider Melodies“.  Even before I had finished packing up the equipment, I was approached by the fly-guy, Morgan Jackson, saying that his tweets had resulted in requests for some way to access a recording of the talk on Jumping Spiders. With Dr. Maddison’s permission, and with his Power Point slides, I stitched together the following video. Final permissions from Dr.Damian Elias came in last week, so the video is now ready for viewing. Although the video quality is not great, the content is fascinating!

From the printed introduction to the lecture:

The beautiful diversity of jumping spiders holds patterns that are replicated across phylogeny. In the genus Habronattus, multiple evolutionary origins of Y sex chromosomes are associated with distal chiasmata, supporting a proposed constraint hypothesis. In the family as a whole, large-scale evolutionary radiations have occurred in different continental regions independently, yielding similar spectra of body forms and ecologies in each region.

(Any errors in the following reconstruction are my own: please notify me of any problems in the comments)

Please see the supplementary videos and charts…. Continue reading »

Also posted in Alberta, Arachnid, Araneae, Behaviour, Biodiversity, Canada, Entomological Society of Alberta, Entomological Society of Canada, evolution, Joint Annual Meeting, Salticidae, Science, Video | Tagged , , , | 12 Comments

Mating Hoverflies on Black

"Mating Syrphid flies"

This pair of hover flies (Syrphidae, possibly Allograpta obliqua Genus Sphaerophoria¹) stand out strongly against a black background. In the days of film, when many cameras only had a flash sync. speed of 1/60 sec., and you were shooting with low ISO film, almost all backgrounds would be black, unless your subject was positioned very near the background. In this case, the flies were resting on a stem in front of a very cluttered background on a shaded grassy verge beside a stream. Using a handheld camera with a 180mm macro lens, rapid light fall-off from a strong flash overpowered the daylight ensuring that the subject was correctly exposed while the background remained dark. (ISO 400, 1/200 sec. @f13)

What else makes this image work? The eyes of both flies are at the intersection of thirds–the (simplified) golden rule guideline of design.

¹Edited on the 18 December, 2011. ID by Martin Hauser at BugGuide.

Also posted in Composition, Diptera, macro, photography, Summer, Syrphidae | Tagged , , , , | Leave a comment

Sunday Bugfest 5

Another buggy selecton of science and photography articles discovered in the last week:

Science:
◊ What’s a young male spider to do when his mate ain’t of age? Learn more about the pro’s and con’s of mock sex in Anelosimus studiosus spiders at Inkfish. Based on the study: Non-Conceptive Sexual Behavior in Spiders: A Form of Play Associated with Body Condition, Personality Type, and Male Intrasexual Selection.

◊ Rather Victorian, but some can still entice with soft silk and lace work...

◊ Male euglossine bees collect scents from their environment and store them in special structures on their legs. These collected scents are believed to be used to attract female bees. Some orchids seem to have evolved to lure male bees by producing these scents, and when they come in to collect, the orchid then connects them to a pollen package–ripe for dispersal to other orchids. It seems mutually beneficial but sometimes nothing in biology makes sense…’cos timing is everything.

◊ A. aegypti mosquitoes are the day-flying carriers of dengue fever, and are therefore not affected by the use of bed nets. A recent field study has shown that bio-engineered Aedes aegypti mosquitoes, which have been modified to produce offspring that die before reproduction, have been successfully used to breed with wild mosquitoes. Read more on this at the Oxford Science Blog, and see the study at Nature Biotechnology.

And post-Halloween Zombie Science continues…
◊ The  zombie meme has not ended: see how viruses manipulate their caterpillar hosts for maximum transimison in Zombie Insects: A Q&A about a Sinister Virus, then read a revived post by Bora Zivkovic, on the Revenge of the Zombifying Wasp.

◊ Not satisfied with  these zombie tales? Check out how a forensic entomologists can determine how long a body has been above ground before being buried in Digging Up Clues: Research On Buried Blow Flies Will Help Crime Scene Investigators.

◊ Still not satiated? Need more bizarre? See how your Facebookfriends‘ and cannibalism are connected in What Social Media Reveals About Cannibalistic Locusts! Then read Adaptive-network models of swarm dynamics for the whole shebang.

Phototograhy
◊ I have a dream…since my discovery of the pleasures of photomacrography, I have longed to make an extended trip into the torrid zone so I can explore the amazing biodiversity with my camera. Here is someone who lives the life: a how-to article on rain forest macro photography by Greg Basco, who lives and works in Costa Rica. Great nature photography!

◊ Michael Erlewine is an amazing photographer who has been with macro since 1956! A Nikon user, and a lover of lenses, he has produced a number of free e- books on photomacrography. Click images for pdfs and…

…visit his webpage at MacroStop for more.


Art
◊ Many who visit this blog use photography to capture images of insects, but others connect with the bug world in different ways. Visit Pencil and Leaf for a view of how an artist develops a painting featuring the snail-shell nesting Osmia bicolour bees.

Also posted in Blog Link, Entomology, Equipment, invertebrates, macro, photography, Roundup, Video, Web LInk | Tagged , , , , , , , | 1 Comment

Common, but worth a second look.

The cabbage white (Pieris rapae) is often held in disdain–an old world butterfly that plagues farmers and gardeners who dare to grow cabbage or broccoli. But seen up close they are more than just a pest, more than just a ‘white’ butterfly. The pale yellow-green underwings, peppered with tiny spots, have a delicate beauty all of their own.

And who can’t appreciate those speckled grey-green eyes?

N.B – Coincidentaly, Blackbird out at BugBlog has also posted on P. rapae today. Visit Small white or small ultraviolet butterfly? for more info. on  the science of what female cabbage whites find attractive in a mate. A  cool photograph of a bilateral gynandromorph is also featured.

(Photographed in the garden on golden ninebark, Physocarpus opulifolius ‘Dart’s Gold’)

Also posted in Alberta, close-up, Insect, Lepidoptera, Pieridae, Summer | Tagged , , , , , | 1 Comment