Monday, August 28, 2006

Sagehen Video thumbnail archive

This post automatically updates itself periodically to show thumbnails of every video on the Sagehen v-log, even the ones no longer visible on the main page. Click on a thumbnail to go to the video.

Or use this link to see a page with every Sagehen video we have, no matter whether it's hosted on our server, on YouTube, or on Vimeo.



Video archive by Mefeedia

Sunday, August 27, 2006

Pirates of Sagehen Basin!

Ant researcher, photographer & author Mark Moffett gets interested in Sagehen's slave-raiding ants. Why do the slaves put up with it? Same reason people do--because they don't know any better. They hatch out into the red ant nest & just assume that's where they belong. Watch here.

00:08:57 [13.7 MB]

Slave-making has evolved in ants nine separate times, so it apparently works.

Polyergus breviceps are obligate social parasites, meaning that they simply can't live without their slaves: they have lost the ability to dig tunnels, gather food, care for their babies. All they do is hang around, being taken care of until it's time to go out on another raid.

The video shows Polyergus breviceps [red ants] stealing brood [eggs & pupae] from nests of the host species, Formica argentea [black ants].

Many stages of a raid are shown: the nest before a raid with no red ants apparent [they don't work except to raid]; the initial red scout heading out, the red column advancing; winged red reproducers accompanying the column & mating along the way; black ants trying to block the entrances to their home; red ants unblocking the entrance, then taking brood from the target nest; racing back to the home nest where the black ants take over care & sometimes carry or drag the exhausted red ants.

The new black brood will hatch out & acquire the scent of the new home nest, then go right to work taking care of the red queen's eggs.

Meanwhile, the mated reproducers will lose their wings & attempt to find a black ant nest then kill its black queen, taking over egg laying duties & converting the nest to a red ant nest with black slaves. There will be no more black ant eggs produced in these attacked nests.

A little creepy, eh?



Download this short ants reel here
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Thursday, August 17, 2006

Sagehen Summer Speaker Series #10: Plant Communication

7-29-06: Professor Rick Karban of UC Davis keeps the crowd enrapt with discussion of his controversial research showing that plants exchange information with each other in response to predators (but you don't have to call it "communication" if that idea bothers you!).

00:49:40 [34.5 MB] or watch below...

Plant Communication from F. Felix on Vimeo.

Thursday, August 10, 2006

Sagehen Experimental Forest Dedication Ceremony, June 24, 2006

The Sagehen Experimental Forest Dedication ceremony was held at Sagehen Creek Field Station on June 24, 2006. A number of important people from the Forest Service & UC Berkeley spoke at this historic occasion, making a number of interesting observations about the purpose & potential of the Sagehen Experimental Forest. Watch here.
00:52:40 [62.8 MB]

Read about the Sagehen Experimental Forest dedication here.