1. rhamphotheca: Spiders Hunt with 3-D Vision by Elsa Youngsteadt With their keen vision and deadly-accurate pounce, jumping spiders are the cats of the invertebrate world. For decades, scientists have puzzled over how the spiders’ miniature nervous systems manage such sophisticated perception and hunting behavior. A new study of Adanson’s jumping spider (Hasarius adansoni) fills in one key ingredient: an unusual form of depth perception. Like all jumping spiders, the Adanson’s spider has eight eyes. The two big ones, front and center on the spider’s “face,” have the sharpest vision. They include a lens that projects an image onto the retina—the light-sensitive tissue at the back of the eye. That much is common in animal vision, but the jumping spider’s retina takes things a step further: It consists of not one but four distinct layers of light-sensitive cells. Biologists weren’t sure what all those layers were for, and research in the 1980s made them even more enigmatic. Studies showed that whenever an object is focused on the base layer, it is out of focus on the next layer up—which would seem to make the spider’s vision blurrier rather than sharper… (read more: Science NOW)     (image: Science AAAS)

    rhamphotheca:

    Spiders Hunt with 3-D Vision

    by Elsa Youngsteadt

    With their keen vision and deadly-accurate pounce, jumping spiders are the cats of the invertebrate world. For decades, scientists have puzzled over how the spiders’ miniature nervous systems manage such sophisticated perception and hunting behavior. A new study of Adanson’s jumping spider (Hasarius adansoni) fills in one key ingredient: an unusual form of depth perception.

    Like all jumping spiders, the Adanson’s spider has eight eyes. The two big ones, front and center on the spider’s “face,” have the sharpest vision. They include a lens that projects an image onto the retina—the light-sensitive tissue at the back of the eye. That much is common in animal vision, but the jumping spider’s retina takes things a step further: It consists of not one but four distinct layers of light-sensitive cells. Biologists weren’t sure what all those layers were for, and research in the 1980s made them even more enigmatic. Studies showed that whenever an object is focused on the base layer, it is out of focus on the next layer up—which would seem to make the spider’s vision blurrier rather than sharper…

    (read more: Science NOW)     (image: Science AAAS)

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I'm in love with Mother Nature. Watcha gonna do 'bout it? I'm an Environmental Science and Spanish double major at the University of Central Arkansas Honors College. I would like to work with meteorology (weather), climate, diseases, and the environment. I'd like to research how the weather and climate affects the spread of diseases and the role and impact it has on the environment. I'm interested in meteorology, earth sciences, environmental science, paleontology, ecology, ultimate frisbee, deep ecology, science as a whole, and tea. There's honestly a lot more but why don't you just see what all I post. This is a rough and short description of, well, me! Josh Bregy!
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