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Posts tagged ‘lakes’

Something’s Fishy in Yellowstone Lake, Part I

Yellowstone National Park recently announced that it had removed over 300,000 lake trout from Yellowstone Lake during its summer 2012 gill-netting operations.  Yes, that’s three hundred thousand of the non-native, predatory fish pulled out of the lake, all in a single season.  And many of them are real whoppers, like the one held by Park Service fisheries biologist Phil Doepke in the NPS photo at left.

Where did all these lake trout come from?  Why does the park want them gone?  How has the lake trout’s presence in Yellowstone Lake affected other organisms, such as the iconic cutthroat trout? Read more

Seeing Beneath the Surface

I came to Isa Lake to look for tiger salamanders.  But, as I sit on the shore, my eye is instead drawn to the dragonflies and damselflies that flit about, inches above the surface of the pond.  These elongated jewels move with a precision and efficiency that far surpasses any aircraft built by human hands: one cruises steadily with ruthless prowess in pursuit of prey, then pauses to hover, motionless, in defiance of wind and gravity.  The plump, rounded body of a flame skimmer passes by, succeeded by the slender blue needle of a dainty damselfly.  A single dragonfly may eat three hundred mosquitoes in a single day. Read more

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