Author Topic: Jellyfish Lake  (Read 836 times)

hubag bohol

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Jellyfish Lake
« on: July 20, 2015, 06:53:48 PM »



One of the world’s most surreal marine migrations happens every single day on an uninhabited island in the South Pacific. Palau’s Jellyfish Lake is one of close to 70 similar bodies of water on the archipelago. Each of those lakes was once connected to the sea, but it’s believed that they were cut off about 12,000 years ago by changing sea levels. In these isolated pockets of water, certain species have learned to thrive by their own rules. That’s why a few of them, like Jellyfish Lake, are packed tighter than a jar of pickles with jellyfish.

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hubag bohol

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Re: Jellyfish Lake
« Reply #1 on: July 20, 2015, 06:55:32 PM »


From dawn until dusk, nearly 13 million golden jellyfish (Mastigias sp.) travel from one end of the lake to the other, then back again in a daily spectacle that most of us have only seen in Finding Nemo. Why? They’re following the Sun. The golden jellyfish in these lakes have developed a symbiotic relationship with a type of zooplankton known as zooxanthellae. These algae-like critters live inside the jellyfish’s tissues and photosynthesize sunlight into energy that the jellyfish can use. So every day, starting bright and early, the swarms of jellyfish head east from the western edge of the lake to catch the first rays of sunlight, then track its arc all the way westward again. There, just beyond the shadows cast by the trees, they settle in for the night and wait for day to break once again.

Interestingly, there’s another factor in this migration, one which might have caused it in the first place. The shores of the lake are packed with white sea anemones that will happily snag a passing jellyfish, but these immobile creatures only grow in the shade. If the jellyfish stay in the light, they’re safe, but straying too close to the shadows virtually ensures a quick, brutal end. -- http://listverse.com/




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hubag bohol

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Re: Jellyfish Lake
« Reply #2 on: July 20, 2015, 07:15:04 PM »
...than to speak out and remove all doubt." - Abraham Lincoln

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