issue 8 - Rachel Forero March 8, 2007 Marine Bio Issue 8...

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Rachel Forero March 8, 2007 Marine Bio Issue 8 Issue Disscussion 1. What enables the blue whale to grow so large? The blue whale feeds directly on krill, which are very abundant, especially in Antarctic waters, and in feeding directly on them, blue whales get a greater amount of the krill’s nutrients. 2. Why is the Antarctic marine ecosystem so productive? The marine ecosystem is so productive because of the Circumpolar Deep water, which is southerly flowing deep, nutrient-rich water. 3. What are krill, and why are they considered a ‘keystone species’? Krill are shrimp-like, filter feeding crustraceans that feed on diatoms. They area ‘keystone species” because of their abundance and importance in ecosystems. 4. What are threats to the Antarctic marine ecosystem? Global warming poses the greatest threat to the Antarctic marine ecosystem, and overfishing in other areas of the world could lead to greater reliance, and depletion, of Antarctic krill fisheries. Analysis 1
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This note was uploaded on 04/18/2008 for the course MSC 205 taught by Professor Lynch during the Spring '07 term at California Maritime Academy.

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issue 8 - Rachel Forero March 8, 2007 Marine Bio Issue 8...

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