Sea urchins reproduce by releasing eggs and sperm directly into the surrounding seawater. Under acidified conditions the sperm of some sea urchins swim more slowly,49 which reduces their chances of finding and fertilizing an egg, forming an embryo and developing into sea urchin larvae.50,51 Even under normal conditions, only a small percentage of sperm are able to locate and fertilize the eggs. The majority of sea urchin embryos and larvae are eaten by fish and only a few survivors mature into adults. To make up for this low success rate, sea urchins normally release millions of eggs and sperm into the surrounding water. However, the more acidic conditions predicted for the end of this century could reduce the number of sperm certain species release,52thereby further decreasing the size of the next generation of sea urchins
Sea urchins reproduce by releasing eggs and sperm <br>directly into the surrounding seawater. Under acidified <br>conditions the sperm of some sea urchins swim more <br>slowly,49 which reduces their chances of finding and <br>fertilizing an egg, forming an embryo and developing <br>into sea urchin larvae.50,51 Even under normal conditions, <br>only a small percentage of sperm are able to locate and <br>fertilize the eggs. The majority of sea urchin embryos <br>and larvae are eaten by fish and only a few survivors <br>mature into adults. To make up for this low success rate, <br>sea urchins normally release millions of eggs and sperm <br>into the surrounding water. However, the more acidic <br>เงื่อนไขการคาดการณ์สำหรับการสิ้นสุดของศตวรรษนี้สามารถ<br>ลดจำนวนของสเปิร์มบางอย่างการเปิดตัวสายพันธุ์ 52 <br>จึงต่อการลดขนาดของคนรุ่นต่อไป<br>ของเม่นทะเล
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