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云贵川22选5选号秘籍 www.dxhba.com 科普一下,蛋蛋是怎樣成色的?



導讀:蛋蛋是如何成色的,或許很多人都還不知道,但它的成色可不是隨隨便便的。來一起看看吧!
Depending on the species, bird eggs can be any color ranging from chicken’s plain white to a robin’s blue, streaked, spotted, bright, pale, and anything in between.
根據種類的不同,鳥類的蛋顏色各異,從白色的雞蛋,到藍色的知更鳥蛋,還有條紋的、斑點的、鮮亮的、淺色的,以及其它介于這些顏色的蛋。
As the egg moves down the female’s oviduct, the tube that connects the ovary to the outside, it squeezes against glands that produce colored pigments that combine to form every color in the egg shell spectrum. If the egg is stationary at the time that it comes in contact with these glands, it’ll be spotted. If the egg is in motion, it will be streaked.
當蛋順著雌性鳥類的輸卵管向外移動時,連接卵巢和外界的管道會擠壓腺體產生色素,這些共同作用下,蛋殼就染上了各種各樣的顏色。如果蛋在接觸顏色腺體時是靜止的,它就會染上斑點。如果蛋是運動的,則會染上條紋。
So why go through all the trouble of producing colored eggs? For many species of birds that nest out in the open, the eggs’ colors help to conceal them by enabling them to blend into the background.
為何要如此大費周章的給蛋上色呢?對許多露天筑巢的鳥類來說,蛋的顏色有隱身的作用,可以借著顏色與外界溶為一體。
Another way that colored eggs come in handy, is that in some species, like murres, individual birds learn to recognize their own particular markings and reject eggs that don’t match. In contrast, birds that nest in cavities, or that start incubating as soon as the egg is laid and consequently don’t need to hide their eggs, tend to lay unmarked white ones.
有顏色的蛋還有另一個作用,那就是對諸如海鷗之類的鳥,它們能夠識別蛋上的獨特印記,以丟棄那些不屬于自己的蛋。相反的,在洞里筑巢的鳥,或是一生下蛋就開始孵化的鳥,它們不需要把蛋藏起來,因此更容易生下沒有顏色的白色的蛋。
Given all this, how do scientists explain the fact that robin’s eggs are an eye-catching, unmarked blue? Perhaps this enables robins to spot when a parasitic bird tries to add its own eggs to the nest.
既然這樣,科學家又怎么解釋有著顯眼純藍色的知更鳥蛋呢?或許是因為當寄生鳥把蛋下在知更鳥的巢里時,這會幫助知更鳥區分出它們。
For some species, this may pose a greater threat than that of nest robbers.
對于一些鳥類來說,鳩占鵲巢比被搶了老窩更危險。



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