让乌贼受孕的方法不止一种

所有的精子都不一样。在果蝇中,雌性果蝇的生殖道越长,精子就越长。在被称为介形虫的微小甲壳类动物中,精子的长度可以变化从几百微米到几毫米。这里是您下一个鸡尾酒会的一些琐事,奥斯特拉科德的精子甚至可以比介形类动物本身还要多。除了恐吓女性之外,雄性种子的变异还有什么原因呢?

首先有精子竞争。随意借用这句话精子竞争对于你的下一个聚会也是如此。一种更长且更大的精子将更快地游泳,首先施肥鸡蛋。环境也起了很大的作用。精子和卵子是在公开的环境中配对,还是在雌性爱巢中配对,都能决定精子的大小。青蛙的精子大小取决于交配地点是在陆地上还是在水中。在布里克的乌贼中,竞争和环境都塑造了精子。

Female Bleeker’s squids can recieve sperm either in a seminal receptacle (location marked by blue arrow above), a specialized sac for holding sperm near her mouth (yes you read that right) or an internal oviduct (red arrow), the tube by which the egg passes from an ovary, behind her head. If you’re a big male and fight off the all other big males, you’re crowned the consort male! As a consort male you slide along side the female, put on some Marvin Gaye, and place your packets of sperm directly into her oviduct. At this point you guard her. She may interpret this as snuggling. This is a win for both of you. You’re ensuring no other males can mate with her until she spawns.

但也许你不是一个配偶雄性整天被人用盘子捧着你的小鱿鱼屁股。永不绝望!你是运动鞋男!一只运动鞋雄性冲向雌性和她的配偶,然后与雌性头对头地交配。宝贝,盯着我迷人的眼睛。去你的大乌贼和马文·盖伊。在这段幽会期间,穿球鞋的雄性会把他的精囊放在贮精器附近。

在实际产卵活动期间,共配和运动鞋男性的精子可以施肥蛋。

Due to the process of egg laying in L.bleekeri, insemination and fertilization can occur in two sites … a string of eggs is extruded from the oviduct (inside the mantle cavity) where it is exposed to consort sperm inside the oviduct (i.e. internal fertilization conditions), and the female pulls the egg string through her siphon and into position within her arm crown around mouth, where it is exposed to sneaker sperm (i.e. external fertilization conditions), before she deposits the egg string onto the sea bed.

配偶有一个明显的优势,因为他的精子靠近卵子。但男式运动鞋的赌注提高了产生的精子比配偶雄性大30%以上(上面的照片)。为什么?你可能会猜到这是因为Brawny精子可以超越他们的骨瘦如其竞争对手。但在运动鞋和联盟的男性之间没有看到精子速度的差异。对于您的信息,他们的精子在每小时约1/3英里游泳。运动鞋雄性的精子尺寸可能与外部受精条件的环境有关。更大的精子可以更好地在粘性环境中游泳,或者可能需要更大以保持更多的线粒体(用于细胞的发电机),因为它需要覆盖更多的游泳距离以最终到达鸡蛋。

所以这个故事的寓意是,你现在已经知道了。

Iwata,Y.,Shaw,P.,Fujiwara,E.,Shiba,K.,Kakiuchi,Y.,&Hirohashi,N。(2011)。为什么小男性有大精子:二态鱿鱼精子与替代交配行为相关联BMC进化生物学,11(1):10.1186 / 1471-2148-11-236

来自iwata等人的所有数字。(2011)

博士(1801个帖子

Craig McClain是舒萨瓦大学海洋财团的执行董事。他为20年进行了深海研究,并在该地区发表了超过50篇论文。他参与了几十个海洋探险,将他带到了南极和太平洋和大西洋最偏远的地区。Craig’s research focuses on how energy drives the biology of marine invertebrates from individuals to ecosystems, specifically, seeking to uncover how organisms are adapted to different levels of carbon availability, i.e. food, and how this determines the kinds and number of species in different parts of the oceans. Additionally, Craig is obsessed with the size of things. Sometimes this translated into actually scientific research. Craig’s research has been featured on National Public Radio, Discovery Channel, Fox News, National Geographic and ABC News. In addition to his scientific research, Craig also advocates the need for scientists to connect with the public and is the founder and chief editor of the acclaimed Deep-Sea News (//www.adambalm.com/), a popular ocean-themed blog that has won numerous awards. His writing has been featured in Cosmos, Science Illustrated, American Scientist, Wired, Mental Floss, and the Open Lab: The Best Science Writing on the Web.


“使乌贼受孕的方法不止一种”的3个回复

  1. 美好的报道!我尤其感兴趣为了了解这个物种的运动鞋雄性实际上有更小的精囊,尽管有更大的精子。

    此外,在第3段中,我认为你可能希望将“但是在一些Marvin Gaye”改为“放一些Marvin Gaye”。”=)

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