ما هي الحيوانات التي تعيش في أعماق البحار؟
المعلومات الأساسية عن حيوانات المحيط: التعمق في الأسئلة الشائعة
تحت سطح المحيط تقع مملكة حيوانية غامضة، بدءًا من أصغر العوالق الحيوانية وحتى عمالقة الكوكب الضخام. هناك حيوانات محيطية جميلة، وحيوانات محيطية ...
Feb 29, 2024
رمي النفايات
تتبرز الحيوانات في المحيط، وهو أمر ضروري لسلاسل الغذاء البحرية وامتصاص الكربون. تقوم الكائنات مثل الحيتان والفقمات والسلاحف والأسماك العظمية بالتبرز بطريقة تقليدية. ومع ذلك، فإن بعض الأنواع تقوم بذلك بشكل مختلف. على سبيل المثال، تقوم قناديل البحر والشعاب المرجانية بـ” <anchor>رمي النفايات</anchor>”  نظرًا لوجود طريق واحد فقط للدخول والخروج من معدتها، بينما يتغذى الإسفنج ويتبرز عبر مسامه.
Jellyfish don’t throw-up or poop, they throop. They throop through their manus. – The Helm Lab Blog
# The Helm Lab Blog

Science, art, and jellyfish

# Jellyfish don’t throw-up or poop, they throop. They throop through their manus.

Screen Shot 2018-03-06 at 7.26.28 PMOk ok. This post is already starting off like a bad 3rd-grade-boy joke. But seriously (butt seriously?)–that beautiful jellyfish pictured above, well, you’re looking right at its anus. Or is its mouth? As my friend loves to call it, it’s actually a “manus”. That’s because jellyfish doesn’t technically have mouths or anuses, they just have one hole for both in things and out things, and for biologists, that’s kind of a big deal.

See, most animals have two holes, and the evolution of the dual-hole system has consumed the minds of many a scientist for centuries. In fact, just recently a friend of mine published a whole paper on the butt problem, titled–and this is no joke–“Getting to the Bottom of Anal Evolution” (You can read it here). Butts are serious stuff. They mean you can digest food in a linear fashion, which allows you to extract all kinds of nutrients in different specialized parts of your digestive tract. Jellyfish have no such linear movement o’ poo. There’s just one hole for taking things in, and then moving ’em out again–are they throwing up or pooping? For now, let’s call it throoping. And that makes them really interesting.

In the future, I hope to do a bit more work on jellyfish throoping. For example, when food moves around this very two-way digestive system, does it all get digested evenly all around, or does coarse digestion take place in one part of the gut, and fine digestion take part in a different place? Does it all circulate chaotically, or is there some systematic process?

At the moment, all of these are open questions. Though a few studies suggest there is some order to this seeming internal chaos. There do appear to be particular areas for coarse digestion and fine digestion. But is this true for all species? How about for size? And are there particular “in” and “out” parts of the manus? For now at least, the best we can say is that jellyfish have a single hole, and how exactly it works for them is something of a mystery. In the meantime, let’s all be thankful for our wonderful one-way digestion, complete with a front door AND a back!

### Share this:

LikeLoading...

### Related

## Post navigation

### Leave a comment Cancel reply

Δ

## Follow Blog via Email

Email Address:

Follow

Privacy & Cookies: This site uses cookies. By continuing to use this website, you agree to their use.

To find out more, including how to control cookies, see here:
Cookie Policy

Join 355 other subscribers

Sign me up

Loading Comments...

Write a Comment...

Email (Required)Name (Required)Website

%d