Baby Octopuses Grow Hundreds of Mystery Organs Only to Lose Them as They Grow Up

Baby Octopuses Grow Hundreds of Mystery Organs Only to Lose Them as They Grow Up

Baby Octopuses Grow Hundreds of Mystery Organs Only to Lose Them as They Grow Up

Your internal organs grow and change throughout your life, but rarely do they vanish without a trace. For baby octopuses, things are not so simple.

Before they are born, embryonic octopuses sprout hundreds of temporary, microscopic structures known as Kölliker’s organs (KO).

Once everted, each organ may bloom open, revealing a burst of bristly fibers.

“When partially everted, KO look like a broom,” Roger Villanueva, a researcher with the Institut de Ciències del Mar at the Spanish National Research Council (CSIC), told Live Science in an email. “When totally everted, KO looks like half of a dandelion flower.”

Close-up with the KO

Biologists have known about these microscopic flowering organs for decades – but none could say for sure what they are for, or why embryonic octopuses completely lose their array of bristly bits and bobs long before reaching adulthood.

Now, recent research by Villanueva and his colleagues helps to shed light on the mysterious disappearing organs.

In a study published in the May 2021 issue of the journal Frontiers in Marine Science, the researchers examined 17 species of embryonic octopuses using a technique called light-sheet microscopy – essentially, a way of immersing a sample in fluid to make that sample transparent, then shining light through it to highlight hard-to-see structures.

Almost all of the 15 species that did have KO are born planktonic – meaning hatchlings are born very small and swim higher in the water column while their bodies grow and morph into adulthood.

The team learned that KO are dispersed evenly across the bodies of young octopuses, and they tend to be the same size, regardless of the size of the embryo.

They also discovered that, when all of an octopus’s KO are fully spread open, the animal’s surface area increases by a whopping two-thirds.

These discoveries could hint at the mysterious purpose of KO, the researchers said.

“[We] think that the organs could be used by the young octopuses to increase their surface-to-volume ratio,” Villanueva, who is the study’s lead author, said in a statement.

Deploying or retracting their KO could help the hatchlings conserve energy, the researchers hypothesized.

But there’s another, sneakier possibility. The researchers point to a 1974 study in the journal Aquaculture, which showed that, like crystals, KO can refract light in multiple directions. This refractive ability could help smear the hatchling’s outline in the water, making them harder for predators to catch, the researchers said.

If KO play a role in camouflage, that could explain why many octopuses that dwell near the deep, dark ocean floor don’t grow KO at all; in the lightless depths, there’s no need for camouflage.

It’s a possibility, anyway; even after looking closer at the structure of KO than any study before, the researchers say the true purpose of the unusual, disappearing organs remains a mystery.

“To explore inside the tissues and organs of hatchlings and juvenile octopuses at cellular resolution has been fascinating,” study co-author Montserrat Coll-Llado, a mesoscopic imaging specialist at the European Molecular Biology Laboratory, Barcelona, told Live Science. “It’s been like exploring the little corners of a city where you’ve never been – but better.”

Source: Science Alert

Octopuses have two alternating sleep states, study shows

Baby Octopuses Grow Hundreds of Mystery Organs Only to Lose Them as They Grow Up

One thought on “Baby Octopuses Grow Hundreds of Mystery Organs Only to Lose Them as They Grow Up

Leave a Reply

Your email address will not be published. Required fields are marked *

Solve : *
29 + 23 =

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Çok Okunan Yazılar