Today on Animal Fact Files we’re discussing stove-pipe sponges along with their relatives.
Sponges from this genus are also known as candle sponges, tube sponges, and rope sponges,
all receiving these various common names based on their appearance.
These sponges are cylindrical, often yellow in color, and have an opening at the top of their
tubes. The rope sponges also have rope-like projections surrounding this opening. Other
species don't have these ropes, so that's why they are distinguished with a different common name.
Like the other members of this genus, stove-pipe sponges are sessile meaning
they don't move around once they've found a place to settle. These invertebrates are most
abundant in the Atlantic Ocean but also live in the Pacific Ocean and Mediterranean Sea.
In some parts of their range, they make up the greatest number of sponges on the reef!
Stove-pipe sponges and their kin live along the ocean floor from shallow,
clear waters to depths over 100 feet (30.5m). Some can even be found in undersea caves!
Stove-pipe sponges in deep habitats grow to larger sizes.
While some shallow-living species may only reach a few feet in tube length, those further below
the waves span more than nine feet (2.7m) from base to the top of the tubes. It should be noted,
however, that shallow species tend to have more tubes than their deeper counterparts.
The tubes are hollow and create homes for other animals on the reef like shrimp and small fish.
The hole at the top of a stove-pipe sponge's tube is called an osculum.
Water is expelled from here as part of the filter feeding process.
Like other sponges, stove-pipe sponges and their relatives create water currents through their
bodies in order to capture planktonic organisms and detritus floating in the water. These
prey are captured in the sponge's body and the remaining water is forced out of the top of the
sponge. Sponges in this genus also have a large accumulation of bacteria living inside their body.
These bacteria may act as a food source, but they also exist without being digested by the sponges!
Sea turtles, like hawksbills, as well as sea slugs eat stove-pipe sponges and their congeners.
Fish also try to take bites out of them, however, when they're attacked, the sponges
let loose a noxious chemical that repels the fish. This is also an antifouling measure,
so other organisms like barnacles can't attach to the sponge's surface!
These compounds are a large reason behind scientific research on these animals.
They've provided the building blocks for all kinds of antibacterial, antifungal, antiviral,
and other pharmaceuticals. And that's not even mentioning that they're the original bath sponge!
Unlike many sponge species with a glass-like body structure, stove-pipe sponges are squishable!
If a human loses a body part, another human will not grow from that lost part,
but this isn't the case with sponges. If a chunk of a stove-pipe sponge breaks off from a predator
attack or rough seas, the broken off piece has a chance to grow into a new sponge. It needs an
appropriate environment like a hard surface to stick to and a current to bring it food,
but if these conditions are met a new sponge is born! This is a form of asexual reproduction.
Stove-pipe sponges and their kin also reproduce sexually. Sperm released into
the water column are gathered into other nearby sponges and fertilize their eggs.
The eggs hatch into larvae that then settle to the seafloor once an appropriate spot is located.
For more facts on stove-pipe sponges, check out the links below. Give a thumbs up if
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