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? Beadlet on a limpet

 
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nrp



Joined: 20 Nov 2005
Posts: 10
Location: Anstruther, Fife

PostPosted: Sun Nov 20, 2005 10:23 pm    Post subject: ? Beadlet on a limpet Reply with quote

I've just set up a cold

water marine aquarium at home and populated it with things off the beach. I put a beadlet anemone on a flat rock, and a common limpet nearby. The limpet pushed

under the anemone which has now attached itselt to the limpet shell. You can only see the limpet when it holds itself off the rock. At first glance, all you see is the

anemone.

I am fairly sure they both knew what they were doing - at least, the limpet has a head with feelers so it should know if it is up against an anemone.

The anemone was loose so it was perhaps eager to attach to anything it could.

I've not seen this behaviour before - has anyone else?
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Melanie



Joined: 25 Oct 2004
Posts: 26
Location: Torbay

PostPosted: Mon Nov 21, 2005 8:58 pm    Post subject: Reply with quote

Hi nrp
It is indeed well documented that anemones are aware of their immediate surroundings... beadlet anemones lean towards each other to

ward eachother off, if too close etc.

It is also well documented that limpets are aware of their immediate surroundings... they always rest in the same place on

the rock they reside on. They always move off to graze and then return to the rest place, so navigation relative to their surroundings is proven.



HOWEVER... your observation of the beadlet and the limpet 'knowingly' forging a relationship, is not substantially recorded, so is not (to my

knowledge) a usual 'doings'.
An important discovery... maybe! Wink but there is a fundamental scientific observation to apply across any 'observations that are not

in the wild'... some of them, for a tank, are mentioned here:

NOTE... A most important note to remember is that however pleasing a home made marine tank

looks, even if made of natural stuff, it is noticeably artificial to the inhabitants and they will be affected by the unusual changes..
NO Tides - (no pressure changes)


NO Tides - (no wet/dry cycles)
NO Tides - (no differential temperature changes)
Seawater content - (plankton content will be different without hours)


Seawater content - (density will be different due to evaporation)
Ambient Temp - (winter water temp will be changing to room temp)
Ambient Temp - (no

exposure to freezing air temps - ie winter low tide)
Substrate Change - (adaptation stress.. limpets spent whole life same place same rock as they are grazers so

change is tricky)
Substrate Change - (adaptation stress.. beadlets collect particals so change is less fussy)


It's not

impossible to keep a marine tank though! and amazing observations and points of interest can be had.


Mel Cool
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Steve



Joined: 31 Oct 2004
Posts: 14
Location: Plymouth

PostPosted: Wed Nov 23, 2005 2:32 pm    Post subject: Reply with quote

Hi nrp
Observations such as the limpet and the anemone antics you mention are all worth noting and pursuing further... as you are

doing.

Dont know of this antic being a usual practice of the limpet and anemone... and the info that Mel mentions above are indeed all factors that can alter the

'usual doings' of our seashore critters.
Even if the observation turns out as being not known about, perhaps just an incident rather than purposeful antic of the

creatures involved... by noting it, it may turn out to be a trend that others have spotted in past, or future and so reveal something knew etc.

The association of

a symbiotic relationship between an anemone and another ranging animal is already in existance... Hermit crabs are well known for plopping an anemone on the shell that

they are residing in... This relationship offers free food for the anemone when the crab is ripping up its food (all the small fragmented food particles are wafting up and

the anemone gets well fed) it also offers a bit of protection for the crab (it has a cloak of sting cells so is less likely to be nipped at by passing preditor).

Here's a

site that has info on keeping home aquariums for uk marine wildlife.
Click here for site:


http://www.glaucus.org.uk/wetthumb.htm

.
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nrp



Joined: 20 Nov 2005
Posts: 10
Location: Anstruther, Fife

PostPosted: Fri Dec 02, 2005 3:46 pm    Post subject: Reply with quote

Thanks all. I'll keep you posted if (when?) something interesting happens. Smile
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