[Adastra] slipper limpet

Steve stevep.savage at ntlworld.com
Fri Mar 2 00:30:21 GMT 2012


As Sarah says, slipper limpets are an alien introduction with a fascinating
ability to change sex. 

 

The slipper limpet is thought to have hitched a ride on American Oysters
after the local oysters declined due to overfishing in the late1800's. (Also
possibly on the hulls of ships).  We regard oysters as a delicacy, in
Victorian England pickled oysters were a regular food of the poor in London
and other towns. The American Oysters were shipped over to support the
failing oyster industry bringing the slipper limpet with it.

 

Slipper limpets live in chains, the bottom being a female the rest are
males. If the female dies, the next male in line changes sex and becomes
female. Slipper limpets secrete a chemical that attracts new larvae to join
the chain. If they cannot find a chain they settle on a rock or large
pebble, mature to adult as a female and then secrete a chemical to attract
larvae thus starting a new chain. 

 

Unlike common limpets, slipper limpets are filter feeders. 

 

The empty slipper limpet shells are now one of the most common sea shell
washed up on Sussex Beaches.

 

Steve Savage

http://www.fosbeach.com/education-on-shoreham-beach/

 

 

-----Original Message-----
From: adastra-bounces at lists.sxbrc.org.uk
[mailto:adastra-bounces at lists.sxbrc.org.uk] On Behalf Of
adastra-request at lists.sxbrc.org.uk
Sent: 01 March 2012 22:51
To: adastra at lists.sxbrc.org.uk
Subject: Adastra Digest, Vol 70, Issue 4

 

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Today's Topics:

 

   1. Re: Fw: What is it? (S J Patton)

   2. Re: Fw: What is it? (dawn nelson)

 

 

----------------------------------------------------------------------

 

Message: 1

Date: Thu, 1 Mar 2012 22:45:07 +0000 (GMT)

From: S J Patton <house.mouse at btopenworld.com>

To: Adastra discussion group <adastra at lists.sxbrc.org.uk>

Subject: Re: [Adastra] Fw: What is it?

Message-ID:

      <1330641907.78828.YahooMailNeo at web87003.mail.ird.yahoo.com>

Content-Type: text/plain; charset="iso-8859-1"

 

Slipper limpets! Originally aliens and they have interesting sexual
habits!!!

?

Sarah

 

 

________________________________

From: dawn nelson <dawninthegarden at btinternet.com>

To: Adastradiscussion group <adastra at lists.sxbrc.org.uk> 

Sent: Thursday, 1 March 2012, 22:42

Subject: [Adastra] Fw: What is it?

 

 

Has anyone ?got any idea what this is, am sure I should know it's
very?familiar?but don't think I have ever known.

 

Guided Wild Flower Walks in our beautiful countryside

Horticultural ?help and advice ?from The Garden Coach

contact

Dawn Nelson?dawninthegarden at btinternet.com

 

 

----- Forwarded Message -----

From: Rupert Harper <rupert.harper at btinternet.com>

To: dawn nelson <dawninthegarden at btinternet.com> 

Sent: Thursday, 1 March 2012, 18:43

Subject: What is it?

 

 

Dawn,

 

It was good to see you yesterday.

 

I am embarrassed by my ignorance. There are loads of these on the beach but
I can't remember what they are:

 

 

 

-- 

Rupert Harper,

B.Sc.(Eng), C.Eng., C.I.T.P., F.B.C.S., A.C.G.I.

Director, Locomotech Ltd.

"Trains and Boats and Planes"

+44 7071-RUPERT (7071-787378) rupert.harper at btinternet.com
http://www.trainsandboatsandplanes.co.uk If you can see the answer then you
are a visionary.

If you can draw it then you are an artist.

If you can build it then you are a sculptor.

If you can explain how it works then you are a scientist.

If you can do the calculations then you are a mathematician.

If you can see it, draw it, build it, explain it, do the calculations and
make it work then you are an Engineer.

 

 

(c) Rupert Harper, 2005, 2006 - may be freely distributed on condition that
original authorship and copyright are acknowledged

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Message: 2

Date: Thu, 1 Mar 2012 22:51:31 +0000 (GMT)

From: dawn nelson <dawninthegarden at btinternet.com>

To: Adastra discussion group <adastra at lists.sxbrc.org.uk>

Subject: Re: [Adastra] Fw: What is it?

Message-ID:

      <1330642291.79441.YahooMailNeo at web87303.mail.ird.yahoo.com>

Content-Type: text/plain; charset="iso-8859-1"

 

thank you Sarah

?

Guided Wild Flower Walks in our beautiful countryside

Horticultural ?help and advice ?from The Garden Coach

contact

Dawn Nelson?dawninthegarden at btinternet.com

?

 

 

________________________________

 From: S J Patton <house.mouse at btopenworld.com>

To: Adastra discussion group <adastra at lists.sxbrc.org.uk> 

Sent: Thursday, 1 March 2012, 22:45

Subject: Re: [Adastra] Fw: What is it?

 

 

Slipper limpets! Originally aliens and they have interesting sexual
habits!!!

?

Sarah

 

 

From: dawn nelson <dawninthegarden at btinternet.com>

To: Adastradiscussion group <adastra at lists.sxbrc.org.uk> 

Sent: Thursday, 1 March 2012, 22:42

Subject: [Adastra] Fw: What is it?

 

 

Has anyone ?got any idea what this is, am sure I should know it's
very?familiar?but don't think I have ever known.

?

Guided Wild Flower Walks in our beautiful countryside

Horticultural ?help and advice ?from The Garden Coach

contact

Dawn Nelson?dawninthegarden at btinternet.com

?

 

----- Forwarded Message -----

From: Rupert Harper <rupert.harper at btinternet.com>

To: dawn nelson <dawninthegarden at btinternet.com> 

Sent: Thursday, 1 March 2012, 18:43

Subject: What is it?

 

 

Dawn,

 

It was good to see you yesterday.

 

I am embarrassed by my ignorance. There are loads of these on the beach but
I can't remember what they are:

 

 

 

-- 

Rupert Harper,

B.Sc.(Eng), C.Eng., C.I.T.P., F.B.C.S., A.C.G.I.

Director, Locomotech Ltd.

"Trains and Boats and Planes"

+44 7071-RUPERT (7071-787378) rupert.harper at btinternet.com
http://www.trainsandboatsandplanes.co.uk If you can see the answer then you
are a visionary.

If you can draw it then you are an artist.

If you can build it then you are a sculptor.

If you can explain how it works then you are a scientist.

If you can do the calculations then you are a mathematician.

If you can see it, draw it, build it, explain it, do the calculations and
make it work then you are an Engineer. (c) Rupert Harper, 2005, 2006 - may
be freely distributed on condition that original authorship and copyright
are acknowledged

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