Archive for the ‘Uncategorized’ Category

Sponsored swim postponed

Monday, August 18th, 2014

Due to bad weather over the weekend (with wind speeds gusting to over 50KPH), we were obliged to cancel our swim across the Piel channel, we are hoping to re-schedule this for the weekend of the 20th September.

If you would like to sponsor this event (proceeds to National MCS), please visit our ‘JustGiving’ site:

justgiving.com/lancashiremcs/

Death of Ron Crosby

Wednesday, June 26th, 2013
Photo of Ron Crosby.

Photo of Ron Crosby on the summit of Ben Nevis in 2006 during the 3-Peaks challenge, a fund raising event for National MCS.

We are sorry to announce that Ron Crosby, a  founder member of the Marine Conservation Society, and Chairman of the Lancashire Area Group for many years, passed away on Sunday evening (23rd June 2013) after a short illness.

He was a driving force behind the group for some years, and we will miss his enthusiasm, knowledge and unrivaled experience of diving in the UK. He was also active in a number of globally significant marine wildlife conservation projects, particularly that in the Chagos Islands.

Our thoughts are with his wife Rita, also a staunch supporter of the group, and his family.

Calendar for 2013-14

Monday, June 17th, 2013

We’ve got our new calendar online, covering September 2013 through to April 2014. As yet the Roa island dives are not in the calendar, but the first possibility is for Wednesday 19th June, meeting at about 19:30 BST. The weather is looking a little iffy for this with wind swinging round to the NW for Wednesday. Well get other dates online asap.

We have a possible trip to Lochaline in May 2014. This trip is usually for five nights with a mix of divers and non-divers, but to run this we really need 10 people (sleeping 2 or 4 to a room), and to get a good date we’ll need to book soon, so if you are interested please contact Barry!

MCS diary for 2013-14

Beachclean June 2013

Also, a big thank you to everyone who came along on Sunday for the beach clean and litter survey! Data is being processed, and hopefully we’ll get a short report on that in the next meeting.

Roa Island shore walk, July 2012

Tuesday, July 10th, 2012

A warm sunny evening and a low spring tide, the perfect conditions for exploring the shore.  The venue, Roa Island with it’s boulder and muddy beach and a couple of man made structures providing addtional habitat types.  The top of the beach is composed mainly of  large boulders with barnacles, wracks and large patches of blue mussels.  On the middle of the shore,  shore crabs, edible periwinkles, and dog whelks with thousands of eggs were all very common and here three or four European oysters were recorded.  The underside of the jetty provides homes for clumps of mussels, sea squirts, hermit crabs and at the seaward end of the jetty a couple of  European cowries were spotted. Moving further down the shore and searching beneath the boulders revealed both broad and long clawed porcelain crabs, chitons and we were suprised to find common brittle stars, an animal no where near as common in the channel as it was some years ago.  Other inhabitants of this lower part of the shore were grey top shells, butterfish, common stars and colourful patches of both green and orange sponge.  In the shallow pools left by the tide  the tubes of  peacock worms stood upwards from the mud and tiny anemones were to be seen amongst the stones.  As the tide reached it’s lowest point we were able to see peacock worms with extended tentacles collecting food passing by in the water.  We had spent a couple of very enjoyable hours  recording and photographing in excess of thirty different species of plant and animal on this very small area of shore.  Many thanks to Lewis for organising the event. 

 

Piel Channel dive

Monday, April 2nd, 2012

Weather conditions for the site had been perfect for more than a week, so we travelled to Roa Island on Sunday 1st. April with high expectations of having a good interesting dive. Looking down on the water from the lifeboat gantry the conditions looked OK, so we kitted up and took the plunge.  Much to our surprise after we had covered only a few metres from the shore  the underwater visibility was no more than half a metre. It was quite light but there was very fine silt suspended in the water. As we progressed deeper it became more and more gloomy. At the deepest point (10.7m) in the middle of the channel it was completely dark and impossible to see anything. We swam slowly back up the slope to into shallower water, about (5m deep). here the bright sun penetrated the silty water a little more and the diverse marine life that we are used to seeing in the channel came into view. In the very small field of vision there were numerous species of crab, tiny anemones, sponges, common whelks, mussels and a small number of the  beautiful hydroid, Tubularia indivisa with tentacles extended. On returning to shore we  discovered that dredging operations were being carried out in the Channel and had been for a number of days.  This was the reason for the poor visibility and our far less than perfect dive. It was though the first of April !

Oban area weekend

Tuesday, July 5th, 2011

Seven members of the group spent an interesting long weekend at the end of June in the very popular area around Oban. Weather conditions were quite mixed, but we did manage to avoid the showers.  A number of dives took place including one on a rocky reef in the inner basin of Loch Creran, then north to the spectacular submarine wall in Loch Linnhe near Kentallon.  We also made a visit to the littledived Loch Feochan just a few miles few miles south of Oban. The chart indicated that we could expect to see a lot of mud.   The mud was part of the attraction, would we find sea pens and large anemones.  From the easy access point, a lay-by right alongside the loch we swam over stones and pebbles covered with various green and brown seaweeds, then onto the gently sloping mud. There were occasional boulders covered with mussels, then at about four metres deep were dozens of the sea slug Philine aperta and the small almost transparent sacks of their eggs.  Continuing down the slope to about six and a half metres below the surface where hundreds of sea pens Virgularia mirabilis covered the sea bed.  This was only a quick look at a loch that I feel has much more to offer.  Many thanks to Jo and Barry Kaye for organising a very enjoyable weekend.

Lochaline, April 2011

Friday, April 22nd, 2011

A very successful trip to Lochaline on the West coast of Scotland was enjoyed by ten members of our group. General weather and sea conditions over the four days was on the whole very good.  Based at the Old Post Office in Lochaline we were only a couple of  hundred yards from the access point to a spectacular dive location, the  Hotel Beach Wall. The dive starts off swimming down a very gentle slope of mainly white silica sand with occasional large boulders covered with kelp and sheltering shore crabs and sea stars etc. as the slope gets steeper tube anemones, Cerianthus lloydii  in a variety of colours are very common.  The sandy slope ends quite abruptly as we reach the top of the almost vertical wall which plunges down to a depth of more than one hundred metres.  Just a few of the very common inhabitants on the wall are Tubularia with numerous nudibranchs,  football sea squirts, squat lobsters, feather stars and sponges etc. We  are also able to add a further two animals to our Group’s list of recordings for this dive site, a lumpsucker, Cyclopterus lumpus spotted on a couple of dives and a number of Brachiopods, (lamp shells)  Terebratulina retusa.  Dives also took place at Fiunary Rocks, a typical sea loch slope  further West along the Sound of Mull and on the sea grass beds at Rubha-nan-So’rnagon  in Loch Linnhe. 

Most members of the party spent some time walking in the area, on the shores of Lochaline, to see the carved stones at Kiel and to the East side of the loch to the fossil burn where we were very lucky to see otters.

Many thanks to Jo and Barry for such a well organised trip.

Summer events with the MCS

Tuesday, April 19th, 2011

Our diary has just been updated with events for this summer. This includes a series of talks on common marine ecosystems around the UK coastline, plus dive trips and walks.

Lancashire MCS summer diary

Monthly Meeting – March

Sunday, March 13th, 2011

Sea Cucumbers in the Indian Ocean – Mandy Knott

March’s meeting was a talk by Mandy based on her work with Shoals Rodrigues (http://www.shoalsrodrigues.net/), surveying sea cucumbers in the lagoon of the island of Rodrigues.

Rodrigues is the furthest east of the three Islands of Mauritius and, from a marine biology view, is interesting because it is effectively isolated from lands to the west by the trade winds and ocean currents that sweep in from the south east, from which direction the nearest landfall is Australia. Politcally it is an autonomous region of Mauritius. Much of the land is mountainous and many people turn to the sea to provide their living. To this end Rodrigues does possess the largest coral lagoon in the world.

There’s always a ‘but’ and for Rodrigues there are several when it comes to taking advantage of this resource. What all the ‘buts’ come back to is overfishing; the large predatory fish have all gone from the lagoon, the fishermen have no boats capable of fishing beyond the safety of the lagoon, and the sea cucumber has become the main stay of the fishery.

Sea cucumbers are not vegetables, or even plants, but animals – Echinoderms – closely related to urchins and starfish. Their basic form is a sausage shaped animal with a mouth at one end that has tentacles that pass food to the mouth. Food for these animals usually being detritus or some other microscopic source or protein. Reproduction can be sexual or asexual – either male and female animals communicate by and respond to chemical signals in the water to synchronise the release of sperm and eggs into the water, or some species can also multiply by splitting into two parts. Overfishing therefore can be a big problem for sexual reproduction in these animals – as they need to be close enough to one another in order to be able to use their chemical communications effectively; the population could drop to a point where the animals are present but unable to breed.

That they could be thought of as food may seem an unlikely direction, as to western eyes they don’t appear all that apetising and the processing they go through after being caught doesn’t improve this viewpoint at all. However sea cucumbers are valued in China and South East Asia for both cuisine and traditional medicine – the general rule being the uglier the better.

Signs that the sea cucumbers were following the fish have been there for some years, and four reserves were set up around the lagoon to give areas where there was no fishing. Unfortunately it seems these are not being managed or enforced. An earlier Shoals Rodrigues survey had estimated the sea cucumber population of the lagoon at @48 million. The 2010 survey looked at many of the same sites and used the same statistical model to estimate the population again – and found a significant reduction in the overall population.

Prior to restrictions of fishing being imposed a official study found that 55000 animals were taken in 15 days (these were just the fishermen they knew about – there were probably more people fishing unregistered).

One glimmer of light on the horizon is the possibility of ‘ranching’ sea cucmbers. This would be a bit like farming them. Even this has its problems though; the Rodrigues government is understandably very keen to to get it going and wants use a species – Holothuria Scabra – that is native to Mauritius and has been successfully ranched elsewhere. One of the key criteria is that the species used should be one that is native to the Rodrigues lagoon and Holothuria Scabra has only ever been recorded on one survey there – one commissioned by the government; it has never been recorded by any of the other surveys, which have taken many days and many sites into account. Naturally there is some scepticism about that one survey and some concern of the effects the introduction of a non-native species could have on the endemic species resident in the lagoon.

Another glimmer is that a fisherman’s cooperative has been set up and is in the process of obtaining and fitting out boats fishing beyond the reef, which would hopefully reduce pressure on the lagoon species. To what degree that is successful remains to be seen.

See also –

http://www.sos.bangor.ac.uk/research/php/theme.php?project=445 for some information on Bangor University’s work in Rodrigues

http://www.sempa-rodrigues.com/images/3rd%20Ecology%20and%20GIS%20Interim%20Report.pdf – a report on SEMPA (the South East Marine Protected Area) including survey data

February Meeting – Marine Mammals – Janet Preece

Tuesday, February 15th, 2011

Janet took us through a range of mammals that can be classed as ‘marine’, from polar bears to whales via sirenians, otters, dolphins and – her particular favourite – seals.

Mammals have problems adapting to life in the marine environment, not least of them insulating themselves against the chilling effect of the water on their warm blooded bodies. While most marine mammals rely on a layer of fat to help keep them warm, we learnt that not only is the sea otter the smallest marine mammal, it is the only one that relies solely on its fur for insulation, having the densest fur in the animal kingdom. It’s probably the only tool user too: they often use a rock to break open shellfish, lying on their backs in the water with the shellfish on their chests and pounding down with the rock.

As well as the problems of keeping warm marine mammals have all the problems of being air breathing animals in a watery environment, tied to maintaining contact with the surface, and with a range of breeding strategies to cope with this. They have also reached differing levels of adaption to moving through water; some being fully aquatic, and others needing to return to land.

We skimmed on past whales, dolphins, and porpoise to concentrate on Janet’s favourite animals – seals.

Both species of seals we have in this country are true seals, as opposed to the sea lions and fur seals, and the walruses. True seals are more adapted to the water than the other two groups but are still tied to the land.

Our two species are the harbour (or common) seal Phoca vitulina, and the grey seal Halchoerus grypus. We have significant proportions of the world populations of both species in our seas, which makes them globally significant.

Janet covered some of the threats to seals and other marine life in general. One of the most shocking was the ‘corkscrew killer’, where animals have been found with deep wounds spiralling along their bodies; the most likely explanation for this being that the animals have been caught in a ‘ducted’ propellor. Other threats included all the usual suspects – pollution, plastic bags and ballons, discarded fishing gear, hunting, and the effects of overfishing on the food chain.

Some great pictures and stories of seal encounters around the Farnes reminded me of some of my own seal encounters around the Farne Islands and others. I haven’t got any Janet’s pictures but some of my pictures are at –

http://www.zen102367.zen.co.uk/diving/farnes0806.htm

A selection of interesting facts that I picked up on the way –
If you find a dolphin or porpoise stranded on the shore it can be difficult to tell the difference; but if you look at the teeth, dolphins have conical shaped teeth and porpoise have spade-like teeth.
Walruses use the “squirt and suck” method of feeding (I can’t remember exactly how it works but I just love the way it sounds!).
Whales make footprints. Their skin is oily and the tail will leave an oily ‘print’ on the surface of the water as they dive.