Engaging with Ecosystems

**Scroll down for Welsh**  **Rholiwch i lawr i weld y testun Cymraeg**

What a fantastic evening we had last night at our “Engaging with Ecosystems talk”.   The main focus of the evening was the invasive species Rhododendron ponticum.

-  Did you know that there are over 1000 species of Rhododendron worldwide and Rhododendron ponticum is the only invasive one? 

- Did you know that it is a myth that the Victorians introduced Rhododendron ponticum to the UK?  It was in fact found here naturally before the last ice age but didn’t re-colonise.  It was then introduced by the Georgians around 1763!

- Did you know that it is extremely toxic and even honey produced from Rhododendron ponticum can be poisonous for humans, causing, among other things, heart problems?

The evening started with an introduction to Pensychnant Conservation Centre, where the event was held.  Julian Thomson, Pensychnant manager, outlined a brief history of the house and grounds and then told us about the way they have tackled Rhododendron there. 

Mary-Kate, project manager for the Snowdonia Society then introduced the concept of ecosystem services to the group.  Put simply, ecosystem services are the resources produced by the environment which humans use.  Examples would include clean air, pollination, flood control, Carbon sequestration and tourism.  Many of the Snowdonia Society workdays directly contribute towards maintaining or improving ecosystem services.  Footpath maintenance ensures that visitors to the area can safely enjoy Snowdonia while Himalayan balsam removal prevents native species from being out competed; both in terms of space and light and for pollinators.

Finally, Carwyn ap Myrddin of Snowdonia National Park Authority went into detail about large scale Rhododendron ponticum control in Snowdonia.  It’s a real problem as its thick branches block all light from reaching the ground, so it out-competes our native species.  It is also very toxic, making grazing as a control method difficult, and releasing toxins back into the soil, making re-colonisation by native species a challenge.  Each plant releases millions of seeds meaning that once established it is very difficult to get rid of!  It is estimated that it would cost £10 million to eradicate Rhododendron ponticum from Snowdonia.   Snowdonia National Park Authority, Natural Resources Wales (NRW) and the National Trust have teamed up to tackle Nant Gwynant, a key problem area for this plant – hopefully in the future tourists will be coming to see slopes full of native plants with not  a rhododendron in sight!

A big thank you goes out to Carwyn and Julian for sharing their expertise with us, and also to everyone who turned up to take part!

If you would like to get involved with some of the Snowdonia Society’s workdays, including Rhododendron ponticum control, check out our opportunities here.

Ymgysylltu ag Ecosystemau

Cawsom noson wych neithiwr yn ein sgwrs am "Ymgysylltu ag Ecosystemau".   Prif sylw’r noson oedd y rhywogaeth ymwthiol Rhododendron ponticum.

-  Wyddoch chi fod dros 1000 rhywogaeth Rhododendron ledled y byd a Rhododendron ponticum yw’r unig un yw’r unig un ymwthiol? 

- A wyddoch chi mai myth yw’r gred mai’r Fictoriaid a gyflwynodd Rhododendron ponticum yn y DU?  Mewn gwirionedd, roedd yma’n naturiol cyn oes yr ia diwethaf ond ni wnaeth ail-gytrefu.  Yna, fe’i cyflwynwyd gan y Sioriaid tua 1763!

- A wyddech chi ei fod yn hynod wenwynig a gall hyd yn oed mêl a gynhyrchir o Rhododendron ponticum fod yn wenwynig i bobl, gan achosi problemau’r galon ymysg pethau eraill?

Cychwynnodd y noson â chyflwyniad i Ganolfan Cadwraeth Pensychnant, ble cynhaliwyd y digwyddiad.  Fe wnaeth Julian Thomson, rheolwr Pensychnant, amlinellu hanes cryno’r tŷ a’r gerddi, ac yna fe wnaeth egluro inni sut maent wedi taclo Rhododendron yno. 

Yna, fe wnaeth Mary-Kate, rheolwr prosiect Cymdeithas Eryri, gyflwyno’r cysyniad o wasanaethau ecosystem i’r grŵp.  Yn syml, gwasanaethau ecosystem yw’r adnoddau a gynhyrchir gan yr amgylchedd a ddefnyddir gan bobl.  Mae enghreifftiau yn cynnwys awyr iach, peillio, rheoli llifogydd, dal a storio carbon, a thwristiaeth.  Mae llawer o ddiwrnodau gwaith Cymdeithas Eryri yn cyfrannu’n uniongyrchol at gynnal neu wella gwasanaethau ecosystem.  Mae cynnal llwybrau troed yn sicrhau fod ymwelwyr sy'n dod i'r ardal yn gallu mwynhau Eryri yn ddiogel ac mae clirio Ffromlys Chwarennog yn sicrhau nad yw rhywogaethau cynhenid yn gorfod cystadlu yn eu herbyn am le, goleuni a phryfed peillio.

Yn olaf, fe wnaeth Carwyn ap Myrddin o Awdurdod Parc Cenedlaethol Eryri roi cyflwyniad manwl am reoli Rhododendron ponticum ar raddfa helaeth yn Eryri.  Mae’n broblem sylweddol, oherwydd mae ei ganghennau trwchus yn atal unrhyw oleuni rhag cyrraedd y ddaear, felly bydd yn drech na'n rhywogaethau cynhenid.  Mae’n wenwynig iawn hefyd, sy’n golygu ei bod hi'n anodd defnyddio pori i'w reoli, a bydd yn rhyddhau tocsinau i'r pridd, sy'n golygu fod ail-gytrefu gan rywogaethau cynhenid  yn her.  Bydd pob planhigyn yn gollwng miliynau o hadau, sy'n golygu ei fod yn anodd iawn cael gwared arno wedi iddo sefydlu!  Amcangyfrifir y buasai difa Rhododendron ponticum  yn llwyr yn Eryri yn costio £10 miliwn.   Mae Awdurdod Parc Cenedlaethol Eryri, Cyfoeth Naturiol Cymru (CNC) a’r Ymddiriedolaeth Genedlaethol wedi dod ynghyd i’w daclo yn Nant Gwynant, un o’r mannau lle mae’r planhigyn hwn yn fwyaf problemus - gobeithio y gall twristiaid y dyfodol ddod i weld y llethrau yn llawn planhigion cynhenid, heb unrhyw rododendron i'w gweld!

Diolch yn fawr iawn i Carwyn a Julian am rannu eu harbenigedd â ni, a diolch hefyd i bawb a ddaeth draw i gyfranogi.

Os hoffech gymryd rhan yn rhai o ddiwrnodau gwaith Cymdeithas Eryri, yn cynnwys rheoli Rhododendron ponticum, darllenwch am ein cyfleoedd yma.

Lôn Gwyrfai - Rhyd Ddu to Beddgelert

Afon Gwyrfai flows from Llyn y Gadair via Llyn Cwellyn and thence to the sea. Lôn Gwyrfai, the new multipurpose trail, starts in much the same place but runs the opposite way, down the valley to Beddgelert. For many years the abandoned track of the Welsh Highland Railway was the de facto option but for obvious reasons this is out of the question these days.

David Firth leading a Snowdonia Society walk

Its official opening on 29th October marked the end of an 11 year project costing £630,000 which was funded by the National Park and the European Regional Development Fund. If it’s 7.6 km in length, that’s £83 a metre. Is that a lot and will it be worth it? Someone pointed out that much of the path was already in existence therefore the true cost per metre is much more. Whatever the cost, I am sure it will be hugely popular, much more so than the conservative estimate of 5,000 users per year.

A footpath would have been much cheaper than the multipurpose trail that makes it usable by cyclists and horseriders. The top section, around Llyn y Gadair, is also suitable for mobility scooters, but further along the journey becomes difficult with steps and the route is steep in places.

Rain clouds ahead.

A lot of thought has gone into the design. I like the fencing on the causeway that arcs outwards to minimise potential injury to riders falling from their horses. I like the floating nature of the fence, suspended on tight wires like on railways. Either end of the causeway are handy slabs of slate to sit on? No, these are for mounting and dismounting your horse. A footbridge over a stream for the walkers with a ford alongside for the bikers and riders. Towards Beddgelert there are old-fashioned cast iron gates that have been re-purposed with spring loaded high handles.

Peter Rutherford - creator of the trail

At either end is a car park and a station for the Welsh Highland Railway making it a very manageable circular route, complete with bike hire at the Beddgelert end.

It’s new and looking good at the moment but will need tender loving care and this is where the Snowdonia Society will help. We are entering into an agreement whereby our volunteers will maintain the trail, ensuring the drains are clear and thereby prevent erosion. If you would like to join in and be part of the Lôn Gwyrfai maintenance team, please email info@snowdonia-society.org.uk

Plas Tan y Bwlch's beautiful hydro scheme

Saturday’s walk to see the Plas Tan y Bwlch hydro electric scheme was a popular event with over thirty people taking part. It’s all very well hearing or reading about these schemes but there’s nothing quite like seeing it in action to understand the issues and how it all works.

We began at the top and worked our way down towards the turbine house with Andrew Oughton, who runs The Plas, leading the way. The top half of the scheme has a lot of pipework above ground because the ecologists argued against the felling of any trees. Good for the trees, but not so good for the view.  Maybe next time or in other schemes they might opt for burial of the pipe even if it does cost a couple of trees.  To minimise the visual impact the pipe is lagged with hessian and did I hear correctly, that the pipe has been smeared with yoghurt to encourage the growth of moss?

I won’t attempt to tell the story of the hydro because that has already been exceedingly well described by Twm Elias in the Autumn edition of Natur Cymru.

The 13th of June, 2013, was an important day in the history of Plas Tan y Bwlch, the Snowdonia National Park Centre, as the latest hydro-electric scheme at the Plas was officially opened. This is the third such scheme since the first small scheme was established in 1884, when the Plas was among the first houses in Wales to have its own private electricity supply....

The rest of the article can be read online here.

After visiting the turbine house we walked back up through the gardens with head gardener Chris Marshall leading the way, explaining the history of the gardens and the current emphasis on wildlife friendly gardening. Chris manages thirteen acres that were once looked after by a team of fourteen gardeners. One volunteer helps out and more are needed. If you fancy giving a hand, Chris will be very pleased to hear from you. There’s a lot to be done but the setting is so beautiful I’m sure it would be a labour of love.

Diolch yn fawr iawn Andrew a Chris.