Valley – check with likes

January 23, 2019

Wednesday, January 23, 2019

Alfred E Baldacchino

The news of the restoration of Wied il-Qlejgħa, alias Chadwick lakes, is good news. Not least because the ‘cleaning of valleys’ has been put to bed.

The largest dam at Wied il-Qlejgħa in all its glory

The measures highlighted in the media for such restoration are also something to look forward to, namely: restoration of dilapidated rubble walls; removal of the playing area; removal of invasive alien species of flora and fauna; removal of accumulated sediment behind dams; restoration and utilisation of the Fiddien pumping station; and the planning of walking trails.

Dilapidated rubble walls – not an uncommon site after some heavy rainfall

Valleys in the Maltese islands are a sensitive ecological areas – much ignored, unappreciated and abused. These have been abandoned and mismanaged for years, making their restoration more delicate. They are dried river beds, once adorned with dwarf hippopotamus and endemic swan. Climate change reduced these rich fresh water habitats to what they are today.

30+ year old gabbjuni still uncolonised by indigenous flora.

 

Dilapidated rubble walls is the first item that should be addressed, thus stopping soil erosion, one of the main culprits for the filling up of the dams.

The use of gabbjuni (big cages) to repair/replace rubble walls should not even be considered. A look at the 30-year-old gabbjuni installed along the valley, shows how barren they are. Not even the tenacious invasive cape sorell (l-ingliża) has managed to colonise any of them.

The play area in the midst of willow trees. Now who would have thought of this?

The removal of the playing area in the midst of the valley is a sine qua non. I wonder who was the architect who conceived this idea in the middle of one of the largest valley in the Maltese Islands!

Alien invasive eucalyptus trees dominate the valley. One might have to tread careful here because these can be protected by the latest tree protection regulations issued by ERA.

The removal of invasive alien species of flora and  fauna is another step in the right direction.

No need to say that this is a sensitive and delicate endeavour. It is not just bulldozing them on the lines of how the Ministry of Transport bulldozes trees. The invasive species of flora have to be gradually removed  in some areas, while being replaced by indigenous species.

Invasive species growing in Wied il-Qlejgħa include: she oak (less than a dozen), castor oil trees (less than 100), acacias and eucalyptus (more than a score and twenty of each species).

Their removal has to be professional so as not to contribute further to their dispersal. This applies mainly to the castor oil tree which has to be uprooted, and burned on site thus eliminating the possibility of giving it a free ride and opportunity to its seeds to germinate on new reclaimed grounds.

Furthermore, indigenous species which grow in the valley, such as poplar trees, willows, almond trees, lentisks, olive trees, chaste trees,  should not be mistaken for invasive species and removed. Not a far-fetched concern.

The removal of invasive alien species of flora and fauna is another step in the right direction. No need to say that this is a sensitive and delicate endeavour

On the other hand, the notorious lately introduced red swamp crayfish also abounds in the valley, detrimental to any fresh aquatic life such as indigenous painted frog and its tadpole, dragonflies and water beetles larvae. The person who introduced such alien species, should be chained to a poplar tree until the last crayfish is collected.

The indigenous poplar tree – adorns its natural habitat. No it is not dead.

On the other hand indigenous trees adapted to such a riverine habitat include the poplar tree, already established in the valley, willow (two species also established), chaste tree (of which there is half a dozen) and rare species of ash and elm.

AmbjentMalta can start propagating them immediately so that they will be readily available for planting as standard trees as soon as a parcel of the valley has been restored.

There are also a number of indigenous flora, some  rare and scarce aquatic species, such as water cress, sanicle-leaved water crowfoot, and bulbous buttercup. Others not so rare are greater plantain, creeping cinquefoil, rushes and sedges.

Rare and scarce aquatic plants whose seeds aestivate in the sediment. (Photos by Stephen Mifsud).

 

Another delicate exercise is the removal of debris, and sediment accumulated behind the two main water dams. Presumably, one would think, this would be undertaken during the hot summer months when the cisterns are dry. This means that the top layer of the sediment will be full of seeds and ova of species frequenting the aquatic habitat. The collecting of approximately 15 cm of scraped surface sediment to be redeposited in the restored parts, would contribute to the survival of these rare species.

motor bike tracks in the main footpaths 

The valley bottom is constantly being abused by off-roading motorbikes as one can see from the erosion of footpaths and fresh tyre marks.

One of the shallow dams closest to Fiddien has also been damaged to make easier access.

Modern environment friendly public access gate

So the suggestions for walking trails is another positive approach, especially if these are somewhat raised from the ground, for the convenience of wild fauna.

Furthermore, public access gates can be installed along the way, as a measure for controlling bikes – motor or manual.

I know that if Dr Daniel Micallef, one of the few politicians with environment at heart, could see this, I am sure he would send some people to hell.

The Fiddien box, which was restored during the time when Daniel Micallef was Minister for Education and Environment, has long been vandalised and the heavy water pump has seemingly disappeared – hopefully taken by the Water Services Corporation for safe keeping?

The plans for their restoration and educational use is also another positive step.

The second dam, needing some structural repairs, still contributes its best for the storage of water, before it passes it to Wied tal-Isperanza.

Once restoration works are completed, the valley has to be monitored and managed. Traffic management tops the list.

This will ensure that the number of vehicles frequently jamming the area on public holidays and Sundays will not bring such restoration to naught by their haphazard parking. So it would be beneficial to one and all if the road through the valley is made one way: from Imtarfa to Mosta.

The farming community can have an identification permit displayed on car windscreens, to allow them to use it both ways during working days.

The proof of this EU funded pudding is in the eating.

I will be watching grastis et amoris patria, naturally.

Alfred Baldacchino is a former assistant director of the Malta Environment and Planning Authority’s environment directorate.

This is a Times of Malta print opinion piece

aebaldacchino@gmail.com

related articles on this blog:

Jappella biex Chadwick lakes jigi mmaniġġat aħjar

In-nixfa tax-xitwa u s-siġra tal-lewż

https://alfredbaldacchino.wordpress.com/2014/06/24/xqed-naghmlu-bl-ilma-tax-xita/

https://alfredbaldacchino.wordpress.com/2014/04/28/water-harvesting-culture/

https://alfredbaldacchino.wordpress.com/2013/11/20/aghmel-xita-aghmel-2/

 

 

 

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EU stand on invasive species

October 29, 2012

Monday, October 29, 2012

EU stand on invasive species

Alfred E. Baldacchino

The public is becoming more and more aware of invasive species, not because of any proactive educational measures or political convictions or commitments but, unfortunately, because of the invasive species’ economic, social and ecological negative impacts.

We are talking of non-indigenous or non-native species that are introduced into a region or a country. These adversely affect natural habitats, which they invade and then establish themselves. Invasive species can be either plants or animals.

The European Union defines “invasive alien species” as those species that threaten biological diversity. These species can be introduced either intentionally or accidentally.

The modern means of aerial, terrestrial and marine transport, has aided the spread of such invasive species to the extent that, today they know no boundaries. Even island-states that once had a natural barrier against such invasive species are today as susceptible to them as much as land-locked states.

The EU has as one of its main aims the free movement of goods. It also has a number of legal instruments such as directives, regulations and decisions which oblige member states to do their utmost to control invasive species. Given the free movement of goods concept, such regulations are very frail. An ad hoc committee is in fact discussing measures to be adopted in this regard.

Over the years, the importance and need to address the issue of invasive species gathered momentum on an international level following their economic, social and ecological negative impacts. Controlling invasive flora, fauna and pathogens species is a major global challenge because they are among the greatest threats to biodiversity.

dead palm trees

Dead Palm Trees – the result of the introduced invasive alien Red Palm Weevil (Rhynchophorus ferrugineus). Most of the Palm Trees in Howard Gardens, Rabat, and others in the surrounding areas have all been killed.

Their threat to global economic health is significant, estimated at $350 billion annually. The United Kingdom annually spends £1.7 billion to control the impact of just three freshwater species: the American bull frog, the red-eared slider and the American signal crayfish. The EU spends €16 billion to control the damage of some of the invasive species established in the Community.

Social entities, whether political, scientific, environmental, conservationists, even some economical, are belatedly realising that the free movement of goods concept, and the breaking down of trade and other barriers between people and nations just for economic gain, is only benefiting the entrepreneurs while externalities, or hidden costs, are being borne by society and the environment at large.

The EU is not a party to the Convention on International Trade in Endangered Species of Wild Flora and Fauna (CITES) because the parties to this convention have not yet approved an amendment for the adherence of regional economic blocks.

Despite being just an observer to this convention, the EU has its own regulations that implement CITES in the EU member states. These regulations go further than those of the convention itself because the latter’s aim is the protection of the listed species per se while those of the EU encompass, to some extent, the social or ecological impact on the environment by the imported traded species.

These EU regulations are updated from time to time and one such measure is the updating of the list that includes the suspension of trade of certain species within the Community. This list includes, among others, the red-eared slider terrapin, the painted turtle, the American bull frog and the ruddy duck.

Following the Scientific Review Group report, the EU has added three invasive species of squirrels by suspending their introduction through international trade within the Community, namely the fox squirrel, native of North America; the eastern grey squirrel, native to the eastern and mid-western United States; and the Pallas squirrel, native of South Asia.

This regulation was published in the EU official journal of August 20 and became binding on September 10 in its entirety and directly applicable in all member states, including Malta.

Malta is not spared from the negative impact of invasive species. During these last few years, these have had their negative impact on the local natural habitats and also on indigenous species. Some of these were accidentally introduced while others were intentionally released in the wild.

Levant water frog

The Levant water frog (Pelophylax bedriagae) is an intentionally alien invasive species introduced in the wild in the island of Gozo, preying on the indigenous Painted Frog (Discoglossus pictus)and other indigenous aquatic species.

Some of the established alien invasive species, and their negative impacts visible in Malta include, the red palm weevil, the geranium bronze butterfly, the mulberry longhorn beetle, the fountain grass, the Hottentots fig, the Brazilian pepper tree, the Levant water frog, the mosquito fish and the red-eared slider, the latter three intentionally introduced in the freshwater pool at San Rafflu in Gozo, from where the former is spreading. There are also others, such as land snails, whose negative impact is not yet being seen or felt.

Fountain grass

The Fountain Grass (Pennisetum setaceum) extensively used in Government Landscaping programme, in one of the latest introduced invasive species which is found growing in some valleys and also along roadways.

The present scenario with regard to invasive alien species is that while entrepreneurs cash on the profits from the sale of imported traded species, society and the environment pay for the externalities of such trade.

Geranium Bronze

The South African Geranium Bronze Butterfly (Cacyreus marshalli) is another locally invasive species introduced in 2007. It is increasing rapidly and is found both in urban areas and also in rural areas, both in Malta and also in Gozo.

SEE ALSO

https://alfredbaldacchino.wordpress.com/2011/10/02/roundabout-plants-described-as-invaders/

https://alfredbaldacchino.wordpress.com/2010/07/25/the-red-palm-weevil-another-alien-species/

https://alfredbaldacchino.wordpress.com/2010/06/21/the-introduction-of-alien-species-into-the-natural-environment-%E2%80%93-a-european-concern/