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Plot to save the river clam, the most threatened mollusk in Spain

07/14/2021 at 11:09 CEST

The Council of Ministers, at the proposal of the Ministry for the Ecological Transition and the Demographic Problem (MITECO), has accredited an settlement for the safety of auriculate naiad (Margaritifera auricularia. This settlement, signed between the Ministry, the Autonomous Group of the Ebro Hydrographic Confederation, the Foral Group of Navarra and the Autonomous Group of Aragon, seeks to shield this mollusk, the most threatened in Spain. Your scenario is important.

The auriculate naiad, also called margaritone, is one in every of the rarest freshwater mollusks in the Iberian Peninsula. At current it is just current in the Ebro river basin and in 4 of its autonomous communities –Navarra, La Rioja, Aragón and Catalonia–.

The species has seen its populations decline dramatically since the early 20th century. Because of this, it’s included in the class “in hazard of extinction” inside the Spanish Catalog of Threatened Species and declared “In important scenario & rdquor; by a ministerial order of 2018, by which the works and initiatives geared toward their restoration are declared of normal curiosity.

The accredited settlement articulates the collaboration between the totally different organizations concerned in actions for the conservation of the river clam, which might attain 18 centimeters in size and dwell for greater than 60 years.

Creation of a breeding and restoration heart

Creation of a breeding and restoration heartThe most notable measure of the settlement is the creation of a breeding and restoration heart for Margaritifera, as soon as ex situ replica methods have been perfected thanks to analysis carried out over the final decade.

To do that, MITECO will perform the obligatory actions for the building of the heart and can proceed to contract or fee the undertaking drafting and building of the advanced by means of its personal medium.

For its half, the Ebro Hydrographic Confederation undertakes to present the obligatory land and infrastructure to perform the work.

Spain has been working since 2007 on the safety of the auriculate naiad by means of the Technique for its conservation.

This doc comprises the primary traces of motion and measures for the conservation of the species. It additionally serves as an exponent of the actions that the totally different Public Administrations are finishing up constantly in favor of the species and, on the different hand, as a reference to elaborate or overview the restoration plans of the autonomous communities.

The target of the Conservation Technique is to promote the actions obligatory to considerably lower its excessive likelihood of extinction, in addition to stopping and reversing the present regression strategy of the species by controlling its threats.

Excessive likelihood of extinction

Excessive likelihood of extinctionIts goal is to promote the actions obligatory to considerably scale back its excessive likelihood of extinction, in addition to to cease and reverse the present regression strategy of the river clam by controlling its threats.

The components which have acted or are performing negatively on the species inflicting its important scenario are the following. These associated to the alteration, destruction or contamination of their habitat stand out:

-The channel alterations by means of reservoirs, dams, pipelines, gravel and sand extraction, and logging of riverside forests they’ve brought on the disappearance of populations and might forestall their future restoration by deteriorating the habitat of the species.

-The channel disturbances the place the species is current and, basically, its dredging and paving.

–The motion plans on the channels with the presence of this mollusk that include the full lining of its channelsThis may be the complete elimination of the river clam populations and the remainder of the present benthic fauna.

-The deadly ones minor upkeep work that don’t have in mind the necessities of the species could also be liable for the loss of life of many people, both by direct influence on the specimens or, not directly, by means of profound alterations in the seabed and in the fluvial dynamics.

-The water withdrawals for agricultural and hydroelectric makes use of in the Ebro hall, particularly in the Meandros del Ebro, the place virtually all the river movement is periodically diverted for hydroelectric makes use of.

-The alterations affecting pure migrations and replica of host fish of the glochid of this river clam, important to full its life cycle, could also be one in every of the principal causes of its extinction.

-The lack of recruitment. Juvenile specimens haven’t been discovered in any of the locations the place its presence is thought in the Ebro basin.

No breeding for many years

Plainly Naiad has not reproduced frequently in the wild for a number of many years, most likely due to the lack or shortage of host fish and the absence of fresh and well-oxygenated bottoms.

Considered one of the principal the explanation why host fish have disappeared or are very scarce in the Ebro river is the building of dams and different obstacles put in alongside rivers.

These dams additionally change the pure movement of water and the dynamics of sediment deposition, straight affecting river clams.

Technique for the conservation of the river clam: https://www.miteco.gob.es/es/biodiversidad/temas/conservacion-de-especies/pbl_estrategia_margaritifera_auricularia_tcm30-194739.pdf

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About the author

Donna Miller

Donna is one of the oldest contributors of Gruntstuff and she has a unique perspective with regards to Science which makes her write news from the Science field. She aims to empower the readers with the delivery of apt factual analysis of various news pieces from Science. Donna has 3.5 years of experience in news-based content creation, and she is now an expert at it. She loves journalism, and that is the reason, she moved from a web content writer to a News writer, and she is loving it. She is a fun-loving woman who has very good connections with every team member. She makes the working environment cheerful which improves the team’s work productivity.

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