{"id":1154,"date":"2020-08-17T15:18:31","date_gmt":"2020-08-17T13:18:31","guid":{"rendered":"https:\/\/www.life-sallina.com\/les-etudes\/caracterisation-des-fosses-de-ceinture\/"},"modified":"2020-09-03T17:50:38","modified_gmt":"2020-09-03T15:50:38","slug":"caracterisation-des-fosses-de-ceinture","status":"publish","type":"page","link":"https:\/\/www.life-sallina.com\/en\/les-etudes\/caracterisation-des-fosses-de-ceinture\/","title":{"rendered":"Characterization of the belt ditches"},"content":{"rendered":"\t\t
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Presentation<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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By belt ditch is meant a trench, more or less wide, dug into the ground, allowing the flow of fresh water from around the salt marsh: agricultural land, residential areas or road network. It ensures their collection and their evacuation to the ocean at low tide via the primary or secondary hydraulic network of the marsh: the stirrups and the bungs.<\/p>\n

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Example of belt ditches (photo credit\u00a0: ALTHIS)<\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Example of belt ditches overgrown with vegetation (photo credit\u00a0: ALTHIS)<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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These ditches, at the interface between soft and salty environments, constitute ecotones (transition zone between two ecosystems) and host heritage species notably amphibians and odonates. Due to lack of maintenance, part of these ditches is completely blocked by decaying vegetation and invaded by woody vegetation (willows, blackthorn, Baccharis).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Goals<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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The objective of the study is the physical characterization (size, slope of the banks, siltation, etc.) and ecological characterization (presence of amphibians or odonates) of the belt ditches of the Gu\u00e9rande and M\u00e8s salt marshes.<\/p>\n

Thanks to the prioritization of ditches, the results will make it possible to target the ditches to be restored as a priority.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Advancement<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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The study was carried out in spring 2019<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Results<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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28.4 km of belt ditches were characterized (9.9 km in the M\u00e8s basin and 18.5 km in the Gu\u00e9rande basin).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Hydraulic functionality :<\/span> 71% of the ditches studied are considered functional, 25% as defective and 4% no longer have the vocation of a belt ditch (reshaping of the surrounding land disconnecting the ditch from its primary or linear vocation of ditches corresponding to the networks of rainwater can no longer be considered as a belt ditch).<\/p>\n

Batrachological population :<\/span> 6 species and 2 genera have been observed: Calamite toad (Epidalea calamita), Nimble frog (Rana dalmatina), Spotted pelodyte (Pelodytes punctatus), Green tree frog (Hyla arborea), Spotted salamander (Salamandra salamandra), Webbed newt (Lissotriton helveticus), Brown type frog, Green type frog.<\/p>\n

The listed species are relatively common with the exception of the Calamite Toad (mentioned in Annex IV of the Habitats Directive and classified as “Vulnerable” on the red list of the Pays de la Loire) and the P\u00e9lodyte punct\u00e9e which both present a local stake .<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Calamite toad (photo credit: Cap Atlantique)<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Spotted pelodyte (photo credit\u00a0: Cap Atlantique)<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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60% of the ditches studied were frequented by at least 1 species.<\/p>\n

Odonatological stand: 8 species of dragonflies have been identified: Elegant Agrion (Ischnura elegans), Young Agrion (Coenagrion puella), Cute Agrion (Coenagrion scitulum), Brown Leste (Sympecma fusca), Wild Leste (Lestes barbarus), Small nymph in the body (Pyrrhosoma nymphula) of fire, Southern sympetrum (Sympetrum meridionale), Blood sympetrium (Sympetrum sanguineum).<\/p>\n

Although surveys were concentrated on areas favorable to the presence of odonates (water ditches, open areas, presence of bulrushes), few individuals were observed.<\/p>\n

In addition, despite a specific research protocol for Leste \u00e0 grand stigmas (Lestes macrostigma), the species was not found. Classified as \u201cEndangered\u201d on the red list of odonates in France, this species is particularly present in the Vend\u00e9e marshes.<\/p>\n

Other observations: the study made it possible to highlight the presence of the amphibious vole (Arvicola sapidus) at various points in the network of ditches. A nationally protected species and for which populations are considered to be declining in the Pays de la Loire region, little data has so far mentioned it in the salt marshes of Gu\u00e9rande and M\u00e8s. The presence of the species must be taken into account when carrying out restoration work on the belt ditches (maintaining areas with sufficient vegetation height to conceal individuals during the work).<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Presentation By belt ditch is meant a trench, more or less wide, dug into the ground, allowing the flow of fresh water from around the salt marsh: agricultural land, residential areas or road network. It ensures their collection and their evacuation to the ocean at low tide via the primary or secondary hydraulic network of […]<\/p>\n","protected":false},"author":1,"featured_media":1074,"parent":1079,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1154","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"\nStudies, Characterization of the belt ditches, LIFE Sallina<\/title>\n<meta name=\"description\" content=\"By belt ditch is meant a trench, more or less wide, dug into the ground, allowing the flow of fresh water from around the salt marsh\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.life-sallina.com\/en\/les-etudes\/caracterisation-des-fosses-de-ceinture\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" 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