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Rapport Général Vertigo Sp Benoît Vincent (Coris) Sylvain Vrignaud Nathalie Cauliez (Ecogée) 13 rue Letort Rue du Pont Chinard 5 rue du Général de Gaulle 75018 Paris 7 Clos Joseph Laurent 45130 Meung-sur-Loire 06 41 99 00 80 03000 Neuvy 02 38 46 51 00 [email protected] [email protected] [email protected] SIRET 791 498 017 00023 06 52 87 80 10 SIRET 393 162 268 00022 SIRET 450 661 665 00023 Mise en œuvre du suivi des populations du Vertigo de Des Moulins Vertigo moulinsiana (Dupuy, 1849) et du Vertigo étroit Vertigo angustior Jeffreys 1830 sur le territoire champardennais de la région Grand Est Tome 1. Rapport régional Janvier 2019 VINCENT – VRIGNAUD – CAULIEZ 2018_Suivi Vertigo moulinsiana & V.angustior Champagne-Ardennes 2/163 Table des matières Introduction.............................................................................................................................4 1. Objectifs de l’étude..................................................................................................................................4 2. Présentation de l’équipe.........................................................................................................................4 2.1 Nathalie Cauliez............................................................................................................................................... 4 2.2 Benoît Vincent................................................................................................................................................. 4 2.3 Sylvain Vrignaud.............................................................................................................................................. 5 A. Généralités..........................................................................................................................6 1. Enjeux de la biodiversité et enjeux malacologiques.........................................................................6 2. Les Vertigos................................................................................................................................................7 2.1 Généralités....................................................................................................................................................... 7 2.2 Facteurs favorables à la présence et au maintien des Vertigos..............................................................8 3. Présentation du secteur d’étude...........................................................................................................9 3.1 Données générales......................................................................................................................................... 9 3.2 Météorologie des deux saisons de prospections....................................................................................11 3.3 Les sites d’étude............................................................................................................................................ 12 4. Justification de l’importance du suivi des espèces.........................................................................17 B. Méthodologie de l’étude...............................................................................................18 1. Synthèse bibliographique.....................................................................................................................18 1.1 La précédente campagne d’inventaire......................................................................................................18 1.2 Les DOCOB, FSD et fiches ZNIEFF..............................................................................................................18 1.3 Bibliographie historique..............................................................................................................................19 2. Choix des secteurs d’étude..................................................................................................................21 3. Protocole de recherche des espèces..................................................................................................23 3.1 Battage de la végétation.............................................................................................................................23 3.2 Prélèvement de litière.................................................................................................................................. 24 4. Aspects biocénotiques..........................................................................................................................25 5. Variables environnementales..............................................................................................................27 5.1 A l’échelle locale............................................................................................................................................ 27 5.2 A l’échelle géographique............................................................................................................................. 27 6. Estimation statistique de la répartition et de la taille des populations.....................................30 6.1. Pression d’échantillonnage, estimation des effectifs et évolution des populations......................30 6.2 Évaluation des méthodes de détection des espèces..............................................................................33 6.3 Modélisation des préférences écologiques.............................................................................................37 C. Résultats............................................................................................................................39 1. Synthèse des résultats..........................................................................................................................39 2. Évaluation du protocole........................................................................................................................43 2.1 Battage........................................................................................................................................................... 43 2.2 Prélèvement de litière.................................................................................................................................. 44 3. Espèces.....................................................................................................................................................46 3.1 Présence/absence......................................................................................................................................... 46 3.2 Répartition par secteurs des sites..............................................................................................................47 3.3 Autres espèces à enjeu de conservation...................................................................................................54 4. Aspects biocénotiques..........................................................................................................................59 4.1 Malacocénoses............................................................................................................................................... 59 4.2 Habitats........................................................................................................................................................... 60 5. Variables environnementales..............................................................................................................62 5.1 Variables environnementales locales........................................................................................................62 5.2 Variables environnementales géographiques.........................................................................................66 6. Préférences écologiques......................................................................................................................71 6.1 Préférences locales....................................................................................................................................... 71 6.2 Préférences géographiques........................................................................................................................ 73 D. Discussion.........................................................................................................................76 1. Tendance générale des populations...................................................................................................76 1.1 Sur la répartition régionale des espèces...................................................................................................76 VINCENT – VRIGNAUD – CAULIEZ 2018_Suivi Vertigo moulinsiana & V.angustior Champagne-Ardennes 3/163 1.2 Sur la dynamique des populations.............................................................................................................76 1.3 Sur les effectifs.............................................................................................................................................. 78 2. Hiérarchisation des sites.......................................................................................................................79 2.1 Évaluation de l’équilibre écologique des sites.........................................................................................79 2.2 Enjeux de conservation ou de gestion......................................................................................................81
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