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Brenthis Ino (Rottemburg, 1775) Heliconiinae Le Nacré De La Sanguisorbe

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Brenthis Ino (Rottemburg, 1775) Heliconiinae Le Nacré De La Sanguisorbe Famille Nymphalidae Sous-famille Brenthis ino (Rottemburg, 1775) Heliconiinae le Nacré de la Sanguisorbe Statut Les populations du Nacré de la Sanguisorbe sont parfois importantes dans les biotopes favorables. L’évolution des milieux humides de plaine laisse redouter une future modifi cation de statut. RE UGAN CR Denis J EN VU NT Bourgogne LC Franche-Comté DD NA NE Europe – LC France – LC Mâle (Haute-Saône, 2009). Écologie et biologie Distribution tion fourragère (retournement, fauches répétées et précoces, amendements…). Le Nacré de la Sanguisorbe, hygro- Espèce eurasiatique. En France, phile, affectionne les prairies humides, y elle est présente surtout dans le Nord- Orientations de gestion et compris les prairies de fauche, les bords Est, mais manque dans la plupart des de rivières, de marécages et d’étangs, départements de l’Ouest. mesures conservatoires les clairières et les chemins forestiers Elle est bien répandue sur la retom- Ce papillon présente la capacité et même les pourtours des tourbières. bée méridionale des Vosges qui recèle de se maintenir sur de petites surfaces, Quelques mètres carrés suffi sent à de nombreux biotopes favorables, de- ce qui lui permet de reconquérir rapi- l’établissement d’une petite colonie qui puis la chaume du Ballon de Servance dement des espaces favorables à partir peut parfois jouxter une route, une zone (1 216 m) jusqu’à basse altitude (185 m) de stations-refuges. La conservation de industrielle ou commerciale. Des indivi- le long des affl uents de la Saône. Dans réseaux de prairies humides par pâtu- dus erratiques ont été observés loin d’un l’arc jurassien, elle monte en altitude rage extensif ou fauche tardive s’avère biotope favorable. Les adultes butinent jusqu’à 1 485 m (Jura : Crêt Pela). en ce sens indispensable, tout comme Difficulté de nombre de plantes nectarifères (Trèfl es, le maintien des micro-zones humides En Bourgogne, l’espèce est bien Renoncules, Scabieuses, Cirses, Suc- distribuées à la faveur de dépressions le détermination représentée dans le Morvan, le Bazois et cise…) et se reposent souvent ailes long des petits cours d’eau, suintements le Châtillonnais. Dans le département de ouvertes au soleil. La chenille se déve- et autres ruisselets. loppe sur la Reine-des-prés (Filipendula l’Yonne, elle est très peu représentée et ulmaria) et probablement sur les San- se raréfi e quasiment partout. guisorbes (Sanguisorba minor et S. offi - cinalis) dans certains secteurs d’altitude. Phénologie Espèce univoltine, volant en une gé- Description et risques de nération surtout groupée en juin-juillet. confusion Dates extrêmes : (13 mai 1973) Les individus des deux sexes de 21 mai – 24 août (15 et 16 septembre Brenthis ino sont très proches : dessus 2011). fauve orangé orné de macules noires et d’une bordure marginale continue, Atteintes et menaces dessous de l’aile postérieure marqué de Bien qu’elle soit capable de subsis- Diagramme taches variant du jaune au rouge brique ter dans des milieux de faible superfi cie écologique dans la partie basale et brun violacé au- comme des abords de fossés agricoles, delà de l’aire médiane. La femelle est cette espèce est fortement impactée par 4 Chaud parfois assombrie. la modifi cation de son habitat, qui tend 3 à subir un morcellement généralisé. Les 2 Brenthis ino ressemble à B. daphne, atteintes portées aux zones humides et 1 mais ce dernier est plus grand, plus plus particulièrement aux mégaphor- Humide Sec arrondi, avec le revers des postérieures biaies à Filipendule lui sont néfastes. Ces plus violacé. La confusion reste néan- formations végétales, souvent réduites, moins possible avec certains sujets de B. tendent en effet à être trop systémati- daphne atypiques et usés. Froid quement détruites en vue d’une valorisa- 300 Rev. sci. Bourgogne-Nature - Hors-série 13-2013 ROT UFFONI ARADAN Jean-Marie P Alexandre R Jean-François M Chenille sur Filipendula ulmaria (Doubs, 2010). ARADAN Jean-François M Reine-des-près (Filipendula ulmaria). Chrysalide (Doubs, 2010). Femelle (Nièvre, 2009). 150 9000 UGAN n = 782 ARADAN Denis J 125 7500 100 6000 Jean-François M 75 4500 50 3000 25 1500 Femelle sombre (Haute-Saône, 2010). Imago (Doubs, 2009). 0 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152 Janv. Févr. Mars Avr. Mai Juin Juil. Août Sept. Oct. Nov. Déc. Phénologie de Brenthis ino. avant 1970 1970 - 1999 2000 - 2011 Distribution de Brenthis ino en Bourgogne et Franche-Comté. Atlas des papillons de jour de Bourgogne et de Franche-Comté (Rhopalocères et Zygènes) 301.
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