Byne’s decay on microscopic calcareous shells: case study of Alcide d’Orbigny’s foraminifera collections stored in Paris and La Rochelle, France Author Hairie, Clara Centre de Recherche sur la Conservation (CRC), UAR 3224, CNRS, MNHN, Sorbonne Université, Muséum national d’Histoire naturelle, case postale 21, 57 rue Cuvier, F- 75231 Paris cedex 05 (France) and Institut Lavoisier de Versailles (ILV), UMR 8180 (UVSQ-CNRS), Université Paris-Saclay, 45, avenue des États-Unis, 78000 Versailles (France) and Institut photonique d’analyse non destructive européen des matériaux anciens (IPANEMA), UAR 3641 (CNRS-MNHN-MC-UVSQ), Université Paris-Saclay - site du synchrotron SOLEIL, BP 48 Saint-Aubin, F- 91192 Gif-sur-Yvette, (France) Centre de recherche en paléontologie - Paris (CR 2 P), UMR 7207, CNRS, MNHN, Sorbonne Université, Département Origines et Évolution, Muséum national d’Histoire naturelle, case postale 38, 57 rue Cuvier, F- 75231 Paris cedex 05 (France) Author Forel, Marie-Béatrice Centre de recherche en paléontologie — Paris (CR 2 P), UMR 7207, CNRS, MNHN, Sorbonne Université, Département Origines et Évolution, Muséum national d’Histoire naturelle, case postale 38, 57 rue Cuvier, F- 75231 Paris cedex 05 (France) Author Bartolini, Annachiara Centre de recherche en paléontologie - Paris (CR 2 P), UMR 7207, CNRS, MNHN, Sorbonne Université, Département Origines et Évolution, Muséum national d’Histoire naturelle, case postale 38, 57 rue Cuvier, F- 75231 Paris cedex 05 (France) Author Müller, Camille Centre de Recherche sur la Conservation (CRC), UAR 3224, CNRS, MNHN, Sorbonne Université, Muséum national d’Histoire naturelle, case postale 21, 57 rue Cuvier, F- 75231 Paris cedex 05 (France) Author Steunou, Nathalie Institut Lavoisier de Versailles (ILV), UMR 8180 (UVSQ-CNRS), Université Paris-Saclay, 45, avenue des États-Unis, 78000 Versailles (France) Author Rouchon, Véronique Centre de Recherche sur la Conservation (CRC), UAR 3224, CNRS, MNHN, Sorbonne Université, Muséum national d’Histoire naturelle, case postale 21, 57 rue Cuvier, F- 75231 Paris cedex 05 (France) veronique.rouchon@mnhn.fr text Geodiversitas 2025 2025-10-09 47 16 659 685 https://sciencepress.mnhn.fr/sites/default/files/articles/pdf/geodiversitas2025v47a16.pdf journal article 10.5252/geodiversitas2025v47a16 1638-9395 17302384 urn:lsid:zoobank.org:pub:CC61025B-E168-4BC7-9017-686F442D323B

TABLE 4. — The different locations of the d’Orbigny foraminifera collection,Paris,from the XIXth century to nowadays and their corresponding environmental conditions.These data,collected and interpreted from archival records, are described elsewhere in full details (Hairie et al. 2022). They helped to estimate temperature variations that could occur from one location to another.The number of + indicates the amplitude of these temperature variations.

					The Jardin des Plantes, Paris
					The Palaeontology building on the Buffon street					New
	The family			North Eastern side				South Western side		storage
	house, Pierrefitte sur Seine	The buildings of the Whale courtyard	Basements	Palaeontology laboratory 1st floor	D’Orbigny room, 2nd floor	Vibraye room, 2nd floor	The Galleries	4th floor, storage room near offices	3rd floor, dark room	opposite side of the Buffon street
From July 1853 to end 1853	Sediment bottles and specimens
From 1854 to Jan. 1858	Sediment bottles and specimens
From Jan. 1858 to the end of the XIXth c.		Sediment bottles & mounted specimens
From begining of XXth c. to Jan. 1910			Sediment bottles and probably mounted specimens	Maybe mounted specimens
From Jan. 1910 to the 1930s			Probably during the two	Most of the collection			maybe part of the collection
From the 1930s to the 1960/70s			World Wars for protection against bombings		Sediment bottles and mounted specimens
From the 1960/70s to 1990				Mounted specimens	Sediment bottles
1990-2014								Mounted
					Sediment			specimens
2014-2019 2019-today					bottles		a few sediment bottles and mounted specimens		Mounted specimens	Sediment bottles and mounted specimens
Environmental conditions	?	The building is humid not to say unhealthy. Half of the building has been destroyed	High humidity conditions, slow and limited variations of temperature (excepted for the area next to the boiler room)	Small storage room with no windows and poor isolation	Double glass ceiling but no window	Large windows on the North Eastern side – Direct opening on the gallery	Numerous windows and a double glass ceiling provoke large diurnal variations of temperature	Last floor. Small storage room than opens on an office with large windows	The dark room opens on a stair well equipped with a glass roof	Air conditionning system by insufficient in the monitoring of humidity
Temperature var.	?	?	+	++	+++		++++	+++	++++	no