Thermal properties for digestive enzymes of a sub-antarctic beetle,hydromedion sparsutum (coleoptera,perimylopidae) compared to those in two thermophilic insects |
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| Institution: | 1. N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 4 Kosygina Str., 119991 Moscow, Russia;2. N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky Ave., 119991 Moscow, Russia;1. Université de Rennes 1, UMR CNRS 6553 Ecobio, Campus de Beaulieu, 263 Avenue du Général Leclerc, CS 74205, 35042 Rennes Cedex, France;2. Institut de Recherche pour le Développement (IRD), UMR IRD 224-CNRS 5290-Université de Montpellier 1, Université de Montpellier 2 MIVEGEC, 911 Avenue Agropolis, BP 64501, 34394 Montpellier cedex 5, France;3. Institut de Recherche en Sciences de la Santé (IRSS), Direction Régionale de l’Ouest (DRO), 399 Avenue de la Liberté, 01 BP 545, Bobo-Dioulasso, Burkina Faso;4. Université Claude Bernard Lyon 1, UMR CNRS 5023 LEHNA, 43 Bd du 11 Novembre 1918, 69622 Villeurbanne Cedex, France;5. Université de Rennes 1, UMR INRA IGEPP, Campus de Beaulieu, 263 Avenue du Général Leclerc, CS 74205, 35042 Rennes Cedex, France;1. Tallinn University of Technology, Tartu College, Puiestee 78, 51008, Tartu, Estonia;2. Nordic Botanical OÜ, Kõrgemäe talu, Soitsjärve, Tartu vald, Estonia;3. University of Tartu, Institute of Ecology and Earth Sciences, Vanemuise 46, 51014, Tartu, Estonia;1. Faculté de Gestion, Economie & Sciences, Laboratoire Ecosystèmes et Responsabilités Sociales, Université Catholique de Lille, 56 rue du Port, 59016 Lille, Cedex, France;2. Muséum National d’Histoire Naturelle, CNRS UMR 7179, 4 avenue du Petit Château, 91800 Brunoy, France;3. Université Lille 1, Laboratoire Génie Civil et Géo-Environnement, EA 4515, 59655 Villeneuve d''Ascq, France;4. Muséum National d’Histoire Naturelle, CNRS UMR 7205, 55 rue Buffon, 75005 Paris, France;5. UDSL, Forensic Taphonomy Unit, EA 7367, F-59000 Lille, France |
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| Abstract: | - 1.1. Proteolytic, lipolytic, amylolytic and cellulolytic activities were studied in adults of the phytophagous beetle, Hydromedion sparsutum, indigenous to the sub-Antarctic island of South Georgia.
- 2.2. Gastric enzyme activities were measured at experimental temperatures of 5–40°C and results were compared with those obtained from two thermophilic insects, Gryllus bimaculatus and Tenebrio molitor.
- 3.3. Protease and lipase activities in Hydromedion were 10–15 times lower than in Gryllus and Tenebrio.
- 4.4. In the temperature range of 5–15°C, α-amylase activity from Hydromedion was only slightly lower than that from Gryllus.
- 5.5. Hydromedion gut homogenates exhibited a distinct cellulolytic activity, even at a low temperature of 5°C.
- 6.6. Cellulolytic activity in the digestive tract of Hydromedion was confirmed by the evolution of 14CO2 after consumption of labelled cellulose.
- 7.7. The thermal properties of digestive enzymes agree well with the role of Hydromedion as primary decomposer in its ecosystem.
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