Gut load and transit time in Hormogaster elisae (Oligochaeta, Hormogastridae) in laboratory cultures

• Published in: European journal of soil biology 2002, Vol.38 (1), p.43-46
• Main Authors: Cosín, Darío J.Díaz, Ruiz, M.Pilar, Garvín, Marta H., Ramajo, Marta, Trigo, Dolores
• Format: Article
• Language: English
• Subjects: Agronomy. Soil science and plant productions; Biochemistry and biology; Biological and medical sciences; BIOMASA; BIOMASS; BIOMASSE; Chemical, physicochemical, biochemical and biological properties; CICLO VITAL; CYCLE DE DEVELOPPEMENT; DIGESTION; Earthworms; EXPERIMENTACION EN LABORATORIO; EXPERIMENTATION EN LABORATOIRE; FAUNA DEL SUELO; FAUNE DU SOL; Fundamental and applied biological sciences. Psychology; Gut load; Gut transit time; Hormogaster elisae; LABORATORY EXPERIMENTATION; LIFE CYCLE; OLIGOCHAETA; Physics, chemistry, biochemistry and biology of agricultural and forest soils; SOIL FAUNA; Soil science; Soil turnover; Zoology (interactions between soil fauna and agricultural or forest soils)
• ISSN: 1164-5563
• DOI: 10.1016/S1164-5563(01)01122-0

The gut load and gut transit time (GTT) of the endogeic earthworm Hormogaster elisae in laboratory cultures at 18 °C and 23 ºC were studied. The GTT, 5.25 h ± 0.40 at 18 ºC and 3.63 h ± 0.46 at 23 ºC, was determined by staining the soil with alimentary colouring (tartrazine). The gut load was calculated with two methods: earthworm mass difference, before and after voiding the gut, and dry mass of the gut content. The gut load ranged between 168 and 261 mg wet mass g live earthworm mass –1 (mass difference method) or 137–196 mg dry mass g live earthworm mass –1 (dry mass method). With the obtained data a potential annual soil turnover for H. elisae was calculated: 211–470 kg wet soil mass kg live earthworm mass –1 year –1 (mass difference method) or 176–325 kg dry soil mass kg live earthworm mass –1 year –1 (dry mass method).