Le bilan énergétique de Trinervitermes geminatus Wasmann (Termitidae, Nasutitermitinae) I. Mesure de biomasses, d'équivalents énergétiques, de longévité et de production en laboratoire

The fresh weights, dry weights, water contents, energy contents and ash percentages have been measured in most casts and instars of Trinervitermes geminatus from the region of Lamto (Ivory Coast). The alate production was inferred from the percentages of nymphs in natural societies. The production of steriles was measured in laboratory reared subcultures containing 500 to 3000 individuals. The ratio P/B equals 2.2. The mean longevity of the workers has been estimated in three different ways with inconsistent results (from 70 to over 300 days). These results are discussed and a mortality table has been built, taking into account the main experimental results. Thus it is estimated that larval development takes place in 18 days, that the mean longevity is 78 days for small soldiers, 118 days for large soldiers and 180 days for large workers; and the corresponding P/B ratio equals 2.4; it rises to 2.62 if alate production is taken into account. The production is partitioned between reproductive, defensive and labouring functions;Trinervitermes geminatus is considered as a K strategist. © 1982 Masson.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Etudes biologique et écologique des termites(Isoptera) de la savane de Lamto-Pakobo (Côte d'Ivoire)

Doctorat en Sciencesinfo:eu-repo/semantics/nonPublishe

Données préliminaires sur le peuplement en termites

Data are given on the distribution and. numbers of termites, their fungus gardens and nests, in the Lamto savannas in the Ivory Coast. The termite populations at Lamto are dominated by four subterranean Macrotermitinae species : Ancistrotermes cavithorax, Microtermes toumodiensis, Pseudacanthotermes militaris and Odontotermes pauperans and by two foraging, mound-construc ting Nasutitermitinae : Trinervitermes geminatus and T. togoensis. The poverty of humivorous species nests constitutes another salient feature of these populations. The density of termite colonies in Lamto depends on the water content of soils, soil texture and availability of food (cellulose)

Variations thermiques dans les nids de Trinervitermes geminatus Wasmann, en relation avec le milieu extérieur dans la savane de Lamto (Côte d'Ivoire)

Temperature measurements have been made in mounds of Trinervitermes geminatus Wasmann as well as in the soil. They have been recorded in june 1968 and in january 1969, before, during and after the bush fire. The temperature of the mounds varies with the conditions of enlightment and rain. At the top of the nests, the variations are about 40° C (72° F); in the subterranean rooms, they are about 2, 5° C (4, 5° F), just as in the soil at equal depth. The variation of temperature is smaller in bigger mounds but there is probably no regulation by the termites themselves. Only the mass of the mound seems to intervene in the deadening of the external variations of temperature. The immediate influence of the bush fire is insignificant: only the surface of the mound offers a very momentary variation. © 1971 Masson & Cie.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Le bilan énergétique de Trinervitermes geminatus (Wasmann) (Termitidae, Nasutitermitinae)

SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Écologie animale et végétale

SYL-8021 = Volume I3e édition 2001-02/1Vente uniquement aux étudiants suivant le cours susmentionné, sur présentation de leur carte d'étudiant AGRO3, BIOL3, GEOG3H, GEOG4H, GEOG3P, GEOG4P, ECOL026info:eu-repo/semantics/published

Ecologie animale et végétale

SYL-002562 = Volume I ;SYL-002563 = Volume IIAGRO3, BIOL3, GEOG3H, GEOG4H, GEOG3P, G2OG4PECOL0264e édition 2002-2003/1info:eu-repo/semantics/published

Earthworm communities along a gradient of urbanization

Earthworms were studied at six sites along a gradient of urbanization and their relations with several soil abiotic factors were determined. Concentrations of heavy metals, calcium and magnesium in earthworms and in soils were measured by atomic absorption spectroscopy. Strong negative correlations were detected between earthworm density and soil concentrations of cadmium and magnesium. Earthworm biomass was negatively correlated with lead, copper and zinc, and positively correlated with the distance from the centre of the city. High concentrations of Cd and Zn (concentration factors 49 and 32) were accumulated by earthworms in contrast to those of Cu and Pb (2 and 1). Relations between worm and soil concentrations of heavy metals, Ca and Mg are discussed. © 1995.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Ecologie animale et végétale

SYL-001879 = Volume 1 ;SYL-001880 = Volume 2Syllabus strictement réservé aux étudiants suivant le cours de 1re Licence Sciences Biologiques ;1re année du grade d'Ingénieur Agronome - ECOL 0261re édition 1999-2000/1info:eu-repo/semantics/published

Species groups in the genus Cubitermes (isoptera: Termitidae) defined on the basis of enteric valve morphology

Seventy-four species, forms and varieties of Cubitermes Wasmann, 1906 have been studied, including taxa placed in synonymy with other species. Within this group of taxa, the enteric valve, mainly of the workers and soldiers, provided the best and the only clear-cut criteria for distinguishing some major subsets that are proposed here as species groups.The genus Cubitermes is re-described; the morphologies of the enteric valves are described in detail including the number of spatulae at the downstream end of the primary cushions; the possible presence of crests or bulges near the downstream end of the primary cushions; the overall shape of the primary cushions; the number of lateral supporting bristles; the kind of symmetry of the valve; and the structure of the secondary cushions. These characteristics are used to define nine species groups. For now, these groups have no taxonomic ranking but are helpful as regards species recognition. Identification keys for species groups are provided for soldiers and workers together with a partial key for imagines. Geographical ranges of the groups are also provided. On the basis of enteric valve morphology, some synonymies can no longer be validated: (a) C. planifrons Sjöstedt, 1924 is not a synonym of C. fungifaber (Sjöstedt, 1896); (b) C. kemneri Emerson, 1928 is not a synonym of C. zenkeri (Desneux, 1904); and (c) C. fungifaber var. elongata Sjöstedt, 1924 does not belong to the species C. fungifaber. Cubitermes planifrons and C. kemneri become valid again and C. fungifaber var. elongata is an invalid name.SCOPUS: ar.jinfo:eu-repo/semantics/publishe