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1

Synchrony between small mammal population dynamics in marshes and adjacent grassland in a landscape of the Jura plateau, France: a ten year investigation

100%
Michelat D., Giraudoux P.
Acta Theriologica
|
2006
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tom 51
|
nr 2
155-162
Small mammal populations were studied during a 10 year multi-annual fluctuation of vole populations in marshes and adjacent grassland of the basin in the Jura mountains, France. Nine species were monitored:Microtus agrestis, Clethrionomys glareolus, Apodemus flavicollis, Sorex araneus Icoronatus, Neomys fodiens, Crocidura leucodon, Mustela nivalis in marshes andArvicola terrestris andMicrotus arvalis in grassland, using live-trapping and index methods during July from 1993 to 2002. Populations of A.terrestris, M. arvalis, M. agrestis, S. araneus I coronatus andM. nivalis exhibited a relatively strong inter-specific temporal synchrony in their multi-annual fluctuations.C. glareolus population fluctuations were not synchronous to theArvicola I Microtus I Sorex group, and were closer to those ofApodemus flavicollis, Neomys andCrocidura. Those results are discussed in the light of earlier studies carried out in the same region and in northern ecosystems.
2

Estimation of fat sand rat Psammomys obesus abundance by using surface indices

80%
Fichet-Calvet E., Jomaa I., Giraudoux P., Ashford R. W.
Acta Theriologica
|
1999
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tom 44
|
nr 4
The fat sand rat Psammomys obesus Cretzschmar, 1828 is an important reservoir host for the human disease, cutaneous leishmaniasis. To develop a method for moni­toring changes in the population density of this rodent over large areas, fragments of food, faeces, urine marks, and earth mounds at the burrow entrance were evaluated as indicators of abundance. The results were compared with population density measured simultaneously by trapping. Through the year as a whole, urine marks correlate poorly with abundance, but the three other indicators correlate well. A correlation coefficient of 0.74 is achieved with food fragments and faeces combined. The correlation is best during the wet season and poorer in dry conditions. The value of this indirect popu­lation index is discussed in relation to climatic conditions. Details are proposed for the establishment of a monitoring system for P. obesus populations in time and space.
3

Fatty acid composition in relation to the micro-organisms in the Sfax solar saltern, Tunisia

61%
Ayadi H., Elloumi J., Guermazi W., Bouain A., Hammami M., Giraudoux P., Aleya L.
Acta Protozoologica
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2008
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tom 47
|
nr 3
189-203
4

Estimation of water vole abundance by using surface indices

61%
Giraudoux P., Pradier B., Delattre P., Deblay S., Salvi D., Defaut R.
Acta Theriologica
|
1995
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tom 40
|
nr 1
A method to estimate the abundance of the fossorial form of the water vole Arvicola terrestris scherman (Shaw, 1801) has been developed, by using surface indices. Results are compared to the standard method of estimation using trap lines. These results show quantitatively that it is possible to differentiate reliably mole indices from water vole indices. Moreover, the two species are inclined to exclude each other. Even though water voles share the same galleries as moles, specific surface indices of the water vole occur for any density exceeding 2 ind/trap line (over 20 ind/ha). Several models of abundance estimation are put forward, all of them using linear multiple regressions. Correlations between the estimations from indices and the estimations from trap lines exceed 0.8 and the limits of using abundance classes are tested. Other limits are developed in the discussion. One of them is that the sampling intervals are saturated for densities exceeding 400 ind/ha. The index method, which is easy to carry out, offers the definite advantage of being suitable to space and time scales otherwise incompatible with estimations from trap lines. For instance, it allows distribution maps from wide transects about areas of more than 25 km2 to be drawn, in less than two days.
5

Distribution of small mammals along a deforestation gradient in southern Gansu, central China

51%
Giraudoux P., Quere J. P., Delattre P., Bao G., Wang X., Shi D., Vuitton D., Craig P. S.
Acta Theriologica
|
1998
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tom 43
|
nr 4
Small mammals were surveyed along a deforestation gradient in southern Gansu, China (2300-2600 m altitude), a high endemicity area for human alveolar echino­coccosis. Rodent distribution was assessed using removal trapping in six habitat types from timbered forest to farmland and villages, by index transects, and by the collection of specimens by local people, Species captured were 2 shrews: Anourosorex squamipes, Sorex sinalis-, 12 rodents: Eozapus setchuanus, Microtus limnophilus, Cricetulus long/- caudatus, Tscherskia triton, Apodemus agrarius, Apodemus draco, Apodemus penin- sulae, Micromys minutus, Mus muscitlus, Rattus noruegicus, Niviventer confucianus, Myospalax fontanieri\ and 1 lagomorph Ockotona thibetana. On the basis of trap success four rodent assemblages were recognized. Species richness decreases after deforestation, especially in the intermediate stage (scrubland-grassland).
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