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Community ecology of the terrestrial small mammals of Zakouma National Park, Chad

100%

Granjon L., Houssin C., Lecompte E., Angaya M., Cesar J., Cornette R., Dobigny G., Denys C.

Acta Theriologica

2004

tom 49

nr 2

The terrestrial small mammal community of the Zakouma National Park (Chad) was assessed by live trapping in various habitats during the dry season. Nearly 3000 trap-nights yielded 505 captures of nine rodent and two shrew species, making up a representative small mammal community for the Sudanian savanna biotic zone. Murine rodents of the genus Mastomys dominated, with M. erythroleucus and M. cf. kollman- nspergeri occuring at similar abundances. The former was widespread and especially abundant in habitats with high tree cover. The latter was more localized, predominantly in annually flooded habitats characterized by a clay-rich soil, often with Acacia seyal as the main vegetation. Population structure differed between the two species, suggesting distinct reproductive strategies possibly linked with habitat preferences: the M. erythroleucus population comprised mainly young, immature individuals, whereas M. cf. kollmannspergeri was represented by older individuals, a significant fraction of which had already reproduced. Taterillus congicus and Tatera kempi (gerbilline rodents), togetjier with Lemniscomys zebra, were mainly found in more open habitats with sand-rich soils. Arvicanthis niloticus, Acomys cf. johannis, Mus mattheyi and Xerus erythropus were the other rodents captured, whereas shrews were represented by Crocidura fulvastra and Suncus sp.

A quantitative study of diet in three species of rodents in natural and irrigated savanna fields

80%

Rabiu S., Rose R. K.

Acta Theriologica

1997

tom 42

nr 1

During July, 1990 - June, 1992 we collected stomach contents of necropsied rodents that totalled 494 Arvicanthis niloticus (Desmarest, 1822), 356 Mastomys natalensis (Smith, 1834) and 273 Tatera valida (Wroughton, 1906) from natural, savanna fields in Nigeria, and 528 Arvicanthis and 367 Mastomys from nearby irrigated fields, where Tatera was never trapped. The materials were processed and microscopically analyzed to determine patterns of diet selection. Sites were sampled for vegetative cover and rodent food resources. More than 90% of the stomach materials could be identified to one of four categories: dicots (vegetative), monocots (vegetative), seeds, and insects. Seeds constituted approximately 50% by mass of foods consumed by all species in both sites during the rains. Mastomys (in both sites) and Tatera maintained the same levels of seed intake year around. Unlike Mastomys, the amount of seeds consumed by Arvicanthis was enhanced by irrigation. In both sites during the rains, monocots and insects made up 12-46% and 14-26% of the rodents diet respectively, but their importance diminished in the natural site during the dry seasons. Tests of MANOVA indicated significant species differences and effects of site, season and their interactions on foods selected. A few plant species dominated the vegetative cover, and dramatic differences in the quality of seasonal herbage were observed.

Ograniczanie wyników

2 Acta Theriologica

1 Angaya M.

1 Cesar J.

1 Cornette R.

1 Denys C.

1 Dobigny G.

1 Granjon L.

1 Houssin C.

1 Lecompte E.

1 Rabiu S.

1 Rose R. K.

1 2004

1 1997

Wyniki wyszukiwania

Community ecology of the terrestrial small mammals of Zakouma National Park, Chad

A quantitative study of diet in three species of rodents in natural and irrigated savanna fields