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The gastrointestinal nematodes of Paramelomys lorentzii and Mammelomys spp. (Rodentia: Muridae) with descriptions of a new genus and three new species (Heligmonellidae) from Papua New Guinea and Indonesia

100%

Smales L. R.

Acta Parasitologica

2017

tom 62

nr 4

Social structure in synanthropic populations of a murid rodent Mastomys natalensis in Senegal

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Granjon L. , Duplantier J. M.

Acta Theriologica

1993

tom 38

nr 1

Synanthropic populations of Mastomys natalensis (A. Smith, 1834) were studied in southeastern Sénégal in order to evaluate some elements of their social structure. Analysis of trapping data consisting in single and multiple captures indicates that adult males were less likely to be involved in multiple captures than any other category of individuals. Sex-ratio in adults was significantly female-biased, and multiple captures involving 4 individuals or more (up to 13) were characterized by the small number of adult males involved (usually one per capture). Dyadic encounters between males revealed a higher rate of aggressive behaviours in M. natalensis than in its sibling species M. huberti. These observations suggest that these synanthropic populations are subdivided in polygynous units in which: (1) a part of males are evicted from the social group before their maturity and (2) adult males of different social units display aggressive behaviour towards each other.

Reproductive characteristics of free-living Calomys venustus [Rodentia, Muridae]

100%

Polop J. J. , Provensal M. C. , Dauria P.

2005

tom 50

nr 3

Calomys venustus showed a cyclic seasonal pattern of reproductive activity characterized by a period of repose and a variable length of the period of sexual activity between August—September to May—June. The study was done from 1983 to 1999. During this time the population density increased from October—November to the end of autumn and sharply decreased in winter. Three peaks in rate of pregnancy were recognized in the breeding period: spring, summer and late summer. The average litter size was different among the three peaks in rate of pregnancy. The reproductive pattern had a peak at the beginning of the spring produced by overwintering animals, and another peak in summer-autumn caused by the reproductive activity of young born in the same period in which they breed. The spring cohort exhibited the greatest breeding contribution suggesting that this cohort is principally responsible for the yearly peak in abundance.