Three pairs of the endangered Cabrera vole, Microtus cabrerae, which is endemic to the Iberian Peninsula, were captured in the wild and reared in captivity. They did not breed under standard laboratory conditions, and bred only under conditions similar to those found in wild colonies. Six litters were obtained and a total of 24 pups were monitored. Five external variables were measured and timing of 11 developmental events was recorded for each pup until it was 80 days old. Litter size was 4.0 ± 0.89 (mean ± SE; range = 3-5) pups per female, falling within the range reported for other Microtus species. Litter size of M. cabrerae was lower in the laboratory than in the field. Female body mass was correlated with litter mass at birth. Newborns were heavy (3.5 g, on average) compared with those of other Microtus species because of the relatively large size of adult M. cabrerae. Timing of the main developmental events followed a similar pattern to that observed for other species of the genus. Juvenile M. cabrerae grew fast in length during lactation, rapidly increasing their body mass during postweaning. Observations on parental behaviour in rearing pups support the previously published hypothesis that the species is monogamous. A global assessment of our results suggests that M. cabrerae should be included among the species that use the K strategy of reproduction.Résumé : Trois couples de Campagnols de Cabrera, Microtus cabrerae, espèce menacée et endémique dans la Péninsule ibérique, ont été capturés en nature et élevés en captivité. Ces campagnols ne se sont pas reproduits dans l'environnement normal de laboratoire, mais seulement lorsque les conditions qui prévalent dans les colonies naturelles ont pu être simulées. Ils ont produit six portées et, au total, 24 petits ont été suivis. Cinq variables externes ont été mesurées et la chronologie de 11 étapes du développement a été notée pour chacun des individus jusqu'à l'âge de 80 jours. Le nombre moyen de petits par portée était de 4,0 ± 0,89 (moyenne ± écart type; étendue de 3 à 5) par femelle, ce qui correspond à ce qui prévaut chez d'autres espèces de Microtus. Les portées de M. cabrerae comptaient moins de petits en laboratoire qu'en nature. Il y avait une corrélation positive entre la masse des femelles et la masse des portées à la naissance. Les nouveau-nés étaient lourds (3,5 g en moyenne) comparativement à d'autres Microtus, à cause de la taille relativement grande des adultes. La chronologie des principales étapes du développement était la même que chez les autres espèces de Microtus. Les jeunes M. cabrerae subissaient une croissance en longueur rapide au cours de l'allaitement et une augmentation de masse au cours de la période suivante. L'observation du comportement des parents durant l'élevage des petits apporte des arguments en faveur de l'hypothèse de la monogamie de cette espèce, telle que publiée antérieurement. Une évaluation globale de nos résultats permet de croire que M. cabrerae fait partie des espèces qui utilisent la stratégie K au cours de le...
The Cabrera vole (Microtus cabrerae) is a microtine rodent endemic to the Mediterranean bioclimatic region of the Iberian peninsula. We investigated body mass variation in a population monitored during monthly trapping sessions from April 1997 to April 1999. No significant differences in body mass were found between adult males and females; also no seasonal pattern of body mass variation was detected. Likewise, no correlation was found between the monthly body mass average and rainfall, probably due to the peculiar characteristics of the habitats used by M. cabrerae. These consist of areas with high soil moisture and high phreatic level; thus, these features act as a buffer and maintain fresh vegetation when rainfall is scarce. Consequently, body mass of the population does not depend directly on rainfall. Body mass and body condition scarcely fluctuated before summer 1998, but decreased significantly from that season to winter 1998, in coincidence with the severe drought recorded in summer-autumn 1998, which affected the quality of food available to the Cabrera vole, and resulted also in a suppression of reproduction up to 3 months. Given the predicted climate change trend in the Iberian peninsula, the particular reproduction characteristics of the Cabrera vole, and the destruction of their habitats by human activities, we strongly recommend the protection of the habitats occupied by this rodent species.
F ir st r e p o r t o f S ip h o n a p t e r a in f e s t in g M ic r o t u s ( M ic r o t u s ) c abrerae (Ro d e n t ia -M u r id a e -A r v ic o l in a e ) in C u e n c a , S p a in AND NOTES ABOUT THE MORPHOLOGIC VARIABILITY OF CTENOPHTHALMUS (C TENOPHTHALMUS)APERTUS PERSONATUS (I NSECTA-SlPHONAPTERA-CTENOPHTHALMIDAE)GÓ MEZ M.S.*, FERÁ NANDEZ-SALVADOR R.** & GARCIA R.** Summary:The Résum é : P r e m iè r e o b s e r v a t io n d e S ip h o n a p t e r a c h e z M ic r o t u s ( M ic r o t u s ) c a b r e r a e ( R o d e n t ia -M u r id a e -A r v ic o l in a e ) en E s p a g n e ET NOTE SUR LA VARIABILITÉ MORPHOLOGIQUE DE CTENOPHTHALM US ( C t e n o p h t h a l m u s ) a p e r t u s p e r s o n a t u s ( I n se c t a -S ip h o n a p t e r a -C t e n o p h t h a l m id a e )Les puces des M icrotus (Microtus)
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