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In many social sciurids, male territoriality confers significant mating advantages. We evaluated resident male paternity in Gunnison's prairie dogs (Cynomys gunnisoni), a colonial ground-dwelling sciurid, where males and females cooperatively defend territories. Contrary to findings reported for other social sciurids, our results show that territorial resident males do not gain significant reproductive advantages. Resident males sired the majority of offspring from their respective territories only 10.5% of the time. A single non-resident male sired equal or greater number of offspring than any single resident male 71.2% of the time. While adult males were more likely to sire a greater number of offspring, standard...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Behaviour,
Cynomys,
Reproductive success,
mating system,
sociality,
Breeding aggregations of Bufo cognatus were observed in southern Arizona and southwestern New Mexico during June, July and August, 1980-82. Most breeding aggregations lasted only two or three nights following summer rainstorms. Males substantially outnumbered females at choruses, and females actively selected mates from among displaying males. Some small males adopted satellite positions near calling males, and the percentage of time a male was observed calling was significantly correlated with snout-vent length. Male mating success was positively correlated with the percentage of time a male was observed calling, but male size and mating success were not correlated. There was no indication of positive assortative...
Previous studies of Gunnison's prairie dogs, Cynomys gunnisoni, have reached different conclusions about the factors influencing sociality in this species. In this study I tested whether Gunnison's prairie dog social structure was resource-based or whether male mating strategies drive the organizational patterns observed. Group size, where the term group refers to individuals occupying the same territory, was predicted by territory size and density of food available. The spatial overlap of adults within territories was positively correlated with spatial patchiness of food resources. All group members participated in territory defense, although adult males engaged in significantly more intergroup aggressive interactions....
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: BRILL,
Behaviour,
Cynomys gunnisoni,
mating system,
social structure,
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