Survival of Captive-Born Cross-Fostered Juvenile Columbian Ground Squirrels in the Field

Murie, Jan O.; Stevens, Scott D.; Leoppky, B.

doi:10.2307/1383006

Cited by 18 publications

(27 citation statements)

References 15 publications

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“…Nest burrows of gestating females were identified through behavioral observations (see Murie et al 1998) and marked with colored flags. Females from three colonies were caught within 2 days of expected parturition and transported to a nearby field station.…”

Section: After the Mating Eventmentioning

confidence: 99%

“…Females from three colonies were caught within 2 days of expected parturition and transported to a nearby field station. Females were housed indoors in polycarbonate cages (48×27×20 cm) enclosed in black covers (see Murie et al 1998). The caged females were fed fresh lettuce and apple twice a day as well as a grain mixture (a molasses-enriched colt feed) provided ad libitum.…”

Section: After the Mating Eventmentioning

confidence: 99%

“…Tissue samples were stored in 95% EtOH and later used to determine paternity. Females and their litters were returned to the colonies the next day (for details, see Murie et al 1998). In the fourth and fifth colonies, tissue for paternity analysis was collected from the ear at juvenile emergence (age 27 days).…”

Section: After the Mating Eventmentioning

confidence: 99%

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Male reproductive tactics to increase paternity in the polygynandrous Columbian ground squirrel (Urocitellus columbianus)

Raveh

Heg

Viblanc

et al. 2010

Behav Ecol Sociobiol

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In polyandrous and polygynandrous species where females mate with multiple partners, males are expected to maximize their fitness by exhibiting an array of reproductive behaviors to ensure fertilization success, such as competing for the best mating order within a mating sequence, optimizing their investment in copulation, and mate guarding. Though there is genetic evidence of a first-male precedence in siring success for many mammalian species, the causes of this effect are poorly understood. We studied influences on first-male precedence in Columbian ground squirrels (Urocitellus columbianus). We found that the time a male spent consorting and mate guarding declined with his mating order (both the highest for the first male to mate). Mate guarding by the first male significantly reduced, but did not exclude, the number of additional males a female accepted. Later mating males reduced the time spent consorting, suggesting a perceived decreased chance of fertilization success. Consortship and mate guarding durations were positively related to the male's siring success and to each other, suggesting that males adjusted these behaviors strategically to increase their chances of fertilization success. Our results suggest that besides being the first male to consort, first-male sperm precedence is further enhanced through longer mating bouts and by suppressing the chances and/or efforts of later mating males.

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Section: After the Mating Eventmentioning

confidence: 99%

Section: After the Mating Eventmentioning

confidence: 99%

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Male reproductive tactics to increase paternity in the polygynandrous Columbian ground squirrel (Urocitellus columbianus)

Raveh

Heg

Viblanc

et al. 2010

Behav Ecol Sociobiol

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“…Ages of females were not known with certainty on some of the meadows, but yearling, two-year-old and older females can be discerned by a combination of body mass (much lower for yearlings than older females at spring emergence) and condition of the nipples (folded under the skin for females that have not lactated before). After giving birth, mothers kept dependent young in single-entrance nest burrows during lactation [38]. At about the time of weaning, juveniles were captured within 48 h of first emergence from nest burrows, in either National live traps or multiple-capture traps [38].…”

Section: (C) Mating and Sampling Of Littersmentioning

confidence: 99%

“…After giving birth, mothers kept dependent young in single-entrance nest burrows during lactation [38]. At about the time of weaning, juveniles were captured within 48 h of first emergence from nest burrows, in either National live traps or multiple-capture traps [38]. The young were then ear tagged, weighed, dye marked and examined for fleas (0 ¼ no ectoparasites, 1 ¼ parasitized).…”

Section: (C) Mating and Sampling Of Littersmentioning

confidence: 99%

Ectoparasites and fitness of female Columbian ground squirrels

Raveh

Neuhaus

Dobson

2015

Phil. Trans. R. Soc. B

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Parasites play an important role in the evolution of host traits via natural selection, coevolution and sexually selected ornaments used in mate choice. These evolutionary scenarios assume fitness costs for hosts. To test this assumption, we conducted an ectoparasite removal experiment in free-living Columbian ground squirrels ( Urocittelus columbianus ) in four populations over three years. Adult females were randomly chosen to be either experimentally treated with anti-parasite treatments (spot-on solution and flea powder, N = 61) or a sham treatment (control, N = 44). We expected that experimental females would show better body condition, increased reproductive success and enhanced survival. Contrary to our expectations, body mass was not significantly different between treatments at mating, birth of litter or weaning of young. Further, neither number nor size of young at weaning differed significantly between the two treatments. Survival to the next spring for adult females and juveniles was not significantly different between experimental and control treatments. Finally, annual fitness was not affected by the treatments. We concluded that females and their offspring were able compensate for the presence of ectoparasites, suggesting little or no fitness costs of parasites for females in the different colonies and during the years of our experiments.

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Measuring fitness and inferring natural selection from long-term field studies: different measures lead to nuanced conclusions

Viblanc

Saraux

Tamian

et al. 2022

Behav Ecol Sociobiol

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Survival of Captive-Born Cross-Fostered Juvenile Columbian Ground Squirrels in the Field

Cited by 18 publications

References 15 publications

Male reproductive tactics to increase paternity in the polygynandrous Columbian ground squirrel (Urocitellus columbianus)

Male reproductive tactics to increase paternity in the polygynandrous Columbian ground squirrel (Urocitellus columbianus)

Ectoparasites and fitness of female Columbian ground squirrels

Measuring fitness and inferring natural selection from long-term field studies: different measures lead to nuanced conclusions

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