Effects of Female Immigrants on Demography and Social Organization of Prairie Vole (Microtus Ochrogaster) Populations

Lin, Ying-Chen; Hayes, Loren D.; Solomon, Nancy G.

doi:10.1644/bel-013

Cited by 11 publications

(12 citation statements)

References 45 publications

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“…To find differences in these parameters, it would be crucial to increase the sample size from 15 to 20 females, which would increase the statistical power from 60% to 90%. One needs to be cautious about some biologically significant effects that might have been missed because of the small sample sizes (Steidl et al 1997, Lin et al 2004.…”

Section: Resultsmentioning

confidence: 99%

Do polygynous males of Akodon azarae (Rodentia: Sigmodontinae) vary their mating tactics at low availability of females?

et al. 2014

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We examined in Akodon azarae if at low availability of females (sex ratio biased toward males, 3:1), the mating tactics of males are determined by the number of receptive females to which they have access, or by the number of male competitors with which they interact. To test these hypotheses, we measured the home range size and overlap degree. At the beginning of the reproductive season, we studied spacing patterns using 57 and 30 home ranges established by reproductive males and females in three enclosure populations. We statistically compared our results with those previously obtained in enclosure populations with a sex ratio of 1:1. Male home range sizes were larger than those recorded in populations with a sex ratio of 1:1. The degree of male intra-sexual overlap increased about 3.5 times with respect to that observed under a sex ratio of 1:1. The increase in home range sizes and intra-sexual overlap degree of reproductive males reflects that A. azarae males may adjust their spacing strategy to increase their mating opportunities at low density of females. Our results suggest that at low breeding female availability, male mating tactics could be determined by the number of receptive females to which they have access.

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Section: Resultsmentioning

confidence: 99%

Do polygynous males of Akodon azarae (Rodentia: Sigmodontinae) vary their mating tactics at low availability of females?

et al. 2014

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“…The results of this study support the findings that dispersal can have profound effects on the structure and stability of a population (Bowler and Benton 2005). The presence of immigrants can induce change in local social organization (Lin et al . 2004), in combination with loss of resident individuals.…”

Section: Discussionmentioning

confidence: 99%

Replacement dolphins? Social restructuring of a resident pod of Atlantic bottlenose dolphins, Tursiops truncatus, after two major hurricanes

Elliser¹,

Herzing²

2010

Marine Mammal Science

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Environmental variations can influence the structure of ecological communities that in turn alter the grouping and association patterns of social communities. This study compares the social structure of bottlenose dolphins in the Bahamas before and after two major hurricanes. Approximately 30% of regularly seen individuals disappeared after the hurricanes, with an equal number of immigrants arriving afterwards. The primary goal of this study was to quantitatively describe social structure changes occurring after this large-scale emigration (or death) and subsequent immigration of individuals using the social analysis program, SOCPROG 2.3. The pre-hurricane results revealed one community with association patterns that were consistent with previous work on this population as well as other welldocumented populations. Post-hurricane associations revealed that the community split into two distinct units, whose members associated highly within, but rarely between units. Association patterns varied between units. Immigrants assimilated well into the population, especially males. Over half of the post-hurricane associations involved immigrants, the majority between residents and immigrants, and primarily involving immigrant males. The costs/benefits of choosing to associate with an immigrant individual differ between males and females and may have been the driving force for the changes in social structure that occurred.

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“…Besides, the low number of replicates reduced our statistical power to find differences in this parameter estimation between control and experimental enclosures (the statistical power increased in 40% considering the quadruple number of replicates). One needs to be cautious that some biologically significant effects might have been missed due to the small sample sizes (Steidl et al 1997;Lin et al 2004). Pradel's model does not differentiate between reproduction and immigration as different sources of recruitment.…”

Section: Discussionmentioning

confidence: 99%

“…The presence of adult animals can cause poor survival, sexual maturation inhibition, reproduction delay, or lack of reproduction of juveniles (Rodd and Boonstra 1988;Wolff et al 2001Wolff et al , 2002. Therefore, slight decreases in juvenile performance (survival and reproduction) caused by the presence of adults can deeply reduce the growth of a population (Lin et al 2004). Thus, changes in population age structure would determine differences in population abundances.…”

Section: Introductionmentioning

confidence: 99%

A demographic analysis of population responses to the manipulation of adult males in Calomys venustus (Rodentia, Sigmodontinae)

Priotto

Gomez

Polop

2010

Ecological Research

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In many species of mammals, adults play an important role in influencing the survival and/or reproduction of juveniles. Adult males could have a negative effect on population density when their absence becomes a limiting factor in female fertilization. We tested the hypotheses that the absence of overwintering males (adult males) reduces the population growth rate through a delay in the onset of reproductive activity of Cohort 1 females in Calomys venustus populations. The study was carried out in two control and two experimental enclosures (0.25 ha). Adult males were removed after their offspring were born. Weekly trapping sessions were carried out from spring to autumn. To estimate population growth rates (k), apparent survival (/) and seniority probability (c) were estimated using capturemark-recapture models. Models were constructed with these two parameters and recapture probability (p) constrained to vary as a function of time, enclosure and/ or treatment. We derived estimates of population growth rates through the estimates of / and c. The best models for / and c did not show a treatment effect. Variability between the four enclosures was greater than between control and experimental enclosures. Enclosures had different growth rates at the beginning of the study but were equaled at the end. Temporal variation in population growth rates was a result of temporal vari-ation of c. The two controls showed the highest growth rates earlier in time. The results did not support the hypothesis tested in this study. It seems that the number of overwintering males do not affect the population growth rate.

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Effects of Female Immigrants on Demography and Social Organization of Prairie Vole (Microtus Ochrogaster) Populations

Cited by 11 publications

References 45 publications

Do polygynous males of Akodon azarae (Rodentia: Sigmodontinae) vary their mating tactics at low availability of females?

Do polygynous males of Akodon azarae (Rodentia: Sigmodontinae) vary their mating tactics at low availability of females?

Replacement dolphins? Social restructuring of a resident pod of Atlantic bottlenose dolphins, Tursiops truncatus, after two major hurricanes

A demographic analysis of population responses to the manipulation of adult males in Calomys venustus (Rodentia, Sigmodontinae)

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