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

Content Provider	Springer Nature Link
Author	Priotto, José Gómez, Daniela Polop, Jaime
Copyright Year	2009
Abstract	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 (λ), apparent survival (ϕ) and seniority probability (γ) were estimated using capture–mark-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 ϕ and γ. The best models for ϕ and γ 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 variation of γ. 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.
Starting Page	521
Ending Page	529
Page Count	9
File Format	PDF
ISSN	09123814
Journal	Ecological Research
Volume Number	25
Issue Number	3
e-ISSN	14401703
Language	English
Publisher	Springer Japan
Publisher Date	2010-01-05
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Population growth Seniority Sigmodontinae Small mammals Survival Forestry Behavioural Sciences Evolutionary Biology Zoology Plant Sciences Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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