An Analysis of a Method for Comparing Residents and Colonists in a Natural Population of Microtus ochrogaster

Danielson, Brent J.; Johnson, Michael L.; Gaines, Michael S.

doi:10.2307/1381134

Cited by 15 publications

(5 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Movements between cropfields and their borders were estimated from the percentage of C. laucha individuals that moved between them. The relationships between the numbers of resident and colonizing individuals was studied by means of the method of Danielson et al (1986).…”

Section: Methodsmentioning

confidence: 99%

Competitive interactions among rodents (Akodon azarae, Calomys laucha, Calomys musculinus and Oligoryzomys flavescens) in a two-habitat system. II. Effect of species removal.

Busch¹,

Kravetz²

1992

Mammalia

View full text Add to dashboard Cite

Competitive relationships between rodent species were studied in pampean agrosystems. Akodon azarae, Calomys laucha, Calomys musculinus and Oligoryzomys flavescens show a differential spatial distribution between cropfields and their borders in this system. The goal of this paper was to assess the role of competition in determining spatial distributions and relative abundances of these species. A removal experiment in border habitats showed that the removal of A. azarae causes an increase in captures, survival and residency time in C. laucha and O. flavescens (as compared to control areas). Removal of C. laucha didn't cause any change in the remaining species. Results showed that competition with A. azarae limits the use of field borders by C. laucha and O. flavescens. Presence of A. azarae in border habitats prevents the establishment of residents of C. laucha and O. flavescens, thereby causing also higher mortality and lower reproductive rates in these two species than those registered when A. azarae is removed. Interspecific encounters in a test arena showed that behavioral interactions are contributing to spatial segregation, with A. azarae becoming dominant over C. laucha.Resume. -La competition entre les especes de rongeurs a etc etudiee dans les agrosystemes de la pampa. Akodon azarae, Calomys laucha, C. musculinus et Oligoryzomys flavescens y montrent des differences de repartition dans les cultures et leurs bordures. Le but de ce travail a etc de determiner le röle de la competition dans la distribution spatiale et 1'abondance relative de ces especes. En retirant du terrain une espece apres 1'autre on constate que les autres especes modifient leur occupation du sol et que la mortalite et la reproduction de chacune sont affectees. Des rencontres experimentales en captivite mettent en evidence les modifications comportementales responsables de la segregation spatiale, A. azarae devenant dominant sur C. laucha.

show abstract

Section: Methodsmentioning

confidence: 99%

Competitive interactions among rodents (Akodon azarae, Calomys laucha, Calomys musculinus and Oligoryzomys flavescens) in a two-habitat system. II. Effect of species removal.

Busch¹,

Kravetz²

1992

Mammalia

View full text Add to dashboard Cite

show abstract

“…Mass categories have often been used to classify young voles as either site born or immigrant (e.g. Dueser et al 1984;Boonstra et al 1987); however, mass is not totally reliable (Tamarin 1984;Tamarin and Sheridan 1987;Danielson et al 1986). Although we use more conservative mass cutoffs than those used in previous studies (Beacham 1979;Hilborn 1975), some individuals thought to be immigrants may have been born on the grid and escaped capture for a month.…”

Section: Radiotelemetry Techniquesmentioning

confidence: 99%

Spatial organization and mating system of Microtus townsendii

Lambin

Krebs

1991

Behav Ecol Sociobiol

View full text Add to dashboard Cite

Space use by individual Townsend's voles, Microtus townsendii, was investigated in spring and summer by means of radiotelemetry and intensive live trapping in undisturbed grasslands near Vancouver, British Columbia. Home ranges of males were larger than those of females; females had significantly larger ranges in spring than in summer. Most males and females maintained territories free of individuals of the same sex in spring. Male-female pairs had their exclusive territories closely overlapping each other. The 1 : 1 operational sex ratio and the spatial association of pairs of males and females suggest that the voles were monogamous in the spring of 1988 and that 50% of the males were monogamous in the spring of 1989. In summer, there was more intrasexual overlap between home ranges of males and females and female ranges were considerably smaller than those of males. Females were more philopatric than males and females thought to be members of the same family group lived adjacent to each other or had overlapping home ranges. Males overlapped with more than one female in summer, but most females still overlapped with only one male, which suggests that the mating system is polygynous in summer. Thirty-five percent of the philopatric females became pregnant for the first time when the male spatially associated with their mother in the spring was still alive and thus could potentially have mated with their fathers. Male and female territoriality in spring is the proximate mechanism for the limitation of breeding density by spacing behaviour.

show abstract

“…Body mass of some adults decline to less than 30 g during winter, resulting in immigrants being misidentified as young born in the site. Danielson et al (1986), Tamarin and Sheridan (1987), Dueser (1989, 1990), and Pugh and Tamarin (1991) indicated that there is obvious bias in identifying immigrants by body mass alone, but that such a method appears a logical, albeit conservative, method for use in open populations. With no other method available to identify immigrants, we used body mass > 30 g for identifying immigrants, taking into account the above discussions and the following observations from our study:…”

Section: Discussionmentioning

confidence: 99%

The influence of immigration on demography of sympatric voles

et al. 2005

View full text Add to dashboard Cite

2005. The influence of immigration on demography of sympatric voles. Acta Theriologica 50: 323-342.We studied the influence of immigration on the dynamics of Microtus ochrogaster Wagner, 1842 and M. pennsylvanicus Ord, 1815 populations in alfalfa, bluegrass, and tallgrass prairie in east-central Illinois for 25 years. The numbers of immigrants in a site were positively correlated with overall population densities of the species in the vicinity of the study sites and within the study site. Population density of the other species was not correlated with immigration of either species. Immigrants did not differ significantly from residents with respect to sex-ratio and reproductive condition. Persistence of immigrant M. pennsylvanicus was lower than that of resident adults in all three habitats, while that of immigrant M. ochrogaster was lower than that of resident adults in alfalfa, where the species was most abundant. Neither the absolute number of immigrants nor the proportion of the population composed of immigrants indicated an effect of immigrants on among-and within-habitat differences in demography and population fluctuations of either species. Immigrants may have been an important factor in maintenance of M. pennsylvanicus in alfalfa, a low-quality habitat, but the influence of immigration on the dynamics of populations inhabiting other habitats was insubstantial.

show abstract

An Analysis of a Method for Comparing Residents and Colonists in a Natural Population of Microtus ochrogaster

Cited by 15 publications

References 10 publications

Competitive interactions among rodents (Akodon azarae, Calomys laucha, Calomys musculinus and Oligoryzomys flavescens) in a two-habitat system. II. Effect of species removal.

Competitive interactions among rodents (Akodon azarae, Calomys laucha, Calomys musculinus and Oligoryzomys flavescens) in a two-habitat system. II. Effect of species removal.

Spatial organization and mating system of Microtus townsendii

The influence of immigration on demography of sympatric voles

Contact Info

Product

Resources

About