The demography of Synaptomys cooperi populations in eastern Kansas

Autor:	Robert K. Rose, Michael S. Gaines, Leroy R. McClenaghan
Rok vydání:	1977
Předmět:	genetic structures biology Ecology Early juvenile Adult population biology.organism_classification Seasonal breeder Population cycle Juvenile Population growth Animal Science and Zoology Bog lemming Synaptomys cooperi Ecology Evolution Behavior and Systematics
Zdroj:	Canadian Journal of Zoology. 55:1584-1594
ISSN:	1480-3283 0008-4301
DOI:	10.1139/z77-207
Popis:	Three populations of the southern bog lemming, Synaptomys cooperi, were livetrapped from November 1970 through July 1973 in eastern Kansas to determine whether populations of this microtine species undergo multiannual population cycles. Two of the populations (grids B and D) had such cycles, while one (grid A) exhibited an annual fluctuation in density. The intensity of breeding was generally higher in the summer than in the winter breeding seasons. Grids B and D had a higher percentage of males in breeding condition during two summer breeding seasons compared with grid A. Survival of the trappable adult population was usually higher in the winter than in the summer breeding seasons. Early juvenile survival paralleled changes in survival of the adults but average juvenile survival on grid A was lower than on grids B and D during the summer breeding season. A multiple regression analysis indicated that early juvenile survival is the best predictor of rate of population growth. High body weights in spring were associated with high population densities on grids B and D. Mean body weights of all three populations were higher in the summer than in the winter breeding seasons. Possible mechanisms for the noncyclicity on grid A are discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c66ae36287f9c637284353073b264ce9 https://doi.org/10.1139/z77-207 Zobrazit plný text záznamu