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dc.contributor.authorOli, Madan K.
dc.contributor.authorArmitage, Kenneth
dc.identifier.citationOli, M. K., & Armitage, K. B. (2004). Yellow-bellied marmot population dynamics: demographic mechanisms of growth and decline. Ecology, 85(9), 2446–2455.
dc.description.abstractMultiple environmental factors may act synergistically to influence demographic characteristics, and ultimately the dynamics, of biological populations. Using prospective and retrospective analyses of demographic data from a 40-year study of individually marked animals, we investigated the demographic mechanisms of the temporal and spatial dynamics of a yellow-bellied marmot (Marmota flaviventris) population. Prospective elasticity analyses indicated juvenile survival (Pj) would have the largest relative influence on the projected population growth rate (l). Relative magnitudes of elasticities did not differ between years characterized by positive (l . 1.0) and negative (l , 1.0) population growth. However, retrospective analyses of a life table response experiment (LTRE) revealed that changes in fertility (F), followed by age of first reproduction (a) made the largest contributions to observed annual changes in l. Changes in F and a made the largest contributions to annual declines in l, whereas changes in Pj also were important to cause increases in l. Population dynamic differences among marmot colonies were due primarily to spatial variations in a and Pj. Our results indicate that changes in reproductive parameters (a and F) primarily drive the temporal dynamics of our study population, and that demographic mechanisms of population increases might differ from those of population declines. Studies of the regulation of yellow-bellied marmot populations should focus on the factors or processes influencing reproductive parameters.en_US
dc.description.sponsorshipWe thank Dan Blumstein, and several graduate students and technicians; this work would not have been possible without their dedicated field work. Brent Danielson and two anonymous reviewers provided many helpful comments on the manuscript. This research was supported in part by National Science Foundation grants G16354, GB-1980, GB-6123, GB-32494, BMS74-21193, DEB78-07327, BSR-8121231, BSR- 8614690, BSR-9006772 (K. B. Armitage), and DEB-0224953 (M. K. Oli), and by Florida Agricultural Experiment Station, and approved for publication as Journal Series No. R-09903.en_US
dc.publisherEcological Society of Americaen_US
dc.rightsCopyright by the Ecological Society of America
dc.subjectdemographic mechanisms of population dynamicsen_US
dc.subjectelasticity analysisen_US
dc.subjectLTRE analysisen_US
dc.subjectMarmota flaviventrisen_US
dc.subjectpartial life-cycle modelen_US
dc.subjectpopulation dynamics and regulationen_US
dc.subjectyellow-bellied marmot demographyen_US
dc.titleYellow-Bellied Marmot Population Dynamics: Demographic Mechanisms of Growth and Declineen_US
kusw.kuauthorArmitage, Kenneth
kusw.kudepartmentEcology and Evolutionary Biologyen_US
kusw.oaversionScholarly/refereed, publisher version
kusw.oapolicyThis item does not meet KU Open Access policy criteria.

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