| climate change is affecting altitudinal migrants and hibernating species. | calendar date of the beginning of the growing season at high altitude in the colorado rocky mountains is variable but has not changed significantly over the past 25 years. this result differs from growing evidence from low altitudes that climate change is resulting in a longer growing season, earlier migrations, and earlier reproduction in a variety of taxa. at our study site, the beginning of the growing season is controlled by melting of the previous winter's snowpack. despite a trend for warm ... | 2000 | 10677510 |
| influence of local demography on asymptotic and transient dynamics of a yellow-bellied marmot metapopulation. | despite recent advances in biodemography and metapopulation ecology, we still have limited understanding of how local demographic parameters influence short- and long-term metapopulation dynamics. we used long-term data from 17 local populations, along with the recently developed methods of matrix metapopulation modeling and transient sensitivity analysis, to investigate the influence of local demography on long-term (asymptotic) versus short-term (transient) dynamics of a yellow-bellied marmot ... | 2009 | 19249978 |
| effects of patch quality and network structure on patch occupancy dynamics of a yellow-bellied marmot metapopulation. | 1. the presence/absence of a species at a particular site is the simplest form of data that can be collected during ecological field studies. we used 13 years (1990-2002) of survey data to parameterize a stochastic patch occupancy model for a metapopulation of the yellow-bellied marmot in colorado, and investigated the significance of particular patches and the influence of site quality, network characteristics and regional stochasticity on the metapopulation persistence. 2. persistence of the y ... | 2006 | 16903056 |