Figures & data
TABLE 1 Summary of mean temperature and precipitation range during different seasons in the study area.
TABLE 2 Summary statistics for linear mixed effects models testing for significant interannual variations (2008 vs. 2009, 2010, 2011) in adult and juvenile pika population abundances, snow cover period, annual mean snow depth, spring snow depth, and food availability at the study area (n = 10).
FIGURE 1. Relative abundance of Royle's pika in different habitat types of the alpine and timberline-subalpine zones during the predispersal period (May–August) from 2008 to 2011 (except for July–August 2010 and May 2011); light colored bars represent juvenile pika and dark colored bars represent adult pika abundance. Values are means ± S.E.
TABLE 3 Relative support for various candidate models testing competing ecological postulates. The postulates are for factors affecting abundance of Royle's pika using information theoretic criteria for different study plots (n = 10; AICc values = Akaike's information criterion, Log(L) = likelihood, K = number of modeled parameters, ΔAICc = the difference between the model indicated and the best model [the model with lowest AICc], and Wi = Akaike weights).
TABLE 4 Estimated influences of parameters (snow cover period, spring snow depth, food availability, rock cover, and altitudinal zone) on adult and juvenile Royle's pika abundance measured by the best fit general linear model (minimum Akaike information criterion).
FIGURE 2. Influence of snow cover period on emergence time of juvenile Royle's pika (1 = alpine zone, 2 = timberline-subalpine zone).
Table A1 Average detection probability of Royle's pika in various habitat types during observation sessions.
