No island-effect on glucocorticoid levels for a rodent from a near-shore archipelago.

摘要: Island rodents are often larger and live at higher population densities than their mainland counterparts, characteristics that have been referred to as "island syndrome". syndrome has well studied, but few studies tested for island-mainland differences in stress physiology. We evaluated island within the context of physiology white-footed mice (Peromyscus leucopus) captured from 11 islands five sites Thousand Islands National Park, Ontario, Canada. Stress was by quantifying corticosterone (a biomarker), primary glucocorticoid mice, hair its related metabolites fecal samples. White-footed this near-shore archipelago did not display syndrome, nor levels or compared with mice. suggest experience similar degrees mainland. Although we find evidence levels, identified relationships between internal (sex, body mass) external (season) factors our hormonal indices