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<p>We report responses of the deer mouse (<i>Peromyscus maniculatus</i>) and yellowpine chipmunk (<i>Neotamias amoenus</i>) to large-scale (25&#xa0;ha) application of supplemental food in lodgepole pine (<i>Pinus contorta</i> var. <i>latifolia</i>) forest in southern British Columbia, Canada. We tested three hypotheses (H) that enhanced food supply will: (H<sub>1</sub>) increase abundance, reproduction, and survival; (H<sub>2</sub>) increase the proportion of young-of-the-year breeding and body mass; and (H<sub>3</sub>) prevent a decline in density at the start of breeding. Populations of deer mice reached mean abundance levels 2 to 3 times higher on food than control sites. Mean density per ha of <i>P. maniculatus</i> in each of the two years ranged from 5 to 8 and near 7 on control sites and from 4 to 14 and 20 to 24 on food sites. This difference in mean abundance was driven by high numbers of juvenile recruits, early juvenile productivity, and mean total summer survival in food than control sites; and supported H<sub>1</sub>. A higher proportion of male young-of-the-year were breeding in food than control sites but mean body mass of adult <i>P. maniculatus</i> was equivocal, thereby providing only partial support for H<sub>2</sub>. There was a slight decline in density in two (2.2% and 14.0%) of four spring populations in the control sites, and none in the food sites, thereby providing only weak support for H<sub>3</sub>. Yellow-pine chipmunk populations showed no difference in abundance or other demographic attributes between treatment sites, and hence H<sub>1</sub> to H<sub>3</sub> were not supported. Continued application of supplemental food at this scale, over several years, and with additional replication could maintain the dramatic difference in mean abundance between treatment sites.</p>

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Short-term responses of Peromyscus maniculatus and Neotamias amoenus populations to large-scale supplemental feeding

  • 期刊论文

  • 发表日期：

    2026年2月14日

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  • Thomas P. Sullivan,
  • Chris M. Kohler,
  • Douglas B. Ransome

摘要

We report responses of the deer mouse (Peromyscus maniculatus) and yellowpine chipmunk (Neotamias amoenus) to large-scale (25 ha) application of supplemental food in lodgepole pine (Pinus contorta var. latifolia) forest in southern British Columbia, Canada. We tested three hypotheses (H) that enhanced food supply will: (H1) increase abundance, reproduction, and survival; (H2) increase the proportion of young-of-the-year breeding and body mass; and (H3) prevent a decline in density at the start of breeding. Populations of deer mice reached mean abundance levels 2 to 3 times higher on food than control sites. Mean density per ha of P. maniculatus in each of the two years ranged from 5 to 8 and near 7 on control sites and from 4 to 14 and 20 to 24 on food sites. This difference in mean abundance was driven by high numbers of juvenile recruits, early juvenile productivity, and mean total summer survival in food than control sites; and supported H1. A higher proportion of male young-of-the-year were breeding in food than control sites but mean body mass of adult P. maniculatus was equivocal, thereby providing only partial support for H2. There was a slight decline in density in two (2.2% and 14.0%) of four spring populations in the control sites, and none in the food sites, thereby providing only weak support for H3. Yellow-pine chipmunk populations showed no difference in abundance or other demographic attributes between treatment sites, and hence H1 to H3 were not supported. Continued application of supplemental food at this scale, over several years, and with additional replication could maintain the dramatic difference in mean abundance between treatment sites.