<p>Sexually dimorphic ungulates, males and females adopt different habitat use strategies depending on predation risk and forage availability. Males prioritize foraging to improve body condition, while females prioritize safety to enhance survival. Although sex-specific habitat use is well-documented in sexually dimorphic cervids, empirical evidence on how human-related factors, such as culling pressure and forest clearings, affect these patterns remains scarce. We investigated differences in habitat use between the sexes in sika deer (<i>Cervus nippon</i>) by conducting spring spotlight censuses in the northern foothills of Mt. Fuji, Japan. We analyzed the effects of environmental variables, including culling and logged area coverage, the presence of dwarf bamboo, and slope steepness, on the occurrence of each sex. Males were observed significantly more frequently in regions with greater culling area coverage than females, whereas females were observed significantly more frequently in regions with greater logged area coverage than males. The spatial scale of resource-rich yet high-risk culling and logged areas differed. Culling areas formed large contiguous tracts (two sites comprising approximately 51.04% of the survey area) and appeared to influence habitat use at broader scales, whereas logged patches were small and fragmented (312 sites comprising approximately 4.34% of the survey area) and influenced habitat use at finer scales. Therefore, our results suggest that males prefer high-risk and resource-rich environments at broader scales, whereas females avoid risk at broader scales but select resource-rich patches at finer scales. Our results suggest that human-related factors, such as culling pressure and forest clearings, can drive the spatial segregation of the sexes across multiple scales.</p>

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Do culling pressure and forest clearing affect sex-specific habitat use in sika deer?

  • Keita Nakamura,
  • Hayato Takada,
  • Shinsuke Koike

摘要

Sexually dimorphic ungulates, males and females adopt different habitat use strategies depending on predation risk and forage availability. Males prioritize foraging to improve body condition, while females prioritize safety to enhance survival. Although sex-specific habitat use is well-documented in sexually dimorphic cervids, empirical evidence on how human-related factors, such as culling pressure and forest clearings, affect these patterns remains scarce. We investigated differences in habitat use between the sexes in sika deer (Cervus nippon) by conducting spring spotlight censuses in the northern foothills of Mt. Fuji, Japan. We analyzed the effects of environmental variables, including culling and logged area coverage, the presence of dwarf bamboo, and slope steepness, on the occurrence of each sex. Males were observed significantly more frequently in regions with greater culling area coverage than females, whereas females were observed significantly more frequently in regions with greater logged area coverage than males. The spatial scale of resource-rich yet high-risk culling and logged areas differed. Culling areas formed large contiguous tracts (two sites comprising approximately 51.04% of the survey area) and appeared to influence habitat use at broader scales, whereas logged patches were small and fragmented (312 sites comprising approximately 4.34% of the survey area) and influenced habitat use at finer scales. Therefore, our results suggest that males prefer high-risk and resource-rich environments at broader scales, whereas females avoid risk at broader scales but select resource-rich patches at finer scales. Our results suggest that human-related factors, such as culling pressure and forest clearings, can drive the spatial segregation of the sexes across multiple scales.