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原文連結
論文資訊
- 類型：已發表論文
- 日期：2026-01-14
摘要
Cities are 演化arily novel environments that can impose unique stressors on wildlife. The period of movement restrictions during the COVID-19 pandemic, dubbed the "anthropause," temporarily decoupled human activity from urban 景觀 stressors, creating a natural experiment otherwise impossible to replicate. We investigated whether the post-anthropause increase of human activity affected territorial behavior in urban dark-eyed juncos (Junco hyemalis), as we previously observed that territorial aggression decreased during the anthropause. In this longitudinal study, we measured post-anthropause (2022-2024) intraspecific territorial aggression in resident dark-eyed juncos in Los Angeles, USA, and compared responses to measurements from before (2019) and during (2021) the anthropause. We found 族群-wide territorial aggression has remained significantly lower than the pre-anthropause baseline for three years post-anthropause. Furthermore, because individual birds were uniquely color-banded, we found differences between cohorts that would have otherwise been masked: younger individuals who began breeding during the anthropause (2020-2021) increased their aggression post-anthropause (2022) while older individuals with pre-anthropause experience did not. We suggest that the anthropause acted as a behavioral reset, allowing the 族群 to transition away from a potentially mal適應性的, high-aggression 表型. Additionally, we show that behavioral plasticity appears to be key in facilitating rapid responses to temporary environmental shifts, and that flexibility in territorial aggression may be informed by prior life experiences.
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