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Winter weather conditions result in temporal niche overlap among three sympatric medium-sized carnivores in northeastern Japan

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Abstract

Temporal niche partitioning may be influenced not only by interspecific competition, but also by weather conditions. Decreased food availability and dietary overlap between species can increase the degree of interspecific competition during winter, thereby promoting temporal niche partitioning. However, multiple species can be simultaneously active under similar weather conditions (high temperature and little snowfall) in winter to reduce energy costs and increase temporal niche overlap. In this study, we aimed to determine the degree of temporal niche partitioning among red foxes (Vulpes vulpes), raccoon dogs (Nyctereutes procyonoides), and Japanese martens (Martes melampus), and its variation with seasonal climate change in terms of interspecific competition and weather conditions. We obtained data on the target species through a camera-trap survey conducted in a heavy snowfall area in northeastern Japan. We analyzed the degree of temporal niche partitioning based on diel activity overlap, co-occurrence rates per night, and behavioral avoidance within 1 or 2 h. We also evaluated the relationship between the presence or absence of activity per night and nightly weather conditions (temperature, precipitation (snowfall), moonlight). We observed a high degree of temporal niche overlap among the three species. In particular, the degree of temporal niche overlap was higher in winter than that in other seasons because the activity of the three species was greatly affected by low temperatures and snowfall in winter. As a winter survival strategy, coping with the weather may be more important than avoiding competition. Our results conflict with the hypothesis predicting temporal niche partitioning in winter, suggesting that weather effects can be an important factor in varying temporal niche partitioning among carnivores.

Significance statement

This study revealed that the temporal niche overlap of three carnivores in northeastern Japan was higher in winter than that in other seasons because they were simultaneously active under similar weather conditions (high temperature and little snowfall) in winter to reduce energy costs. This indicates that coping with the weather may be more important than avoiding interspecific competition as a winter survival strategy. Our results conflict with the hypothesis predicting temporal niche partitioning among carnivores in winter due to restricted food resources and dietary overlap. This suggests that the different degrees of weather effects can be an important factor in varying temporal niche partitioning among carnivores. Because extreme changes in weather conditions such as extremely high temperatures, blizzards, and heavy rains, have occurred worldwide in recent years, weather conditions may significantly affect the niche partitioning among carnivores distributed in different environments worldwide.

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Data availability

The datasets used and/or analyzed during the current study are available from the supplementary information.

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Acknowledgements

We thank the associates of the Yamagata University and the staff of Experimental Forest of the Yamagata University for supporting our field survey, and f the people in Kaminagawa and Nishiaraya communities in Tsuruoka City for permitting our field survey. We also thank Dr. H. Enari for providing helpful comments on this study and Dr. H. Tsunoda for providing helpful comments on data analysis and literature for this study. We are grateful to anonymous reviewers for improving an earlier draft of our manuscript.

Funding

This work was partly supported by YU-COE (M) grant from Yamagata University to MUS.

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Authors

Contributions

RW and MUS conceived and designed the study, RW conducted the data collection and statistical analyses, and RW and MUS wrote the manuscript.

Corresponding author

Correspondence to Masayuki U. Saito.

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The procedures of this study were in accordance with the national laws of Japan. Ethical approval from ethics committee for involving animals was not required.

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The authors declare no competing interests.

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Communicated by B. Voelkl

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Watabe, R., Saito, M.U. Winter weather conditions result in temporal niche overlap among three sympatric medium-sized carnivores in northeastern Japan. Behav Ecol Sociobiol 76, 164 (2022). https://doi.org/10.1007/s00265-022-03271-w

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  • DOI: https://doi.org/10.1007/s00265-022-03271-w

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