Ayaka Hata

National Agriculture and Food Research Organization

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Yasuhiro Nakajima

Advanced Analysis Center

Mayura B. Takada

Chuo University

Hikaru Uno

Advanced Analysis Center

Rumiko Nakashita

Forestry and Forest Products Research Institute

Midori Saeki

National Agriculture and Food Research Organization

Tatsuki Shimamoto

Nippon Veterinary and Life Science University

Chinatsu Kozakai

National Agriculture and Food Research Organization

Keita Fukasawa

National Institute for Environmental Studies

Anna Inoue

Naoko Higuchi

Shionogi (Japan)

Cooperative Institutions

National Agriculture and Food Research Organization

Nippon Veterinary and Life Science University

Institute of Livestock and Grassland Science

The University of Tokyo

Obihiro University of Agriculture and Veterinary Medicine

Central Region Agricultural Research Center

Tokyo University of Agriculture and Technology

Institute for Biodiversity

Azabu University

Hokkaido University

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Stable isotope and DNA analyses reveal the spatial distribution of crop‐foraging brown bears

Journal of Zoology (2017)

Ayaka Hata Mayura B. Takada Rumiko Nakashita Keita Fukasawa Tatsuo Oshida

Abstract We investigated maize ( Zea mays ) consumption by brown bears ( Ursus arctos ) in a subpopulation of eastern Hokkaido, Japan, using carbon stable isotope analysis of hair samples to better understand the pattern and scale of movement of the bears’ crop‐foraging behavior. We identified a total of 30 individuals (19 males and 11 females) using DNA analysis of the hair samples. Stable isotope analysis suggested that female bears that were more likely to consume maize lived closer to agricultural crop fields. Our statistical model also estimated that the relative maize consumption of female bears decreased rapidly as the distance to crop fields increased to 3–4 km, similar to the radius of the annual home range of female bears. In contrast, male bears that were more likely to consume maize lived both in forested areas and near crop fields. Even if male bears live in a forested area except during the maize harvest period, they appeared to be at risk of being killed by lethal control because they can move from forested areas to crop fields during the maize harvest period. Collecting hair samples of many bears in the population over several years may allow the effect of lethal control on population viability to be estimated non‐invasively.

Isotope Analysis

10.1111/jzo.12479

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Citations (10)

Occurrence patterns of crop-foraging sika deer distribution in an agriculture-forest landscape revealed by nitrogen stable isotopes

Authorea (Authorea) (2021)

Ayaka Hata Rumiko Nakashita Keita Fukasawa Masato Minami Yuko Fukue

Conflicts arising from the consumption of anthropogenic foods by wildlife are increasing worldwide. Conventional tools for evaluating the spatial distribution pattern of large terrestrial mammals that consume anthropogenic foods have various limitations, despite their importance in management to mitigate conflicts. In this study, we examined the spatial distribution pattern of crop-foraging sika deer by performing nitrogen stable isotope analyses of bone collagen. We evaluated whether crop-foraging deer lived closer to agricultural crop fields during the winter and spring, when crop production decreases. We found that female deer in proximity to agricultural crop fields during the winter and spring were more likely to be crop-foraging individuals. Furthermore, the likelihood of crop consumption by females decreased by half as the distance to agricultural crop fields increased to 10 km and fell to essentially zero at a distance of approximately 40 km. We did not detect a significant trend in the spatial distribution of crop-foraging male deer. The findings of spatial distribution patterns of crop-foraging female deer will be useful for the establishment of management areas, such as zonation, for efficient removal of them.

10.22541/au.162688315.55778371/v1

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Author response for "Growth pattern and turnover of carbon and nitrogen measured by stable isotope ratios in the hair of sika deer (<scp>Cervus nippon</scp>)"

Ayaka Hata Anna Inoue Yasuhiro Nakajima Hikaru Uno Tomoko Naganuma

Cervus

Carbon fibers

10.1002/rcm.9920/v2/response1

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Author response for "Growth pattern and turnover of carbon and nitrogen measured by stable isotope ratios in the hair of sika deer (<scp>Cervus nippon</scp>)"

Ayaka Hata Anna Inoue Yasuhiro Nakajima Hikaru Uno Tomoko Naganuma

Cervus

Carbon fibers

10.1002/rcm.9920/v3/response1

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Trends in the veterinary drug market 62 Animal medicine under development and for sale in the world market May 2007

Ayaka Hata

Veterinary Drugs

Drug Development

Veterinary Drugs

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Temporal and spatial variation in the risk of grazing damage to sown grasslands by sika deer (Cervus nippon) in a mountainous area, central Japan

Crop Protection (2019)

Ayaka Hata Hideharu Tsukada Akane Washida Takayuki Mitsunaga Mayura B. Takada

Culling

Fencing

Cervus

Growing season

10.1016/j.cropro.2019.02.002

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Citations (12)

Severe Jackknife-like Kyphosis Malformation in the Fetus of a Free-ranging Sika Deer (Cervus nippon)

Japanese Journal of Zoo and Wildlife Medicine (2020)

Ayaka Hata Yuto Suda Midori Saeki Tatsuki Shimamoto Hisashi Yoshimura

A malformed fetus was found in the uterus of a hunted wild sika deer (Cervus nippon) in Japan. Computed tomography, gross pathological and histopathological examinations revealed multiple congenital deformities, including severe jackknife-like kyphosis, exposure of the abdominal viscera, cleft palate, cleft muzzle, excess dorsiflexion of the digits in the right forelimb, third and lateral ventriculomegaly, aberrant lobulation of the lung, and imperforate anus. No pathogens associated with congenital malformation in ruminants were detected. This case report is the first to describe a severe congenital fetal malformation in a free-ranging sika deer; however, the cause of the malformation remains unknown.

Cervus

Imperforate anus

Ventriculomegaly

10.5686/jjzwm.25.141

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Citations (1)

Agricultural crop consumption induces precocious maturity in deer by improving physical and reproductive performance

Ecosphere (2021)

Ayaka Hata Rumiko Nakashita Tomoko Anezaki Masato Minami Yuko Fukue

Abstract Anthropogenic foods such as agricultural crops have potential to give large impacts on wildlife populations. However, few studies have addressed the impact of anthropogenic food consumption on the individual performance and then population of long‐lived mammals such as large herbivores. In this study, we investigated the effect of agricultural crop consumption on the physical characteristics and reproductive performances of sika deer ( Cervus nippon ) in central Japan. To investigate the relative dietary contribution of agricultural crops for each individual, we performed nitrogen stable isotope analysis of bone collagen. Our results suggest that nitrogen stable isotope ratios (δ 15 N) could be used as an index of the relative dietary contribution of agricultural crops. The δ 15 N value of agricultural crops was much higher than that of wild plants and that of bone collagen varied widely among individuals. Deer ≤4 yr old that were more likely to consume agricultural crops tended to be larger and have a higher reproductive rate. In contrast, body size and reproductive rate did not vary according to the relative dietary contribution of agricultural crops in individuals ≥5 yr old. These results indicate that consumption of anthropogenic foods can induce precocious maturity in younger individuals by improving their physical characteristics and reproductive performance. Agricultural crop consumption is therefore likely to be an important factor in the population dynamics of large herbivores living in agricultural landscapes.

Agricultural land

10.1002/ecs2.3464

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Occurrence patterns of crop‐foraging sika deer distribution in an agriculture–forest landscape revealed by nitrogen stable isotopes

Ecology and Evolution (2021)

Ayaka Hata Rumiko Nakashita Keita Fukasawa Masato Minami Yuko Fukue

Abstract Conflicts arising from the consumption of anthropogenic foods by wildlife are increasing worldwide. Conventional tools for evaluating the spatial distribution pattern of large terrestrial mammals that consume anthropogenic foods have various limitations, despite their importance in management to mitigate conflicts. In this study, we examined the spatial distribution pattern of crop‐foraging sika deer by performing nitrogen stable isotope analyses of bone collagen. We evaluated whether crop‐foraging deer lived closer to agricultural crop fields during the winter and spring, when crop production decreases. We found that female deer in proximity to agricultural crop fields during the winter and spring were more likely to be crop‐foraging individuals. Furthermore, the likelihood of crop consumption by females decreased by half as the distance to agricultural crop fields increased to 5–10 km. We did not detect a significant trend in the spatial distribution of crop‐foraging male deer. The findings of spatial distribution patterns of crop‐foraging female deer will be useful for the establishment of management areas, such as zonation, for efficient removal of them.

10.1002/ece3.8216

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Citations (4)

Silver-spoon effect in agricultural crop consumers: Relationship between crop consumption and body growth in sika deer

Authorea (Authorea) (2024)

Ayaka Hata Midori Saeki Chinatsu Kozakai Rumiko Nakashita Keita Fukasawa

Consumption

10.22541/au.173168126.68161544/v1

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