Reproductive characteristics of Japanese monkeys on Shimokita Peninsula, Japan, the northernmost habitat of wild primates in the world
| Autor: | Shin-ichi Hayama, Setsuko Nakanishi, Aoi Ochi, Yoshi Kawamoto, Yuki Kawabata, Hideharu Yamazaki |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Primates
Zoology Climate change Wildlife Science Biology Macaca fuscata Japan Pregnancy Peninsula Animals Ecosystem Japanese monkeys geography geography.geographical_feature_category Full Paper General Veterinary Macaca nemestrina Global warming Japanese monkey conception date Pregnancy rate climate change Habitat Birth date Macaca Female pregnancy rate |
| Zdroj: | The Journal of Veterinary Medical Science |
| ISSN: | 1347-7439 0916-7250 |
| DOI: | 10.1292/jvms.21-0141 |
| Popis: | The Shimokita Peninsula in Aomori Prefecture, Japan, which is inhabited by Japanese monkeys (Macaca fuscata), is the northernmost habitat for wild primates in the world. This study was the first to determine the conception dates of specific individuals and estimate the pregnancy rate of wild populations in this region. The pregnancy rate of animals aged 5 years or more at delivery was estimated to be 40.9% (27/66). Conception dates of each fetus were also estimated using a regression line of Pig-tail monkeys (Macaca nemestrina), which are taxonomically related to Japanese monkeys and have a similar physique. The conception dates were distributed across 90 days between September 24th and December 23rd, with a mean conception date of November 4th (SD=22.3 days, n=53). Using these findings, the mean birth date was estimated as April 25th, more than two weeks earlier than the mean birth date in previous research determined using direct observations carried out over the past 20 years ago. Global warming due to climate change is thought to be one of the main causes of this difference. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|