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The clutch size,incubation behavior of Reeves’s Pheasant(Syrmaticus reevesii) and their responses to ambient temperature and precipitation

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Avian Research 2024年第1期15卷 72-80页

作者： Ting Jin Shuai Lu Yunqi Wang Junqin Hua Zhengxiao Liu Qian Hu Yating Liu Yuze Zhao Jianqiang Li Jiliang Xu School of Ecology and Nature Conservation Beijing Forestry UniversityBeijing100083China State Key Laboratory of Efficient Production of Forest Resources Beijing Forestry UniversityBeijing100083China

Weather conditions play a pivotal role in embryo development and parental incubation costs,potentially impacting the clutch size and incubation behavior of *** these effects is crucial for bird ***’ s Pheasant(Syrmaticus reevesii) is a threatened species endemic to China,which is characterized by female-only ***,there is a lack of information regarding the impact of weather conditions on clutch size and incubation behavior in this *** satellite tracking,we tracked 27 wild female Reeves’ s Pheasants from 2020 to 2023 in Hubei Province,*** explored their clutch size and incubation behavior,as well as their responses to ambient temperature and *** size averaged 7.75 ±1.36,had an association with average ambient temperature and average daily precipitation during the egglaying period,and was potentially linked to female breeding *** the incubation period,females took an average of 0.73 ±0.46 recesses every 24 h,with an average recess duration of 100.80 ±73.37 min and an average nest attendance of 92.98 ±5.27%.They showed a unimodal recess pattern in which nest departures peaked primarily between 13:00 and 16:***,females rarely left nests when daily precipitation was *** duration and nest attendance were influenced by the interaction between daily mean ambient temperature and daily precipitation,as well as day of ***,there was a positive correlation between clutch size and recess *** results contribute valuable insights into the lifehistory features of this endangered species.

关键词： Ambient temperature Clutch size incubation behavior Precipitation Reeves’s Pheasant

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Do brood parasitic Common Cuckoos develop brood patches during the breeding season?

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AVIAN RESEARCH 2024年第3期15卷 363-368页

作者： Go, Jun-Seo Kim, Hae-Ni Jin, Sue-Jeong Cha, Myeong-Chan Lee, Heesoo Lee, Jin-Won Kyung Hee Univ Korea Inst Ornithol Seoul 02447 South Korea Kyung Hee Univ Dept Biol Seoul 02447 South Korea Bird Res SaeZiP Yangpyeong 12504 South Korea

Many birds develop brood patches on their ventral apterium under hormonal regulation to effectively transmit body heat to eggs during incubation. The developed patch has several characteristics, including de-feathering, vascularization, and edema. However, little is known about whether avian brood parasites that do not incubate their eggs exhibit brood patch development during the breeding season. In this study, we measured the size of the ventral apterium in 114 Common Cuckoos (Cuculus canorus) captured in the field throughout the breeding season and examined the appearance of the ventral apterium to confirm the development of brood patches. We also examined whether morphological traits and various factors correlated with the size of the ventral apterium (sternal apterium and abdominal apterium) and how it changed during the breeding season. We found no clear signs of brood patch development in Common Cuckoos captured throughout the breeding season, indicating that they likely did not develop brood patches on the ventral apterium during this period. We also found that ventral apterium size was positively correlated with wing length and body weight. In addition, Common Cuckoos with newly growing feathers on the boundary of the ventral apterium with pteryla were frequently observed as seasons progressed to the end. In conclusion, Common Cuckoos exhibit neither brood patch development nor the vestigial characteristics of ancestral brood patches, except for the growth of feathers on boundary the ventral apterium. Further studies examining brood patches across different groups of avian brood parasites are valuable for enhancing our understanding of the developmental and physiological adaptations of avian brood parasites.

关键词： Brood parasitism Brood patch Common Cuckoo Pterylosis Re-feathering Ventral apterium incubation behavior AMERICAN KESTRELS BIRDS TEMPERATURE EVOLUTION MORPHOLOGY PROLACTIN SKIN

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