期刊
PAKISTAN JOURNAL OF ZOOLOGY
卷 53, 期 5, 页码 1973-1976出版社
ZOOLOGICAL SOC PAKISTAN
DOI: 10.17582/journal.pjz/20200802060800
关键词
Luminance; Illuminance; Luminous intensity; Luminous flux; Secondary cavity nesting birds; Non-cavity nesting birds
类别
资金
- National Natural Science Foundation of China [31770419]
- Science and Technology Research Project of the Education Department of Jilin Province [JJKH20190281KJ]
- Open Project Program of Jilin Provincial Key Laboratory of Animal Resource Conservation and Utilization [1300289105]
The majority of avian species are diurnal and adapt to variations in light intensities associated with daily, seasonal, or lunar cycles. A study comparing light intensity thresholds of activity in secondary cavity and non-cavity nesting passerines found that the former have lower activity thresholds than the latter. This sheds light on the potential impact of luminance on the visual performance of these two groups of birds.
The great majority of avian species is diurnal and thus endures variation in light intensities, associated with daily, seasonal or lunar cycles. These diurnal birds search their food in light abundant environment and raise their broods in dark cavities. However their visual performance in dim light conditions is largely unknown. Here, we compared light intensity threshold of activity in two groups of passerines, i.e. secondary cavity and non-cavity nesting. For this purpose, different species of secondary cavity and non-cavity nesting passerines were subjected to two phases of trials: in the first trial birds were released in an experimental cage and allowed them to accommodate themselves in darkness for 10 min. In the second trial we turned on the dimmer to a given luminance for 2 min. We found that activity threshold for secondary cavity nesting passerines ranged from 0.05 to 0.2 cdm(-2) and non-cavity nesting passerines from 22.00 to 16.00 cdm(-2). Our results shed light on the question about potential effect of luminance on visual performance by secondary cavity and non-cavity nesting passerines.
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