Variability in roost size in an Amazona parrot: implications for roost monitoring
| العنوان: | Variability in roost size in an Amazona parrot: implications for roost monitoring |
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| المؤلفون: | Stuart J. Marsden, Stacey Cougill |
| المصدر: | Journal of Field Ornithology. 75:67-73 |
| بيانات النشر: | Association of Field Ornithologists, 2004. |
| سنة النشر: | 2004 |
| مصطلحات موضوعية: | Evening, biology, Ecology, Significant difference, Bird colony, Zoology, biology.organism_classification, Geography, Weather data, Amazona brasiliensis, Seasonal breeder, Atlantic forest, Ecology, Evolution, Behavior and Systematics, Morning |
| الوصف: | Roost counts may be a useful method for assessing and monitoring parrot populations as long as counting regimes can detect real differences in abundance above the noise of daily variability in roost size. We studied a roost of up to 85 Red-tailed Amazons (Amazona brasiliensis) for 28 consecutive mornings and evenings from 12 July to 7 August 2001, and recorded bird behavior and associated weather data. The roost declined significantly over the survey period as the breeding season drew nearer. There was no significant difference between evening and morning roost counts, but we suggest that as long as misty mornings are avoided, morning roost counts were more effective as birds left more quickly and predictably. It took longer for birds to arrive on evenings when the roost was large, but birds left quicker in the morning when there were large numbers in the roost. Weather influenced both roost size and timing of arrival, with larger than expected numbers in the roost, and birds arriving later in th... |
| تدمد: | 1557-9263 0273-8570 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_________::d433347e123368142267e2de46d2188aTest https://doi.org/10.1648/0273-8570-75.1.67Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi...........d433347e123368142267e2de46d2188a |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 15579263 02738570 |
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