| Titre : | Lunar influence on diurnal bird activities in a riverine landscape (Perach reservoir, Southern Bavaria). |
| Auteurs : | Hans Utschick, Auteur |
| Type de document : | Article |
| Dans : | Ornithologischer Anzeiger (42(1) Januar 2003) |
| Article en page(s) : | 17-40 |
| Résumé : | Allyear line-transect counts of the Perach reservoir bird community (Inn river with surrounding floodbeds and natural forests) were compared to lunar periodicity. Bird activities peaked during increasing half-moon, full moon and the five days before new moon, showing low activities during new moon and two days before and after full moon (medians). This may be not due to a lunar light sensitivity only, because bird activities during cloudy weather were higher than on sunny days at periods before and after full moon. In wet, open habitats bird activities and group sizes peaked just before full and new moon, in dark, closed forest habitats during new moon and later. Typical new moon guilds are short-staying starlings and corvids (big groups mainly in autumn and winter), pipits and wrens migrating along river lines, in spring rare migrating birds preferring open meadows, Great and Green Woodpecker, River and Grasshopper Warbler and air insect feeders. In full moon canopy feeders like Oriole or Long-tailed Tit, river-side birds like reed warblers, Willow Warbler (willow-thickets) or Short-toed Treecreeper (old willow trees), sylviid warblers (understory), Meadow Lark and rare forest migrants demonstrated highest activities. New and full moon reactions showed mainly herbivorous bird guilds like autumn and winter flocks of Wood Pigeon, Fieldfare, Jay and finches, also Buzzard, and, in the cold season only, common tits of broadleaved forests and ubiquitous species like the Chaffinch. The changing activity patterns of the riverine bird community following lunar periodicity may be caused by locally and regionally changing resource patterns (air, canopy, understory, floor; nutriability of plants) between agricultural and riverine habitats and landscapes or by endogenous stimulus (starting/inhibiting migration or song activities). |
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