Harvesting and caching capacities of thin-billed Nutcrackers in the Russian Far East

Autor(en): Bergmann, HH
Englander, W
Arkhipov, VU
Stichwörter: food storing; Ornithology; Russian Far East; seed caching; STARLINGS STURNUS-VULGARIS; time budget; Zoology
Erscheinungsdatum: 2001
Volumen: 142
Ausgabe: 2
Startseite: 129
Seitenende: 143
At the Ochotskian sea coast Thin-billed Eurasian Nutcrackers (Nucifraga caryocatactes macrorhynchos) harvested seeds of ripe cones of the brush pine Pinus pumila in late summer. The mean number of seeds carried in their sublingual pouch was 80, which respresents the harvestable contents of 2.8 cones. These were distributed in an average of 5 caches, exclusively in the soil under low tundra vegetation. Caches were organized in nearly straight lines. Series contained a mean of 82.7 seeds, single caches a mean of 19.6 seeds. Plucking one cone and harvesting its seeds took 47 seconds on average. The caching of a complete pouchful took on average 123.4 seconds. The time invested for harvesting and caching one single seed was calculated at 3.26 seconds. Within three weeks in July, an average individual bird was calculated to have cached a total of up to 100,000 seeds.
ISSN: 00218375
DOI: 10.1007/BF01651782

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