スイスのアカヤマアリ類(Formica亜属)
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概要
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In 1978, the census of red wood ants Formica s. str. was made in Switzerland. The main results are : 1. Four species were discovered. F. pratensis which preferred open habitats such as grasslands and roadsides was distributed from 460 to 1,360 m above the sea, mostly at 800 m or less. F. rufa was distributed from 490 to 1,200 m, inhabiting forest margin in the lowland but grassland in the highland. F. polyctena preferring forest and its margin was distributed from 480 to 1,250 m. F. lugubris which was the most dominant in any area occupied any altitude below the timberline (ca. 2,000 m), mostly inhabiting forest and its margin. 2. The daily flight activity in nuptial season was well synchronized in open habitats. Therefore, the synchronism developed well in F. pratensis and F. rufa. 3. Each nest of F. rufa, F. polyctena and F. lugubris had a huge mound, mean size of which was ca. 110 cm in diameter and ca. 50 cm in height. However, the mounds of F. pratensis were small (mean diameter 55 cm) and flat (mean height 18 cm), probably due to less materials of nests or due to being exposed to wind in the open habitats. 4. The mounds of any species faced east to southwest, i. e. the direction of sun. 5. The colony of F. pratensis was always monodomous, but F. lugubris frequently made oligoand polydomous colonies. F. rufa and F. polyctena were mostly monobut occasionally oligodomous. 6. The polydomous colony of F. lugubris had characteristics quite different from that of F. yessensis in Ishikari Coast.
- 北海道大学の論文
- 1982-10-25
著者
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