Horai-numa (mature adults)
Basic information
Sample name: Horai-numa (mature adults)

Reference: H. Ubukata. 1974. Relative abundance and phenology of adult dragonflies at a dystrophic pond in Usubetsu, near Sapporo. Journal of the Faculty of Science Hokkaido University Series VI, Zoology 19(3):758-776 [ER 1079]
Country: Japan

Coordinate: 42° 47' N, 140° 49' E
Basis of coordinate: based on nearby landmark
Geography comments: "at the foot of Mt. Muine" (coordinate based on Abuta District)
altitude is based on "Usubetsu... 1 km apart"
Habitat: lake
Substrate: water edge
Habitat comments: "a mountainous dystrophic pond... surrounded by bog mats covered mainly with Phragmitis and Sphagnum and a deciduous broad-leaf forest with admixture of afforested conifers"
Life forms: odonates
Sampling methods: no design, visual
Sample size: 2147
Years: 1971
Seasons: spring, summer, autumn
Sampling comments: "Walking slowly around the pond (ca. 15~30 min. for a turn around the shore), every mature individual was counted and recorded"
Sample: 1592
Contributor: John Alroy
Enterer: John Alroy
Created: 2015-05-24 09:10:44
Modified: 2016-10-21 15:42:02
Abundance distribution
11 species
2 singletons
total count 2147
extrapolated richness: 13.3
Fisher's α: 1.516
geometric series k: 0.5181
Hurlbert's PIE: 0.7546
Shannon's H: 1.6123
Good's u: 0.9991
Each square represents a species. Square sizes are proportional to counts.