East Twin Pond (exuviae)
Basic information
Sample name: East Twin Pond (exuviae)

Reference: E. J. Kormondy and J. L. Gower. 1965. Life history variations in an association of Odonata. Ecology 46(6):882-886 [ER 1077]
Country: United States
State: Pennsylvania

Coordinate: 41° 39' N, 80° 25' W
Basis of coordinate: based on nearby landmark
Geography comments: "five miles south of Linesville" (basis of coordinate)
Climate and habitat
Habitat: lake
Protection: unprotected
Substrate: open water
Habitat comments: the pond "arose about 50 years ago from the bisecting of a 0.7-acre impoundment by a roadway" and has "a maximum depth of 1.0 m and a surface area of 0.3 acres"
Life forms: odonates
Sampling methods: no design, sieves
Sample size: 1200
Years: 1961, 1962
Sampling comments: "Emerging individuals were sampled using screen wire cages, 12 of which were constructed by attaching 26-mesh plastic screening to a wooden frame enclosing a basal area of 1 ft2 with a height of 1.5 ft. These cages were distributed over representative habitats of the open water of the pond... Eight cages of similar construction except that they enclosed a basal area of 2 ft2 were placed at random around the edge of the pond"
Sample: 1590
Contributor: John Alroy
Enterer: John Alroy
Created: 2015-05-23 19:27:39
Modified: 2020-01-14 20:45:27
Abundance distribution
12 species
4 singletons
total count 1200
extrapolated richness: 18.7
Fisher's α: 1.853
geometric series k: 0.5643
Hurlbert's PIE: 0.6851
Shannon's H: 1.3599
Good's u: 0.9967
Each square represents a species. Square sizes are proportional to counts.