Relatives

The distribution area of Pyrus communis .

Object description Download GIS-layers

Authors:

Expert botanist I.G. Chuhina
GIS-expert O.V. Pereloma

Date of creation:

29.11.2004

Scale:

1:20,000,000

Accuracy of map:

Map was created using herbarium specimens and a map of scale 1:25,000,000.

The projection:

"Alber's Equal Area Conic for Russia", 9, 1001, 7, 100, 0, 44, 68, 0, 0.

Basic contents:

Vector map. Area of species distribution is shown by polygons, while actual location occurrence is shown by points.

Accuracy of classifier:

Point data were obtained from published sources and herbarium specimens. Polygons are based on published sources, herbarium samples, and field surveys by the authors.

Method of map production:

Published literature was reviewed, including atlases, monographs and papers. Occurrence data were obtained from herbarium specimens, floras, monographs and papers. The data on distribution of the species were obtained from the VIR database (N.I. Vavilov Institute, 1999) and the published map of Sokolov et al (1980). The eastern, southwestern and northwestern borders of the distribution area were constructed in accordance with information from herbarium specimens of the National Moscow University and the N.I. Vavilov Institute. Other borders of the distribution area were drawn in accordance with Sokolov et al. (1980). In Middle Asia, this species is cultivated and runs wild; therefore, the distribution area within Middle Asia is presented by points only. These points match verified locations of wild-growing plants of this species. These locations have been confirmed by herbarium specimens of the N.I. Vavilov Institute (1999). Data were then compiled through scanning and geo-referencing to develop a composite vector map. The biologist, together with the GIS-specialist, drew a new plant distribution area based on compiled data.

Reference citations:

N.I. Vavilov All-Russian Institute of Plant Industry [WIR], St. Petersburg, Russia.
National Moscow University [MWG], Moscow, Russia.
N.I. Vavilov Institute, Herbarium Department, 1992. Information retrieval system: Wild-growing relatives of cultural plants of Russia. STC Informregistr 0229905883, St. Petersburg, Russia.
Sokolov S.I., Svjaseva O.A., Kubli V.A. 1980. Areas of distribution of trees and shrubs in the USSR. Vol. 2. Leningrad: Nauka. Map #49.

Right and copyright:

Copyright on this map and its description belongs to its authors.
Copyright on the picture belongs to S. Shuvalov.