The zoogeography of gall midges (Diptera: Cecidomyiidae) of the Czech Republic. :
| Autor: | Skuhravá, Marcela, 1934- |
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| Jazyk: | angličtina |
| Předmět: |
zoogeografie
dvoukřídlí bejlomorkovití zoogeography Diptera gall midges články journal articles faunistika horizontální a vertikální výskyt frekvenční skupina dlouhodobé změny population dynamics ohrožené druhy vyhynulé druhy zranitelné druhy faunistics Cecidomyiidae horizontal and vertical occurrence frequency group long-term changes dynamika populace threatened species exctinct species endangered species vulnerable species |
| Druh dokumentu: | Non-fiction |
| ISSN: | 1211-376X |
| Abstrakt: | Abstract: Fauna of the family Cecidomyiidae, including 500 species, is evaluated from the zoogeographical point of view based on data about occurrence gathered by earlier authors and on data obtained during systematic faunistic investigations at 670 localities throughout the territory of the Czech Republic. One to 77 species have been recorded at individual localities. On average, 26 species have been found per locality. Average number of species falls with increasing elevation. Based on horizontal occurrence, all species are divided into six frequency groups by using the first six members of the geometrical progression with quotient 2 and coefficient a, accompanied with verbal denomination: I. species, occurring solitarily, II. scarcely, III. moderately, IV. considerably, V. abundantly, VI. commonly. Based on vertical occurrence, thirteen types of similar vertical occurrence schemes are recognized. About 210 species belong to planare, 460 to colline, 290 to submountain, 122 to mountain, and 26 to sub-Alpine species (sensu lato). Based on analysis of long-term changes in population dynamics, gall midges are divided into six groups, viz. species with increasing, stable and decreasing population density, disappearing species and disappeared species and species insufficiently known. 64 species (12%) are threatened species of which 32 (7%) are extinct, 16 (3%) are endangered and 16 (3%) are vulnerable species. The horizontal and vertical occurrence of 230 gall midge species is demonstrated in maps and graphs. |
| Databáze: | Katalog Knihovny AV ČR |
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