Original scientific paper

Investigation on Aeroplankton at Crikvenica

Iva Volarić-Mršić ; Hrvatska

Abstract

Research on aeroplankton in the area of Crikvenica was done in 1968 and the results from the teritory cover the period between April 25 and July 24. The stadard Durham method was used for exposing test slides to the air for 24 hours. Pollen was counted on 324 sq. mm. of slide surface and exposure was done daily.
In the research period in the air of Crikvenica the pollen of various trees and bushes was abundantly represented while grasses and other herbs or weeds were represented in a considerably smaller quantity, and the amount of pollen collected from the air in that period was much bigger than the amount of spores (table 1). On 84 exposed slides the total of 4656 pollen and 478 spores was counted.
Table 2 shows daily circulation of pollen and spores during the testing period. A very high pollen curve at the end of April was the result of the blossoming period of some species of anemophylous trees (Quercus, Broussonetia, Fraxinus). During May the pollen content in the air of Crikvenica was rather high, in June it was reduced and in the second half of July quite negligible. In comparison with pollen the daily curve of spores for the whole period is rather low except for a peak at the beginning of June and one at the beginning of July, which can be seen from the graph in Table 2.
Table 3 shows the appearance of the pollen of some more prominent variaties, i.e. groups of plants in the air of Crikvenica in the research period. Quercus, Ostrya and Carpinus and Broussonetia were present in the air of Crikvenica at the end of April and mostly again in May. Pina- ceae, Cupressaceae, Oleaceae, then Urticaceae, Chenopodiaceae and Plan- tago were present in the air more or less in the whole research period and so were Gramineae.
Botanical composition of pollen in the air of Crikvenica can also be seen from the pollen spectrum graph (Table 4). This composition is the representative of the vegetation of the nearby country. Together with rich and various self grown vegetation of a submediterranean character in the planted areas there are various exotic plants. The air currents also influence the pollen composition in the air of Crikvenica, which is confirmed by the presence of the pollen of some mountain plants, e. g. Fagus, Picea and other as well as the plants from the nearby island of Krk.
During the testing period spores of Alternaría and Cladosporium more often were found on the exposed test slides, and in a small numbers were ocassionally observed Ustilago and Tiletia, some Uredinales, then Helminthosporium and others.
The wooded area around Crikvenica stretching from the seashore up to about 400 m above the sea belongs to the submediterranean deciduous vegetation as. Carpinetum orientalis croaticum H-ić 1939. and above 400 m. there is also a xerophilous woods of submediterranean character, as. Seslerio-Ostryetum Ht. et H-ić 1950.

Keywords

Hrčak ID:

157140

URI

https://hrcak.srce.hr/157140

Publication date:

31.12.1972.

Article data in other languages: croatian

Visits: 1.303 *