Hidrológiai Közlöny 1949 (29. évfolyam)

7-8. szám - Kivonatok

uopsis oircularis var. javaniea, bis au deii eigentlichen Anabaenopsis mit kurzerem Faden. 5. Ein typisch „warmer-stenotherm" Organismus. Wahrend der kurzen, jáhrlich sich regelrecht wiederholeuden, auif 2—3 Monate sich ausdehnenden Vegetationsperiode, unter Umsuánden mit giinstiger Temperatur (20 C°), ist sie zu einer ausergewöhnlithe Vermehrung faliig, und zeigt ein homogenes Schwiirmen und ein Wasserblühen. Ihre grosse Vermehrung kann fiir die Tierwelt des Teiohes, besonders fiir das Leben der Fische gefáhrlich sein. Contribution to the knowledge of Algae found in the River Danube at Budapest. By G. Tamás, D. Sc. (Hungárián test with figs. on p. 206.) U. D. C. 582.24/26 : 581.9. (282.243.7 : 439.151) Research started in 1946 deals with a'gae living in the plankton, litoral benthos, the perifiton of the moorings and boats of the Danube at Budapest. From the poor river plankton 55, from the benthos 101, from the warm waiíers of the river bank 19, from the perifiton 12 species of algae were determined. The number of species preferring polluted waier was 9. 34 species of algae are identical with plankton algae of the Volga, from organisins of the benthos 5, from 'the perifiton 8 species are the same. 48 plankton algae and 67 beutthos algae are in common with those of the Soroksár Danube arm. The vegetation of Volvocales and Flagellata of Fehértó near Szeged. By M. Szabados, D. Sc. (Hungárián test wii'Uh fiers. and taJKe 011 p. 212.) U. 1). C. 582.25/26 (439.181 Fehértó) 1. The reult of my colkktions hiitherto made is shown in Table I. Accordingly 36 species, 6 varié.ies, 3 nova varieties, and 2 forms were identified in Fehértó. Of these a re new for the Great Plain of Hungary: 2 species: Euglena Grisolii, Traehelomonas abrupta. 2. varieties: Lepocinclis texta var. pachyderma, Tracheloiitonas hirta var. duplex. 3 nova varieties: Euglena fusoa nov. var. minima, Euglena proxima nov. var. minima, Phacus pyi'iun nov. var. Győrffy—Szabados. 2. Somé Flagellata species whioh elsewhere présén ted a stiff periplast (Euglena acus, Phacus torta, Phacus pyrum), showed a eertain degree of metaboly. The decrease of this »:iff character of the periplast may be in connection with the high-graded hydrogen-ion concentration of the water. The chemical composition of the water exerted sucli a great influence on the protein like matériái of the periplast thait it brought about sueh modification. 3. Rather common were ,-apoohloroíic" individuals (Euglena acus), produoedby the abundant fishfood (oatmeal etc.) in the water of the wintering basins. As a raw-culture, it provided abundant food for the planktons iiving in it, wherein the quantity of paraniyluui increased to a great extent. This may exp'ain the phenomenon thai Euglena oyuris had, instead of 2 paramylums so characteristic for this species, a ring of 4 fully developed paramylums. 4. The shell of the Traohelomonas was usually colourless or light-brown. but nevei- darkbrown, which shows that the water contained but a minimum quantity of Fe for the cells to build the shell (See tablie by J. Straub 1936). 5. Remarkable was the manifold appearance of the chromatophoron of Euglena gramulata together with 'the lively Eutreptia-like metaboly of this species. 6. A large number of individuals were found aniong the Euglenae gran. wicli had been infeeted by a Chytridium-like water-fungus, Ihe Rhizidium Euglenae Alex. Braun. The swarmers. which were swarming in the round or oblong bladder, pressed so long against the periplast of the Euglena cells, till it gave way to the pressure and burst, when the swarmers presently dispersed in the water. 7. It is remarkable that most of the species were eonsiderably undersized as compared with foreign species. It was therefore necessary to establish somé new varieties (Euglena fusca nov. var. minima, Euglena proxima nov. var. minima). Domestic occurrence and Biosociologv of Euglena Ehrenbergii Klebs and of n. f. minor Hortob. By T. Hortobágyi, D. Sc. (Hungárián itest with figis. and taítale on p. 220.) U. n. C. 582.251.72 : 581.5 Having ohecked data on Euglena Ehrenbergii Klebs Flagellata of Hungary and by his own researoh the author has found that in this country, besides the typical E. Ehrenbergii Klebs. the specification and description of it new form by far smaller in size, of the 11. f. minor Hortob, is necessary. Description of the new-form: cells are rounded off 011 bo'.h ends are ofband form with lively metabolic motion. Their periplast is finely, sometimes hardly visibly (treated with Eau de Javelle) spiral-streaked. Cramatophorae of many of them are of diak form; paramylon eycs are alsó of disk, but may be of cylindrical bar form as well. The flagellum has the double length of the body. Cell length: 90—176 t* width .10—27 P The specimens have lengths 6—8 times their width. The stigma is large, sometimes branching off üke fingers. Differs from the typical form only in size. In Hungary it has hitherto been found all the year round, but in somé biotopes it has not occured yet eyery month. Its maximum propagation is in summer. It prefers more polluted waters but alsó occurs in purer water like the seston of Laké Balaton. Research has hitherto found that quanti'tatively it belongs to organi&nis of minor importanee in Hungary. The Euglena Ehrenbergii Klebs is known with certainty in Hungary in the environs of Szeged and in the Inner Laké oT Tihany. The main form is thus of minor importanee relative ío the new variety. .253