O heterotrofnoj ishrani nekih vrsta zelenih alga

The growth of eight species of green algae on sixteen organic substrates in the light as well as in the dark was tested quantitatively. The growth was stimulated by most organic substrates and we can correlate it with heterotrophic nutrition. The heterotrophic growth was stimulated in the light. The best ability of heterotrophic growth has been shown in two species: Scenedesmus quadricauda and Chlorella sp., and the poorest in Ulothrix sp. Glucose, fructose, peptone and yeast extract were the most efficient growth substrates and the least efficient were ribose and urea. Enlarged and giant cells of unicellular species were usually present during their heterotrophic growth. These changes are considered to be the consequence of the disharmony between the process of cell growth and cell division.Kvantitativno je ispitivano rastenje osam vrsta zelenih alga na šesnaest organskih supstrata, kako na svjetlosti tako i u tami. Mnogi organski supstrati stimulirali su rast, pa to možemo povezati sa heterotrofnom prehranom. Svjetlost je stimulirala heterotrofni rast. Najpogodniji supstrati za heterotrofiju bili su: glukoza, fruktoza, pepton i ekstrakt kvasca, a inhibiciju rastenja kod većine vrsta izazvali su riboza i urea. Najbolji heterotrofni rast pokazale su vrste Scenedesmus quadricarida i Chlorella sp., a najslabiji nitasta alga Ulothrix sp. Kod jednostaničnih vrsta bile su često prisutne povećane i divovske stanice. Te promjene protumačene su kao poremećaj ravnoteže između procesa rastenja i dijeljenja stanica

Istraživanja fitoplanktonskih zajednica južnog Jadrana u široj okolici Dubrovnika

In four ecologically different habitats (at 9 stations) in the southern Adriatic, four phytoplankton associations, which could be united in two alliances and one order, have been determined. The criterion for determining associations and other communities (alliances and order) was the fidelity of species towards the principles of the Zürich-Montpellier phytocoenologic school. The largest number of the characteristic species of the communities described belongs to the group of Dinophyta, even though they are less abundant than Bacillariophyceae. The characteristic species of Haptophyceae are important only in the open sea community. Acording to the assumption made in this work about some groups of phytoplankton species showing ecological distribution, the associations described can be used as ecological indicators. Because of the complex three-dimensional nature of the marine ecosystem (i. e, horizontal, vertical and time dynamics), the results should be checked in forthcoming investigations.U četiri ekološki različita staništa (na 9 postaja) u južnom Jadranu utvrđene su četiri asocijacije fitoplanktona koje se mogu ujediniti u dvije sveze i jedan red. Kao kriterij za određivanje asocijacija i ostalih zajednica poslužila je vezanost vrsta po principima fitocenološke škole Ziirich- Montpellier. Najveći broj karakterističnih vrsta opisanih zajednica pripada skupini Dinophyta, iako su one kvantitativno slabije zastupljene nego Bacillariophyceae. Haptophyceae su sa 2 karakteristične vrste važne jedino u zajednici otvorenog mora. Prihvaćajući pretpostavku da određene skupine vrsta fitoplanktona pokazuju ekološku raspodjelu, utvrđene asocijacije mogu poslužiti kao ekološki indikatori. Zbog složene trodimenzionalne prirode morskog ekosistema (horizontalna, vertikalna i vremenska dinamika) pokazane rezultate je potrebno provjeriti na budućim istraživanjima

Acta Botanica Croatica: editorial activity and scientometric analysis for the period 1998–2014

An editorial report concerning and scientometric analysis of papers published in the journal Acta botanica croatica for the period from 1998 to 2014 is presented. Since 1998, original scientific papers have been written exclusively in English and the accessibility and communicability have increased. The journal is included in the citation base SCOPUS (since 2007) and Web of Science – Science Citation Index Expanded (since 2008). Beginning in 2011, a partnership with co-publishers Versita – Central European Science Publisher and Walter de Gruyter Open Publishing House, resulted in improved management, quality control, electronic publication and increasing visibility of the journal. The impact factor has been calculated since 2010 by Journal Citation Reports and has increased from 0.435 to 0.839

Taksonomija i rasprostranjenost fitoplanktona u otvorenom moru južnog Jadrana

This account of the taxonomic composition of phytoplankton (mainly microphytoplankton) in the offshore south-eastern Adriatic is a contribution to a check-list of Adriatic phytoplankton, which has not been prepared to date. The investigated area is influenced by warm, highly saline and extremely oligotrophic waters of the north-westerly, inflowing current from the eastern Mediterranean (Ionian Sea). Samples were collected by Niskin samplers and plankton net in the 0¿100 m layer, in April, June and September 1993, and in February 1994. Seven additional cruises in 1979/80 and six cruises in the period from 1981 to 1990 gave data on rare taxa found in net samples only. Two hundred twenty nine taxa have been determined by light microscopy (2 chrysophytes, 12 prymnesiophytes, 95 diatoms, 119 dinoflagellates and 1 prasinophyte).Taksonomski sastav fitoplanktona (uglavnom mikrofitoplanktona) u otvorenom moru jugoistočnog dijela Jadrana, prilog je za izradu popisa Jadranskog fitoplanktona, koji do danas nije sastavljen. Istraživano područje se nalazi pod utjecajem tople, slane i ekstremno oligotrofne vode koju donosi sjeveroistočna ulazna struja iz istočnog Mediterana (Jonskog mora). Uzorci su sakupljeni Niskinovim crpcem i planktonskom mrežom u sloju od površine do 100 m dubine, u travnju, lipnju, rujnu 1993, te studenom 1994. godine. Također su dodani podaci o rijetkim vrstama, dobiveni analizom mrežnih uzoraka sa sedam krstarenja u 1979/80 i šest krstarenja u razdoblju od 1981 do 1990. godine. Svjetlosnim mikroskopom je određeno 229 svojti (2 krizoficeje, 12 primnezioficeja (kokolitoforida), 95 dijatomeja, 119 dinoflagelata i 1 prasinoficeja)

Biological diversity in urban planning

U velikim gradovima raste potreba za suvremenim urbanim planiranjem. Urbano planiranje uključuje krajobrazno oblikovanje, krajobraznu ekologiju i inovativna rješenja. „Zelena tehnologija“ i veća biološka raznolikost čini „zeleni servis“ grada koji omogućava zdraviji i jeftiniji život građana. Ekološko uređivanje javnih površina i privatnih vrtova treba biti u skladu s globalnim projektom o urbanoj biološkoj raznolikosti kojem je primjerice grad Zagreb pristupio još 2007. godine. Osnovni cilj tog projekta sastoji se u osmišljavanju koridora kojim se povezuju javne površine i privatni vrtovi u središtu grada s prirodnim okolišem u njegovoj okolici.Large cities provide increasing need for modern urban planning. Urban planning involves landscape design, landscape ecology and innovative solutions. “Green technology” and greater biological diversity make “green service” allowing cheaper and healthier citizen’s life. Ecological management of public areas and private gardens should be in line with the global project on urban biodiversity which, for example, the city of Zagreb joined in 2007. The main goal of this project consists in creating corridors that connects public spaces and private gardens in the city center with the natural environment around the city