Analele ŞtiinĠifice ale UniversităĠii „Al. I. Cuza” Iaşi s. II a. Biologie vegetală, 2014, 60, 1: 69-77 http://www.bio.uaic.ro/publicatii/anale_vegetala/anale_veg_index.html ISSN: 1223-6578, E-ISSN: 2247-2711 ALGOFLORA FROM THE MILETIN AND JIJIA INFERIOR CATCHMENTS II. PHYLUMS CHLOROPHYTA, HETEROKONTOPHYTA, CHOANOZOA AND CRYPTOPHYTA Carmen AONCIOAIE 1 *, Mihai-Georgel ERHAN 1 , Diana COSTIN (GHEğEU) 2 , Gabriela Iuliana BREABĂN 3 Abstract: The paper presents a continuation of the detailed analysis of the algal flora from the Miletin and Jijia Rivers inferior catchments located in the proximity of Iaşi city and of a series of reservoirs complexes created on the course of the two rivers (Hălceni, Vlădeni and Larga Jijia) particularly used for intensive aquaculture. The main use of the reservoirs is as fisheries where it is practiced the artificial fertilization (especially Vlădeni and Larga Jijia) with organic and inorganic matter (manure, ammonium nitrate and super-phosphate) in order to boost the primary link in the food chain – the phytoplankton and the periphyton. This paper focuses on another series of algal groups represented by Chlorophyta, Heterokontophyta, Choanozoa and Cryptophyta. The hypereutrophy of the water in the reservoirs and rivers is reflected in the numerous species and in their densities that lead to extensive algal blooms. Keywords: Chlorophyta, Heterokontophyta, Choanozoa, Cryptophyta, reservoirs, fisheries. Introduction The area chosen for studying was subjected since 1980’ to strong anthropic modifications. The Miletin and Jijia Rivers were modified and a series of reservoirs and small ponds were created in order to decrease the flood risks in the Jijia River plain. The reservoirs were later transformed into fisheries and the intense aquaculture activity begun. These types of ponds and reservoirs used as fisheries are subjected to actions meant to increase the natural rate of fish growth. The most common method is the fertilization of waters for boosting the primary ring of the food chain represented by the phytoplankton. As a result, the algal blooms are followed by the development of the herbivorous zooplankton that graze the algae and predatory zooplankton that feed on the grazers. From this point, the fish are included in the food chain directly or indirectly. We became interested in the area and wanted to see the degree of change that occurs from the upper point, represented by Miletin River before its entry into Hălceni reservoir, until the lowest point, represented by Jijia River after passing besides the Larga Jijia reservoirs complex and draining the waste waters from the ponds (Aoncioaie et al. 2013). 1 Alexandru Ioan Cuza University of Iaşi; Interdisciplinary Research Department – Field: Science (Lascăr Catargi 54, 700107); carmensilva2003@yahoo.com (corresponding author*) 2 Alexandru Ioan Cuza University of Iaşi, Faculty of Biology (20 A, Carol I Blvd., 700505, Iași, Romania) 3 Alexandru Ioan Cuza University of Iaşi, Faculty of Geography and Geology (20 A, Carol I Blvd., 700505, Iași, Romania)