Study on the Changes of Biotic Variables, Their Influence on the Primary Productivity and the Effect of Manuring of Fish Ponds
Journal Title: Ecologia Balkanica - Year 2016, Vol 8, Issue 2
Abstract
The experiment was carried out in the period 2004-2006 on seven fish ponds of the Institute for Fishery and Aquaculture in Plovdiv city, Bulgaria with a single area varying from 1.8 to 3.9 daа. Powered fertilization with cattle manure on dose 3000 kg.ha-1 was applied. The aim of the experiment was to study the relations between the biotic factors (zooplankton, phytoplankton, zoobenthos, chlorophyll a, macrophytes, bacterioplankton, percent of energy utilization by primary productivity (PEU), their influence on the primary productivity and the effect of manuring on the fish ponds. The bigger part of the biotic factor variation was defined by the differences between the monthly samplings compared to the changes between the ponds within the period of investigation (2004/05/06). There was a difference between the first and last months concerning the biotic factors. This great seasonal variability decreases the opportunity for revealing the differences between the manured and the control ponds. The biotic factors as the PP (primary productivity), respiration and PEU in the manured ponds were higher compared to the control ponds during 2005. More macrophytes and higher PP/respiration and PP/chlorophyll а ratios were detected in the control ponds. Increased biotic variable values of the PP, respiration and chlorophyll а were found in the manured ponds during 2006. The derived relationships might contribute for enhanced productivity of carp ponds and for improvement of existing management practices in the view of better water quality in fish farming.
Authors and Affiliations
Doychin Terziyski, Roumen Kalchev, Hristina Kalcheva, Vesselin Alexandrov
Keywords
Related Articles
- EP ID EP201893
- DOI -
- Views 136
- Downloads 0
Data on Bird Mortality in “Sakar” IBA (BG021), Caused by Hazardous Power Lines
Bird mortality caused by 20 kV power lines was studied in “Sakar” Important Bird Area (IBA). In the period between February 2008 - April 2009, six power lines with a total length of 44,6 km and 450 electric poles of diff...
The Trophic Spectrum of the Northern White-Breasted Hedgehog (Erinaceus roumanicus Barrett-Hamilton, 1900) in Plovdiv City, Bulgaria
The food spectrum of the Northern white-breasted hedgehog (Erinaceus roumanicus Barrett-Hamilton, 1900) was studied based on the number of specimens/fruits in its excrements. A total of 181 scats (19 food items) from hed...
[i]Cicada orni [/i]L. in the Food of Wild Boar in the Regional Park Maremma – Toscana, Italy
The study was conducted in the period 1991-2000, in the в Regional Park Maremma – Toscana, Central Italy. The park area is about 9800 ha, covered by Mediterranean vegetation: [i]Pinus halepensis[/i] Mill., [i]P...
Distribution and Assessment of the Nature Conservational Status of the Nature Habitat 91Z0 „Moesian Silver Lime Forests” in SCI „Svishtovska Gora“ (BG0000576), Bulgaria
The protected zones or Site of community importance (SCI) are Natura 2000 areas which aim is to assure conditions for protection and survival of the most valuable and threatened species and habitats in Europe. Protected...
Morphology and Food Plants of Cuckoo Bees (Apidae: Hymenoptera) From Indian Himalayas
Cuckoo bees belong to the genus Bombus (Apidae: Hymenoptera) under sub genus Psythrus Lepeletier and is widely distributed subgenus from the oriental region represented by 17 valid species. This subgenus is represented b...