Natural Hybrid Posterities - Problem for the Existence of the Acipenseridae Family Species in Nature
Journal Title: Ecologia Balkanica - Year 2013, Vol 5, Issue 2
Abstract
During the period 2005 - 2010 in Bulgarian territorial waters of the Black Sea and the Danube River four interspecies hybrids of sturgeons were caught. Hybrid № 1 was defined as Ship sturgeon ([i]Acipenser nudiventris[/i]) x Russian sturgeon ([i]Ac. gueldenstaedti[/i]) - second or third generation. Hybrid № 2 - [i]Ac. stellatus[/i] x [i]Ac. ruthenus[/i]. Hybrid № 3 - [i]Huso huso[/i] x [i]Ac. ruthenus[/i] (bester). Hybrid № 4 was with morphological signs of Russian sturgeon ([i]Ac. gueldenstaedti[/i]) and Sterlet ([i]Ac. ruthenus[/i]). The simultaneous catch of more than one specimen at the same time and place, supports the view that the amount of obtained natural hybrids in populations of sturgeon species with drastically reduced numbers increases.
Authors and Affiliations
Nikolay Tsekov, Angel Tsekov
Keywords
Related Articles
- EP ID EP88950
- DOI -
- Views 177
- Downloads 0
Assessing the Heavy Metal Content in Forest Dormouse (Dryomys nitedula Pallas, 1778) from an Agricultural Region in Bulgaria
The heavy metals load in the forest dormouse (Dryomys nitedula), inhabiting in forest shelter belts in the agricultural region was assessed. The concentrations of Cd, Co, Cu, Ni, Pb and Zn (expressed in mg/kg of dry tiss...
Diet of Threatened Pheasant Species in Himalayas, India – A Faecal Analysis Approach
The aim of this paper is to determine diet composition of threatened pheasant species i.e. Satyr Tragopan [i]Tragopan satyr[/i]a, Himalayan Monal [i]Lophophorus impejanus[/i], Kaleej [i]Lophura leucomelan[/i]a and Koklas...
Studies on Terrestrial Herbaceous Plants Tolerance to Excess Heavy Metals: Methodological Approach
Plant tolerance to heavy metals is а scientific issue attracting significant attention due to the possible use of tolerant plants for phytoremediation purposes as well as due to the fact that the molecular mechanisms of...
Fish in Ecotoxicological Studies
Water contamination (heavy metals, pesticides, POPs, etc.) is a serious environmental issue which has been raising lots of attention in the last decades because it can destroy aquatic ecosystems and hence, reduce biodive...
Age Structure and Historical Development of Forests in “Bistrishko branishte” Biosphere Reserve in Vitosha Mountain (Bulgaria)
In 2001 the territory of the Bistrishko Branishte reserve of the Vitosha Mountain (Bulgaria) was affected by wind throw. Almost 100% of the Picea abies trees on an area of 60 ha were overthrown. After 2003 in the periphe...