Temporal changes in the abundance of barbel, Barbus barbus in the Jihlava River, Czech Republic

0164555 - UBO-W 20030129 RIV CZ eng J - Journal Article
Peňáz, Milan - Pivnička, K. - Baruš, Vlastimil - Prokeš, Miroslav
Temporal changes in the abundance of barbel, Barbus barbus in the Jihlava River, Czech Republic.
Folia zoologica. Roč. 52, č. 4 (2003), s. 441-448. ISSN 0139-7893. E-ISSN 1573-1189
R&D Projects: GA ČR GA206/01/0586; GA AV ČR IAA6093105; GA AV ČR KSK6005114
Institutional research plan: CEZ:AV0Z6093917
Keywords : barbel
Subject RIV: EG - Zoology
Impact factor: 0.494, year: 2003
http://www.ivb.cz/folia/52/4/441-448.pdf

A four-year experiment with a total of 993 individually tagged barbel, Barbus barbus, resulted in the assessment of survival and abundance. The mean annual survival rate was 0.862, but the partial values assessed separately for seasons (spring - autumn and autumn - spring) differed considerably and the possible reasons for this phenomenon are discussed. On the basis of known survival rate, the abundance was subsequently estimated (for the entire studied stretch and per hectare) using the Petersen capture-recapture method for the period spring 1999 to autumn 2001, and the mean value reached 303 +- 110 ind.ha-1 (minimum 195, maximum 498 ind.ha-1). The Jolly-Seber method was used to estimate abundance from autumn 1999 to spring 2001 and gave a mean 425 +- 120 ind.ha-1 and a range 233-563 ind.ha-1. These results were in autumn 2001 supported by another simultaneously conducted census following the removal method by Zippin (316 ind.ha-1).
Permanent Link: http://hdl.handle.net/11104/0061773