English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/40537
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

Population ecology of pike-cichlid, Crenicichla lepidota, in two streams of the Brazilian Pampa subject to a severe drought

AuthorsLobón-Cerviá, Javier ; Utrilla, C. G.; Querol, E.; Puig, Mariàngels
KeywordsCrenicichla lepidota
Streams
Brazil
Growth
Density
Production
Feeding strategy
Reproduction
Drought
Issue Date1993
PublisherWiley-Blackwell
CitationJournal of Fish Biology 43 : 537-557 (1993)
AbstractScales were valid for age determination of pike-cichlid Crenicichla lepidota Heckel in two Brazilian streams, since, for every age-class, annual rings (annuli) were formed once a year, in August. Back-calculated Jengths-for-age coincided with those obtained by inspecting the monthly length-frequency distributions. Only 11 reproductive females were captured (length range 9.6–16 cm, age 1+ and 2 +) and their fecundity (F) increased with fish length (L) according to: F= 2.4027 L2.3631. Average annual density and biomass in four localities of Zanga do Campus were 2194, 1676, 1824 and 1071 individuals ha−1 and 17.2, 12.1, 13.8 and 18.7 kg ha−1and about 1000 individuals ha−1 and 8.5 kg ha−1 in three combined sites of Zanga do Barbará. The annual production ranged between 18.5 and 32.7 kg ha−1 a −1 in the first stream and 8.7 kg ha −1a −1 in the other. Feeding tactics differed between streams and age-classes (0+v. 1+/2+). In winter, the 0+ age-class in Zanga do Campus fed mainly upon Ephemeroptera (Baetidae) but in other months also fed on zooplankton. In winter, these age-classes in Zanga do Barbara preyed upon benthic species but the contribution of different taxa varied between months. In January, these fish preyed exclusively upon Chydoridae and fish. The effects of a severe drought (November-February) upon these parameters are discussed.
Publisher version (URL)http://dx.doi.org/10.1111/j.1095-8649.1993.tb00438.x
URIhttp://hdl.handle.net/10261/40537
DOI10.1111/j.1095-8649.1993.tb00438.x
ISSN0022-1112
Appears in Collections:(CEAB) Artículos
Files in This Item:
There are no files associated with this item.
Show full item record
Review this work
 


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.