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Revisado por pares
Fish assemblage stability in an intermittently flowing stream from the Brazilian semiarid region
2008; Wiley; Volume: 26; Issue: 2 Linguagem: Inglês
10.1111/j.1442-9993.2001.tb00094.x
ISSN1442-9993
AutoresElvio Sérgio Figueredo Medeiros, Leonardo Maltchik,
Tópico(s)Hydrology and Sediment Transport Processes
ResumoAustral EcologyVolume 26, Issue 2 p. 156-164 Token Access Fish assemblage stability in an intermittently flowing stream from the Brazilian semiarid region Elvio S. F. Medeiros, Elvio S. F. Medeiros Universidade Federal da Paraiba, Departamento Sistemática e Ecologia, João Pessoa, Paraiba andSearch for more papers by this authorLeonardo Maltchik, Corresponding Author Leonardo Maltchik Universidade do Vale do Rios dos Sinos (UNISINOS), Centro II, Avenida Unisinos, 950- Cep. 93022-000, São Leopoldo, Rio Grande do Sul, Brazil (Email: maltchik@cirrus.unisinos.br)*Corresponding author.Search for more papers by this author Elvio S. F. Medeiros, Elvio S. F. Medeiros Universidade Federal da Paraiba, Departamento Sistemática e Ecologia, João Pessoa, Paraiba andSearch for more papers by this authorLeonardo Maltchik, Corresponding Author Leonardo Maltchik Universidade do Vale do Rios dos Sinos (UNISINOS), Centro II, Avenida Unisinos, 950- Cep. 93022-000, São Leopoldo, Rio Grande do Sul, Brazil (Email: maltchik@cirrus.unisinos.br)*Corresponding author.Search for more papers by this author First published: 20 December 2001 https://doi.org/10.1046/j.1442-9993.2001.01099.xCitations: 36Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Abstract Flooding and drought are important hydrological disturbances occurring in intermittent streams located in semiarid regions. The present study aims to analyse the effects of flood and drought on the diversity and stability of an intermittent stream fish community from the Brazilian semiarid region over the 1996 hydrological cycle. Fourteen fish collections were conducted during the rewetting, wet and drying phases, and 808 individuals were collected. Diversity was measured by using Simpson's Index (S) and community stability was analysed by using the variation in the abundance, then tested by applying Kendall's (W) test of concordance over the relative abundance rankings. This test supplies information about the stability of communities by means of the concordance of rankings. A community that is stable or near equilibrium has more constant rankings of its constituent species compared with a fluctuating one. The diversity increased progressively during the rewetting phase (S = 0.480–0.693; coefficient of variation = 0.131), reached its highest values during the wet phase (S = 0.745–0.861; coefficient of variation = 0.072), and remained high during the drying phase, with a lower oscillation than in the other phases (S = 0.699–0.801; coefficient of variation = 0.050). The abundance per collection varied significantly (Kruskal– Wallis 6.94, P = 0.031) throughout the hydrological phases. The stability of the community was higher during the rewetting (W = 0.58, P < 0.001) and drying (W = 0.86, P < 0.001) phases than during the wet phase (W = 0.45, P = 0.1818). In the Brazilian semiarid region, flooding disrupted the stability of the fish community studied and increased the diversity, whereas the absence of floods (expressed by the drying phase) caused a higher stability of the fish community and led to less variation in diversity. Citing Literature Volume26, Issue2April 2001Pages 156-164 RelatedInformation
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