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Previous issue date: 2010-03-26 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / In Brazilian semiarid region, the majority of water bodies are temporary and the biodiversity in these ecosystems is poorly known. The goal of this study was to describe the temporal variation of benthic macroinvertebrates in an intermittent stream in the Brazilian semiarid region. From March to July of 2009, surveys of benthic macroinvertebrates and water physiochemical parameters were done in a first order stream located at Piranhas-A?u River basin. 25 macroinvertebrates families were found, 21 belonging to Insecta class. The chironomids were the most abundant group during all study period and were represented by 19 genus. The largest densities and taxonomic richness were seen in the drying phase of the stream while the smallest values were found in the period with the heaviest rainfalls ( wet phase ). Only the families Chironomidae and Ceratopogonidae were found during all study period, suggesting that these groups have better adaptations to support floods and droughts. Furthermore, these two groups seemed to be pioneering in this stream. Among the chironomids, Paratendipes dominated the period of floods while Tanytarsus were more abundant in the drying phase . This study showed that hydrological fluctuation is the main force influencing the macroinvertebrate community in this stream, therefore, efforts seeking the conservation and management of Brazilian semiarid water bodies should consider this high natural variability in flow regime / O semi?rido brasileiro possui grande parte de seus corpos de ?gua com car?ter tempor?rio e pouco se conhece sobre a biodiversidade destes ambientes e os fatores que influenciam esta diversidade. O presente estudo teve como objetivo caracterizar a varia??o temporal dos macroinvertebrados bent?nicos de um riacho intermitente da regi?o do semi?rido brasileiro. Foram feitas 11 amostragens da fauna de macroinvertebrados bent?nicos e de par?metros f?sico-qu?micos da ?gua em um riacho de primeira ordem da bacia hidrogr?fica do rio Piranhas-A?u durante o per?odo de mar?o a julho de 2009. Foram encontradas 25 fam?lias de organismos sendo 21 destes da classe Insecta. A fam?lia Chironomidae foi a mais abundante em todo per?odo amostral e foi representada por 19 g?neros. As maiores densidades de organismos e riqueza taxon?mica ocorreram no per?odo em que o riacho estava secando e as menores no per?odo das maiores precipita??es. Apenas as fam?lias de Diptera, Chironomidae e Ceratopogonidae, ocorreram durante todo per?odo amostral, sugerindo que estes organismos possuem melhores mecanismos de adapta??es frente ?s cheias e secas. Al?m disso, estes dois grupos pareceram ser os colonizadores prim?rios neste ambiente. Entre os quironom?deos, o g?nero Paratendipes dominou o per?odo de cheias enquanto Tanytarsus foi mais abundante no per?odo secando do riacho. Nosso estudo demonstrou que as flutua??es hidrol?gicas foram os fatores que mais influenciaram a comunidade dos macroinvertebrados bent?nicos no riacho, e assim, estrat?gias visando a conserva??o e gest?o destes ambientes devem considerar estas flutua??es
Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/12492 |
Date | 26 March 2010 |
Creators | Costa, Lucas Gomes |
Contributors | CPF:24322253415, http://lattes.cnpq.br/0984577704595246, Attayde, Jos? Luiz, CPF:03130326707, http://lattes.cnpq.br/4121209629385349, Medeiros, Elvio S?rgio Figueiredo, CPF:95218823449, Andrade, Herbet Tadeu de Almeida |
Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Bioecologia Aqu?tica, UFRN, BR, Bioecologia Aqu?tica |
Source Sets | IBICT Brazilian ETDs |
Language | Portuguese |
Detected Language | English |
Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
Format | application/pdf |
Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
Rights | info:eu-repo/semantics/openAccess |
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