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Previous issue date: 2013-08-30 / Edaphic ecosystems are the basis for the production of terrestrial biological resources and
their dynamics affect not only the natural environment but also society and their economic
activities. In Caatinga biome, the semi-arid climate associated with an inadequate soil
management has increased the degradation and loss of productive potential of the soil. In this
context, the study of soil fauna, including springtails, becomes an important indicator of soil
quality. This study aimed to evaluate the fauna of Collembola in an area of Caatinga of Rio
Grande do Norte State and the influence of biotic and abiotic factors, such as soil, vegetation
and climate characteristics, on the structure of the taxocenosis. The environmental variables
which were used were the following ones: granulometry (represented by the proportion of
sand), quantity of organic matter and soil pH, richness, density and aerial biomass of the
vegetal structure, and necromass. We used pitfall traps intending to collect specimens of the
epiedaphic fauna of Collembola in 30 points located on Caua?u Farm, Jo?o C?mara, RN, in
July (rainy season) and November (dry season) 2011. We collected 5513 individuals of 15
species distributed in 13 genera and 9 families of Collembola. Five of the recorded species are
new to science, confirming the expected high degree of endemism for Caatinga biome, and
the highest abundance was recorded in the rainy season, which suggests Collembola
sensitivity to low humidity. Four species were more abundant in the dry season, all of them
belonged to the Order Entomobryomorpha. Results of statistical analyzes suggest that plant
species richness, aerial biomass of vegetal structure, proportion of sand in the soil, pH and
humidity are the main influences to the abundance of Collembola in the region studied / Os ecossistemas ed?ficos s?o base para toda produ??o de recursos biol?gicos terrestres e sua
din?mica afeta n?o apenas os ambientes naturais, mas tamb?m a sociedade e suas atividades
econ?micas. Na Caatinga, o clima semi?rido associado ao uso inadequado do solo t?m
potencializado a degrada??o e a perda do potencial produtivo das terras. Considerando que a
fauna ed?fica, incluindo os col?mbolos, ? um importante indicador da qualidade do solo, este
trabalho objetivou avaliar a fauna de Collembola numa ?rea de Caatinga do Rio Grande do
Norte, verificando a influ?ncia de fatores bi?ticos e abi?ticos, tais como caracter?sticas do
solo, da vegeta??o e do clima, sobre a estrutura da taxocenose. As vari?veis ambientais
utilizadas foram: granulometria (representada pela propor??o de areia), quantidade de mat?ria
org?nica e pH do solo; riqueza, densidade e biomassa a?rea vegetal; e necromassa. Foram
utilizadas armadilhas de queda (pitfall) para coletar esp?cimes da fauna epied?fica de
Collembola em 30 pontos localizados na Fazenda Caua?u, Jo?o C?mara, RN, nos meses de
julho (per?odo chuvoso) e novembro (per?odo seco) de 2011. Foram coletados 5.513
indiv?duos de 15 esp?cies, distribu?das em 13 g?neros e 9 fam?lias de Collembola. Cinco das
esp?cies registradas s?o novas para a ci?ncia, confirmando a expectativa de alto grau de
endemismo para o bioma, e a maior abund?ncia de indiv?duos foi registrada na esta??o
chuvosa, o que sugere sensibilidade dos col?mbolos ? baixa umidade. Quatro esp?cies foram
mais abundantes na esta??o seca, todas da Ordem Entomobryomorpha, e os resultados das
an?lises estat?sticas sugerem que a riqueza de plantas, a biomassa vegetal a?rea, a propor??o
de areia no solo, o pH e a umidade devida ?s chuvas sejam os principais influenciadores da
abund?ncia de Collembola na regi?o estudada
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/18131 |
| Date | 30 August 2013 |
| Creators | Rocha, Isabel Medeiros dos Santos |
| Contributors | CPF:96425601434, http://lattes.cnpq.br/8396727262741273, Bellini, Bruno Cavalcante, CPF:00990546470, http://lattes.cnpq.br/8609476121598138, Pichorim, Mauro, CPF:50373625987, http://lattes.cnpq.br/5696697654544552, Abrantes, Eduardo Assis, CPF:08256831731, http://lattes.cnpq.br/7577087909473834, Vasconcellos, Alexandre |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Sistem?tica e Evolu??o, UFRN, BR, Ci?ncias Biol?gicas |
| 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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