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Insect diversity in organic rice fields under two management systems of levees vegetation

Acosta, L G ; Jahnke, S M ; Redaelli, L R ; Pires, P R S

Brazilian journal of biology, 2017-11, Vol.77 (4), p.731-744 [Periódico revisado por pares]

Brazil: Instituto Internacional de Ecologia

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Título:
Insect diversity in organic rice fields under two management systems of levees vegetation
Autor: Acosta, L G ; Jahnke, S M ; Redaelli, L R ; Pires, P R S
Assuntos: Abundance ; abundância ; Agricultural ecosystems ; Agricultural practices ; Agriculture ; Agriculture - methods ; Animals ; arroz orgânico ; Arthropoda ; Arthropods ; Biodiversity ; BIOLOGY ; Brazil ; Cultivated plants ; Cultivation ; diversidade ; Ecosystem biology ; Environment ; Environmental changes ; Environmental management ; Flowers & plants ; Grain cultivation ; Guilds ; Insecta ; Insecta - physiology ; Insects ; Integrated pest management ; Levees ; Management systems ; Natural enemies ; Oryza ; Oryza - growth & development ; Parasitoids ; Pest control ; Pests ; Plant diversity ; Plantations ; Plants (botany) ; Predators ; Rice ; Rice fields ; riqueza ; Seedlings ; Species composition ; Strategic management ; Vegetation
É parte de: Brazilian journal of biology, 2017-11, Vol.77 (4), p.731-744
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: Simplified environments characterize agroecosystems, reducing the diversity of associated plants, which are not cultivated for economic purposes, causing unbalances that can promote the emergence of cultivated plants pests, as well as the reduction of their natural enemies. Management systems that increase diversity in agroecosystems can extend the action of natural enemies of pests. Studies to understand the diversity of insects associated with rice cultivation and determine their ecological guilds can provide information about the composition and structure of such ecosystems, which can be applied to integrated pest management. Therefore, the study aimed to describe and compare groups of insects in irrigated rice fields, with organic management using two different systems of levees vegetation management, and relate them to the phenological states of rice cultivation (seedling, vegetative, and reproductive). Samples were taken in a plantation located in Águas Claras district of Viamão, RS. The total area of 18 ha was divided into two. A subarea called not cut (NC), where wild vegetation of levees was maintained, and the subarea named cut (C), where monthly cuts were made to levees vegetation, from the beginning of soil preparation until the harvest. From October 2012 to March 2013 were held weekly collections in quadrats randomly located in both the rice fields and the levees. A total of 800 insects were collected, 429 in the C subarea and 371 in the NC. There were identified 97 morphospecies in the C and 108 in NC, being 54 shared between the subareas. The captured insects were grouped into guilds: saprophages (C = 38.2%; NC = 27.5%), phytophagous (C = 28.5%; NC = 33.2%), entomophagous (grouping parasitoids and predators) (C = 29.4%; NC = 35%) and finally other insects (C = 4 %; NC = 4.3%). The peak abundance of phytophagous and entomophagous was registered in the vegetative stage of rice. At the same stage the UPGMA analysis showed that similarity in species composition was greater than 90% in the groups obtained in the paddy fields of C and NC subareas. The vegetation of levees can positively influence the presence of entomophagous in the field. Although the abundance did not change clearly, the greatest diversity in the NC areas of all the groups, may contribute to the maintenance of ecological services expanding the system resilience.
Editor: Brazil: Instituto Internacional de Ecologia
Idioma: Inglês;Português

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Insect diversity in organic rice fields under two management systems of levees vegetation

Acosta, L G ; Jahnke, S M ; Redaelli, L R ; Pires, P R S

Brazil: Instituto Internacional de Ecologia

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