Banca de DEFESA: ISAMARA DOS REIS SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ISAMARA DOS REIS SILVA
DATE: 27/10/2021
TIME: 09:00
LOCAL: Sala virtual no zoom
TITLE:

Conservation of shade-tolerant plant diversity in agricultural mosaics in Eastern Amazon

KEY WORDS:

Alpha diversity; Beta diversity; Gamma diversity; Conservation Value Index; Species richness; Land use types

PAGES: 65
BIG AREA: Ciências Agrárias
AREA: Recursos Florestais e Engenharia Florestal
SUBÁREA: Conservação da Natureza
SUMMARY:

With the increase in deforestation associated with the need to reconcile conservation and food production, agricultural mosaics are of great importance for maintaining diversity, but with conservation values still unrecognized. A promising approach to understanding species distribution patterns in agricultural mosaics is to understand the factors that act on each of its components: local diversity (alpha diversity), variation in species composition between locations (beta diversity) and total regional diversity (gamma diversity); the vegetation stratification is also important, as the strata establish different niches for the plants, consequently influencing the independence of the diversity found in the vertical strata. In this sense, this work evaluated the response of each component of the diversity of shade-tolerant plants in agricultural mosaics in Eastern Amazon, considering three strata of the vegetation cover separately. The study was carried out in six agricultural mosaics located in different regions of the State of Pará. The vegetation cover inventory was carried out within each mosaic in the main types of land use, in the upper, middle and lower strata. After identification and classification into ecological groups, only shade-tolerant species were selected, since these are the most important species in the analyzes aimed at the conservation of forest species. The diversity of each mosaic and each stratum was partitioned into alpha diversity (or parcels), beta 1 diversity (β1, within the types of uses) and beta 2 diversity (β2, between the types of uses), using the additive model and species richness as a measure of diversity. A generalized linear model (GLM) analysis was performed to assess the influence of geographic factors, stratum, rainfall, number of dry months, forest cover and number of types of uses. The contribution of each plot in the gamma diversity, the contribution of the types of uses to the alpha and total beta diversity, and the conservation value index of the types of uses were also verified. The diversity partition showed observed values of alpha and β1 lower than expected and observed values of β1 higher than expected. In general, the evaluation of alpha, β1 and β2 richness components of shade-tolerant plants analyzed here showed clear patterns in alpha and β2, and that β1 is more dependent on the types of uses found in agricultural mosaics. Among the factors tested, alpha richness responded only to strata, β1 responded to mosaics and strata, and β2 responded only to the amount of annual precipitation. The contributions of plots and types of use differ between components of diversity, and these between mosaics and strata, hence the conservation value also differs. The conservation value of mature forests is influenced by the percentage of forest cover in the mosaics, but the conservation value of secondary forests does not depend on this percentage. 

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Interno - 3160854 - DIVINO VICENTE SILVERIO
Interno - 741.673.590-49 - GUSTAVO SCHWARTZ - EMBRAPA
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Externo à Instituição - MARCELO TABARELLI - UFPE