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      Índices de vegetación y unidades de paisaje de la Reserva de Fauna Silvestre Ciénaga de La Palmita e Isla de Pájaros, estado Zulia, Venezuela Translated title: Vegetation indices and landscape units of the Wildlife Fauna Reservoir Ciénaga de La Palmita and Isla de Pájaros, Zulia state, Venezuela Translated title: Índices de vegetação e unidades paisagísticas da Reserva Natural de Ciénaga da Palmita e Ilha de Pájaros, estado de Zulia, Venezuela

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          Abstract

          Resumen Se determinaron los índices de vegetación y las unidades de paisaje de la Reserva de Fauna Silvestre Ciénaga de La Palmita e Isla de Pájaros, empleando imágenes LANDSAT 8 (2013-2016) y el NDVI usando el programa ENVI. Se identificaron siete unidades de paisaje. El espejo de agua mostró un NDVI bajo (0,00-0,03), asociado al muy escaso vigor vegetal y el borde ciénaga-porción terrestre presentó 0,04-0,08 vinculado a los primeros indicios de productividad. Los suelos fangosos-desnudos revelaron 0,09-0,16 relacionado a escasas capas de fitoplancton. Las comunidades xerófilas intervenidas presentaron 0,17-0,24 contrastando con 0,25-0,28 de las formaciones xerófilas, espinosas y semideciduas bajas. Las comunidades de Avicennia germinans, Conocarpus erectus y Laguncularia racemosa mostraron 0,29-0,39 debido al bajo porte e individuos muertos; y Rhizophora mangle reveló 0,4-0,55, vinculado con la altura arborea, dosel semicerrado, pocos claros y verdor foliar intenso-brillante. Las unidades variaron desde comunidades xerófilas intervenidas hasta comunidades de R. mangle relativamente bien conservadas.

          Translated abstract

          Abstract Vegetation indices and landscape units of the Wildlife Fauna Reservoir Ciénaga de La Palmita and Isla de Pájaros were determined, using LANDSAT 8 images (2013-2016) and the NDVI using the ENVI program. Seven landscape units were identified. The water surface of the swamp showed a low NDVI (0.00-0.03), associated with very little plant vigor and the swamp-land portion presented 0.04-0.08 linked to first signs of productivity. Muddy-bare soils revealed 0.09-0.16 related to scarce layers of phytoplankton. Disturbed xerophytic communities presented 0.17-0.24, contrasting with 0.25-0.28 of the xerophytic, spiny and semi-deciduous formations. The communities of Avicennia germinans, Conocarpus erectus and Laguncularia racemosa showed 0.29-0.39 due to low size and dead individuals; and Rhizophora mangle revealed 0.4-0.55, linked to arborea height, semi-enclosed canopy, few gaps and intense-bright leaf greenery. The units ranged from disturbed xerophytic scrubs to relatively well preserved R. mangle communities

          Translated abstract

          Resumo Os índices de vegetação e as unidades de paisagem da Reserva de Vida Selvagem Ciénaga, da Fauna da Palmita e Ilha de Pájaros foram determinados usando imagens do LANDSAT 8 (2013-2016) e o NDVI usando o programa ENVI. Sete unidades de paisagem foram identificadas. O corpo de água apresentou baixo NDVI (0,00-0,03), associado a um vigor muito baixo das plantas, e a borda da porção de pântano-terra apresentou 0,04-0,08, associada aos primeiros sinais de produtividade. Os solos lamacentos revelaram 0,09-0,16, relacionados às camadas esparsas de fitoplâncton. As comunidades xerófitas intervenientes apresentaram 0,17-0,24, contrastando com 0,25-0,28 para as formações xerófilas, espinhosas e baixas semidecíduas. As comunidades de Avicennia germinans, Conocarpus erectus e Laguncularia racemosa apresentaram 0,29-0,39 devido ao seu baixo tamanho e indivíduos mortos; e Rhizophora mangle revelaram 0,4-0,55, ligados a altas árvores, copa semi-fechada, poucas brechas e vegetação de folha intensa e brilhante. As unidades variaram de comunidades xerófitas intervenientes a comunidades de R. mangle relativamente bem preservadas

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          Using the satellite-derived NDVI to assess ecological responses to environmental change.

          Assessing how environmental changes affect the distribution and dynamics of vegetation and animal populations is becoming increasingly important for terrestrial ecologists to enable better predictions of the effects of global warming, biodiversity reduction or habitat degradation. The ability to predict ecological responses has often been hampered by our rather limited understanding of trophic interactions. Indeed, it has proven difficult to discern direct and indirect effects of environmental change on animal populations owing to limited information about vegetation at large temporal and spatial scales. The rapidly increasing use of the Normalized Difference Vegetation Index (NDVI) in ecological studies has recently changed this situation. Here, we review the use of the NDVI in recent ecological studies and outline its possible key role in future research of environmental change in an ecosystem context.
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            Ndvi: Vegetation Change Detection Using Remote Sensing and Gis – A Case Study of Vellore District

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              Mangrove dieback during fluctuating sea levels

              Recent evidence indicates that climate change and intensification of the El Niño Southern Oscillation (ENSO) has increased variation in sea level. Although widespread impacts on intertidal ecosystems are anticipated to arise from the sea level seesaw associated with climate change, none have yet been demonstrated. Intertidal ecosystems, including mangrove forests are among those ecosystems that are highly vulnerable to sea level rise, but they may also be vulnerable to sea level variability and extreme low sea level events. During 16 years of monitoring of a mangrove forest in Mangrove Bay in north Western Australia, we documented two forest dieback events, the most recent one being coincident with the large-scale dieback of mangroves in the Gulf of Carpentaria in northern Australia. Diebacks in Mangrove Bay were coincident with periods of very low sea level, which were associated with increased soil salinization of 20–30% above pre-event levels, leading to canopy loss, reduced Normalized Difference Vegetation Index (NDVI) and reduced recruitment. Our study indicates that an intensification of ENSO will have negative effects on some mangrove forests in parts of the Indo-Pacific that will exacerbate other pressures.
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                Author and article information

                Journal
                arca
                Alfa Revista de Investigación en Ciencias Agronómicas y Veterinaria
                Rev. Inv. Cs. Agro. y Vet.
                CET-BOLIVIA (La Paz, , Bolivia )
                L:2664-0902
                2664-0902
                August 2020
                : 4
                : 11
                : 157-169
                Article
                S2664-09022020000200005 S2664-0902(20)00401100005
                6f678583-9766-4fdd-8c6e-2203bfdea70e

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 2020
                : 2020
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 29, Pages: 13
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                SciELO Bolivia

                Self URI: Texto completo solamente en formato PDF (ES)
                Categories
                INVESTIGACIONES

                vegetação xerofítica,distúrbios antropogênicos,Lago de Maracaibo,sensoriamento remoto,NDVI,wetland,xerophytic vegetation,mangrove,Lake of Maracaibo,anthropogenic disturbances,sensores remotos,remote sensing,humedal,manglar,vegetación xerófila,perturbaciones antropogénicas,pantanal,manguezal

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