Forest Fragmentation And Landscape Structure In The Guamá River Basin, Eastern Amazon

Rocha, Nívia Cristina Vieira; Lima, Aline Maria Meiguins de; Adami, Marcos

doi:10.24057/2071-9388-2020-130

Cited by 3 publications

(3 citation statements)

References 34 publications

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“…O Estado de Rondônia é uma paisagem fragmentada, apresentando aproximadamente metade dos seus componentes (nós e links) isolados estruturalmente. Tal característica típica de uma paisagem que sofre diretamente com desmatamento (BRASIL et al, 2022;ROCHA et al, 2021;LEAL et al, 2019).…”

Section: Discussionunclassified

Efeitos Da Regeneração Florestal Na Conectividade Da Paisagem Do Estado De Rondônia, Amazônia, Brasil

Santos Brasil,

Dalla Corte,

Roberto Sanquetta

et al. 2024

NAT

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A manutenção da biodiversidade em ambientes florestais depende da conectividade da paisagem, tal ligação entre os habitats florestais sofrem diretamente com o desmatamento. A restauração da floresta pode proporcionar o retorno da movimentação de indivíduos entre os habitats florestais. Dessa forma, o objetivo deste estudo foi avaliar, por meio de índices de conectividade, a contribuição do aumento das áreas de regeneração florestal na conectividade da paisagem do estado de Rondônia. As imagens utilizadas foram da coleção Landsat. A classificação do solo foi feita na plataforma Google Earth Engine pelo algoritmo Random Forest. Foram calculadas as métricas de conectividade da paisagem, sendo: Índice de Área Conectada Equivalente (ECA) e Diferença de Probabilidade da Conectividade (dPC), ambas calculadas com o software GuidosToolbox. Os resultados revelaram que o estado de Rondônia não apresentou diferenças expressivas com o incremento das áreas de regeneração florestal em ambas as métricas de conectividade da paisagem. O resultado mais notável foi o aumento de importância de conectividade dos nós grandes, fragmentos de grandes dimensões, com o acrescimento das áreas de regeneração. Sendo assim, concluiu-se que as áreas de regeneração florestal contribuíram para a melhoria dos indicadores de conectividade, mas não expressivamente. Palavras-chave: fragmentação, regeneração, ecologia da paisagem, imagens digitais. Effects of forest regeneration on landscape connectivity in the state of Rondônia, Amazon, Brazil ABSTRACT: The maintenance of biodiversity in forest environments depends on landscape connectivity; this linkage between forest habitats is directly affected by deforestation. Forest restoration can facilitate the movement of individuals between forest habitats. Thus, through connectivity indices, this study aimed to evaluate the contribution of increased forest regeneration areas to landscape connectivity in the state of Rondônia. Landsat images were utilized for this analysis. The Random Forest algorithm conducted soil classification on the Google Earth Engine platform. Landscape connectivity metrics were calculated, including the Equivalent Connected Area Index (ECA) and the Connectivity Probability Difference (dPC), both computed with GuidosToolbox software. The results revealed that the state of Rondônia showed no significant disparities with the increase in forest regeneration areas in either landscape connectivity metric. The most notable outcome was the heightened importance of connectivity for large nodes and large-sized fragments with the addition of regeneration areas. Therefore, it was concluded that forest regeneration areas contributed to improving connectivity indicators, albeit not notably. Keywords: fragmentation; regeneration; landscape ecology; digital image.

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Section: Discussionunclassified

Efeitos Da Regeneração Florestal Na Conectividade Da Paisagem Do Estado De Rondônia, Amazônia, Brasil

Santos Brasil,

Dalla Corte,

Roberto Sanquetta

et al. 2024

NAT

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“…This is especially concerning when combined with expected reductions in other mammal orders that play crucial ecological roles and that have been shown to be vulnerable to climate change, such as Primates and Chiroptera (Ribeiro et al ., 2016; Sales et al ., 2020a, 2020b). Moreover, large ungulates are also the species most affected by forest loss and fragmentation outside of protected areas in this region (Rocha, 2021). Decimated by hunting and loss of natural habitat throughout the Neotropics (Bogoni, Peres, & Ferraz, 2020), they are likely particularly dependent on protected areas (e.g.…”

Section: Discussionmentioning

confidence: 99%

Habitat use patterns suggest that climate‐driven vegetation changes will negatively impact mammal communities in the Amazon

Rocha

Sollmann

2023

Animal Conservation

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Climate change will affect species persistence and distribution, particularly in high‐diversity ecosystems like the Amazon. Studies predict that as temperature and deforestation increase and precipitation patterns change in the Amazon, areas along its southern and eastern borders will suffer large‐scale savannization, the conversion of tropical forest to degraded savannah‐like vegetation. Here, we aim to identify the terrestrial mammal species potentially most at risk from savannization by studying their use of natural forest and savannah habitats within four protected areas, using camera‐trap surveys and community occupancy models. We grouped species into categories according to the overlap of their global distributions with the Amazon and Cerrado biome (Amazon, Cerrado and generalist species) and investigated the effect on their space use of savannah cover within a 100‐m buffer, and of the immediate habitat type (continuous forest, riparian forest and savannah) at the camera trap. Both savannah cover and savannah habitat type affected space use of most Amazon and generalist species strongly negatively. Only Cerrado species ever showed strong positive responses to savannah cover. These results suggest that most of the terrestrial mammal community is potentially vulnerable to savannization, including several species typically considered habitat generalists. Negative effects of disturbed savannah‐like habitats are likely even stronger than effects of natural savannah reported here. Although less favorable than continuous forest, riparian forest had a strong negative effect for only a small fraction of species, indicating that effects of savannization may be buffered to some extent by riparian forests. Our results suggest that climate change‐induced vegetation changes may reduce the ability of protected areas in the southern Brazilian Amazon to safeguard populations of terrestrial mammals and should be considered when assessing potential climate‐change effects on these species.

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“…These interventions had converted extensive and continuous areas covered with forests into agriculture, urban areas, and other covers, causing environmental impacts. In many cases, the lack of planning for these processes threatens water sustainability of basins in the Amazon region (Yesuph & Dagnew 2019;Rocha;de Lima & Adami, 2021).…”

Section: Introductionmentioning

confidence: 99%

Landscape Cartography In The Maranhense Amazon: The Case Of The Lower Course Of The Pindaré River Basin

Medeiros,

Dos Santos,

Bezerra

et al. 2024

GES

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The landscape cartography assesses the functional, dynamic, structural and morphological aspects of landscapes, regardless of their taxonomic scale. It seeks to use these units to support environmental and territorial planning and management. Thus, the present study sought to apply this line of analysis to the Pindaré River Basin, precisely in its lower course, located in the Brazilian state of Maranhão. The objective was to identify, classify, map and analyze the landscapes of the lower course through the correlation of variables related to geology, relief, soils, land use and land cover providing data to support and promote preservationist and conservationist public policies and actions in the area. The methodology identified four levels of landscape analysis, from morphometric aspects, geoforms and upper units to reaching the final landscape map, using field output, digital elevation models and satellite images to validate information. The procedures allowed to identify the landscape heterogeneity in a unique environment of saturated and periodically flooded soils contrasting with extensive pastures and little native vegetation. As a result, seven first-level landscape units were identified, coming up to fifty-eight sub-units in the final map. The work aims to apply the methodology in an area of the Maranhão State where few studies on landscape cartography have occurred. The target is to comprehend possible relationships between the functional and structural potential of landscapes and their relationship with the current intensity of land use, contributing to physical- territorial planning permeating geoecological sustainability.

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Forest Fragmentation And Landscape Structure In The Guamá River Basin, Eastern Amazon

Cited by 3 publications

References 34 publications

Efeitos Da Regeneração Florestal Na Conectividade Da Paisagem Do Estado De Rondônia, Amazônia, Brasil

Efeitos Da Regeneração Florestal Na Conectividade Da Paisagem Do Estado De Rondônia, Amazônia, Brasil

Habitat use patterns suggest that climate‐driven vegetation changes will negatively impact mammal communities in the Amazon

Landscape Cartography In The Maranhense Amazon: The Case Of The Lower Course Of The Pindaré River Basin

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