Topography and vegetation structure mediate drought impacts on the understory of the South American Atlantic Forest

Hollunder, Renan Köpp; Mariotte, Pierre; Carrijo, Tatiana Tavares; Holmgren, Milena; Luber, Jaquelini; Stein-Soares, Bethina; Guidoni‐Martins, Karlo Gregório; Ferreira-Santos, Karina; Scarano, Fábio Rúbio; Garbin, Mário Luís

doi:10.1016/j.scitotenv.2020.144234

Cited by 15 publications

(44 citation statements)

References 67 publications

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“…Pioneer species occurring in those secondary forests present high mortality during drought periods (Rocha et al, 2020 ), but high recovery rates after a drought event (Gazol et al, 2017 ; Poorter et al, 2016 ). Those evidences may suggest that the type of forest is an important factor controlling drought resilience because dry and wet forests distinguish in vegetation structure and soil nutrients (Dexter et al, 2018 ; Raulino et al, 2020 ; Figure 2 ), both important components affecting tree growth and mortality (Gessler et al, 2017 ; Hollunder et al, 2021 ).…”

Section: Drought Resilience In Different Types Of Forestsmentioning

confidence: 99%

“…Biotic factors, such as species traits and vegetation structure, are also driven by topography (Figures 2 and 3 ; Jucker, Bongalov, et al, 2018 ; Rodrigues et al, 2019 ). Topography is thus an important factor to take into account to understand drought impacts in plant communities due to the role of those factors in survival and growth of plant species (Hollunder et al, 2021 ; O'Brien et al, 2017 ).…”

Section: Drought Resilience Across Topographic Gradientsmentioning

confidence: 99%

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Regional and local determinants of drought resilience in tropical forests

Hollunder

Garbin

Scarano

et al. 2022

Ecology and Evolution

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The increase in severity of droughts associated with greater mortality and reduced vegetation growth is one of the main threats to tropical forests. Drought resilience of tropical forests is affected by multiple biotic and abiotic factors varying at different scales. Identifying those factors can help understanding the resilience to ongoing and future climate change. Altitude leads to high climate variation and to different forest formations, principally moist or dry tropical forests with contrasted vegetation structure. Each tropical forest can show distinct responses to droughts. Locally, topography is also a key factor controlling biotic and abiotic factors related to drought resilience in each forest type. Here, we show that topography has key roles controlling biotic and abiotic factors in each forest type. The most important abiotic factors are soil nutrients, water availability, and microclimate. The most important biotic factors are leaf economic and hydraulic plant traits, and vegetation structure. Both dry tropical forests and ridges (steeper and drier habitats) are more sensitive to droughts than moist tropical forest and valleys (flatter and wetter habitats). The higher mortality in ridges suggests that conservative traits are not sufficient to protect plants from drought in drier steeper habitats. Our synthesis highlights that altitude and topography gradients are essential to understand mechanisms of tropical forest's resilience to future drought events. We described important factors related to drought resilience, however, many important knowledge gaps remain. Filling those gaps will help improve future practices and studies about mitigation capacity, conservation, and restoration of tropical ecosystems.

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Section: Drought Resilience In Different Types Of Forestsmentioning

confidence: 99%

Section: Drought Resilience Across Topographic Gradientsmentioning

confidence: 99%

Regional and local determinants of drought resilience in tropical forests

Hollunder

Garbin

Scarano

et al. 2022

Ecology and Evolution

Self Cite

View full text Add to dashboard Cite

show abstract

“…3, Jucker et al, 2018a;Rodrigues et al, 2019). Topography is thus an important factor to take into account to understand drought impacts in plant communities due to the role of those factors in survival and growth of plant species (O'Brien et al 2017, Hollunder et al 2021.…”

Section: Drought Resilience Across Topographic Gradientsmentioning

confidence: 99%

“…Studies in tropical forests have shown that woody plant species occurring in valleys can be more resistant than the ones occurring in ridges (Table 1). Valleys can act as refuges, providing nutrients and water during droughts (Costa et al 2020, Hollunder et al 2021. Furthermore, shade availability in valleys can reduce drought impacts and improve the performance of plant species during drought periods (Holmgren et al 2012).…”

Section: Drought Resilience Across Topographic Gradientsmentioning

confidence: 99%

Regional and local determinants of drought resilience in tropical forests

Hollunder

Garbin

Scarano

et al. 2021

Preprint

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The increase in severity of droughts associated with greater mortality and reduced vegetation growth is one of the main threats to tropical forests. Drought resilience of tropical forests is affected by multiple biotic and abiotic factors varying at different scales. Identifying those factors can help understanding the resilience to ongoing and future climate change. Altitude leads to high climate variation and to different forest formations, principally moist or dry tropical forests with contrasted vegetation structure. Each tropical forest can show distinct responses to droughts. Locally, topography is also a key factor controlling biotic and abiotic factors related to drought resilience in each forest type. Both dry tropical forests and ridges (steeper and drier habitats) are more sensitive to droughts than moist tropical forest and valleys (flatter and wetter habitats). The most important biotic factors are leaf economic and hydraulic plant traits, and vegetation structure. The most important abiotic factors are soil nutrients, water availability and microclimate. Here we show that topography has key roles controlling biotic and abiotic factors in each forest type. Our synthesis highlights that gradients of altitude and topography are essential to understand tropical forest’s resilience to future drought events. We described important factors related to drought resilience, however many important knowledge gaps remain. Filling those gaps will help improve future practices and studies about mitigation capacity, conservation, and restoration of tropical ecosystems.

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“…effect on the diversity, regeneration, and structure of tropical and temperate forests worldwide(Wagner et al 2020, Tiwari et al. 2020, Ou et al, 2020, and Hollunder et al 2021…”

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confidence: 99%

Assessing Environmental Criteria to Support Forest Connectivity

Vanderley-Silva

Valente

2021

Preprint

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Establishing forest connection in landscapes under urban sprawl is essential for maintaining the ecological processes and ensuring biodiversity conservation. However, the major challenge is incorporated the ecological network in the land-use/land-cover planning. This way, the main objective of the study was the evaluation of environmental criteria for prioritizing areas to obtain forest functional connectivity in a landscape subject to the urban sprawl. The second objective was to understand how the criteria are associated with the structural forest attributes represented by traditional landscape ecology metrics. The criteria were defined through the literature review, representing the landscape characteristics as the topographic, conflicts, and biotics. The metrics used to characterize the forest structure were perimeter, shape index, and distance to the nearest neighbor. They were generated to a selected group of forest remnants, which represent the landscape forest structure. Sampling the criteria and forest fragments maps (i.e., different maps representing the metrics-values) through the hexagon network, we assessed how the criteria are associated with the structural forest attributes. The statistical analysis used to evaluate these sampled values were The Moran Global (Moran I) and Moran Local (LISA). We obtained that the urban expansion process is diffuse, although it does not occur randomly in our landscape. The criteria slope, TWI, distance from drainage network, distance from highways, distance from the low-density urban area, and distance from forest patches have characteristics that support this process. Furthermore, our results indicated a spatial autocorrelation among metrics and after, among metrics and these criteria. Also, we obtained that the external influences on the fragments did not occur randomly and that the criteria act on the landscape. This way, through these criteria, we can identify regions where it is possible to have the persistence of forest fragments, even though in places under the impact of urban sprawl.

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Topography and vegetation structure mediate drought impacts on the understory of the South American Atlantic Forest

Cited by 15 publications

References 67 publications

Regional and local determinants of drought resilience in tropical forests

Regional and local determinants of drought resilience in tropical forests

Regional and local determinants of drought resilience in tropical forests

Assessing Environmental Criteria to Support Forest Connectivity

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