Avaliação Da Associação Entre Espécies De Sub-Bosque E Variação Topográfica Em Um Fragmento De Floresta Atlântica

Hollunder, Renan Köpp; Martins, Karlo Gregório Guidoni; Luber, Jaquelini; Ferreira, Renzo Souza; Carrijo, Tatiana Tavares; Mendonça, Eduardo de Sá; Garbin, Mário Luís

doi:10.17648/uezo-ast-v2i2.75

Cited by 4 publications

(8 citation statements)

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“…Dominant species play an important role in structuring the species distributions (Wei et al, 2020 ) due to its homogenous pattern (Mariotte, 2014 ). For example, in a topographic gradient, they can occur in valleys and ridges (Hollunder et al, 2014 ). On the other hand, as low abundance species have a more aggregated spatial distribution (Garbin et al, 2016 ; Mariotte, 2014 ), it is expected that they occur in specific habitats and not across a whole topographic gradient (Hollunder et al, 2014 ).…”

Section: Biotic Factorsmentioning

confidence: 99%

“…For example, in a topographic gradient, they can occur in valleys and ridges (Hollunder et al, 2014 ). On the other hand, as low abundance species have a more aggregated spatial distribution (Garbin et al, 2016 ; Mariotte, 2014 ), it is expected that they occur in specific habitats and not across a whole topographic gradient (Hollunder et al, 2014 ). The response to drought depends on species and their spatial distribution and thus, taking into account topographical gradients (valleys, slopes, and ridges) and species groups (dominant vs. low abundance species) can improve our understanding of the processes that drive the response of tropical forests to severe droughts.…”

Section: Biotic Factorsmentioning

confidence: 99%

Section: Drought Resilience Of Dominant and Low Abundance Speciesmentioning

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: Biotic Factorsmentioning

confidence: 99%

Section: Biotic Factorsmentioning

confidence: 99%

See 1 more Smart Citation

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

“…Dominant species play an important role in structuring the species distributions (Wei et al 2020) due to its homogenous distribution pattern (Mariotte 2014). For example, in a topographic gradient, they can occur in valleys and ridges (Hollunder et al 2014). On the other hand, as low abundance species have a more aggregated spatial distribution (Mariotte 2014, Garbin et al 2016, it is expected that they occur in specific habitats and not across a whole topographic gradient (Hollunder et al 2014).…”

Section: Drought Resilience Of Dominant and Low Abundance Speciesmentioning

confidence: 99%

“…For example, in a topographic gradient, they can occur in valleys and ridges (Hollunder et al 2014). On the other hand, as low abundance species have a more aggregated spatial distribution (Mariotte 2014, Garbin et al 2016, it is expected that they occur in specific habitats and not across a whole topographic gradient (Hollunder et al 2014). The response to drought depends on species and their spatial distribution and thus, taking into account both habitats (valleys vs. ridges) and species groups (dominant vs. low abundance species) can improve our understanding of the processes that drive the response of tropical forests to severe droughts.…”

Section: Drought Resilience Of Dominant and Low Abundance Speciesmentioning

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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Vapor pressure deficit drives the mortality of understorey woody plants during drought recovery in the Atlantic Forest

Hollunder,

Garbin,

Scarano

et al. 2024

J Vegetation Science

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QuestionDrought‐induced tree mortality has been documented in forests worldwide but the mechanisms related to drought recovery are still poorly understood. To better predict forest trajectories under future climate scenarios, it is essential to disentangle physiological mechanisms underlying plant mortality caused by El Niño droughts. Here, we assessed how vegetation structure, vapor pressure deficit (VPD), and functional traits interact to mediate tree mortality after a severe drought in a tropical forest.LocationMata das Flores State Park, an Atlantic Forest fragment in southeast Brazil.MethodsWe established 20 permanent plots with contrasting vegetation structure and topography. In each plot, we measured tree abundance and diameter at breast height (DBH) of every woody plant (1–10 cm diameter) at the end of the drought, and two years after the break of drought, to calculate mortality rates during drought recovery. Hydraulic (e.g., maximum stomatal conductance to water vapor, stomatal density, etc.) and economic traits (specific leaf area, wood density, etc.) were measured on the 10 most abundant species. We also measured local air temperature and air humidity using HOBO dataloggers in each plot to calculate the VPD.ResultsThe studied Atlantic Forest understorey did not recover from the 2014–2016 drought, in terms of tree mortality. Lower VPD, driven by big trees in the valley, protected understorey plants with acquisitive economic attributes and conservative hydraulic attributes against mortality. On the other hand, higher VPD, driven by smaller trees and higher stem density on the ridge and slope, increased the mortality of understorey plants with acquisitive attributes.ConclusionRidges represent the most important fraction of the Atlantic Forest and our results suggest this type of forest is at high climate risk due to global change. Altogether, our results highlight that valleys are microclimate refuges for understorey plants and might help mitigate drought impacts in tropical forest under forecasted climate changes.

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Avaliação Da Associação Entre Espécies De Sub-Bosque E Variação Topográfica Em Um Fragmento De Floresta Atlântica

Cited by 4 publications

References 0 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

Vapor pressure deficit drives the mortality of understorey woody plants during drought recovery in the Atlantic Forest

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