Savanna trees do not have thicker outer bark than forest trees of two tropical species

Blagitz, Marcela; Machado, Sílvia Rodrigues; Marcati, Carmen Regina

doi:10.1016/j.flora.2018.12.003

Cited by 4 publications

(5 citation statements)

References 29 publications

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“…The fact that the species has morphophysiological adaptations to tolerate water stress conditions, poor soil (Blagitz et al, 2019) and germinates in low‐humidity conditions (J. W. F. Ribeiro & Kolb, 2016) can contribute to its colonization under these circumstances. Its dominance may be favored because these same factors, intrinsic to abandoned pastures (Fragoso et al, 2017), are environmental filters to the recruitment of other forest species (Nepstad et al, 1996; Guariguata & Ostertag, 2001; Meli et al, 2015; Arroyo‐Rodríguez et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

“…The fact that the species has morphophysiological adaptations to tolerate water stress conditions, poor soil (Blagitz et al, 2019) and germinates in low-humidity conditions (J. W. F. Ribeiro & Kolb, 2016) can contribute to its colonization under these circumstances.…”

Section: Discussionmentioning

confidence: 99%

“…Moquiniastrum polymorphum leaves contain potentially allelopathic phytotoxic substances (Pinto & Kolb, 2016) and have low susceptibility to herbivory (Pilon & Durigan, 2013). Its high‐density stem and thick bark (Figure 1c) promote water conservation during drought (Blagitz et al, 2019) and fire resistance (Brandes et al, 2019). It is intolerant to shaded environments, but tolerates infertile and degraded soils (Lorenzi, 1992).…”

Section: Methodsmentioning

confidence: 99%

“…Because forest loss can facilitate the dispersal of wind‐dispersed seeds across the opened landscape (Jesus et al, 2012; San‐José et al, 2020) and M . polymorphum tolerates water deficit and degraded soils ( Lorenzi, 1992; Carvalho, 2003; Blagitz et al, 2019), we hypothesized that: (1) the occurrence of its monodominant forest patches would be restricted to regions of optimum germination temperature and high past deforestation; and (2) higher dominance would be observed in sites with soil of low fertility and available water capacity over the biome. However, owing to the large scale of the study, it is not yet clear whether the observed patterns reflect a position of competitive advantage or simply tolerance to conditions that act as environmental filters for the majority of the local tree species (Sánchez‐Tapia et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Linking regeneration niche to monodominance in biodiverse tropical forest landscapes

Figueiredo

Sánchez‐Tapia

Siqueira

et al. 2022

J Vegetation Science

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Aims Although monodominance has attracted the attention of ecologists for many decades, few studies have devoted attention to how abiotic factors could influence the occurrence of monodominant forest patches at the biome scale. Here, we assessed whether the occurrence of monodominant forest patches of Moquiniastrum polymorphum (Less.) G. Sancho (Asteraceae), an early‐successional tree species with wind‐dispersed seeds, could be predicted using optimum germination temperature and past deforestation. We also verified under what edaphic and climatic conditions the species could reach monodominance. Location The Atlantic Forest, Brazil. Methods We estimated optimum germination temperature across the species’ geographic range as a function of annual mean temperature based on the results of germination tests available in the literature. Past deforestation (a proxy for suitable habitat for the species’ dispersal and establishment) around monodominant forest patches was estimated by calculating the forest cover in 1985. We also modeled the upper limit of dominance (relative abundance) as a function of climatic and edaphic variables considered important for the species’ establishment. Results The results showed that the probability of occurrence of monodominant forest patches is statistically null in places where germination can take more than 10 days and the landscape had more than 20% forest cover. Relative density values for the monodominant condition (> 60%) occurred only in warmer regions with infertile soils and median precipitation conditions (ca. 1,075–1,700 mm per year) in the Atlantic Forest. Conclusion We conclude that only under optimal conditions of germination and dispersal (i.e., regeneration niche) does monodominance occur. This highlights germination traits as an important mechanism for regulating monodominance. In addition, the approach used to predict regions with optimum germination temperature has further implications for understanding species abundance and distribution more generally.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Linking regeneration niche to monodominance in biodiverse tropical forest landscapes

Figueiredo

Sánchez‐Tapia

Siqueira

et al. 2022

J Vegetation Science

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“…For example, chloroplasts have been recorded in the secondary xylem rays or pith of small diameter stems at depths of 1500–5000 μm [ 6 , 34 , 42 , 43 , 44 , 46 , 48 , 49 ]. Far fewer studies have been made of larger diameter material ( Table 1 ), with most studies indicating that the chloroplasts were in a thin band, usually 100–350 μm in depth [ 14 , 39 , 41 , 45 , 50 ]. Pilarski and Tokarz [ 17 ] investigated chloroplast distribution in both small (7 mm) and large (60 cm) diameter stems of Fagus sylvatica .…”

Section: Discussionmentioning

confidence: 99%

Chloroplast Distribution in the Stems of 23 Eucalypt Species

Burrows

Connor

2020

Plants

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Small diameter branchlets and smooth barked stems and branches of most woody plants have chloroplasts. While the stems of several eucalypt species have been shown to photosynthesise, the distribution of chloroplasts has not been investigated in detail. The distribution of chloroplasts in branchlets (23 species) and larger diameter stems and branches with smooth bark (14 species) was investigated in a wide range of eucalypts (species of Angophora, Corymbia and Eucalyptus) using fresh hand sections and a combination of bright field and fluorescence microscopy. All species had abundant stem chloroplasts. In both small and large diameter stems, the greatest concentration of chloroplasts was in a narrow band (usually 100–300 μm thick) immediately beneath the epidermis or phellem. Deeper chloroplasts were present but at a lower density due to abundant fibres and sclereids. In general, chloroplasts were found at greater depths in small diameter stems, often being present in the secondary xylem rays and the pith. The cells of the chlorenchyma band were small, rounded and densely packed, and unlike leaf mesophyll. A high density of chloroplasts was found just beneath the phellem of large diameter stems. These trees gave no external indication that green tissues were present just below the phellem. In these species, a thick phellem was not present to protect the inner living bark. Along with the chlorenchyma, the outer bark also had a high density of fibres and sclereids. These sclerenchyma cells probably disrupted a greater abundance and a more organised arrangement of the cells containing chloroplasts. This shows a possible trade-off between photosynthesis and the typical bark functions of protection and mechanical strength.

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Fire and drought: Shifts in bark investment across a broad geographical scale for Neotropical savanna trees

Scalon

Rossatto

Oliveras

et al. 2021

Basic and Applied Ecology

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Savanna trees do not have thicker outer bark than forest trees of two tropical species

Cited by 4 publications

References 29 publications

Linking regeneration niche to monodominance in biodiverse tropical forest landscapes

Linking regeneration niche to monodominance in biodiverse tropical forest landscapes

Chloroplast Distribution in the Stems of 23 Eucalypt Species

Fire and drought: Shifts in bark investment across a broad geographical scale for Neotropical savanna trees

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