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  1. Article ; Online: Warming and shifts in litter quality drive multiple responses in freshwater detritivore communities.

    Benavides-Gordillo, Sandra / González, Angélica L / Kersch-Becker, Mônica F / Moretti, Marcelo S / Moi, Dieison A / Aidar, Marcos P M / Romero, Gustavo Q

    Scientific reports

    2024  Volume 14, Issue 1, Page(s) 11137

    Abstract: Aquatic detritivores are highly sensitive to changes in temperature and leaf litter quality caused by increases in atmospheric ... ...

    Abstract Aquatic detritivores are highly sensitive to changes in temperature and leaf litter quality caused by increases in atmospheric CO
    MeSH term(s) Animals ; Fresh Water ; Plant Leaves ; Climate Change ; Ecosystem ; Temperature ; Carbon Dioxide/metabolism
    Language English
    Publishing date 2024-05-15
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-024-61624-z
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Photosynthetic activity increases with leaf size and intercellular spaces in an allomorphic lianescent aroid Rhodospatha oblongata.

    Mantuano, Dulce / Ornellas, Thales / Aidar, Marcos P M / Mantovani, André

    Functional plant biology : FPB

    2021  Volume 48, Issue 6, Page(s) 557–566

    Abstract: This study aimed to investigate leaf anatomy, as well as photosynthetic gas exchange, that underlie the improvement in light foraging capacity, which appears to occur in aroid vines seeking light exposure. Three levels of plant height (soil level, 3 m ... ...

    Abstract This study aimed to investigate leaf anatomy, as well as photosynthetic gas exchange, that underlie the improvement in light foraging capacity, which appears to occur in aroid vines seeking light exposure. Three levels of plant height (soil level, 3 m and 6 m) were categorised for the aroid vine Rhodospatha oblongata Poepp. to represent the transition from ground to canopy. Compared with shaded leaves, leaves exposed to high light conditions were thicker, presenting a larger, spongy parenchyma characterised by a larger transversal area of intercellular spaces. In addition to the increase in maximum CO2 assimilation (Amax) and thicker and larger leaf lamina, we found an increased light saturation point, light compensation point and water use efficiency at 500 µmol PPFD. Nitrogen content per leaf dry mass remained constant across habitats, but Amax/N was 1.5-times greater in the canopy position than in the leaves at soil level, suggesting that CO2 gain did not rely on an N-related biochemical apparatus. The lower δ13C discrimination observed at high canopy leaves corroborated the higher photosynthesis. Altogether, these results suggest that the large and exposed aroid leaves maintained carbon gain coupled with light gain through investing in a more efficient proportion of intercellular spaces and photosynthetic cell surface, which likely allowed a less pronounced CO2 gradient in substomatal-intercellular space.
    MeSH term(s) Araceae ; Extracellular Space ; Nitrogen ; Photosynthesis ; Plant Leaves
    Chemical Substances Nitrogen (N762921K75)
    Language English
    Publishing date 2021-02-08
    Publishing country Australia
    Document type Journal Article
    ZDB-ID 2071582-1
    ISSN 1445-4416 ; 1445-4408
    ISSN (online) 1445-4416
    ISSN 1445-4408
    DOI 10.1071/FP20215
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Photosynthetic activity increases with leaf size and intercellular spaces in an allomorphic lianescent aroid Rhodospatha oblongata

    Mantuano, Dulce / Ornellas, Thales / Aidar, Marcos P. M / Mantovani, André

    Functional plant biology. 2021, v. 48, no. 6

    2021  

    Abstract: This study aimed to investigate leaf anatomy, as well as photosynthetic gas exchange, that underlie the improvement in light foraging capacity, which appears to occur in aroid vines seeking light exposure. Three levels of plant height (soil level, 3 m ... ...

    Abstract This study aimed to investigate leaf anatomy, as well as photosynthetic gas exchange, that underlie the improvement in light foraging capacity, which appears to occur in aroid vines seeking light exposure. Three levels of plant height (soil level, 3 m and 6 m) were categorised for the aroid vine Rhodospatha oblongata Poepp. to represent the transition from ground to canopy. Compared with shaded leaves, leaves exposed to high light conditions were thicker, presenting a larger, spongy parenchyma characterised by a larger transversal area of intercellular spaces. In addition to the increase in maximum CO2 assimilation (Amax) and thicker and larger leaf lamina, we found an increased light saturation point, light compensation point and water use efficiency at 500 µmol PPFD. Nitrogen content per leaf dry mass remained constant across habitats, but Amax/N was 1.5-times greater in the canopy position than in the leaves at soil level, suggesting that CO2 gain did not rely on an N-related biochemical apparatus. The lower δ13C discrimination observed at high canopy leaves corroborated the higher photosynthesis. Altogether, these results suggest that the large and exposed aroid leaves maintained carbon gain coupled with light gain through investing in a more efficient proportion of intercellular spaces and photosynthetic cell surface, which likely allowed a less pronounced CO2 gradient in substomatal-intercellular space.
    Keywords canopy ; carbon ; gas exchange ; leaf anatomy ; leaf area ; leaf dry mass ; nitrogen content ; photosynthesis ; plant height ; soil ; vines ; water use efficiency
    Language English
    Size p. 557-566.
    Publishing place CSIRO Publishing
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 2071582-1
    ISSN 1445-4408
    ISSN 1445-4408
    DOI 10.1071/FP20215
    Database NAL-Catalogue (AGRICOLA)

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  4. Article ; Online: Functional traits and symbiotic associations of geoxyles and trees explain the dominance of detarioid legumes in miombo ecosystems.

    Gomes, Amândio L / Revermann, Rasmus / Meller, Paulina / Gonçalves, Francisco M P / Aidar, Marcos P M / Lages, Fernanda / Finckh, Manfred

    The New phytologist

    2021  Volume 230, Issue 2, Page(s) 510–520

    Abstract: The miombo region in Africa is covered by a mosaic of woodlands and geoxylic grasslands and is subject to disturbances such as fires, frost and drought, and low nutrient availability. The dominance of Fabaceae Detarioideae species in miombo ecosystems is ...

    Abstract The miombo region in Africa is covered by a mosaic of woodlands and geoxylic grasslands and is subject to disturbances such as fires, frost and drought, and low nutrient availability. The dominance of Fabaceae Detarioideae species in miombo ecosystems is remarkable but little understood. We therefore compared plant functional traits (PFTs) of common woody species of the Angolan plateau, grouped by life form (trees, geoxyles), lineage (Fabaceae: Detarioideae, non-Detarioideae) and symbiont association (ectomycorrhiza, rhizobia). PFTs reflect group-specific adaptations to prevalent environmental conditions. To analyse the impact of environmental drivers, we selected PFTs reflecting ecophysiological aspects of leaf morphology, nutrient content and water transport. Traits were measured following standardized protocols. We found differences in key PFTs between trees and geoxyles reflecting both life form-specific adaptations to environmental conditions and lineage-specific strategies to cope with environmental stresses. We interpret higher leaf thickness and higher wood density of geoxyles as responses to harsher open environments. Fabaceae in general and ectomycorrhizal species showed better nutrient status. Symbiotic associations of detarioid legumes with ectomycorrhiza show specific advantages for phosphorous uptake as compared to Rhizobia-associated Fabaceae and to non-Fabaceae and thus may be crucial for the stunning dominance of Detarioideae in miombo landscapes.
    MeSH term(s) Africa ; Ecosystem ; Fabaceae ; Forests ; Trees
    Language English
    Publishing date 2021-02-21
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1111/nph.17168
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Climate refugees going underground - a response to Maurin et al. (2014).

    Finckh, Manfred / Revermann, Rasmus / Aidar, Marcos P M

    The New phytologist

    2016  Volume 209, Issue 3, Page(s) 904–909

    MeSH term(s) Climate ; Ecosystem ; Fires ; Refugees ; Trees
    Language English
    Publishing date 2016-01-12
    Publishing country England
    Document type Letter ; Research Support, Non-U.S. Gov't ; Comment
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1111/nph.13567
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Functional traits and symbiotic associations of geoxyles and trees explain the dominance of detarioid legumes in miombo ecosystems

    Gomes, Amândio L / Revermann, Rasmus / Meller, Paulina / Gonçalves, Francisco M. P / Aidar, Marcos P. M / Lages, Fernanda / Finckh, Manfred

    new phytologist. 2021 Apr., v. 230, no. 2

    2021  

    Abstract: The miombo region in Africa is covered by a mosaic of woodlands and geoxylic grasslands and is subject to disturbances such as fires, frost and drought, and low nutrient availability. The dominance of Fabaceae Detarioideae species in miombo ecosystems is ...

    Abstract The miombo region in Africa is covered by a mosaic of woodlands and geoxylic grasslands and is subject to disturbances such as fires, frost and drought, and low nutrient availability. The dominance of Fabaceae Detarioideae species in miombo ecosystems is remarkable but little understood. We therefore compared plant functional traits (PFTs) of common woody species of the Angolan plateau, grouped by life form (trees, geoxyles), lineage (Fabaceae: Detarioideae, non‐Detarioideae) and symbiont association (ectomycorrhiza, rhizobia). PFTs reflect group‐specific adaptations to prevalent environmental conditions. To analyse the impact of environmental drivers, we selected PFTs reflecting ecophysiological aspects of leaf morphology, nutrient content and water transport. Traits were measured following standardized protocols. We found differences in key PFTs between trees and geoxyles reflecting both life form‐specific adaptations to environmental conditions and lineage‐specific strategies to cope with environmental stresses. We interpret higher leaf thickness and higher wood density of geoxyles as responses to harsher open environments. Fabaceae in general and ectomycorrhizal species showed better nutrient status. Symbiotic associations of detarioid legumes with ectomycorrhiza show specific advantages for phosphorous uptake as compared to Rhizobia‐associated Fabaceae and to non‐Fabaceae and thus may be crucial for the stunning dominance of Detarioideae in miombo landscapes.
    Keywords drought ; ecophysiology ; ectomycorrhizae ; frost ; leaf morphology ; leaf thickness ; nutrient availability ; nutrient content ; phosphorus ; symbionts ; wood density ; woody plants ; Africa
    Language English
    Dates of publication 2021-04
    Size p. 510-520.
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note NAL-AP-2-clean ; JOURNAL ARTICLE
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1111/nph.17168
    Database NAL-Catalogue (AGRICOLA)

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  7. Article: Phosphorus rather than nitrogen enhances CO2 emissions in tropical forest soils: Evidence from a laboratory incubation study

    Hui, Dafeng / Porter, Wesley / Phillips, Jana R / Aidar, Marcos P.M / Lebreux, Steven J / Schadt, Christopher W / Mayes, Melanie A

    European journal of soil science. 2020 May, v. 71, no. 3

    2020  

    Abstract: Ecosystem functional responses such as soil CO₂ emissions are constrained by microclimate, available carbon (C) substrates and their effects upon microbial activity. In tropical forests, phosphorus (P) is often considered as a limiting factor for plant ... ...

    Abstract Ecosystem functional responses such as soil CO₂ emissions are constrained by microclimate, available carbon (C) substrates and their effects upon microbial activity. In tropical forests, phosphorus (P) is often considered as a limiting factor for plant growth, but it is still not clear whether P constrains microbial CO₂ emissions from soils. In this study, we incubated seven tropical forest soils from Brazil and Puerto Rico with different nutrient addition treatments (no addition, Control; C, nitrogen (N) or P addition only; and combined C, N and P addition (CNP)). Cumulative soil CO₂ emissions were fit with a Gompertz model to estimate potential maximum cumulative soil CO₂ emission (C ₘ) and the rate of change of soil C decomposition (k). Quantitative polymerase chain reaction (qPCR) was conducted to quantify microbial biomass as bacteria and fungi. Results showed that P addition alone or in combination with C and N enhanced C ₘ, whereas N addition usually reduced C ₘ, and neither N nor P affected microbial biomass. Additions of CNP enhanced k, increased microbial abundances and altered fungal to bacterial ratios towards higher fungal abundance. Additions of CNP, however, tended to reduce C ₘ for most soils when compared to C additions alone, suggesting that microbial growth associated with nutrient additions may have occurred at the expense of C decomposition. Overall, this study demonstrates that soil CO₂ emission is more limited by P than N in tropical forest soils and those effects were stronger in soils low in P. HIGHLIGHTS: A laboratory incubation study was conducted with nitrogen, phosphorus or carbon addition to tropical forest soils. Soil CO₂ emission was fitted with a Gompertz model and soil microbial abundance was quantified using qPCR. Phosphorus addition increased model parameters C ₘ and soil CO₂ emission, particularly in the Puerto Rico soils. Soil CO₂ emission was more limited by phosphorus than nitrogen in tropical forest soils.
    Keywords carbon ; carbon dioxide ; ecosystems ; fungi ; logit analysis ; microbial biomass ; microbial growth ; microclimate ; nitrogen ; phosphorus ; plant growth ; quantitative polymerase chain reaction ; tropical forests ; Brazil ; Puerto Rico
    Language English
    Dates of publication 2020-05
    Size p. 495-510.
    Publishing place Blackwell Publishing Ltd
    Document type Article
    Note NAL-AP-2-clean ; JOURNAL ARTICLE
    ZDB-ID 1191614-x
    ISSN 1365-2389 ; 1351-0754
    ISSN (online) 1365-2389
    ISSN 1351-0754
    DOI 10.1111/ejss.12885
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  8. Article: What does the RuBisCO activity tell us about a C3-CAM plant?

    Gonçalves, Ana Z / Latansio, Sabrina / Detmann, Kelly C / Marabesi, Mauro A / Neto, Antônio A.C / Aidar, Marcos P.M / DaMatta, Fábio M / Mercier, Helenice

    Plant physiology and biochemistry. 2020 Feb., v. 147

    2020  

    Abstract: Plants that perform the Crassulacean acid metabolism (CAM), which obtain CO2 overnight and convert it mainly in malic acid, successfully grow in environments with water and nutrient shortages, that is partly associated with their higher water- and ... ...

    Abstract Plants that perform the Crassulacean acid metabolism (CAM), which obtain CO2 overnight and convert it mainly in malic acid, successfully grow in environments with water and nutrient shortages, that is partly associated with their higher water- and nitrogen-use efficiencies. Water and nutrient limitations can impair photosynthesis through the reduction of RuBisCO and increment of photorespiration, disturbing the plant carbon balance. In this context, we conducted a controlled experiment with the epiphytic C3-CAM bromeliad Guzmania monostachia to investigate how the combined water and nutritional deficits affect the activity of RuBisCO and its activation state (RAS), and to evaluate the efficiency of photosynthesis during the transition from C3 to CAM. Apart from an increase in CAM activity, bromeliads submitted to both water and nutritional deficits showed higher RAS values and unaltered RuBisCO activity compared to C3 bromeliads and, surprisingly, the maximum quantum efficiency of photosynthesis increased. Glucose, fructose and starch levels were maintained, while sucrose concentrations increased over time. These results, combined with the high RAS values, suggest an increased efficiency of RuBisCO functioning. Our results reinforce the ability of epiphytic bromeliads to deal with stressful habitats by a higher efficiency of RuBisCO during the transition to CAM, another feature that may allow their evolution in the epiphytic environment.
    Keywords Crassulacean acid metabolism ; Guzmania ; carbon ; carbon dioxide ; enzyme activity ; epiphytes ; evolution ; fructose ; glucose ; habitats ; malic acid ; nutrient use efficiency ; photorespiration ; ribulose-bisphosphate carboxylase ; starch ; sucrose ; water use efficiency
    Language English
    Dates of publication 2020-02
    Size p. 172-180.
    Publishing place Elsevier Masson SAS
    Document type Article
    ZDB-ID 742978-2
    ISSN 1873-2690 ; 0981-9428
    ISSN (online) 1873-2690
    ISSN 0981-9428
    DOI 10.1016/j.plaphy.2019.12.020
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  9. Article ; Online: Mapping Atlantic rainforest degradation and regeneration history with indicator species using convolutional network.

    Wagner, Fabien H / Sanchez, Alber / Aidar, Marcos P M / Rochelle, André L C / Tarabalka, Yuliya / Fonseca, Marisa G / Phillips, Oliver L / Gloor, Emanuel / Aragão, Luiz E O C

    PloS one

    2020  Volume 15, Issue 2, Page(s) e0229448

    Abstract: The Atlantic rainforest of Brazil is one of the global terrestrial hotspots of biodiversity. Despite having undergone large scale deforestation, forest cover has shown signs of increases in the last decades. Here, to understand the degradation and ... ...

    Abstract The Atlantic rainforest of Brazil is one of the global terrestrial hotspots of biodiversity. Despite having undergone large scale deforestation, forest cover has shown signs of increases in the last decades. Here, to understand the degradation and regeneration history of Atlantic rainforest remnants near São Paulo, we combine a unique dataset of very high resolution images from Worldview-2 and Worldview-3 (0.5 and 0.3m spatial resolution, respectively), georeferenced aerial photographs from 1962 and use a deep learning method called U-net to map (i) the forest cover and changes and (ii) two pioneer tree species, Cecropia hololeuca and Tibouchina pulchra. For Tibouchina pulchra, all the individuals were mapped in February, when the trees undergo mass-flowering with purple and pink blossoms. Additionally, elevation data at 30m spatial resolution from NASA Shuttle Radar Topography Mission (SRTM) and annual mean climate variables (Terraclimate datasets at ∼ 4km of spatial resolution) were used to analyse the forest and species distributions. We found that natural forests are currently more frequently found on south-facing slopes, likely because of geomorphology and past land use, and that Tibouchina is restricted to the wetter part of the region (southern part), which annually receives at least 1600 mm of precipitation. Tibouchina pulchra was found to clearly indicate forest regeneration as almost all individuals were found within or adjacent to forests regrown after 1962. By contrast, Cecropia hololeuca was found to indicate older disturbed forests, with all individuals almost exclusively found in forest fragments already present in 1962. At the regional scale, using the dominance maps of both species, we show that at least 4.3% of the current region's natural forests have regrown after 1962 (Tibouchina dominated, ∼ 4757 ha) and that ∼ 9% of the old natural forests have experienced significant disturbance (Cecropia dominated).
    MeSH term(s) Biodiversity ; Conservation of Natural Resources ; Environmental Monitoring ; Neural Networks, Computer ; Rainforest ; Species Specificity ; Trees/classification ; Trees/growth & development
    Language English
    Publishing date 2020-02-28
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2267670-3
    ISSN 1932-6203 ; 1932-6203
    ISSN (online) 1932-6203
    ISSN 1932-6203
    DOI 10.1371/journal.pone.0229448
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  10. Article ; Online: The contribution of weak CAM to the photosynthetic metabolic activities of a bromeliad species under water deficit.

    Pikart, Filipe C / Marabesi, Mauro A / Mioto, Paulo T / Gonçalves, Ana Z / Matiz, Alejandra / Alves, Frederico R R / Mercier, Helenice / Aidar, Marcos P M

    Plant physiology and biochemistry : PPB

    2017  Volume 123, Page(s) 297–303

    Abstract: The Crassulacean acid metabolism (CAM) can be a transitory strategy for saving water during unfavourable conditions, like a dry season. In some cases, CAM can also contribute to the maintenance of photosynthetic integrity, even if carbon gain and growth ... ...

    Abstract The Crassulacean acid metabolism (CAM) can be a transitory strategy for saving water during unfavourable conditions, like a dry season. In some cases, CAM can also contribute to the maintenance of photosynthetic integrity, even if carbon gain and growth are impaired. CAM occurs in different intensities, being stronger or weaker depending on the degree of nocturnal malic acid accumulation. For example, Guzmania monostachia is an epiphytic tank bromeliad that shows an increase in its nocturnal organic acid accumulation and a variable CAM behaviour when exposed to water deficit. In this context, this study aimed at investigating whether the weak CAM displayed by this species may mitigate the harmful effects of water limitation on its photosynthetic activity. To this, bromeliads were submitted to well-watered and water deficit conditions. Guzmania monostachia plants under water deficiency conditions showed a reduction on atmospheric carbon assimilation without exhibiting changes in PSII integrity and carbohydrate production while showed an increase in nocturnal malic acid accumulation. Additionally, spots with high PSII efficiency in the leaf portion with a greater nocturnal malic acid accumulation were observed in plants exposed to water shortage conditions. These high-efficiency spots might be associated with a greater malate decarboxylation capacity. Also, the malic acid contributed to approximately 50% of the total carbon assimilated under water deficit. These results suggest that weak CAM may participate in photo-protection and it appears to meaningfully contribute to the overall carbon balance, being an important metabolic strategy to maintain plant fitness during water deficit periods.
    MeSH term(s) Bromeliaceae/metabolism ; Dehydration/metabolism ; Malates/metabolism ; Photosynthesis ; Photosystem II Protein Complex/metabolism ; Stress, Physiological
    Chemical Substances Malates ; Photosystem II Protein Complex ; malic acid (817L1N4CKP)
    Language English
    Publishing date 2017-12-19
    Publishing country France
    Document type Journal Article
    ZDB-ID 742978-2
    ISSN 1873-2690 ; 0981-9428
    ISSN (online) 1873-2690
    ISSN 0981-9428
    DOI 10.1016/j.plaphy.2017.12.030
    Database MEDical Literature Analysis and Retrieval System OnLINE

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