Flood and fire affect the soil seed bank of riparian forest in the Pantanal wetland

Kohagura, Thiago da Costa; Souza, Evaldo Benedito de; Bao, Francielli; Ferreira, Fernando Alves; Pott, Arnildo

doi:10.1590/2175-7860202071013

Cited by 10 publications

(4 citation statements)

References 37 publications

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“…43 species), at the end of the dry season and the end of annual floods (Bao et al, 2018b). The annual species that coexist in the field depend exclusively on seed banks (Bao et al, 2014, 2018a; Oliveira et al, 2015; Souza et al, 2016, 2021; Kohagura et al, 2020). We observed that the typical initial colonizers can alter their germination time when subjected to seed density‐dependent competitive interactions.…”

Section: Discussionmentioning

confidence: 99%

Do neighbours matter? The effect of single‐ and mixed‐species sowing density on seed germination of annual wetland plants

Bao

Rossatto

Pott

et al. 2021

Applied Vegetation Science

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Question: Germination is one of the decisive processes influencing species presence and plant community structure. Here, we investigated the influence of seed density and single and mixed species on germination percentage and timing using annual wetland plants of the Pantanal in Brazil.Location: Seeds were collected from annual species occupying a seasonally flooded grassland, at Fazenda São Bento (19°29′27,3″ S; 57°01′55,9″ W), in the Abobral subregion, Pantanal, Mato Grosso do Sul (Central-West Brazil).Methods: Experiments on the effects of seed density dependence on the germination time in intraspecific (single-species) and interspecific (mixed-species) treatments were conducted with ten annual species at three levels: for intraspecific -scarce (one seed), moderate (10 seeds), and high (20 seeds); and for interspecific -low (one each), medium (10) and abundant (20). Results:The germination percentage was independent of density and species mixtures. Germination time was density-dependent for the mixed-species treatment, but not the single-species treatments. Six species had a shorter germination time, suggesting a group priority effect. Other species delayed or did not alter their germination time, indicating that the response to intraspecific seed densities is species-specific. Conclusion:These findings illustrate that even though species have a history of coexistence and characteristics of rapid germination, seeds can alter germination time if they perceive neighbouring seeds of other species. Species that respond with a faster germination time may have a competitive advantage for recruitment and growth.These terrestrial species show high initial colonization power, which is essential in the regeneration of wetlands after flood disturbance.

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Section: Discussionmentioning

confidence: 99%

Do neighbours matter? The effect of single‐ and mixed‐species sowing density on seed germination of annual wetland plants

Bao

Rossatto

Pott

et al. 2021

Applied Vegetation Science

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“…It is the most used method by researchers in different wetlands (e.g. Bao et al 2014, Hazelton et al 2018, Kohagura et al 2020.…”

Section: Species Richness and Abundance In Different Methods Of Seed mentioning

confidence: 99%

Applicability of Seed Bank Assessment Methods in Wetlands: Advantages and Disadvantages

2021

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The soil seed bank is the primary source of regeneration in wetlands and has different assessment methods that vary according to the objective of the study. We evaluated the seed bank composition using three methods: seedlings emergence (EME), seedlings emergence with submersion trays in water (SUB) and screening and counting seeds (COU), and finally, we evaluated the applicability of COU to assess seed predation. The abundance and species richness were evaluated for two years at the end of the flood and dry seasons, in the Brazilian Pantanal. The abundance and species richness differed significantly between methods and seasons. The COU method showed the highest richness (84) and abundance (95.023) followed by EME and SUB. The SUB method reflected only the aquatic community. In the flood season, EME and COU methods showed similar species composition. There were no differences between COU and EME + SUB. The main advantage of COU method was the possibility to assess the seed predation, and we detected that Croton trinitatis had 32% of predated seeds. We consider that wetland ecosystems can be sampled by both methods COU and EME + SUB; however, the complete method that can be used for different purposes is COU, also, must be considered the infrastructure and objective of each study.

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“…C. trinitatis proved to be an ideal indicator species to study predatory effects. Most studies with seed banks show that the effects of seasonality are indicated as the main driver for structuring populations and communities (Bao et al 2014;Oliveira et al 2015;Souza et al 2016;Kohagura et al 2020). However, our results showed that probably predation is also a biotic filter of populations in this wetland.…”

Section: Seed Bank and Seed Predationmentioning

confidence: 99%

Abiotic drivers shape seed inputs and outputs in a tropical wetland on Croton trinitatis population

2022

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Background Predicting how natural and anthropogenic drivers shape different ecological indicators, such as plant populations along environmental gradients, can be a relevant tool for establishing management and conservation criteria of tropical wetlands. We aimed to assess the effects of seasonal flood disturbance, type of grasslands and topographical conditions on Croton trinitatis population distribution in a tropical wetland. Methods The study was carried out in a seasonally flooded grassland (Central-West Brazil). We conducted samplings of soil on the dry and flood hydrophases of the Pantanal. We took the samples in eight seasonal ponds, with 1 km interval between them. Transects were marked during the flood period, observing the water level, one in the lowest zone, in the middle of the pond = low (ca. 60 cm deep), one at the pond edge = mid (ca. 30 cm deep) and one in the higher zone, on the external part = high (ca. 1 cm deep). Results The results showed that the topography, seasonality, and types of grassland determine differences in the abundance patterns of adult plants and seedlings, and seed bank and seed predation. The abiotic factors can shape plant population-related ecological processes and patterns, with outputs (germination and predation) and inputs (local dispersion and from neighbouring areas) of proportional seeds for the population maintenance in this environment. Conclusion We emphasize the importance of these findings, to show that abiotic factors are not the only ones to be considered in ecological studies of distribution and structuring of populations in habitats with extreme seasonal events.

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Flood and fire affect the soil seed bank of riparian forest in the Pantanal wetland

Cited by 10 publications

References 37 publications

Do neighbours matter? The effect of single‐ and mixed‐species sowing density on seed germination of annual wetland plants

Do neighbours matter? The effect of single‐ and mixed‐species sowing density on seed germination of annual wetland plants

Applicability of Seed Bank Assessment Methods in Wetlands: Advantages and Disadvantages

Abiotic drivers shape seed inputs and outputs in a tropical wetland on Croton trinitatis population

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