Structure of aquatic vegetation of a large lake, western border of the Brazilian Pantanal

Cunha, Nicolay Leme da; Delatorre, Milena; Rodrigues, Rozângela Batista; Vidotto, C; Gonçalves, Fernando; Scremin-Dias, Edna; Damasceno‐Junior, Geraldo Alves; Pott, Vj.; Pott, Arnildo

doi:10.1590/s1519-69842012000300015

Cited by 17 publications

(11 citation statements)

References 34 publications

(64 reference statements)

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“…The ecological role of fire in SDTF, growing primarily to the west of LLG today, in the Chiquitanía region of eastern Bolivia, remains uncertain due to the paucity of suitable palaeo archives (lake and bog sediments) in this landscape. North and east of LLG are the Pantanal tropical wetlands, which are a mosaic landscape dominated by seasonally flooded savannas and riparian gallery forests, and shaped by regularly occurring floods and occasional wildfires [9,18,37].…”

Section: Results and Interpretationmentioning

confidence: 99%

Fire, climate and vegetation linkages in the Bolivian Chiquitano seasonally dry tropical forest

Power

Whitney

Mayle

et al. 2016

Phil. Trans. R. Soc. B

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One contribution of 24 to a discussion meeting issue 'The interaction of fire and mankind'. South American seasonally dry tropical forests (SDTFs) are critically endangered, with only a small proportion of their original distribution remaining. This paper presents a 12 000 year reconstruction of climate change, fire and vegetation dynamics in the Bolivian Chiquitano SDTF, based upon pollen and charcoal analysis, to examine the resilience of this ecosystem to drought and fire. Our analysis demonstrates a complex relationship between climate, fire and floristic composition over multi-millennial time scales, and reveals that moisture variability is the dominant control upon community turnover in this ecosystem. Maximum drought during the Early Holocene, consistent with regional drought reconstructions, correlates with a period of significant fire activity between 8000 and 7000 cal yr BP which resulted in a decrease in SDTF diversity. As fire activity declined but severe regional droughts persisted through the Middle Holocene, SDTFs, including Anadenanthera and Astronium, became firmly established in the Bolivian lowlands. The trend of decreasing fire activity during the last two millennia promotes the idea among forest ecologists that SDTFs are threatened by fire. Our analysis shows that the Chiquitano seasonally dry biome has been more resilient to Holocene changes in climate and fire regime than previously assumed, but raises questions over whether this resilience will continue in the future under increased temperatures and drought coupled with a higher frequency anthropogenic fire regime.This article is part of the themed issue 'The interaction of fire and mankind'.

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Section: Results and Interpretationmentioning

confidence: 99%

Fire, climate and vegetation linkages in the Bolivian Chiquitano seasonally dry tropical forest

Power

Whitney

Mayle

et al. 2016

Phil. Trans. R. Soc. B

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“…June-11 stages of succession (Pivari et al, 2008;Cunha et al, 2012). Most of them persisted after fire, with a relatively fast restart of succession, some of them from buried regenerative structures and others from soil seed bank.…”

Section: May-11mentioning

confidence: 99%

Effect of fire on a monodominant floating mat of Cyperus giganteus Vahl in a neotropical wetland

et al. 2015

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The rhizomatous Cyperus giganteus, abundant in the Pantanal wetland, can dominate extense floodable areas as monodominant communities. The Jacadigo lake has a large area of C. giganteus, where we performed an evaluation on community structure during two months in 2010, before it was hit by a wildfire which top-killed the vegetation, compared to ten months post-fire. We utilized 40 plots of 1m × 1m, along permanent trails, assessing two strata: the upper, near the inflorescence of adult plants, and the lower, close to the water level. Our results show that fire does not affect dominance of C. giganteus, as it maintained the same cover as before fire; species richness is not much altered either -28 before fire and 34 thereafter. Fire changed the floristic composition, due to the annual variation of species and the ability of some plants to colonize gaps and to regrow after fire from underground organs and seeds. The stratification of the vegetation with characteristic species of upper and lower strata was similar after fire.Keywords: Cyperaceae, floating meadow, diversity, Pantanal, plant succession. Efeito do fogo sobre uma comunidade monodominante de Cyperus giganteusVahl em uma área úmida neotropical ResumoA planta rizomatosa Cyperus giganteus, encontrada no Pantanal, pode dominar extensas áreas inundáveis, formando uma comunidade monodominante chamada localmente de pirizal. A lagoa do Jacadigo, situada na sub-região de Nabileque, possui uma extensa área de pirizal onde foi realizada uma avaliação na estrutura da vegetação durante dois meses no período de 2010, antes de ser atingida por um incêndio que causou perda da cobertura aérea da vegetação e foi comparada com 10 meses de avaliação pós-fogo. Com indicações na literatura de que o rizoma da planta pode favorecer a espécie através de rebrotamento após um incêndio, o objetivo deste trabalho foi avaliar as variações na estrutura da vegetação de pirizal após um evento de fogo. Foram utilizadas 40 parcelas não fixas de 1m × 1m e alocadas sistematicamente através de trilhas avaliando dois estratos: o superior, próximo a inflorescência dos adultos e o inferior, próximo a lâmina d'água. Nos dois meses logo após o fogo, devido ao tamanho reduzido nos indivíduos de C. giganteus foi avaliado apenas um estrato denominado total. Os resultados mostram que o fogo não afeta a dominância de C. giganteus, que se mantém na mesma faixa de cobertura do período anterior ao fogo; a riqueza de espécies não é alterada, 28 no período anterior ao fogo e 34 no período posterior. Após o incêndio, a estrutura da comunidade sofre alteração na composição florística, devido a mudança anual de espécies e a capacidade que certas plantas possuem em colonizar clareiras e rebrotar após o fogo por meio de órgãos subterrâneos e sementes. A estratificação da vegetação com espécies características de estrato superior e inferior se manteve após o fogo, porém com diferença menos acentuada entre as espécies.Palavras-chave: Cyperaceae, baceiro, diversidade, Pantanal, sucessão vegetal.

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“…At the generic level, species richness varies among studies. Besides the common predominance of some genera of Cyperaceae (Cyperus, Eleocharis and Rhynchospora) (Lima et al 2011, Meyer & Franceschinelli 2011, Rocha et al 2015, several reports showed an elevated species richness of Ludwigia (Onagraceae) (Pivari et al 2011, Cunha et al 2012. Ludwigia is among the most represented genera of aquatic plants in the Pantanal (Pott et al 2011) and was also cited by Pivari et al (2008) as the most representative genus for floating meadows in the Pantanal in the sub-regions of Abobral and Miranda.…”

Section: Discussionmentioning

confidence: 99%

Aquatic Vegetation of Nearshore and Floating Meadow of a Large Oxbow Lake in the Brazilian Pantanal

et al. 2019

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The objective of this study was to characterize the floristic and phytosociological composition of aquatic macrophytes occurring on the nearshore and on floating meadows of a large oxbow lake in the Pantanal wetland, in order to identify the degree of similarity between these biological compartments. Therefore, we sampled 100 plots of 0.5 x 0.5 m on floating meadows and 100 nearshore. We recorded 42 species, being 30 nearshore and 38 on floating meadows. The richness observed on floating meadows was little superior to the recorded nearshore, and the similarity between the compartments was relatively high (Jaccard = 61.90). Four species occurred exclusively nearshore, while 12 species were restricted to floating meadows. The outstanding species for their frequency and a high percentage of cover nearshore were Ludwigia helminthorrhiza (Mart.) H.Hara and Eichhornia azurea (Sw.) Kunth. On floating meadows, Cyperus blepharoleptos Steud. presented the highest importance value (61.3). The emergent and amphibious life forms were the most common in both compartments. The similarity between both formations is an expected outcome, once the floating meadows can develop from nearshore plants and contact them during displacements within the lake. We highlight the high number of exclusive species recorded on floating meadows, which can be explained by environmental (related to the interaction between species and environmental characteristics) or spatial factors (dispersal capacity) that favor the colonization of the floating meadows by species absent nearshore.

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Structure of aquatic vegetation of a large lake, western border of the Brazilian Pantanal

Cited by 17 publications

References 34 publications

Fire, climate and vegetation linkages in the Bolivian Chiquitano seasonally dry tropical forest

Fire, climate and vegetation linkages in the Bolivian Chiquitano seasonally dry tropical forest

Effect of fire on a monodominant floating mat of Cyperus giganteus Vahl in a neotropical wetland

Aquatic Vegetation of Nearshore and Floating Meadow of a Large Oxbow Lake in the Brazilian Pantanal

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