Macrophyte dynamics in an oxbow lake of the Sinos River basin in south Brazil

Schott, Patrícia; Rolon, Ana Silvia; Maltchik, Leonardo

doi:10.1080/03680770.2005.11902792

Cited by 5 publications

(9 citation statements)

References 8 publications

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“…In a shallow lake associated to the river floodplain, the stability of the macrophyte community was jeopardized after long-term floods (38 days), presenting alterations in both richness and total biomass of macrophytes . While short or very short-term floods (1 to 3 days) changed the biomass of the aquatic macrophyte assemblage, they did not modify the species richness (Schott et al, 2005;Maltchik et al, 2007).…”

Section: Diversity Of Aquatic Macrophytes In Wetlands 31 Of Southermentioning

confidence: 82%

“…The high dominance of grasses and sedges was also observed in rice fields of Sri Lanka (Bambaradenya et al, 2004). Furthermore, in the irrigation channels, hydrophytes (floating and submerged species) corresponded to 51% of all macrophyte species and emergent corresponded to (Maltchik et al, , 2007Schott et al, 2005). In general, the lower richness of aquatic macrophyte was associated to the period of occurrence of floods (Maltchik et al, , 2007Schott et al, 2005).…”

Section: Flood and Macrophyte Community Dynamics 33 In Natural Wetlmentioning

confidence: 96%

“…Furthermore, in the irrigation channels, hydrophytes (floating and submerged species) corresponded to 51% of all macrophyte species and emergent corresponded to (Maltchik et al, , 2007Schott et al, 2005). In general, the lower richness of aquatic macrophyte was associated to the period of occurrence of floods (Maltchik et al, , 2007Schott et al, 2005). According to Gopal and Junk (2000), the hydrological fluctuation contributes to a high biodiversity in floodplain systems.…”

Section: Flood and Macrophyte Community Dynamics 33 In Natural Wetlmentioning

confidence: 99%

“…While in some systems, the biomass was lower in flooded periods (Malchik et al, 2005); in others, the biomass was higher in the period without the presence of the surface water (Schott et al, 2005). According to Neiff (1975), while the peak of biomass of some macrophyte species occurs over the flood period, other species show high biomass values at low water level.…”

Section: Flood and Macrophyte Community Dynamics 33 In Natural Wetlmentioning

confidence: 99%

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Aquatic macrophytes in natural and managed wetlands of Rio Grande do Sul State, Southern Brazil

Rolon¹,

Homem²,

Maltchik³

2010

Acta

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Aim: This study gathers the main results obtained from studies regarding dynamic of aquatic macrophyte community in natural and managed wetlands of Southern Brazil. We analyzed the aquatic macrophytes diversity in wetlands of Southern Brazil, the environmental factors that determine the structure of the aquatic macrophyte community in fragmented wetlands, the effects of floods on the dynamics of macrophytes, and the contributions to the rice field for the conservation of aquatic macrophytes; Methods: The information was obtained from several researches carried in several spatial scales and different wetlands types over the last 10 years in Southern Brazil; Results: The studies have reported the occurrence of approximately 250 species of aquatic macrophytes. Wetland area, habitat diversity, altitude and hydroperiod were determinant for macrophyte richness and composition in wetlands of Southern Brazil. Furthermore, flood events, long or short-term ones, are strongly associated to the structure of the aquatic macrophyte community. The rice field systems of Southern Brazil (crops and irrigation channel) shelter a representative number of species of macrophyte found at natural wetlands in this region. The agricultural practices adopted over rice cultivation cycle in the rice fields have influenced the macrophyte richness and biomass. The different hydrological management practices adopted after the harvesting period (presence or lack of water surface) did not influence the macrophyte richness and biomass, however it influenced the species composition; Conclusions: The increasing process of wetland degradation (e.g. fragmentation, flood control and rice field expansion) presents a threat to the conservation aquatic macrophyte species.Keywords: aquatic plant, diversity, conservation, Neotropical region.Resumo: Objetivo: Este estudo reúne os principais resultados obtidos em trabalhos sobre a dinâmica da comunidade de macrófitas aquáticas em áreas úmidas naturais e manejadas do sul do Brasil. Nós analisamos a diversidade de macrófitas aquáticas do sul do Brasil, os fatores ambientais que determinam a estrutura da comunidade de macrófitas aquáticas nas áreas úmidas, o efeito das inundações na dinâmica da comunidade e a contribuição dos arrozais para a conservação das macrófitas aquáticas; Métodos: As informações foram obtidas de vários trabalhos realizados em diversas escalas espaciais e diferentes tipos de áreas úmidas ao longo dos últimos 10 anos no sul do Brasil; Resultados: Os estudos têm reportado a ocorrência de aproximadamente 250 espécies de macrófitas aquáticas. O tamanho da área úmida, diversidade de habitats, altitude e hidroperíodo foram determinantes para a riqueza e a composição de espécies em áreas úmidas do sul do Brasil. Além disso, os eventos de inundação, de longa ou curta duração, estão fortemente relacionados à estrutura da comunidade de macrófitas. Os sistemas orizícolas sul do Brasil (lavouras e canais de irrigação) abrigam um número representativo de espécies de macrófitas aquáticas enco...

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Section: Diversity Of Aquatic Macrophytes In Wetlands 31 Of Southermentioning

confidence: 82%

Section: Flood and Macrophyte Community Dynamics 33 In Natural Wetlmentioning

confidence: 96%

Section: Flood and Macrophyte Community Dynamics 33 In Natural Wetlmentioning

confidence: 99%

Section: Flood and Macrophyte Community Dynamics 33 In Natural Wetlmentioning

confidence: 99%

See 2 more Smart Citations

Aquatic macrophytes in natural and managed wetlands of Rio Grande do Sul State, Southern Brazil

Rolon¹,

Homem²,

Maltchik³

2010

Acta

Self Cite

View full text Add to dashboard Cite

show abstract

“…The hydrological fluctuation and hydroperiod are important attributes for macrophyte richness (Brose 2001;Schott et al 2005;Van Geest et al 2005 b;Maltchik et al 2007). The permanence of surface water was determinant for the species richness since the number of species in intermittent wetlands was less than in the permanent ones.…”

Section: Resultsmentioning

confidence: 99%

Influence of area, habitat and water chemistry on richness and composition of macrophyte assemblages in southern Brazilian wetlands

Rolon

Lacerda

Maltchik

et al. 2008

J Vegetation Science

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Questions: Two hypotheses were tested: (1) physical features, such as wetland surface area and habitat diversity, together with water chemistry, are important determinants of species richness and composition of macrophyte assemblages and (2) species richness and composition of macrophyte assemblages differ between wetlands of different types (i.e., palustrine versus lacustrine) and between wetlands of different hydrologies (i.e. permanent versus intermittent). Location: A subtropical coastal plain segment (2500 km2) of southern Brazil. Methods: Quarterly collections were carried out in 15 wetlands (2004–2005) in southern Brazil. Differences in richness over time were tested using repeated measures ANOVA. Stepwise multiple regression was performed to investigate relationships between total richness and environmental variables. Significance of differences between wetland types and hydroperiods on species composition was verified by MRPP (Multi‐Response Permutation Procedure). The influence of the environmental variables on species composition was assessed using CCA (Canonical Correspondence Analysis). Results: Macrophyte species richness changed with time, was not significantly different between wetland types, but was higher in permanent wetlands than in intermittent ones. Area, habitat diversity and soluble reactive phosphorus concentration explained 76% of the variation in species richness. Species composition was different between permanent and intermittent wetlands, although it was not significantly different between wetland types. Area, habitat diversity and water chemistry explained 50.1% of species composition. Conclusions: Species richness and composition of wetland macrophytes were mainly determined by area, habitat diversity and hydroperiod. These results can be used for the development of conservation and management programs in southern Brazil.

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Does the Lagoa do Peixe sandbar opening influence the macrophyte richness and composition in Southern Brazil wetlands?

Rolon

Maltchik

2013

RBT

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The Lagoa do Peixe has its connection with the sea artificially opened every year at the end of winter. However, this management has been carried out without the evaluation of the impact of this opening in the aquatic biodiversity. This information is crucial for the management of the natural resources of the Lagoa do Peixe National Park, the unique Ramsar site in Southern Brazil. The following questions were analyzed: (1) Do richness and composition of aquatic macrophytes from Lagoa do Peixe floodplain varies temporarily according to the sandbar opening and closing? (2) Does the variation pattern of the macrophyte community changed according to the sandbar opening and closing? A set of eight sampling sites of 1ha were selected over the Lagoa do Peixe floodplain: four sites not influenced by the artificial sandbar opening and four sites influenced by this event, being two sites closer to the sandbar opening and the two sites distant to the sandbar opening. The samplings were carried out between November 2007 and October 2009. The results show that although the artificial sandbar breaching does not affect the aquatic macrophyte richness at the floodplain, it affects the dynamics of species composition. The hydrological variation related to this management can be the main factor of the continuous change in the species composition in the floodplain, especially in the Southern portion. In order to avoid impacts in the macrophyte conservation, the artificial sandbar opening should be considered carefully, since the area of study is one of the most important conservation units to wetland systems in Southern Brazil.

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Macrophyte dynamics in an oxbow lake of the Sinos River basin in south Brazil

Cited by 5 publications

References 8 publications

Aquatic macrophytes in natural and managed wetlands of Rio Grande do Sul State, Southern Brazil

Aquatic macrophytes in natural and managed wetlands of Rio Grande do Sul State, Southern Brazil

Influence of area, habitat and water chemistry on richness and composition of macrophyte assemblages in southern Brazilian wetlands

Does the Lagoa do Peixe sandbar opening influence the macrophyte richness and composition in Southern Brazil wetlands?

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