Dinâmica do componente arbóreo de uma mata de galeria inundável (Brasília, Distrito Federal) em um período de oito anos

Abstract

-(Dynamics of the arboreal component in a swamp gallery forest (Brasília, Federal District) over an eight year period). Gallery forests play an important role in supporting the water resources and biodiversity of the Brazilian Central Plateau, but they have been under strong anthropic impact. those that occur in poorly drained soils are little studied, with negative consequences for their conservation. The aim of this work was to evaluate the floristic and structural dynamics of a swamp gallery forest fragment at Fazenda sucupira (15°54'22" s; 48°00'34" W), Brasília, Federal District, over an eight year period (2000 to 2008). two measurements were carried out in 40 plots (0.8 ha) of 20 × 10 m. all individuals with DaP ≥ 3.0 cm were recorded. The first measurement registered 3,048 individuals, distributed in 50 species, 41 genera (32 families). In the second measurement 2,728 individuals were found, belonging to 59 species, 48 genera (36 families). in 2008 there was a reduction of 320 individuals but an addition of 9 species, 7 genera and 4 families. the monitoring period showed high rates of mortality (4.25% year -1 ) and recruitment (3.67% year -1 ), changes in the importance of many species, without significant modification of the diversity index: H' = 2.84 nats ind. -1 , J' = 0.73 in 2000 and H' = 3.02 nats ind. -1 , J' = 0.74 in 2008. this unique type of gallery forest seems to be dynamic in its floristic community, without detectable effects on structure and diversity. More studies focused on community dynamic, for longer periods are still needed for a better understanding of the swamp forest environment in Central Brazil, and to generate information for conservation action plans.Key words -Cerrado, flood, riparian forest, swamp forest, tree community RESUMO -(Dinâmica do componente arbóreo de uma mata de galeria inundável (Brasília, Distrito Federal) em um período de oito anos). as matas de galeria são importantes na manutenção dos recursos hídricos e da biodiversidade do Planalto Central, mas estão submetidas a fortes impactos antrópicos. aquelas que ocorrem em solos mal drenados são pouquíssimo estudadas, com consequências negativas sobre sua conservação. Este trabalho objetivou avaliar a dinâmica florística e estrutural de um trecho de mata de galeria inundável na Fazenda sucupira (15°54'22" s; 48°00'34" W), Brasília, Distrito Federal, em um período de oito anos (2000 a 2008). nas duas medições realizadas, em 40 parcelas (0,8 ha) de 20 × 10 m, foram amostrados todos os indivíduos arbóreos com DaP ≥ 3,0 cm. a primeira medição registrou 3.048 indivíduos, distribuídos em 50 espécies e 41 gêneros (32 famílias). na segunda medição foram encontrados 2.728 indivíduos, pertencentes a 59 espécies e 48 gêneros (36 famílias). Em 2008 verificou-se diminuição de 320 indivíduos, mas acréscimo de 9 espécies, 7 gêneros e 4 famílias. O período monitorado revelou altas taxas de mortalidade (4,25% ano -1 ) e recrutamento (3,67% ano -1 ), mudanças consideráveis na importância de muitas espécies, sem alterações si...

Evolution of seed dispersal in the Cerrado biome: ecological and phylogenetic considerations

“…In addition, this can be also confirmed if analyzing phytosociological studies in Cerrado (Pinheiro & Ribeiro 2001;Fonseca & Silva Junior 2004;Fontes & Walter 2011), in which was observed that areas with low floristic similarity between them, but with the same structure of vegetation, were quite similar in terms of dispersal strategies, both for the number of species and the number of individuals of each syndrome. Thus, it is expected that even distant communities with high floristic differences may be quite similar for functional ecological processes, as in the case of dispersal strategies, since they are similar regarding the structure of the vegetation (May & Seger 1986).…”

<b>Composition and structure of the gallery forest in the Taquaruçu GrandeSub-basin, Municipality of Palmas, Tocantins State

“…This is because this area holds a greater abundance of water, where at certain times of year, emerge floodable areas, showing the existence of environmental conditions favorable to its establishment as found by Guilherme and Nakajima (2007) in Sabiá Park in Uberlândia, Minas Gerais State, and in the Onça Stream (Fontes & Walter, 2011) in Brasília, and by Lopes and Schiavini (2007) in the Panga Stream, in Minas Gerais State, significantly contributing to the biomass in the region.…”

Species Turnover across Different Life Stages from Seedlings to Canopy Trees in Swamp Forests of Central Brazil

“…Thus, local patchy disturbances promote environmental heterogeneity allowing coexistence of competing species by increasing niche dimensionality within local communities. Since swamp gallery forests seem to be very dynamic with high rates of mortality and recruitment due to tree fall events [4,10,18], natural disturbances might play a central role in promoting species turnover in this habitat.…”

“…Among different habitat types found in Central Brazil, swamp gallery forests locally known as matas paludosas, matas de galeria inundáveis, and matas de brejo, are very peculiar and occur in permanently flooded soils [1][2][3][4][5]. These environments are considered important to the speciation of tropical plant lineages and contributed to the diversity of species in the Cerrado biome [6,7].…”