scholarly journals Floristic composition, structure and tree diversity of an amazon forest in Peru

2021 ◽  
Vol 12 (1) ◽  
pp. 73-82
Author(s):  
Carlos E. Alvarez-Montalván ◽  
Saúl Manrique-León ◽  
Mauro Vela-Da Fonseca ◽  
Jorge Cardozo-Soarez ◽  
Julio Callo-Ccorcca ◽  
...  
Keyword(s):  
Floristic Composition ◽  
Tree Diversity ◽  
Amazon Forest ◽  
Composition Structure

The demography of a dominant Amazon liana species exhibits little environmental sensitivity

2015 ◽  
Vol 32 (1) ◽  
pp. 79-82 ◽  
Author(s):  
Luciana de Campos Franci ◽  
Jens-Christian Svenning ◽  
Henrik Balslev ◽  
Fernando Roberto Martins ◽  
Jacob Nabe-Nielsen
Keyword(s):  
Dominant Species ◽  
Environmental Gradients ◽  
Floristic Composition ◽  
Environmental Variation ◽  
Common Species ◽  
Amazon Forest ◽  
Vegetation Density ◽  
Vital Rates ◽  
Relative Growth ◽  
Positive Effect

Abstract:Despite its high plant diversity, the Amazon forest is dominated by a limited number of highly abundant, oligarchic tree and liana species. The high diversity can be related to specific habitat requirements in many of the less common species, but fewer studies have investigated the characteristics of the dominant species. To test how environmental variation may contribute to the success of dominant species we investigated whether the vital rates of the abundant liana Machaerium cuspidatum is sensitive to canopy height, topographic steepness, vegetation density, soil components and floristic composition across an Ecuadorian Amazon forest. The population was inventoried in 1998 and in 2009. Plants were divided into seedling-sized individuals, non-climbers and climbers. Out of 448 seedling-sized plants 421 died, 539 of 732 non-climbers died, and 107 of 198 climbers died. There was weak positive effect of dense understorey on the relative growth rate of climbers. The mortality of seedling-sized plants was higher in areas with intermediate slope, but for larger plants mortality was not related to environmental variation. The limited sensitivity of the vital rates to environmental gradients in the area suggests that ecological generalism contributes to the success of this dominant Amazonian liana.

scholarly journals Spatial distribution of mangrove species and their association with the substrate sediment types, estuarine sector Térraba-Sierpe National Wetlands, Costa Rica

2016 ◽  
pp. 47-60
Author(s):  
Raquel Marcela Barrantes Leiva ◽  
Alexis Cerdas Salas
Keyword(s):  
Spatial Distribution ◽  
Continuous Distribution ◽  
Floristic Composition ◽  
Sediment Type ◽  
Mangrove Species ◽  
Important Species ◽  
Sediment Types ◽  
Area 7 ◽  
Pelliciera Rhizophorae ◽  
Composition Structure

This research describes the floristic composition and spatial distribution of the main mangroves species and other associated flora present in the estuarine sector of Térraba-Sierpe National Wetland, Costa Rican Pacific. Field survey consists of 1 127 points and 77 sampling points of 60x10m. Results of composition, structure and distribution of mangrove in HNTS exhibits a pattern or species zonation. We found variation from the coast to mainland and from the fringe or estuaries to the interior tidal flats. The species Rhizophora racemosa and Pelliciera rhizophorae showed greater spatial and continuous distribution, with the highest values of abundance (45.44% and 39.92% respectively), frequency (88.31% and 74.03%) and mangrove area (7 670.73ha and 5 824.94ha). The mangrove fern, Acrostichum aureum, was the third most important species, meanwhile, Avicennia spp., Rhizophora mangle y Laguncularia racemosa showed a segregated distribution or a tendency to local conglomeration, Talipariti tiliaceum var. pernambucense, Mora oleifera y Conocarpus erectus were found in very localized areas and other species were considered companions with low contribution to the total coverage. The dependence was confirmed between the presence of mangrove species and sediment type substrate. The species Avicennia spp. and L. racemosa tend to be distributed in sandy substrates more easily than the other species whose distribution is more homogeneous on muddy substrates 

scholarly journals Relações histórico - florísticas, fitossociologia e aspectos ecológicos do Alecrim (Holocalyx balansae Mich.) em floresta primária, na região de Formigueiro – RS

1993 ◽  
Vol 15 (15) ◽  
pp. 161
Author(s):  
Marcus V. Chamon Schmidt ◽  
José Newton Cardoso Marchiori ◽  
André R. Terra Nascimento ◽  
Adelino Alvarez Filho
Keyword(s):  
Reproductive Strategies ◽  
Floristic Composition ◽  
Climatic Changes ◽  
Southern Brazil ◽  
Rio Grande Do Sul ◽  
Wood Extraction ◽  
Forest Genetic ◽  
Composition Structure ◽  
Floristic Data

The forests of the Depressão Central in the State of Rio Grande do Sul, are in an advanced process of fragmentation, as a consequence of the expansion of the agriculture area. These fragments are in different degrees of conservation due to selective wood extraction and the action the cattle reising. The lack of studies about floristic composition, structure, reproductive strategies of arboreal species and the fragmentation effects on ecosystems, turn impratical any practice that garantee the conservation of forest genetic resourses in situ. This work relies on results obtained in a fragment untouched in Formigueiro county. Floristic data presented here are inserted in the dynamic context of the southern Brazil vegetation, under the influence of climatic changes in the Quaternary, identifing the original flora and the recent features of these forests. The structural analysis detected the occurence of alecrim (Holocalyx balansae Mich), a specie that in spite of being rare in the Depressão Central, presented high density in the study area. Based on the results obtained in loco, we conclude that alecrim is characterisis itself as a climax specie and, therefore, vulnerable to fragmentation. These informations, although incomplete, is of great importance in the conservation of produtive characteristics of forest. The lack of it, turns impratical the permanence of these fragments in rural properties.

scholarly journals Floristic composition, structure and species conservation status of Mauritia flexuosa palm swamps in Andean-Amazonian piedmont in the Department of San Martín, Peru

2021 ◽  
Vol 92 (0) ◽  
pp. 923186
Author(s):  
Yakov Mario Quinteros-Gómez ◽  
Octavio Monroy-Vilchis ◽  
Martha Mariela Zarco-González ◽  
Ángel Rolando Endara-Agramont ◽  
Xareni P. Pacheco
Keyword(s):  
Conservation Status ◽  
Species Conservation ◽  
Floristic Composition ◽  
Mauritia Flexuosa ◽  
Composition Structure ◽  
San Martín

scholarly journals Long-Term Changes in the Composition, Ecology, and Structure of Pinus mugo Scrubs in the Apennines (Italy)

Diversity ◽  
2018 ◽  
Vol 10 (3) ◽  
pp. 70 ◽  
Author(s):  
Valentina Calabrese ◽  
Maria Carranza ◽  
Alberto Evangelista ◽  
Marco Marchetti ◽  
Adriano Stinca ◽  
...  
Keyword(s):  
Structural Changes ◽  
Detrended Correspondence Analysis ◽  
Floristic Composition ◽  
Structural Features ◽  
High Mountain ◽  
Pinus Mugo ◽  
Mountainous Regions ◽  
Composition Structure ◽  
Arid Grasslands

Mountain ecosystems are vulnerable because of land-use and climate change. In this study, we performed a re-visitation study using historical and newly collected vegetation plots to explore the primary trends in the floristic, ecological, and structural features of Mediterranean Pinus mugo krummholz over past decades. The plant community composition over time (1992 vs. 2016–17) was analyzed by a detrended correspondence analysis followed by a statistical comparison of time steps and an analysis of the contribution of each species to temporal differences. Ecological and structural changes were analyzed by a permutational multivariate analysis of variance followed by a post hoc comparison. We observed relevant changes in the floristic composition, structure, and ecological characteristics of Pinus mugo scrub. Some subalpine and treeline species that characterize the early stages of Pinus mugo succession declined as several warm-adapted species increased. Furthermore, these changes were most likely due to the natural evolution of high-mountain krummholz combined with a thermophilization process occurring in alpine habitats. In contrast, a small group of cold-adapted species also increased, probably because the patchy spatial pattern of Pinus mugo scrubs gives rise to “mesic patches” in a matrix of arid grasslands. The re-visitation approach adopted for long-term analysis in this study can potentially be applied to other mountainous regions to better understand long-term ecological changes in high alpine vegetation.

scholarly journals ANÁLISE ESTRUTURAL E USO MÚLTIPLO DE ESPÉCIES ARBÓREAS EM FLORESTAS MANEJADAS NO MÉDIO VALE DO RIO CURUÁ-UNA, PARÁ

FLORESTA ◽  
2015 ◽  
Vol 45 (3) ◽  
pp. 465
Author(s):  
Diego Dos Santos Vieira ◽  
João Ricardo Vasconcellos Gama ◽  
Márcio Leles Romarco de Oliveira ◽  
Renato Bezerra Da Silva Ribeiro
Keyword(s):  
Rain Forest ◽  
Structural Changes ◽  
Floristic Composition ◽  
Amazon Forest ◽  
Multiple Use ◽  
Managed Forest ◽  
Importance Value ◽  
M 12 ◽  
Unmanaged Forest ◽  
Reduced Impact Logging

O objetivo deste estudo foi avaliar alterações florísticas e estruturais ocorridas em áreas de Floresta Ombrófila Densa no Pará, em decorrência das atividades de exploração de impacto reduzido. Para isso, foram utilizadas duas áreas de floresta não manejada (FNM1 e FNM2) e duas de floresta manejada (FM1 e FM2), explorada há quatro anos, com intensidade de corte de 30 m³.ha-1. Utilizou-se amostragem estratificada, com alocação de 24 parcelas de 28 x 350 m, sendo 12 na FM1 e 12 na FNM1, e 20 parcelas de 50 x 200 m, sendo nove na FM2 e 11 na FNM2, mensurando-se todos os indivíduos com DAP ≥ 10 cm. O delineamento foi inteiramente casualizado, com número diferente de repetições. No período de quatro anos após a exploração, ocorreram alterações não significativas na composição florística e abundância de indivíduos, no entanto os índices de Shannon calculados para as áreas diferiram significativamente. A espécie de maior valor de importância na FM1 e FNM1 foi Rinorea guianensis Aubl. e na FM2 e FNM2 foram Licania kunthiana Hook.f. e Richardella macrophylla (Lam.) Aubrév., respectivamente. Após quatro anos da colheita, foram identificadas diferenças significativas apenas no volume total e na dominância absoluta entre FM2 e FNM2.AbstractStructural analysis and multiple use of tree species in managed forest, Middle River Valley of Curuá-una, Pará. This research aimed to evaluate the floristic and structural changes in areas of dense rain forest in Pará, due to the reduced impact logging activities. Inorder to that, two areas of unmanaged forest were used (FNM1 and FNM2), and two of managed forest (FM1 and FM2), explored for four years with intensity of cut 30 m³.ha-1. A stratified sampling was used with allocation of 24 plots of 28 m x 350 m, 12 in the FM1and 12 in the FNM1, and 20 plots of 50 m x 200 m, 9 in the FM2 and 11 in the FNM2, we measured all individuals with DBH ≥ 10 cm. The lineation was completely randomized with different number of repetitions. In the period of four years after forest harvest, non-significant changes occurred in the floristic composition and abundance of individuals, however, the Shannon-Weaver indices calculated for the areas differed significantly. The species with the highest importance value in FM1 and FNM1 was Rinorea guianensis Aubl. and in FM2 and FNM2 were Licania kunthiana Hook.f. and Richardella macrophylla (Lam.) Aubrév., respectively. After four years of harvests, significant differences were found only in total volume and absolute dominance between FM2 and FNM2.Keywords: Phytosociology; Amazon; Forest management.

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