Woody Species Alpha-diversity and Species Abundance Distributions in an African Semi-deciduous Tropical Rain Forest

Biotropica ◽  
2015 ◽  
Vol 47 (4) ◽  
pp. 424-434 ◽  
Author(s):  
Edward N. Mwavu ◽  
Ed T. F. Witkowski
Keyword(s):  
Rain Forest ◽  
Tropical Rain Forest ◽  
Species Abundance ◽  
Alpha Diversity ◽  
Woody Species ◽  
Species Abundance Distributions

Vascular plant community dynamics following hexazinone site preparation in the lower Coastal Plain

1993 ◽  
Vol 23 (10) ◽  
pp. 2216-2229 ◽  
Author(s):  
R. Neal Wilkins ◽  
Wayne R. Marion ◽  
Daniel G. Neary ◽  
George W. Tanner
Keyword(s):  
Plant Community ◽  
Community Dynamics ◽  
Vascular Plant ◽  
Species Abundance ◽  
Woody Species ◽  
Application Rate ◽  
Site Preparation ◽  
Herbaceous Vegetation ◽  
Growing Seasons ◽  
Species Abundance Distributions

Differential responses of vascular plant community compositions, diversities, and species-abundance distributions to hexazinone site preparation were evaluated on three 1-year-old clearcuts, each representing a point along a generalized edaphic gradient (xeric sandhill, mesic flatwoods, and hydric hammock). Foliar cover by species was sampled along four 20-m permanent line transects within each of three blocked replications of hexazinone treatments (0.0, 1.7, 3.4, and 6.8 kg/ha) at pretreatment and after the first and second growing seasons post-treatment. Cover by woody species decreased with increasing hexazinone rates on all sites (P < 0.05). Herbaceous vegetation recovered from first-season reductions to levels that did not vary with treatment (xeric sandhill and mesic flatwoods) or increased with increasing hexazinone rates (hydric hammock). Hexazinone tolerance by Gelsemiumsempervirens (L.) Ait.f. and Vaccinium spp. on the xeric sandhill and Ilexglabra (L.) Gray and G. sempervirens on the mesic flatwoods influenced diversity responses by woody and herbaceous vegetation. With increasing rates, herbaceous diversity decreased on the xeric sandhill, did not vary on the mesic flatwoods, and increased on the hydric hammock. Plant community responses to hexazinone were found to be functions of application rate, edaphic factors, adaptive strategies of resident species, and the presence or absence of hexazinone-tolerant species.

Comparative longevity of seeds of five tropical rain forest woody species stored under different moisture conditions

1996 ◽  
Vol 74 (10) ◽  
pp. 1635-1639 ◽  
Author(s):  
Carlos Vázquez-Yanes ◽  
Alma Orozco-Segovia
Keyword(s):  
Rain Forest ◽  
Tropical Rain Forest ◽  
Room Temperature ◽  
Soil Seed Bank ◽  
Woody Species ◽  
Lettuce Seeds ◽  
Absolute Requirement ◽  
Moisture Regimes ◽  
Petri Dishes ◽  
Moisture Conditions

Seeds of five plant species from the tropical rain forest of southeastern Mexico were stored for up to 7 years under two divergent moisture regimes at room temperature: (i) air-dried seeds were stored in paper bags and (ii) water-imbibed seeds were stored in Petri dishes kept in total darkness. Seeds in the latter regime remained dormant because of an absolute requirement of light for germination. Another experiment involved the storage of seeds of one of the species in a gradient of intermediate moisture conditions within glass chambers. Results indicate that water-imbibed seeds retain viability for a longer time than any of the other moisture levels employed. This agreed with observations made on photoblastic lettuce seeds by other authors. Keywords: Carica, Piper, longevity of imbibed seeds, soil seed bank, tropical rain forest, Urera.

scholarly journals Beta diversity patterns derived from island biogeography theory

2018 ◽  
Author(s):  
Muyang Lu ◽  
David Vasseur ◽  
Walter Jetz
Keyword(s):  
Community Composition ◽  
Beta Diversity ◽  
Island Biogeography ◽  
Species Abundance ◽  
Alpha Diversity ◽  
Species Level ◽  
Neutral Model ◽  
Diversity Patterns ◽  
Species Abundance Distributions ◽  
Species Area

AbstractThe Theory of Island Biogeography (TIB) has been successful in predicting alpha diversity patterns such as species-area relationships and species-abundance distributions. Although beta diversity (i.e. the dissimilarity of community composition) has long been recognized as an important element of the TIB and is crucial for understanding community assembly processes, it has never been formally incorporated into the theory. Here we derive theoretical predictions for the expected pairwise beta diversity values under a species-level neutral scenario where all species have equal colonization and extinction rates. We test these predictions for the avian community composition of 42 islands (and 93 species) in the Thousand Island Lake, China. We find that alpha diversity patterns alone do not distinguish a species-level neutral model from a non-neutral model. In contrast, beta diversity patterns clearly reject a species-level neutral model. We suggest that the presented theoretical integration beta diversity offers a powerful path for testing the presence of neutral processes in ecology and biogeography.

The Effects of a Tropical rain Forest Cover on Airborne Gamma-Ray Spectrometry

2018 ◽  
Vol 1 (2) ◽  
Author(s):  
Enio B. Pereira ◽  
Daniel J.R. Nordemann
Keyword(s):  
Rain Forest ◽  
Tropical Rain Forest ◽  
Forest Cover ◽  
Gamma Ray ◽  
Gamma Ray Spectrometry

Para solicitação de resumo, entrar em contato com editor-chefe ([email protected]). 

scholarly journals (5d RG-flow) trees in the tropical rain forest

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Marieke van Beest ◽  
Antoine Bourget ◽  
Julius Eckhard ◽  
Sakura Schäfer-Nameki
Keyword(s):  
Large Class ◽  
Rain Forest ◽  
Tropical Rain Forest ◽  
Field Theories ◽  
Flavor Symmetry ◽  
Superconformal Field Theories ◽  
Hasse Diagrams ◽  
Flavor Symmetries ◽  
Rank 2 ◽  
Mass Deformation

Abstract 5d superconformal field theories (SCFTs) can be obtained from 6d SCFTs by circle compactification and mass deformation. Successive decoupling of hypermultiplet matter and RG-flow generates a decoupling tree of descendant 5d SCFTs. In this paper we determine the magnetic quivers and Hasse diagrams, that encode the Higgs branches of 5d SCFTs, for entire decoupling trees. Central to this undertaking is the approach in [1], which, starting from the generalized toric polygons (GTPs) dual to 5-brane webs/tropical curves, provides a systematic and succinct derivation of magnetic quivers and their Hasse diagrams. The decoupling in the GTP description is straightforward, and generalizes the standard flop transitions of curves in toric polygons. We apply this approach to a large class of 5d KK-theories, and compute the Higgs branches for their descendants. In particular we determine the decoupling tree for all rank 2 5d SCFTs. For each tree, we also identify the flavor symmetry algebras from the magnetic quivers, including non-simply-laced flavor symmetries.

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