scholarly journals Termite mounds alter the spatial distribution of African savanna tree species: artefacts and real patterns

2016 ◽  
Vol 44 (4) ◽  
pp. 950-952 ◽  
Author(s):  
Gudeta W. Sileshi
Keyword(s):  
Spatial Distribution ◽  
Tree Species ◽  
Termite Mounds ◽  
African Savanna

Termite mounds alter the spatial distribution of African savanna tree species

2015 ◽  
Vol 43 (2) ◽  
pp. 301-313 ◽  
Author(s):  
Andrew B. Davies ◽  
Claire A. Baldeck ◽  
Gregory P. Asner
Keyword(s):  
Spatial Distribution ◽  
Tree Species ◽  
Termite Mounds ◽  
African Savanna

scholarly journals Impacts of Different Tree Species of Different Sizes on Spatial Distribution of Herbaceous Plants in the Nigerian Guinea Savannah Ecological Zone

Scientifica ◽  
2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Toma Buba
Keyword(s):  
Spatial Distribution ◽  
Species Richness ◽  
Open Field ◽  
Tree Species ◽  
Herbaceous Species ◽  
Ecological Zone ◽  
Vitellaria Paradoxa ◽  
Parkia Biglobosa ◽  
Species Richness And Diversity ◽  
Individual Trees

This study was aimed at finding the impacts of different tree species and individual trees of different sizes on species richness, diversity, and composition of the herbaceous layer. All the three tree species have greatly increased species richness and diversity both within and outside their crown zones compared with the open grassland. Both species richness and diversity were found to be higher under all the three tree species than outside their crowns, which was in turn higher than the open field.Daniella oliverihas the highest species richness and diversity both within and outside its crown zone followed byVitellaria paradoxaand thenParkia biglobosa. The result also revealed that the same tree species with different sizes leads to different herbaceous species richness, diversity, and composition under and around the trees’ crowns.P. biglobosaandV. paradoxatrees with smaller sizes showed higher species richness and diversity under their crowns than the bigger ones. The dissimilarity of species composition differs between the inside and outside crown zones of the individuals of the same tree species and among the different trees species and the open field.

scholarly journals Stand structure indices as tools to support forest management: an application in Trentino forests (Italy)

2013 ◽  
Vol 59 (No. 4) ◽  
pp. 159-168 ◽  
Author(s):  
F. Pastorella ◽  
A. Paletto
Keyword(s):  
Spatial Distribution ◽  
Forest Management ◽  
Species Diversity ◽  
Species Composition ◽  
Tree Species ◽  
Stand Structure ◽  
Composite Index ◽  
Mutual Position ◽  
Tree Species Composition ◽  
North East

Stand structure and species diversity are two useful parameters to provide a synthetic measure of forest biodiversity. The stand structure is spatial distribution, mutual position, diameter and height differentiation of trees in a forest ecosystem and it highly influences habitat and species diversity. The forest stand and species diversity can be measured through indices that provide important information to better address silvicultural practices and forest management strategies in the short and long-term period. These indices can be combined in a composite index in order to evaluate the complex diversity at the stand level. The aim of the paper is to identify and to test a complex index (S-index) allowing to take into account both the tree species composition and the stand structure. S-index was applied in a case study in the north-east of Italy (Trentino province). The results show that the Norway spruce forests in Trentino province are characterized by a medium-low level of complexity (S-index is in a range between 0.14 and 0.46) due to a low tree species composition rather than to the stand structure (diametric differentiation and spatial distribution of trees).  

Influence of tree species and compass bearing on insect folivory of nine common tree species in the West African savanna

2005 ◽  
Vol 21 (2) ◽  
pp. 227-231 ◽  
Author(s):  
Sybille B. Unsicker ◽  
Karsten Mody
Keyword(s):  
Tree Species ◽  
Land Surface ◽  
Insect Herbivory ◽  
West African ◽  
Leaf Damage ◽  
Tropical Rain Forests ◽  
The West ◽  
African Savanna ◽  
The World ◽  
Plant Animal Interactions

Levels of leaf damage due to insect folivory have been investigated in forests of different latitudes all over the world, but most research has concentrated on a few common forest types. Most studies of insect herbivory were conducted in (sub)tropical rain forests (Barone 1998, Basset 1996, Coley 1983, Lowman 1985), or in temperate forests (Landsberg & Ohmart 1989, Lowman & Heatwole 1992). In contrast, little is known about insect folivory of woody plants in tropical savannas (Fowler & Duarte 1991, Marquis et al. 2001, Ribeiro 2003, Stanton 1975), and no such data are available for the West African savanna ecosystem (Andersen & Lonsdale 1990). Savannas cover about 40% of the land surface of Africa and 20% of the world (Scholes & Walker 1993), and savanna trees may host considerable numbers of insects, including many herbivores (Grant & Moran 1986, Mody et al. 2003). Therefore, insect herbivory can be considered a potentially important aspect of plant–animal interactions for vast areas of tropical ecosystems, where it has been studied remarkably rarely so far.

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