scholarly journals Biotically driven vegetation mosaics in grazing ecosystems: the battle between bioturbation and biocompaction

2017 ◽  
Vol 87 (3) ◽  
pp. 363-378 ◽  
Author(s):  
Ruth A. Howison ◽  
Han Olff ◽  
Johan van de Koppel ◽  
Christian Smit
Keyword(s):  
Vegetation Mosaics

Simplifying the savanna: the trajectory of fire-sensitive vegetation mosaics in northern Australia

2012 ◽  
Vol 39 (7) ◽  
pp. 1303-1317 ◽  
Author(s):  
Jeremy Russell-Smith ◽  
Andrew C. Edwards ◽  
Owen F. Price
Keyword(s):  
Northern Australia ◽  
Vegetation Mosaics

Diversity and Abundance of Lepidopteran Stem Borers and Their Respective Native Hosts in Different Vegetation Mosaics in Tanzania

2018 ◽  
Vol 26 (1) ◽  
pp. 50-62 ◽  
Author(s):  
G.O. Ong'amo ◽  
B. Pallangyo ◽  
A. Ali ◽  
M. Njaku ◽  
B.P. Le Ru
Keyword(s):  
Stem Borers ◽  
Vegetation Mosaics

Effects of social behaviour on patch utilization by sheep in a complex vegetation mosaic

2005 ◽  
Vol 2005 ◽  
pp. 63-63
Author(s):  
A. M. Sibbald ◽  
S. P. Oom ◽  
R. J. Hooper ◽  
R. Anderson
Keyword(s):  
Social Interactions ◽  
Small Groups ◽  
Patch Size ◽  
Calluna Vulgaris ◽  
Heterogeneous Environments ◽  
Vegetation Types ◽  
The Relationship ◽  
Vegetation Mosaics ◽  
Vegetation Patches ◽  
Vegetation Mosaic

In heterogeneous environments, such as complex vegetation mosaics, there is likely to be a dynamic interaction between the spatial pattern of the vegetation and the distribution of the animals grazing there. Preferences for particular vegetation types will influence where animals choose to feed and, in turn, changes to the vegetation caused by damage from grazing and trampling will affect the dynamics of the mosaic. Social interactions, amongst highly social grazers such as sheep, can also affect the distribution of the animals, depending on the relationship between the dimensions of vegetation patches and the characteristic spacing of the animals. The aim of this study was to investigate the relationship between patch utilization and patch size for small groups of Scottish Blackface sheep foraging in a natural heather (Calluna vulgaris ) and grass mosaic.

scholarly journals The effects of shifting vegetation mosaics on habitat suitability for coastal dune fauna—a case study on sand lizards (Lacerta agilis)

2011 ◽  
Vol 16 (1) ◽  
pp. 89-99 ◽  
Author(s):  
Bart Wouters ◽  
Marijn Nijssen ◽  
Gertjan Geerling ◽  
Hein Van Kleef ◽  
Eva Remke ◽  
...  
Keyword(s):  
Habitat Suitability ◽  
Coastal Dune ◽  
Lacerta Agilis ◽  
Vegetation Mosaics

scholarly journals Populational Structure of Eugenia sp. in Paraban Semiarid of State, Brazil

2019 ◽  
pp. 1-5
Author(s):  
André Japiassú ◽  
Josimar Gomes Dantas ◽  
Francisco de Oliveira Mesquita ◽  
Adriana Araújo Diniz ◽  
Anailson de Sousa Alevs ◽  
...  
Keyword(s):  
Basal Area ◽  
Ground Level ◽  
Aggregation Index ◽  
Aggregation Pattern ◽  
Disturbed Areas ◽  
Cluster Area ◽  
Absolute Density ◽  
History Of ◽  
Number Of Individuals ◽  
Vegetation Mosaics

The genus Eugenia presents one of the most important in Myrtaceae family, expressing a potential nutritional high and in drugs obtaining. The plants are resist and resist disease, their hardwood has been used to produce posts, stakes, poles, firewood and charcoal. The objective of this present work was to conduct a survey of the population structure of Eugenia sp. was conducted in caatinga area, located in the municipality of Caturité, PB. Were sampled Forty plots of 10x20 m, totaling a sample area of 8.000 m². All shrub-tree individuals were inventoried by the taking the ground level diameter (DNS), height and number of tillers. The vegetation structure was evaluated by basal area, absolute density, absolute frequency and aggregation index of the species. A total of 741 individuals of Eugenia sp. Distributed in four vegetation mosaics with a history of different uses, which were conventionally approached as: A I = Abandoned quarry area; A II = Bottom of the valley; A III = Conserved Area and A IV = Capoeira Area. Area I presented a total of 92 individuals sampled in the 10 experimental plots (DA = 460), where in this environment the species tended to cluster, Area II presented 124 individuals (DA = 620) and the McGuines index expressed that in this environment the species finds grouped. In Area III, 480 individuals were sampled with an absolute density of 2,400 ind. ha-1 grouped. The density of Eugenia sp. Was performed descriptive statistical analysis. It is different in vegetation mosaics due to the history of land use in the studied areas. The largest number of individuals of Eugenia sp. is concentrated in the conserved area showing aggregation pattern. In all areas of study, individuals have low stem diameter, expressing the importance of the species in the regeneration of disturbed areas. In the quarry area are the individuals with higher height.

Fire-patterned vegetation and the development of organic soils in the lowland vegetation mosaics of south-west Tasmania

2011 ◽  
Vol 59 (2) ◽  
pp. 126 ◽  
Author(s):  
S. W. Wood ◽  
Q. Hua ◽  
D. M. J. S. Bowman
Keyword(s):  
Soil Depth ◽  
Isotope Composition ◽  
Organic Soil ◽  
Fire Frequency ◽  
Organic Soils ◽  
Soil Profiles ◽  
Radiocarbon Age ◽  
South West ◽  
Vegetation Boundary ◽  
Vegetation Mosaics

Two contrasting ecological models have been proposed for the forest–moorland vegetation mosaics of south-west Tasmania that stress different interactions between fire, soils, vegetation and the physical environment to produce either stable or dynamic vegetation patterns. We investigated aspects of these models by sampling organic soil profiles across vegetation mosaics to determine variation in soil depth, organic carbon (C) content, nutrient capital, stable C isotope composition (δ13C) and 14C radiocarbon age in two contrasting landscape settings. 14C basal ages of organic soils ranged from recent (<400 calibrated (cal.) years BP) to mid Holocene (~7200 cal. years BP), with a tendency for older soils to be from poorly drained moorlands and younger soils from the forest. The long-term net rate of C accumulation ranged from 2.7 to 19.2 gC m–2 year–1, which is low compared with northern hemisphere peatland systems. We found that δ13C in organic soil profiles cannot be used to infer Holocene vegetation boundary dynamics in these systems. We found a systematic decrease of phosphorus from rainforest through eucalypt to moorland, but estimated that phosphorus capital in moorland soils was still sufficient for the development of forest vegetation. Our results suggest that the characteristics of organic soils across the landscape are the result of interactions between not only vegetation and fire frequency, but also other factors such as drainage and topography.

Soils and open ecosystems

2019 ◽  
pp. 82-95
Author(s):  
William J. Bond
Keyword(s):  
Soil Properties ◽  
Vegetation Structure ◽  
Competitive Exclusion ◽  
Chemical Characteristics ◽  
Forest Trees ◽  
Physical And Chemical Characteristics ◽  
A Site ◽  
Physical And Chemical ◽  
Vegetation Mosaics

Boundaries between open and closed ecosystems often coincide with soil differences of greater or lesser degree. It has long been argued that these soil differences explain the striking differences in vegetation structure. But the nature of the vegetation itself feeds back on soil properties so that it is far from trivial to determine whether soil differences are a cause or consequence of the vegetation growing at a site. This chapter reviews soil physical and chemical characteristics and their potential to determine open and closed vegetation mosaics. The chapter also explores competitive exclusion of forest trees by grasses, herbs, and shrubs.

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