Environmental heterogeneity explains contrasting plant species richness between the South African Cape and southwestern Australia

2021 ◽  
Author(s):  
Ruan Mazijk ◽  
Michael D. Cramer ◽  
G. Anthony Verboom
Keyword(s):  
Species Richness ◽  
South African ◽  
Plant Species ◽  
Environmental Heterogeneity ◽  
Plant Species Richness ◽  
The South ◽  
Southwestern Australia

Landscape-scale patterns in plant species richness along an arctic river

1997 ◽  
Vol 75 (10) ◽  
pp. 1748-1765 ◽  
Author(s):  
William A. Gould ◽  
Marilyn D. Walker
Keyword(s):  
Species Richness ◽  
Plant Species ◽  
Soil Ph ◽  
Environmental Heterogeneity ◽  
Landscape Heterogeneity ◽  
Vascular Plant ◽  
Plant Species Richness ◽  
The North ◽  
Environmental Controls ◽  
July Temperature

We examined relationships of vascular plant species richness with mean July temperature and components of landscape heterogeneity to determine the relative influence of temperature and the physical landscape on plant richness along the north-flowing Hood River in the Northwest Territories of Canada. We also examined variations in the composition of the flora to better understand the relationship between riparian gradients, environmental controls, environmental heterogeneity, and species richness. The vascular flora for the area studied includes 210 species. Richness at 17 sites along the river ranged from 69 to 109 species within 2400-m2 sample areas. Sites with the lowest richness were those in the upper reaches of the river, with richness generally increasing downstream. Variation in richness along the river is correlated with increasing environmental heterogeneity (r2 = 0.598, P = 0.0003), calculated as an index summarizing the range of site-level variation in a set of components including substrate type and texture, topographic variation (slope and aspect), relative surface area, substrate moisture, and soil pH. The most significant component of the index is an increase in the range of soil pH. Soil pH tends to increase downstream, and average site soil pH is the single best predictor of species richness (r2 = 0.857, P < 0.0001). The primary cause of higher soil pH is the presence of uplifted marine sediments, and tills derived from nonacidic Precambrian rock common along the lower river. Key words: species richness, arctic, riparian, pH, mean July temperature, environmental heterogeneity.

Coarse‐scale plant species richness in relation to environmental heterogeneity

2003 ◽  
Vol 14 (5) ◽  
pp. 661-668 ◽  
Author(s):  
Juli G. Pausas ◽  
Jordi Carreras ◽  
Albert Ferré ◽  
Xavier Font
Keyword(s):  
Species Richness ◽  
Plant Species ◽  
Environmental Heterogeneity ◽  
Plant Species Richness ◽  
Coarse Scale

Multi-scale environmental heterogeneity as a predictor of plant species richness

2011 ◽  
Vol 26 (6) ◽  
pp. 851-864 ◽  
Author(s):  
Jennifer K. Costanza ◽  
Aaron Moody ◽  
Robert K. Peet
Keyword(s):  
Species Richness ◽  
Plant Species ◽  
Environmental Heterogeneity ◽  
Plant Species Richness ◽  
Multi Scale
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