The slopes of the species-area curve in continental areas are compared as much steeper to the value found for island communities in general.
The slope of the line is much steeper if you analyze the species-area relationships across extremely large areas, such as entire continents of Z value 0.6 to 1.2. The slope of a species-area curve that is constructed using scattered areas (or islands) will be steeper (have a higher z-value) than one that is composed of contiguous subplots; additionally, the greatest discrepancy between the richness estimated for the smallest areas and the regional richness value occurs as the sample unit size increases. The relationship between a habitat's area or a portion of it and the number of species found there is known as the species-area relationship or species-area curve.
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