Ecologists have used several slightly different definitions of alpha diversity.
2.
Gamma diversity and alpha diversity can be calculated directly from species inventory data.
3.
Definitions of alpha diversity can also differ in what they assume species diversity to be.
4.
Then alpha diversity can be calculated in two different ways that give the same result.
5.
Then gamma diversity is the total species diversity in the dataset and alpha diversity the mean species diversity per subunit.
6.
Here gamma diversity is the total species diversity of a landscape and alpha diversity is the mean species diversity per habitat.
7.
Suppose species diversity is equated with the effective number of species, and alpha diversity with the mean species diversity per subunit.
8.
Moreover, figs with different plant habits have undergone adaptive radiation in different biogeographic regions, leading to very high levels of alpha diversity.
9.
If absolute species turnover is divided by alpha diversity, a measure is obtained that quantifies how many times the species composition changes completely among the subunits of the dataset.
10.
Invasive species seem to increase local ( i . e . : alpha diversity ) diversity, which decreases turnover of diversity ( i . e . : beta diversity ).
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