Environment patterns and influential factors of biological invasions: a worldwide survey
2011
WenJun Zhang | Bin Chen
Invasive species damage ecological balance, reduce species diversity and threat humans. Biological invasions have become a global problem. In order to provide knowledge on prediction, impact assessment, control management and mechanism exploration of biological invasions, the present study analyzed the environment patterns and influential factors of biological invasion worldwide, and developed quantitative relationships of biological invasions based on the data extracted from global invasive species database. The results indicated that human buildings were mostly invaded by invasive species, second by natural forest and agricultural area. Human disturbed environments held the largest numbers of invasive species. The number of invasive species in a country was positively correlated to the level of economic development and trade activity of the country. There were not linear correlations between the number of invasive species and annual precipitation and annual mean air temperature. There was a suitable range for both annual precipitation and annual mean air temperature within which biological invasions occur more frequently. Land area of a country was not responsible for the number of invasive species. Regression models were developed to describe the relationships between the number of invasive species and climate and economically motivated human activity. It is concluded that economically motivated human activity plays important role in the introduction of invasive species. Geographical adjacency and climate and environment similarity are responsible for the higher similarity of invasive species between countries. In addition, island countries have more invasive species than non-island countries.
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