 We also evaluate the effects of the landscape structure on the pollination, and demonstrate that it exists an optimal size of natural habitat patches which maximize the pollination service for a fixed fraction of natural habitat .
<clarity>  We also evaluate the effects of the landscape structure on the pollination, and demonstrate that it exists an optimal size of natural habitat patches which maximize the pollination service for a fixed fraction of natural habitat .
 We also evaluate the effects of the landscape 's structure on pollination, and demonstrate that it exists an optimal size of natural habitat patches which maximize the pollination service for a fixed fraction of natural habitat .