Faculty of Mathematics and Natural Sciences - Biogeography

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A mix of sparing and sharing is more optimal than either land use strategy

Aligning food production with biodiversity conservation is a great challenge of our time. Much scientific debate has centered on whether land sparing (separating conservation and agriculture) or land sharing (integrating the two) is superior in this regard. A new paper by Van Butsic and Tobias Kuemmerle in Ecological Applications shows that at the landscape scale, a mix of both strategies outperforms both sharing and sparing in most cases. The paper also introduces an modelling framework to derive more optimal solutions than choosing between the black and white alternatives of sharing vs. sparing.

 

Using optimization methods to align food production and biodiversity conservation beyond land sharing and land sparing

 

Van Butsic | Tobias Kuemmerle

 

Aligning food production with biodiversity conservation is one of the greatest challenges of our time. One framing of this challenge is the land sharing vs. land sparing debate. Much empirical research has focused on identifying the relationship between agricultural yields and species populations, and using the relative number of species with particular relationships to inform landscape-level management. We feel this is misguided, as such an approach does not guarantee the existence of every species of conservation concern. Here, we show that constrained optimization methods can be used to identify landscape-level solutions which maximize agricultural yields and populations for any number of species. Our results suggest that the relative number of species with particular yield density curves is not a good indicator as to how landscapes should be managed. Likewise, choosing between blanket sharing or sparing strategies leads to suboptimal outcomes at the landscape scale in many cases. Our framework makes maximum use of the rich information contained in yield density curves to move beyond black and white choices and towards more nuanced, context-specific solutions to aligning biodiversity conservation and agricultural production. Such optimal landscapes will likely have features of both sharing and sparing strategies.

 

Link to the mansucript: http://dx.doi.org/10.1890/14-1927.1

Citation: Butsic, V. & Kuemmerle, T. (2014) Using optimization methods to align food production and biodiversity conservation beyond land sharing and land sparing. Ecological Applications, in press.