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Landscapes Forest and Global Change - ESA - Escola Superior ...

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A. Ouin et al. 2010. Do wooded elements in agricultural l<strong>and</strong>scape contribute to biological control in crops<br />

728<br />

60<br />

early average abundance of<br />

hoverflies (eggs+larvae)<br />

50<br />

40<br />

30<br />

20<br />

10<br />

0<br />

2003 2004 2005 2006 2007<br />

Year<br />

Wooded l<strong>and</strong>scape<br />

Less wooded l<strong>and</strong>scape<br />

Figure 1: Early average abundance (the first four records) of hoverflies in wheat fields in wooded <strong>and</strong> less<br />

wooded l<strong>and</strong>scapes during the five years.<br />

<strong>Forest</strong> species (n=707, s=3)<br />

Generalist species (n=710, s=12)<br />

Open habitat species (n=324, s=21)<br />

0 10 20 30 40 50<br />

0 10 20 30 40 50<br />

0 10 20 30 40 50<br />

Edge Intermediate Center<br />

Edge Intermediate Center<br />

Edge Intermediate Center<br />

Figure 2 : Density of overwintering ground beetles (number of individuals per square meter) in the edge,<br />

intermediate area <strong>and</strong> center of a woodlot, according to habitat preference of the adults. The extent of the<br />

boxes represents the first <strong>and</strong> third quantiles, the bold trait is the median.<br />

<strong>Forest</strong> <strong>L<strong>and</strong>scapes</strong> <strong>and</strong> <strong>Global</strong> <strong>Change</strong>-New Frontiers in Management, Conservation <strong>and</strong> Restoration. Proceedings of the IUFRO L<strong>and</strong>scape Ecology<br />

Working Group International Conference, September 21-27, 2010, Bragança, Portugal. J.C. Azevedo, M. Feliciano, J. Castro & M.A. Pinto (eds.)<br />

2010, Instituto Politécnico de Bragança, Bragança, Portugal.

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