Plantes de Ponent noves per a la flora de Catalunya

Es comenten les dades corològiques i ecològiques de quatre plantes presents al territori sicòric (Diplotaxis ilorcitana, Lappula patula, Trinia dufourii, Mantisalca duriaei) que són noves per a la flora catalana. Aquestes localitats representen l'extrem oriental de la seva àrea de distribució a la vall de l'Ebre. També es dóna notícia de la presència de Linaria oligantha, un endemisme del SE ibèric, coŀlectada un sol cop a Catalunya el 1919 i que no havia estat retrobada.Chorological and ecological data of four species located in the Sicoric territory (Diplotaxis ilorcitana, Lappula patula, Trinia dufourii, Mantisalca duriaei) new for the Catalonian flora are reported. These localities represent the eastern limit of their distribution area in the Ebro valley. Furthermore, Linaria oliganthas presence is notified. This is an SE Iberian endemism, which was collected once in Catalonia in 1919 and had no been found since then

Configurational crop heterogeneity increases within-field plant diversity

Increasing landscape heterogeneity by restoring semi-natural elements to reverse farmland biodiversity declines is not always economically feasible or acceptable to farmers due to competition for land. We hypothesized that increasing the heterogeneity of the crop mosaic itself, hereafter referred to as crop heterogeneity, can have beneficial effects on within-field plant diversity. Using a unique multi-country dataset from a cross-continent collaborative project covering 1,451 agricultural fields within 432 landscapes in Europe and Canada, we assessed the relative effects of compositional and configurational crop heterogeneity on within-field plant diversity components. We also examined how these relationships were modulated by the position within the field. We found strong positive effects of configurational crop heterogeneity on within-field plant alpha and gamma diversity in field interiors. These effects were as high as the effect of semi-natural cover. In field borders, effects of crop heterogeneity were limited to alpha diversity. We suggest that a heterogeneous crop mosaic may overcome the high negative impact of management practices on plant diversity in field interiors, whereas in field borders, where plant diversity is already high, landscape effects are more limited. Synthesis and applications. Our study shows that increasing configurational crop heterogeneity is beneficial to within-field plant diversity. It opens up a new effective and complementary way to promote farmland biodiversity without taking land out of agricultural production. We therefore recommend adopting manipulation of crop heterogeneity as a specific, effective management option in future policy measures, perhaps adding to agri-environment schemes, to contribute to the conservation of farmland plant diversity