Abstract Non-indigenous freshwater bivalves negatively affect invaded ecosystems through different mechanisms, including inter-specific competition for trophic resources. Here, we investigated in Lake Trasimeno (Central Italy) the diet of invasive Dreissena polymorpha and native Anodonta anatina . ? 15 N 13 C stable isotopes were measured winter summer bivalves, phytoplankton, sedimentary organ...

CactusWorld 2016 Vol. 34 (3) Aloe is a large genus of over 500 species (Carter et al, 2011) and even today that number continues to increase. Of these, a very small number of species, perhaps no more than 20, are unusual in having hairy flowers. These are concentrated in southern Arabia and the Horn of Africa. In respect of Saudi Arabia, for example, Collenette (1999) records 22 species of Aloe...