From 1920 to 1950, a tree species called albizia ( Falcataria moluccana ) was brought to Hawai‘i from islands located north and northeast of Australia. A fast-growing tree, albizia now grows all over Hawai‘i and is taking over the places where native trees have grown. The scientists in this study had observed an increase in nitrogen in some Hawaiian streams. The places where nitrogen was increasing were areas with albizia trees growing along the streams. The scientists wanted to know if aquatic Topics: Active Forest Management, Water, Wildlife, Albizia Trees, Algae, Food Web, Invasive Species, Nitrogen.