Ecosystem and restoration consequences of invasive woody species removal in Hawaiian lowland wet forest

  • Published source details Ostertag R., Cordell S., Michaud J., Cole T.C., Schulten J.R., Publico K.M. & Enoka J.H. (2009) Ecosystem and restoration consequences of invasive woody species removal in Hawaiian lowland wet forest. Ecosystems, 12, 503-515.


This study is summarised as evidence for the following.

Action Category

Mechanically/manually remove invasive plants

Action Link
Forest Conservation
  1. Mechanically/manually remove invasive plants

    A replicated, controlled study in 2004-2007 in lowland wet forest in Hawaii, USA (Ostertag et al. 2009) found that removal of all introduced species decreased leaf density but did not affect growth rate of native species. The forest leaf density (leaf area index) was lower in removal (2.5 m2 leaf/m2) than in control plots (6 m2 leaf/m2). For the three main native species, relative growth rate (Diospyros sandwicensis: 0.1%; Metrosideros polymorpha: 0.2%-0.3%; Psychotria hawaiiensis: 3.5%-3.9%) and absolute diameter at breast height growth (D. sandwicensis: 0.01-0.02; M. polymorpha: 0.07; P. hawaiiensis: 0.16-0.19 cm/yr) were similar. In April–June 2004, four pairs of control and removal (all introduced species removed) treatment plots (10 × 10 m) were replicated in three transects. The forest leaf area index was measured in February 2006. Growth of native trees was evaluated in 2007.


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