Schnitzer proposes a novel mechanistic theory to explain this pattern, drawing support from several independent lines of empirical evidence. The theory is based on the ability of lianas to undergo less water stress and thus grow during seasonal droughts, while their competitors remain mostly dormant. This capacity for dry season growth gives lianas a competitive advantage that, over many decades, may result in higher abundance of lianas in seasonal tropical forests. In aseasonal wet forests, however, this competitive advantage is lost, explaining the relative paucity of lianas. The theory is then extended to explain the striking patterns of liana abundance at two additional spatial scales: the decrease in lianas along the latitudinal gradient, from the tropics northward, and the clumped distribution of lianas at the local, within-forest scale.
This researcj explains both the patterns of abundance and distribution of an important group of plants, as well as provides a framework that can be used to predict the change in liana abundance worldwide with global climate change.
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Stefan A. Schnitzer, "A mechanistic explanation for global patterns of liana abundance and distribution"166:2 August 2005.