After heavy rainfall, vines and other climbing plants overgrow the shrubs and trees. When it gets drier, the vines shrink to dry, dead stems.
Maybe they prevent the trees growing too big in wet times, and so prevent them from dying in dry times.
The rubber-vine Palu di Leche, which has a lot of flowers in the wet season, lives on in the dry season (without flowers). It is unstoppable in its growth and strangles any plant or tree that it "embraces".
