Capture mechanism in Palaeotropical pitcher plants (Nepenthaceae) is constrained by climate

• DOI: 10.1093/aob/mct195
• Publication Date: 2013-08-24T01:07:46Z
• Authors: Jonathan A. Moran; Laura K. Gray; Charles Clarke; Lijin Chin
• Keywords: Carnivorous plant

(Nepenthaceae, approx. 120 species) are carnivorous pitcher plants with a centre of diversity comprising the Philippines, Borneo, Sumatra and Sulawesi. Nepenthes pitchers use three main mechanisms for capturing prey: epicuticular waxes inside pitcher; wettable peristome (a collar-shaped structure around opening); viscoelastic fluid. Previous studies have provided evidence suggesting that first mechanism may be more suited to seasonal climates, whereas latter two might perhumid environments. In this study, idea was tested using climate envelope modelling. A total 94 species, 1978 populations, were grouped by prey capture (large peristome, small waxy, waxless, viscoelastic, non-viscoelastic, 'wet' syndrome 'dry' syndrome). Nineteen bioclimatic variables used model habitat suitability at 1 km resolution each group, Maxent, presence-only species distribution modelling program. Prey groups putatively associated conditions syndrome) had restricted areas probable than those less humid (small non-viscoelastic and'dry' Overall, group showed most area modelled suitable habitat. The current study is demonstrate in plant constrained climate. employing peristome-based fluid-based largely regions; contrast, wax-based allows successful both areas. Possible reasons maintenance discussed relation costs benefits given strategy.