Seed dispersal properties of three pine species as a determinant of invasive potential

Data on the seed morphology of three pine species (Pinus pinea L., P. pinaster Ait., and P. radiata D. Don) in the south-western Cape Province are presented. The seeds of both P. pinaster and P. radiata are relatively small (50 and 20 mg respectively) and have relatively large wings (190 and 110 mm2 respectively). Pinus pinea, on the other hand, has a relatively large (700 mg) seed and a small wing (24 mm2). We show that P. pinaster is capable of dispersal away from the parent trees, whereas P. pinea seedlings occur only under parent trees. This supports the hypothesis that P. radiata and P. pinaster tend to be invasive by virtue of possessing winged seeds adapted for long-range dispersal. Data op die saadmorfologie van drie dennesoorte in die Suidwes-Kaap (Pinus pinea L., P. pinaster Ait. en P. radiata D. Don) word gegee. Die saad van beide P. pinaster en P. radiata is relatief klein (50 en 20 mg respektiewelik) en is relatief sterk gevleuel (vlerk oppervlaktes van 190 en 110 mm2 respektiewelik). Pinus pinea het ’n groot saad (630 mg) en is swak gevleuel (vlerk oppervlakte van 20 mm2). Ons toon dat P. pinaster instaat is om vanaf die moederplant te versprei, terwyl saailinge van P. pinea slegs onder die kroon van moederplante voorkom. Hierdie gegewens ondersteun die hipotese dat P. radiata en P. pinaster geneig is om natuurlike plantegroei in te dring omdat hulle sterk gevleuelde sade het, wat oor lang afstande kah versprei.

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