Lamont Byron B, Klinkhamer Peter G L, Witkowski E T F
School of Environmental Biology, Curtin University of Technology, PO Box U1987, 6001, Perth, Australia.
Institute of Fvolutionary and Environmental Sciences, Research Group Ecology of Plants and Herbivores, University of Leiden, PO Box 9516, NL-2300 RA, Leiden, The Netherlands.
Oecologia. 1993 Jun;94(3):446-450. doi: 10.1007/BF00317122.
All individuals of all known populations of Banksia goodii were assessed for seed production. Small populations produced no or only a few seeds per unit canopy area. Effects of population size on seed production per unit area and seed production per plant were present over the whole range of population sizes, indicating that even in large populations seed production may still not be at its maximum. Resource differences could not explain this disproportionate decrease in seed production with decline in population size, because there were no differences in soil properties and understorey or overstorey cover between the small and large populations. Although plants in small and large populations were similar in size, seed production per plant was much lower in small populations. This was not because plants in small populations produced fewer cones but because the fraction of these cones that was fertile was much lower. Five of the nine smallest populations (<200 m) produced no fertile cones over the last 10 years. The number of seeds per fertile cone did not depend on population size. The results are discussed in relation to pollination biology.
对已知的所有古德氏班克木种群中的所有个体进行了种子产量评估。小种群每单位树冠面积产生的种子数量为零或仅有少量。在整个种群规模范围内，种群大小对单位面积种子产量和单株种子产量均有影响，这表明即使是大种群，种子产量可能仍未达到最大值。资源差异无法解释随着种群规模减小种子产量不成比例下降的现象，因为小种群和大种群之间在土壤性质以及林下或林冠覆盖方面并无差异。尽管小种群和大种群中的植株大小相似，但小种群中单株种子产量要低得多。这并非因为小种群中的植株产生的球果较少，而是因为这些球果中可育的比例要低得多。在过去10年中，9个最小种群（<200米）中有5个未产生可育球果。每个可育球果的种子数量并不取决于种群大小。结合传粉生物学对这些结果进行了讨论。
