Beyond the fast-slow continuum: demographic dimensions structuring a tropical tree community.
Beyond the fast-slow continuum: demographic dimensions structuring a tropical tree community.
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DOI：
10.1111/ele.12974
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发表时间：
2018-07
期刊：
影响因子：
8.8
通讯作者：
N. Rüger;L. Comita;L. Comita;Richard Condit;Richard Condit;D. Purves;B. Rosenbaum;M. Visser;S. Wright;Christian Wirth;Christian Wirth
中科院分区：
文献类型：
--
作者：
N. Rüger;L. Comita;L. Comita;Richard Condit;Richard Condit;D. Purves;B. Rosenbaum;M. Visser;S. Wright;Christian Wirth;Christian Wirth
生活史理论认为，人口比率之间的权衡限制了可行的生活史策略的范围。对于共存的热带树种，最好的既定人口权衡是生长生存权衡。然而，令人惊讶的是，我们对生长和生存与繁殖措施的共变知之甚少。我们分析了282种共存的热带树木和灌木物种从种子到成年的人口统计率，包括生殖措施和个体发育。除了良好建立的快-慢连续体，我们确定了人口变化的第二个主要方面：招聘和幼苗性能与生长和生存的较大的个人（≥ 1厘米胸径）对应的“状态招聘”轴之间的权衡。这两个人口统计维度几乎与两个独立的特征维度（耐荫性和尺寸）完全一致。我们的研究结果补充了最近在全球范围内对植物生活史变化的分析，并揭示了人口权衡沿着多个轴作用于结构当地社区。
Life-history theory posits that trade-offs between demographic rates constrain the range of viable life-history strategies. For coexisting tropical tree species, the best established demographic trade-off is the growth-survival trade-off. However, we know surprisingly little about co-variation of growth and survival with measures of reproduction. We analysed demographic rates from seed to adult of 282 co-occurring tropical tree and shrub species, including measures of reproduction and accounting for ontogeny. Besides the well-established fast-slow continuum, we identified a second major dimension of demographic variation: a trade-off between recruitment and seedling performance vs. growth and survival of larger individuals (≥ 1 cm dbh) corresponding to a 'stature-recruitment' axis. The two demographic dimensions were almost perfectly aligned with two independent trait dimensions (shade tolerance and size). Our results complement recent analyses of plant life-history variation at the global scale and reveal that demographic trade-offs along multiple axes act to structure local communities.