Does disturbance favor dispersal? An analysis of ant migration using the colony-based lattice model
Does disturbance favor dispersal? An analysis of ant migration using the colony-based lattice model
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DOI：
10.1016/j.jtbi.2007.05.012
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发表时间：
2007-09-21
影响因子：
2
通讯作者：
Tsuji, Kazuki
中科院分区：
文献类型：
--
作者：
Nakamaru, Mayuko;Beppu, Yayol;Tsuji, Kazuki
空间明确的模型，模拟扩散策略的演变没有考虑殖民生物。在这里，我们开发了基于殖民地的晶格模型，其中一个殖民地，而不是一个人，占据每个晶格网站。通过这个模型，我们研究了为什么入侵的流浪蚁物种通常缺乏长距离的传播，尽管生活在经常受到干扰的栖息地。我们假设在两个极端策略之间的竞争中，扩散距离和后代群体大小之间存在一个新的权衡：短距离扩散策略（S策略，模拟出芽或分裂），将一个群体分成两半，其中一半移动到相邻的位置，以及长距离扩散策略（L策略，假设由有翼蚁后建立殖民地），它将最小的资源分配给分散到随机选择的地点的后代殖民地。假设菌落的死亡率取决于大小; L策略由于初始菌落大小小而遭受成本（即，高死亡率和较晚的群体成熟）。干扰导致两种类型的菌落的额外死亡率，并由干扰频率p和确定干扰的空间自相关的随机参数q控制。仿真结果表明，S策略是青睐频繁，但空间小规模的干扰（高p和低q），而大规模的干扰（低p和高q）有利于L策略。当死亡率通常很高或在小菌落中特别高时，S策略往往是有利的。相反，当菌落死亡率通常较低时，L策略更受青睐。我们讨论了在蚂蚁和其他或多或少固着生物的扩散策略的进化中，菌落大小动态和菌落大小与扩散距离之间的权衡的重要性。(c)2007爱思唯尔有限公司保留所有权利。
Spatially explicit models that simulate the evolution of dispersal strategies have not considered colonial organisms. Here we develop the colony-based lattice model, in which a colony, rather than an individual, occupies each lattice site. With this model we investigate why invasive tramp ant species usually lack long-distance dispersal, despite living in frequently disturbed habitats. We assume a new trade-off between the dispersal distance and the offspring colony size in the competition between two extreme strategies: the short-distance dispersal strategy (the S strategy, simulating budding or fission), which splits a colony in half with one of the two halves moving to a neighboring site, and the long-distance dispersal strategy (the L strategy, assuming colony-founding by winged queens), which allocates a minimal resource to an offspring colony that disperses to a randomly chosen site. Mortality of a colony is assumed to depend on the size; the L strategy suffers from costs due to small initial colony size (i.e., high mortality and late colony maturity). Disturbance causes additional mortality to both types of colonies and is controlled by disturbance frequency, p, and a stochastic parameter determining the spatial autocorrelation of disturbance, q. Simulations show that the S strategy is favored under frequent but spatially small-scale disturbances (high p and low q), whereas large-scale disturbances (low p and high q) favor the L strategy. When mortality is generally high or particularly high in small colonies, the S strategy tends to be advantageous. In contrast, when colony mortality is generally low, the L strategy is favored. We discuss the importance of colony size dynamics and the trade-off between colony size and the dispersal distance in the evolution of dispersal strategies in ants and other more or less sessile organisms. (c) 2007 Elsevier Ltd. All rights reserved.