Shachak Moshe, Brand Sol
The Jacob Blaustein Institute for Desert Research, Mitrani Center for Desert Ecology, Ben Gurion University of the Negev, Sede Boqer Campus, 84993, Israel.
Oecologia. 1988 Sep;76(4):620-626. doi: 10.1007/BF00397879.
We explore the demographic consequences of site selection by animals on their abundance among habitats. We found that pre and post settling survivorship are important links between the behavioral decisions where to settle and the distribution of a population among habitats. This was demonstrated for 10 generations of the desert isopod, Hemilepistus reaumuri, in three habitats in the Negev Desert, Israel. The populations exhibit low survivorship before settling (≈12%) and high survivorship (≈55%) after settling. According to our model this implies high site selection. Theoretical considerations and the case study led us to suggest the following relationship among settling, demography and habitat selection: 1) Individuals search for suitable settling sites to inhabit and reproduce. 2) Their decision where and when to settle is a cost benefit decision. They weigh the benefit of searching for a high quality site against mortality due to increased searching time. 3) The individual's decision to settle determines the pre and post settling survivorship pattern. 4) Survivorship pattern dictates density pattern in time and space. 5) Density pattern in a given habitat determines its quality for the individual. 6) Settling selection among habitats and the number of safe sites controls the distribution of densities among habitats.
我们探讨了动物栖息地选择对其在不同栖息地中数量的人口统计学影响。我们发现，定居前和定居后的存活率是决定在哪里定居的行为决策与种群在不同栖息地分布之间的重要联系。这在以色列内盖夫沙漠的三种栖息地中对沙漠等足类动物雷氏半蹼蝎（Hemilepistus reaumuri）的10代研究中得到了证明。这些种群在定居前存活率较低（约12%），而定居后存活率较高（约55%）。根据我们的模型，这意味着高度的栖息地选择。理论思考和案例研究使我们提出以下关于定居、人口统计学和栖息地选择之间的关系：1）个体寻找合适的定居地点以栖息和繁殖。2）它们决定何时何地定居是一个成本效益决策。它们权衡寻找高质量地点的好处与因搜索时间增加而导致的死亡率。3）个体的定居决定了定居前和定居后的存活模式。4）存活模式决定了时间和空间上的密度模式。5）给定栖息地中的密度模式决定了其对个体的质量。6）不同栖息地之间的定居选择和安全地点数量控制了不同栖息地之间的密度分布。
