Size-dependent survivorship in the web-building spiderAgelena limbata
Size-dependent survivorship in the web-building spiderAgelena limbata
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结网蜘蛛 Agelena Limata 的尺寸依赖性存活率
DOI：
10.1007/bf01875456
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发表时间：
1992
期刊：
影响因子：
2.7
通讯作者：
Koichi Tanaka
中科院分区：
文献类型：
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作者：
Koichi Tanaka
研究了被认为是食性受限的织网蜘蛛林巴蛛（agelena limbata）的阶段特异性死亡率和死亡因素，并研究了蜘蛛体型与3龄至成虫存活率的关系。卵囊期（卵、卵前期）和越冬期1若虫的死亡率较低。这一阶段的低死亡率部分是由于产妇护理减少了由捕食和/或非生物因素造成的死亡率。从1龄若虫出卵到繁殖，阶段特异性死亡率基本不变，为32 ~ 47%，时间特异性死亡率也基本不变。这些结果表明Deevey (1947) II型生存曲线inA。与其他关于流浪或穴居蜘蛛的报告相反，这些报告表明了III型曲线。若虫和成虫的重要死亡因素是被姬蜂寄生和被蜘蛛捕食。a的体型（甲壳宽度）差异很大。在田野里徘徊。较小的个体比较大的个体存活到下一阶段的几率更低。这一趋势对于生活在猎物可得性较差条件下的种群更为明显。林巴塔不太可能在战场上饿死，因为a的每一个阶段。在实验室里，林巴塔可以在饥饿中存活很长时间，平均可以存活22-65天。我认为这种蜘蛛的生存依赖于大小，这与较小的个体容易被寄生和被捕食有关。
Stage-specific mortality rates and mortality factors for the web-building spiderAgelena limbata, which is suggested to be food-limited, were studied, and the relationship between body size of spiders and survivorship for instar 3 to adults was examined. The mortality rate of the egg sac stage including eggs, deutova (prenymphal stage), and overwintering instar 1 nymphs was low. The low mortality of this stage was partly due to maternal care that reduced the mortality caused by predation and/or abiotic factors. From emergence of instar 1 nymphs from egg sacs to reproduction, the stagespecific mortality rates were almost constant, 32–47%, and the time-specific mortality rates were also constant. These results suggest a Deevey (1947) type II survivorship curve inA. limbata, in contrast to other reports on the wandering or burrowing spiders which suggested type III curves. Important mortality factors for nymphs and adults were parasitism by an ichneumonid wasp and predation by spiders. There were great variations in body size (carapace width) ofA. limbatain the field. Smaller individuals survived at a lower rate to the next stage than larger individuals. This tendency was clearer for the population living under poorer prey availability.A. limbatawas unlikely to starve to death in the field because every stage ofA. limbatacould survive starvation for a long time in the laboratory, 22–65 days on average. I suggest that the size-dependent survivorship of this spider is associated with vulnerability of smaller individuals to parasitism and predation.