EXPERIMENTAL STUDIES OF INTERSPECIES COMPETITION .1. COMPETITION BETWEEN POPULATIONS OF THE FLOUR BEETLES, TRIBOLIUM-CONFUSUM DUVAL AND TRIBOLIUM-CASTANEUM HERBST
EXPERIMENTAL STUDIES OF INTERSPECIES COMPETITION .1. COMPETITION BETWEEN POPULATIONS OF THE FLOUR BEETLES, TRIBOLIUM-CONFUSUM DUVAL AND TRIBOLIUM-CASTANEUM HERBST
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DOI：
10.2307/1948641
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发表时间：
1948-01-01
影响因子：
6.1
通讯作者：
PARK, T
中科院分区：
文献类型：
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作者：
PARK, T
本文对3卷培养基中保存的211个实验室粉甲虫（T. confusum和T. castaneum）种群的普查历史进行了4年左右的准确跟踪。每30天计数一次。这些种群中，有的只存在混淆蜱（对照），有的存在castaneum蜱（对照），有的存在两种蜱在竞争中同时存在（实验）。一定的控制和输出。培养物不含影响甲虫的孢子虫寄生虫（阿德琳娜）（无菌培养物）。这两个物种的单种对照种群都生长成功，并在研究期间保持了平衡。在没有寄生虫的情况下，castaneum的种群总数约为寄生虫存在时的2.5倍。T. confusum则没有受到如此大的影响。当这两种物种在竞争中生长时，其中一种必然会灭绝；这是竞争压力的直接结果。在寄生虫存在的情况下，castaneum在90%的时间内灭绝，而T. confusum在数量上成为正常的对照培养物。由于寄生虫的消失，这种趋势被逆转了，castaneum只有30%的时间灭绝。本文还讨论了产生这些观察到的人口趋势的因素之间的相互作用。
The census history of 211 laboratory populations of the flour beetles, T. confusum and T. castaneum, maintained in 3 volumes of medium was accurately followed for a period of about 4 yrs. with counts made every 30 days. Some of these populations consisted only of T. confusum (controls), others were T. castaneum (controls), and others contained both spp. together in competition (experimentals). Certain control and exptl. cultures were rendered free of a sporozoan parasite (Adelina) that affects the beetles (sterile-cultures). Single-species control populations of both spp. grew successfully and established equilibria that were maintained for the duration of the study. With the parasite absent, T. castaneum attained total populations about 2.5 times larger than with the parasite present. T. confusum was not so affected. When the 2 spp. were grown in competition, one of the 2 spp. invariably became extinct; a direct result of the competitive pressures. With the parasite present, T. castaneum becomes extinct about 90% of the time and T. confusum becomes normal control cultures in the quantitative sense. With the parasite absent, the trend is reversed, T. castaneum becoming extinct only about 30% of the time. A discussion is included about the interaction of factors that produce these observed population trends.