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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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非allee与allee竞争种群系统的动力学研究
, PP. 124-129
Keywords: allee效应,2-竞争种群,平衡态,竞争共存,竞争排斥
Abstract:
将allee效应引入2-竞争种群系统,建立了具有allee效应的2-竞争种群演化动态模型,对非allee与allee竞争种群系统演化进行动力学研究.模拟结果表明:①allee效应导致两竞争种群系统具有多个平衡态.②allee效应使竞争共存物种无法续存甚至全部灭绝,最终平衡态值随初始斑块占有率变化而变化.③allee效应可能使竞争排斥物种共同灭绝,且效应越强,物种存活时间越短;但allee效应不会增强强物种的竞争优势,反而可能使强物种变弱,弱物种变强,其具有与栖息地破坏类似的影响种群竞争等级排序的作用.④allee效应对种群续存是极不稳定的干扰因素,微小的变化都将引起系统平衡态的剧变.然而较高的初始斑块占有率也可能使原本濒于灭绝或竞争排斥的物种继续存活.
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