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Holling圆盘方程参数估计方法的研究 总被引:1,自引:0,他引:1
本文直接对Holling圆盘方程用最小二乘法,提出一种新的拟合方法——加权最小二乘法,并由此得到了Holling圆盘方程参数T_h,a′的估计式。比较结果表明:加权最小二乘法拟合结果较好,且拟合效果稳定,方便实用。 相似文献
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章金凤 《福建农林大学学报(自然科学版)》2011,(2):211-216
研究一类含有连续时滞的HollingⅢ功能性反应和扩散的三种群捕食-食饵模型,讨论了该模型的一致持久性,从而得到了保证该系统持久性的充分条件;通过构造适当的Lyapunov函数得到了保证此系统全局吸引的充分条件. 相似文献
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研究了一类具HollingII型功能性反应的捕食者一食饵系统非平凡周期解的存在性,其中捕食者种群具有密度制约,食饵种群服从Hallam增长,得到了存在正周期解的充分性条件. 相似文献
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研究一类具有HollingⅡ类功能反应和捕食者、食饵均具有阶段结构的两种群捕食系统,得到了系统的一致持久性和周期系统存在唯一全局渐近稳定的周期解的充分条件. 相似文献
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研究了具有HollingⅡ类型功能反应的一捕食者有两种食饵的时滞扩散系统,得到了与时滞有关的系统永久持续生存的充分条件,通过构造Lyapunov函数得到了与时滞有关的系统全局渐近稳定的充分条件. 相似文献
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Leroy SORIA‐DÍAZ Mike S. FOWLER Octavio MONROY‐VILCHIS Daniel ORO 《Integrative zoology》2018,13(1):84-93
The study of predator–prey interactions is commonly analyzed using functional responses to gain an understanding of predation patterns and the impact they have on prey populations. Despite this, little is known about predator–prey systems with multiple prey species in sites near the equator. Here we studied the functional response of cougars (Puma concolor) in relation to their main prey, armadillo (Dasypus novemcinctus), coati (Nasua narica) and white‐tailed deer (Odocoileus virginianus). Between 2004 and 2010, cougar scats were collected along 5 transects to estimate the consumption of different prey species. A relative abundance index (RAI) was calculated for each prey species and cougar using 18 camera traps. We compared Holling type I, II and III functional response models to determine patterns in prey consumption based on the relative abundance and biomass of each prey species consumed. The 3 main prey species comprised 55% (armadillo), 17% (coati) and 8% (white‐tailed deer) of the diet. Type I and II functional responses described consumption of the 2 most common prey species armadillos and coati similarly well, while a type I response best characterized consumption of white‐tailed deer. A negative correlation between the proportions of armadillo versus coati and white‐tailed deer biomass in cougar scats suggests switching to consume alternative prey, confirming high foraging plasticity of this carnivore. This work represents one of the few studies to compare functional responses across multiple prey species, combined with evidence for prey‐switching at low densities of preferred prey. 相似文献
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具有连续时滞的Holling Ⅲ功能性反应捕食系统的持久性和全局吸引性 总被引:2,自引:2,他引:0
赖尾英 《福建农林大学学报(自然科学版)》2009,38(2)
讨论了一类具有连续时滞的Holling Ⅲ功能性反应的两种群捕食-食饵系统,利用微分方程比较定理得到保证此系统持久性的充分性条件;通过构造适当的Lyapunov函数的方法,得到了保证此系统全局稳定的充分条件. 相似文献