| 1. | There is no need to regard density-dependent factors as having any special importance .
没有必要认为密度制约因素具有任何特殊的重要性。 |
| 2. | Probably density-independent factors are more important at the edge of the range of a species .
可能，在某物种的分布区的边缘，非密度制约因素最为重要。 |
| 3. | There are as well as density-dependent biological factors such as disease, predation, and intraspecific competition .
还有密度制约的生物因素，诸如病害、捕食和种内竞争等。 |
| 4. | The semigroup solution of a forest evolution system with density effect
具有密度制约作用的森林系统的半群解 |
| 5. | Density - dependent mortality
密度制约死亡率 |
| 6. | Global analysis of a ratio - dependent predator - prey system : a case for both prey and predator with density restrict
捕食与被捕食者均有密度制约的情况 |
| 7. | The aim of this work is to construct some predator - prey systems , to analyze the asymptotic behavior of these models and to study the effect of stage - structure and the density dependence on the populations
本文的主要目的是建立几个捕食者-食饵模型并研究这些模型的渐近性态以及阶段结构、密度制约对种群的影响。 |
| 8. | In chapter 3 , we give out lotka - volterra prey - predator model with density constraint and get the optimal harvesting policy that takes the maximum net rent as management purpose , when harvesting ability are limited or unlimited
第三章给出了有密度制约的lotka - volterra捕食者-食饵系统，当总捕获能力有限和无限时，以最大纯收益为管理目标的最优捕获策略。 |
| 9. | A system for the holling functional response with mutual interference and density dependence is considered , the existence and the stability of the positive equilibrium point of the system is discussed by using the theory and method of stability of ordinary differential equation
摘要讨论了一类既具有相互干扰又具有密度制约的捕食系统，得到系统正平衡点的存在性条件及全局稳定性的一些结果。 |
| 10. | In chapter two , we study a ratio - dependent predator - prey system . we consider the death rate of predator as the natural mortality rate and the other death rate caused by the intraspecies competition or other factors , i . e . , we consider the predator density dependence
对于捕食者的死亡率，我们不仅考虑了捕食者的自然死亡因素，而且还考虑了由于种内之间争夺资源及其它原因引起的死亡等因素，即考虑捕食者之间密度制约因素。 |
