Department of Math. and Stats., University of Calgary, 2500 University Drive N.W., Calgary, AB T2N 1N4, Canada.
Department of Math. and Stats., University of Calgary, 2500 University Drive N.W., Calgary, AB T2N 1N4, Canada; Department of Computer Science, City University of New York-College of Staten Island, The Graduate Center of City University of New York, 365 Fifth Avenue, New York 10314, United States.
J Theor Biol. 2019 Apr 7;466:106-118. doi: 10.1016/j.jtbi.2019.01.024. Epub 2019 Jan 25.
The paper explores the influence of harvesting (or culling) on the outcome of the competition of two species in a spatially heterogeneous environment. The harvesting effort is assumed to be proportional to the space-dependent intrinsic growth rate. The differences between the two populations are the diffusion strategy and the harvesting intensity. In the absence of harvesting, competing populations may either coexist, or one of them may bring the other to extinction. If the latter is the case, introduction of any level of harvesting to the successful species guarantees survival to its non-harvested competitor. In the former case, there is a strip of "close enough" to each other harvesting rates leading to preservation of the original coexistence. Some estimates are obtained for the relation of the harvesting levels providing either coexistence or competitive exclusion.
本文探讨了在空间异质环境中，收获（或剔除）对两种物种竞争结果的影响。假设收获力度与空间相关的内在增长率成正比。两个种群之间的差异在于扩散策略和收获强度。在没有收获的情况下，竞争种群可能共存，也可能其中一个将另一个灭绝。如果后者是这种情况，那么向成功物种引入任何水平的收获都会保证其未收获的竞争者的生存。在前一种情况下，存在一条彼此“足够接近”的收获率带，导致原始共存得以保留。对于提供共存或竞争排斥的收获水平关系，我们获得了一些估计。
