Prospect of mathematical ecology and ecological modeling Detection of chaos in natural population and its significance in the study of population dynamics Complexity of land ecosystem Time Series Analysis and Complex Dynamics of Mason Pine Caterpillar,Dendrolimus punctatus Walker (Lepidoptera Lasiocampidae) The Coupled Logistic Map Lattices of Describing Metapopulation dynamics Spatial chaos of metapopulation incurred by Allee effect,overcrowding effect and predation effect ECOLOGICAL COMPLEXITY——REVIEW AND PROSPECT Analysis of the growth characteristics of river algae based on chaos theory: a case study of Elbe River