[Optimizing MaxEnt model in the prediction of species distribution.].

Maximum Entropy (MaxEnt) model has been widely used in recent years. However, MaxEnt is highly inclined to produce misleading results if it is not well optimized. We summarized the researches about the model optimization for sampling bias correction, model complexity tuning, presence-absence threshold selection, and model evaluation.

[Blood biochemical indices of female red-crowned crane (Grus japonensis) in Zhalong Nature Reserve of Heilongjiang Province, Northeast China].

From November 2004 to October 2005, twenty blood biochemical indices, i. e., total protein, serum albumin, serum globulin, total bilirubin, direct bilirubin, indirect bilirubin, blood glucose, serum urea nitrogen, serum creatine, total cholesterol, triglyceride, aspartate amino transferase, alanine amino transferase, alkaline phosphatase, serum creatine kinase, hydroxybutyrate dehydrogenase, lactic dehydrogenase, serum calcium ion, inorganic phosphate, and magnesium ion, of 10 female Grus japonensis adults in their wintering, reproduction, and migration periods in Zhalong Nature Reserve were analyzed by automatic biochemical analyzer.

[Forage habitat selection of white-naped crane during its incubation period in Zhalong wetland].

By using the methods of fixed-spot observation, GPS positioning, sampling plot investigation, and factor analysis, the forage habitat selection of white-naped crane (Grus vipio) during its incubation period in Zhalong Wetland was studied from April to May 2002-2008. In the study area, the crane during its incubation period chose a variety of habitat types as its forage habitat, among which, wetland (reed swamp) was the main one, occupying 74. 36% of the total, followed by farmland.