Effects Of Spatial Heterogeneity On Food Retrieval Of Apodemus Agrarius And Lasiopodomys Brandtii

Spatial heterogeneity refers to a system or system properties on the spatial distribution of the complexity and variability.Spatial pattern is the specific construction form of spatial heterogeneity,and heterogeneity is the result of the natural environment,human activities,animal activity,endogenous succession of vegetation and the specific law of development of comprehensive effect.Ecological heterogeneity has an important influence on the population dynamics,community structure and the recovery process of ecological system,such as species diversity,population dynamics,life-history,diffusion modes,species coexistence,foraging behavior and natural selection mode.Therefore,it is the core issue to study the interaction between environmental heterogeneity and organism in present ecological studies.In the field,investigate food hoarding behavior of rodents,microhabitats of cache site and the relationship between the shrub distribution pattern and food storage,and simulate the field heterogeneous environment under the condition of laboratory.we choose Apodemus agrarius and Lasiopodomys brandtii as the experiment object,and study the effects of spatial heterogeneity on food retrieving of rodent.The main results are shown as follows:1)The microhabitats of food cache site include bare ground,rock edge,near treebase,shrub edge and under shrub.The percentage of seed hoarding in the shrub is up to 86.67% of the total cache site.The food that stored in the thickets is significantly higher than other habitat.The rodents did not spread and hoard food in random way,and preferred for hoard food at the edge of the brush and brush below,rarely cached in bare ground.And the rodents prefer to cache seeds(68.75%)in the grouped distribution of shrub,not the random distribution of shrub.2)Spatial complexity has a significant effect on food retrieving time of rodents and the frequency of exploring objects of rodents.The change trend of food retrieving time is similar,which increase with the increase of spatial complexity,but there are differences between Apodemus agrarius and Lasiopodomys brandtii.The food retrieving time in the blank condition is the shortest.The food retrieving time in the highest complexity is the longest.There are index relationship between the food retrieving time and spatial complexity.The food retrieving time increases with the increase of spatial complexity.There are index relationship between invalid dig and spatial complexity before food retrieving.The invalid dig before food retrieving increases with spatial complexity.3)Spatial variability has a significant effect on food retrieving time of rodents.The change trend of food retrieving time is similar,which decrease with the increase of spatial variability,but there are differences between Apodemus agrarius and Lasiopodomys brandtii.The food retrieving time in the the uniform distribution is the longest.The food retrieving time in the highest variability is the shortest.There are index relationship between the food retrieving time and spatial variability.The food retrieving time decreases with increases of spatial variability.There are index relationship between invalid dig and spatial variability before food retrieving.The invalid dig before food retrieving decreases with the increase of spatial variability.There is an index relationship between the frequency of exploring objects and spatial variability before food retrieving.The frequency of exploring objects decreases with the increases of spatial variability.In conclusion,the rodents do not spread and store food in random way,and prefer to store them at shrub edge and under shrub,rarely cache in bare ground.And the rodents prefer to cache food in the shrub of grouped distribution,not the shrub ofrandom distribution.Spatial heterogeneity has an effect on food retrieving of rodents.The food retrieving time,invalid dig before food retrieving and the frequency of exploring objects before food retrieving increase with the increase of spatial complexity.The food retrieving time,invalid dig before food retrieving and the frequency of exploring objects before food retrieving discrease with increasing spatial variability.This study analyze the relationship between spatial heterogeneity and food hoarding,and supplements the theoretical system of the relationship between plants and animals,and reveal the potential effects of spatial heterogeneity in forest regeneration,and provide theoretical guidance for vegetation restoration.