Relationship Between The Population Fluctuation Of Marsh Tit And The Climate Change In Maoer Mountain

There are two hypotheses that currently affect the change in the number of bird populations in the climate factor.The tub hypothesis suggests that the non-breeding climate regulates the population by indirectly acting on the individual mortality rate.The tap hypothesis considers the climate during the breeding season to be directly affected by the survival rate Adjust the number of populations.Both hypotheses have been supported by recent research results at home and abroad,but the accurate assessment of the relationship between climate and bird population needs to be further studied.The population of this project is from the marsh tits of the Maoer Mountain Experimental Forest Farm in Shangzhi City,Heilongjiang Province.The population data are from the data of the Sheikh Mountain Birds Central Station from 1999 to 2016.The weather data are from the Shangqi Weather Station.The growth rate of the marsh tits And the reduction rate and the same period of temperature,precipitation,relative humidity and other climatic factors for data analysis,the population change rate of the main impact of climate factors.During the period from 1999 to 2016,the number of marsh marshes in the area was decreasing,and the number of marsh tits was decreasing.The growth rate of the marsh tits was the ratio of the number of populations in the autumn to the number of spring populations,with an average of 4.17.The reduction rate was the ratio of the number of stocks in the autumn and the number of the next spring.The results of principal component analysis show that the average temperature value in August and the precipitation in March are related to the growth rate of marsh tits.The results of stepwise regression analysis showed that the main factors affecting the growth rate of marsh tits were the relative humidity in March(P = 0.227)and the relative humidity in April(P = 0.205).The relative humidity value is affected by the combined effect of temperature and precipitation.The low temperature and high humidity environment increases the incidence of disease and increases the heat radiation and convective heat dissipation between birds and air,resulting in decreased body temperature.The number of individual deaths increased under the dual effects of disease and body temperature reduction,and therefore the population growth rate decreased.The results of principal component analysis show that the October precipitation and the lowest temperature in February are related to the reduction rate of marsh tits.The results of stepwise regression analysis showed that the main factors affecting the reduction rate of marsh tits were the relative humidity(P = 0.416)and the relative humidity in October(P = 0.403).The relative humidity value is affected by the combined effect of temperature and precipitation.The low temperature and high humidity environment increases the incidence of disease and increases the heat radiation and convective heat dissipation between birds and air,resulting in decreased body temperature.The number of individual deaths increased under the dual effects of disease and body temperature reduction,and therefore the population reduction rate increased.This study basically shows that the climate change in the non-breeding period has a great influence on the population change of the marsh tits,which is in line with the tub hypothesis,that is,the change of the number of the marsh tits is more affected by the non-breeding climate change...