The eggs of Tetrao parvirostris were artificially incubated in Huzhong area of Heilongjiang Province.The results showed that the average incubation rate of 377 eggs was 86.7%;the suitable temperature for artificial in...The eggs of Tetrao parvirostris were artificially incubated in Huzhong area of Heilongjiang Province.The results showed that the average incubation rate of 377 eggs was 86.7%;the suitable temperature for artificial incubation was 37.5℃;and the relative humidity was(60±5)%.The incubation lasted 24-26 d,and the weight loss ratio of artificially incubated eggs was 21.6%.The regression equation between egg weight and incubation days was Y=54.31-0.37X(γ=0.98).展开更多
The characteristics of digestive system,breeding habits,feather growth and molting of Tetrao parvirostris were studied,in order to provide the scientific basis for artificial breeding of T.parvirostris.
The digestive characteristics,wild feeding habits and food nutrients of Tetrao parvirostris were analyzed,in order to develop the feed that could meet the nutritional needs of T.parvirostris.
Background:Forest management affects the habitat conditions for many forest-dwelling species.Among them,the capercaillie(Tetrao urogallus)is a rare forest grouse inhabiting old,mature forests.We compared the structure...Background:Forest management affects the habitat conditions for many forest-dwelling species.Among them,the capercaillie(Tetrao urogallus)is a rare forest grouse inhabiting old,mature forests.We compared the structure of forest habitat among 9 active and 9 abandoned leks in the Augustow Forest(North-Eastern Poland),within a radius of 1 km of the leks,defined as the Key Areas for the capercaillie in lowland temperate forest.Habitat measurements were conducted on 1779 circular plots.Assessments made on all plots related to 13 habitat variables measured or noted in the field,including stand structure,canopy closure,stand developmental stage,percentage of Scots pine(Pinus sylvestris),soil fertility and soil moisture,the share of undergrowth,the cover of shrubs,the cover of bilberry(Vaccinium sp.),and the presence of certain habitat elements important to the capercaillie.Results:To compare the still-occupied and the abandoned KAs for the capercaillie,a logistic regression model was developed.The variables best explaining differences between these two categories were:the occurrence of undergrowth layers,canopy closure in the second canopy layer,and stand age.According to the model,with the increase of the shrub-layer cover as well as the density of trees,the probability of the presence of the capercaillie decreased.The capercaillie in the area of the Augustow Forest occupy mainly dry and poor,middle-aged,pinedominated forests,with a moderate extent of stand canopy closure and only weakly-developed layers of undergrowth.Conclusions:The filling-in of mature stands with sub-canopy trees and shrubs(the process which is stimulated by climate change and site eutrophication)causes structural changes,which are unfavourable to the capercaillie.This might explain why in the course of the recent decades the capercaillie has abandoned the oldest stands,distinguished by the presence of bigger shares of undergrowth.The capercaillie has shifted to younger stands,which reveal a lesser extent of canopy closure and a more limited development of understorey vegetation.展开更多
文摘The eggs of Tetrao parvirostris were artificially incubated in Huzhong area of Heilongjiang Province.The results showed that the average incubation rate of 377 eggs was 86.7%;the suitable temperature for artificial incubation was 37.5℃;and the relative humidity was(60±5)%.The incubation lasted 24-26 d,and the weight loss ratio of artificially incubated eggs was 21.6%.The regression equation between egg weight and incubation days was Y=54.31-0.37X(γ=0.98).
文摘The characteristics of digestive system,breeding habits,feather growth and molting of Tetrao parvirostris were studied,in order to provide the scientific basis for artificial breeding of T.parvirostris.
文摘The digestive characteristics,wild feeding habits and food nutrients of Tetrao parvirostris were analyzed,in order to develop the feed that could meet the nutritional needs of T.parvirostris.
文摘Background:Forest management affects the habitat conditions for many forest-dwelling species.Among them,the capercaillie(Tetrao urogallus)is a rare forest grouse inhabiting old,mature forests.We compared the structure of forest habitat among 9 active and 9 abandoned leks in the Augustow Forest(North-Eastern Poland),within a radius of 1 km of the leks,defined as the Key Areas for the capercaillie in lowland temperate forest.Habitat measurements were conducted on 1779 circular plots.Assessments made on all plots related to 13 habitat variables measured or noted in the field,including stand structure,canopy closure,stand developmental stage,percentage of Scots pine(Pinus sylvestris),soil fertility and soil moisture,the share of undergrowth,the cover of shrubs,the cover of bilberry(Vaccinium sp.),and the presence of certain habitat elements important to the capercaillie.Results:To compare the still-occupied and the abandoned KAs for the capercaillie,a logistic regression model was developed.The variables best explaining differences between these two categories were:the occurrence of undergrowth layers,canopy closure in the second canopy layer,and stand age.According to the model,with the increase of the shrub-layer cover as well as the density of trees,the probability of the presence of the capercaillie decreased.The capercaillie in the area of the Augustow Forest occupy mainly dry and poor,middle-aged,pinedominated forests,with a moderate extent of stand canopy closure and only weakly-developed layers of undergrowth.Conclusions:The filling-in of mature stands with sub-canopy trees and shrubs(the process which is stimulated by climate change and site eutrophication)causes structural changes,which are unfavourable to the capercaillie.This might explain why in the course of the recent decades the capercaillie has abandoned the oldest stands,distinguished by the presence of bigger shares of undergrowth.The capercaillie has shifted to younger stands,which reveal a lesser extent of canopy closure and a more limited development of understorey vegetation.
