Understanding basic reproductive physiology is crucial for the management of both captive and free-ranging wolf. In the present study, we determined hormonal changes during pregnancy and the estrous cycle in captive f...Understanding basic reproductive physiology is crucial for the management of both captive and free-ranging wolf. In the present study, we determined hormonal changes during pregnancy and the estrous cycle in captive female wolf by measuring fecal steroids collected during the breeding season with high performance liquid chromatography （HPLC）. These biochemical analyses were validated using chemical devivatization and mass spectrometry, and interpreted along with the behavioral data. All four females undergoing estrus cycles were copulated with their partners and delivered pups successfully. We found that estradiol concen-trations were significantly higher during the estrus cycle than other stages （p0.01） and progesterone was also significantly increased throughout the pregnancy （p0.01）. These hormonal fluctuations demonstrated pregnancy-specific changes in the fecal progesterone and estradiol con-centrations. Patterns of fecal estradiol and progesterone concentrations during estrous cycles were similar to those reported for other canids.展开更多
In this paper, food habits of the wolf (Canis lupus) was determined in Inner Monolia, using scat analysis. Results indicated that ungulates were the staple food items(frequency 53.8%, relative biomass 85.2%). In the s...In this paper, food habits of the wolf (Canis lupus) was determined in Inner Monolia, using scat analysis. Results indicated that ungulates were the staple food items(frequency 53.8%, relative biomass 85.2%). In the scats, animals was 40.3% by the frequency of occurrence, and 75.7% by the relative biomass. Compared with the food habits of wolves in Heilongjiang Province, wolves showed a different pattern in prey selection in this ergion. In this study, we estimated the relative biomass of food items, and amount of each prey ingested by a wolf, based on a linear regression equation, y=2.76+0.02x(r=0.997), which was obtained in the feeding trials, It is suggerted that wolves are opportunistic predator. Some suggestions for wolf conservation and management were disussed.展开更多
This paper introduced the past and current situation about distribution and population of wolf (Canis Iupus) in different countries. Wolf once distributed widely in the world. lts distribution area has diminished grea...This paper introduced the past and current situation about distribution and population of wolf (Canis Iupus) in different countries. Wolf once distributed widely in the world. lts distribution area has diminished greatly as their living conditions are destroyed, together with persecution from humans. The overall population of wolf is also declining. ln some countries, wolves are endangered or even extinct. Now some countries have pIaced the woIf on the natjonal Iist of protected animals. Alaska of the United States and Canada are the widely distributed areas of wolves in the world.展开更多
基金This research was supported by Program for New Century Excellent Talents (NCET-07-0507)Shandong Province Natural Science Foundation (Z2008D01)+1 种基金Project of Science and Technology Development Plan in Shandong Province (2007GG2009011)Shandong Province Science Fund for Distinguished Young Scholars(2005BS02005, 2008BS09011)
文摘Understanding basic reproductive physiology is crucial for the management of both captive and free-ranging wolf. In the present study, we determined hormonal changes during pregnancy and the estrous cycle in captive female wolf by measuring fecal steroids collected during the breeding season with high performance liquid chromatography （HPLC）. These biochemical analyses were validated using chemical devivatization and mass spectrometry, and interpreted along with the behavioral data. All four females undergoing estrus cycles were copulated with their partners and delivered pups successfully. We found that estradiol concen-trations were significantly higher during the estrus cycle than other stages （p0.01） and progesterone was also significantly increased throughout the pregnancy （p0.01）. These hormonal fluctuations demonstrated pregnancy-specific changes in the fecal progesterone and estradiol con-centrations. Patterns of fecal estradiol and progesterone concentrations during estrous cycles were similar to those reported for other canids.
文摘In this paper, food habits of the wolf (Canis lupus) was determined in Inner Monolia, using scat analysis. Results indicated that ungulates were the staple food items(frequency 53.8%, relative biomass 85.2%). In the scats, animals was 40.3% by the frequency of occurrence, and 75.7% by the relative biomass. Compared with the food habits of wolves in Heilongjiang Province, wolves showed a different pattern in prey selection in this ergion. In this study, we estimated the relative biomass of food items, and amount of each prey ingested by a wolf, based on a linear regression equation, y=2.76+0.02x(r=0.997), which was obtained in the feeding trials, It is suggerted that wolves are opportunistic predator. Some suggestions for wolf conservation and management were disussed.
文摘This paper introduced the past and current situation about distribution and population of wolf (Canis Iupus) in different countries. Wolf once distributed widely in the world. lts distribution area has diminished greatly as their living conditions are destroyed, together with persecution from humans. The overall population of wolf is also declining. ln some countries, wolves are endangered or even extinct. Now some countries have pIaced the woIf on the natjonal Iist of protected animals. Alaska of the United States and Canada are the widely distributed areas of wolves in the world.
