2,527 research outputs found
Temperature-dependent recruitment delay of the Japanese glass eel Anguilla japonica in East Asia
No full textDIETARY CONDITIONS AND DIFFERENTIAL ACCESS TO FOOD RESOURCES AMONG THE VARIOUS CLASSES DURING THE HAN PERIOD
Full text linkIn this thesis, I study how food resources and dietary conditions were determined by social and economic status during the Han period in China, B.C. 206~A.D.220. Even though earlier scholars have published research concerning the Chinese food culture of this period, these studies were limited in that they only illustrated the dietary culture of the upper class or the available food resources in one geographic area. Also, without any persuasive data, it has been assumed by these earlier scholars that there were big differences in food resources and food consumption between the upper and lower classes. In this thesis, for comparison among the classes, I divide the social and economic classes into five stratified groups: nobles, officials, peasants, soldiers and convicts. After a brief introduction of the nature of each social class, I examine the food resources and nutritional condition of each group using information such as the wealth and income of each group, the market price of food resources, the agricultural products of peasants, and the amount of food distribution to soldiers and convicts. I found these data from archaeological remains, received historical records and pictorial data, and excavated texts. This research shows a broader view of Chinese dietary condition focusing not only on the variety of food resources of nobles, but also on the different food accessibilities among the officials, and the food deficiencies of peasants. It also deals with the situations of food supply for soldiers and convicts in an effort to reveal the true dietary consumption and nutritional conditions for all Chinese. This research proves that the various classes during the Han period in China had different food resources and dietary conditions
Molecular Cloning and Sequence Analysis of the cDNAs for Pituitary Glycoprotein Hormone α Subunits from Two Species of Synbranchiformes, Monopterus albus and Ophisternon bengalense
No full textThe sex ratios and growth strategies of wild and captive Japanese eels Anguilla japonica
No full textTime series analysis in the catch of Japanese glass eels: possible effects of the reproductive cycle and an El Ni?o event
No full textVariable habitat use by Japanese eel affects dissemination of swimbladder parasite Anguillicola crassus
No full textDoes variable habitat usage by the Japanese eel lead to population genetic differentiation?
No full textGrowth and habitat residence history of migrating silver American eels transplanted to Taiwan.
No full textSalinity preference of silvering Japanese eel Anguilla japonica: evidence from pituitary prolactin mRNA levels and otolith Sr:Ca ratios
No full textSex-dependent habitat use by the Japanese eel Anguilla japonica in Taiwan
No full textThe Japanese eel Anguilla japonica is a catadromous fish, but it has recently been discovered
that the use of freshwater habitat at the yellow eel stage is facultative. To determine if habitat
use by Japanese eels differs between the sexes we examined the strontium:calcium (Sr:Ca) ratios
in otoliths of 221 eels by electron probe micro-analyzer to reconstruct their environmental history.
Eels were collected from the Kaoping River estuary of southwestern Taiwan from 1998 through 2005.
The habitat use of yellow phase eels was divided into 3 types according to the life history pattern of
the otolith Sr:Ca ratios: Type 1 (freshwater resident), Type 2 (brackish water resident with a freshwater
preference) and Type 3 (brackish water resident with a seawater preference). Habitat use
differed significantly between male and female silver stage eels. Females were classified predominantly
as Type 2 or 3 while males were classified predominantly as Type 1 or 2. Consequently, female
yellow stage eels preferred an estuarine habitat while males preferred a freshwater habitat. In addition,
the mean otolith Sr:Ca ratios in the region 200 to 400 μm from the primordium (which corresponds
to the period of sex differentiation) were higher in females than in males. This indicated that
the sex differentiation of the eel might be related to habitat use, i.e. brackish water eels tended to differentiate
as females and freshwater eels as males
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