Relatively short historical catch records show that anchovy populations have exhibited large variability over multi-decadal timescales.In order to understand the driving factors(anthropogenic and/or natural) of such v...Relatively short historical catch records show that anchovy populations have exhibited large variability over multi-decadal timescales.In order to understand the driving factors(anthropogenic and/or natural) of such variability,it is essential to develop long-term time series of the population prior to the occurrence of notable anthropogenic impact.Well-preserved fish scales in the sediments are regarded as useful indicators reflecting the fluctuations of fish populations over the last centuries.This study aims to validate the anchovy scale deposition rate as a proxy of local anchovy biomass in the Yellow Sea adjoining the western North Pacific.Our reconstructed results indicated that over the last 150 years,the population size of anchovy in the Yellow Sea has exhibited great fluctuations with periodicity of around 50 years,and the pattern of current recovery and collapse is similar to that of historical records.The pattern of large-scale population synchrony with remote ocean basins provides further evidence proving that fish population dynamics are strongly affected by global and basin-scale oceanic/climatic variability.展开更多
To investigate the genetic variation and population structure of Pacific herring in the Yellow Sea and the genetic differentiation between the Yellow Sea and the Sea of Japan, fragments of 479-bp mitochondrial DNA con...To investigate the genetic variation and population structure of Pacific herring in the Yellow Sea and the genetic differentiation between the Yellow Sea and the Sea of Japan, fragments of 479-bp mitochondrial DNA control region were sequenced for 110 individuals collected from three different periods in the Yellow Sea and one locality in the Sea of Japan. High haplotype diversity and moderate nucleotide diversity were observed in Pacific herring. AMOVA and exact test of population differentiation showed no significant genetic differentiations among the three populations of the Yellow Sea and suggested the populations can be treated as a single panmictic stock in the Yellow Sea. However, a large and significant genetic differentiation （ФST=0.11; P=0.00） was detected between the populations in the Yellow Sea and the Sea of Japan. The high sea water temperature in the Tsushima Strait was thought a barrier to block the gene exchange between populations of the two sea areas. The neutrality tests and mismatch distribution indicated recent population expansion in Pacific herring.展开更多
This article provides information on the phenomenon of alopecia in Japanese macaques, Macaca fuscata, in various environments and proposes a 3-step scoring system for a quantitative assessment of hair loss. Results su...This article provides information on the phenomenon of alopecia in Japanese macaques, Macaca fuscata, in various environments and proposes a 3-step scoring system for a quantitative assessment of hair loss. Results suggest that alopecia is commonly observed in Japanese macaques, with 20.5% of individuals showing head alopecia and 4.7% showing back alopecia across eight study groups. Alopecia was more commonly observed in adult females （30.8% individuals showing head alopecia and 15.3% showing back alopecia） than in other age-sex classes. Seasonal variation of back alopecia was noted, in particular, in- dividuals with patchy back hair were more frequently observed in winter than in summer. Seasonal variation was not observed in head hair. The distribution of alopecia was also different among study groups. The wild population generally had better hair con- dition than provisioned populations and captive populations. The present study used a non-invasive alopecia scoring system which can be a useful, rapid and non-invasive tool to monitor animal health and well-being at a population level展开更多
Typically, Japanese macaques are thought to avoid encountering other groups wherever possible. Intergroup relations between macaques on Shodoshima Island, however, appear exceptional. We show that neighboring groups o...Typically, Japanese macaques are thought to avoid encountering other groups wherever possible. Intergroup relations between macaques on Shodoshima Island, however, appear exceptional. We show that neighboring groups of Shodoshima mon-keys spent 32.8% of their active time in proximity to （〈100 m） and even foraged simultaneously at the same provisioning site with another group. The average duration and rate of intergroup encounters at Shodoshima （59.8 rain, 0.33 times/hour, n=269） were approximately ten times longer and 16.5 times more frequent than those at Jigokudani （6.1 rain, 0.02 times/hour, n--14）. Since both populations have similar provisioning and ecological conditions, such variation cannot be explained by the socioecol- ogy model alone. Compared with other populations of Japanese macaques, intergroup relations of Shodoshima monkeys are also characterized by more frequent neutral encounters, less frequent agonistic encounters, more frequent unsuccessful displacement, a lower intensity of aggression, and more frequent counter-aggression between groups. These characteristics suggest that intergroup relationships on Shodoshima Island are more tolerant than those in other Japanese macaque populations. This study reveals con- siderable differences in intergroup encounters within local populations of Japanese macaques living in similar environments, and emphasizes the role of social factors in such intra-specific variation [Current Zoology 58 （4）： 517-524, 2012].展开更多
基金supported by the National Basic Research Program (973 Program 2010CB428902)the National Natural Science Foundation of China (40876088)
文摘Relatively short historical catch records show that anchovy populations have exhibited large variability over multi-decadal timescales.In order to understand the driving factors(anthropogenic and/or natural) of such variability,it is essential to develop long-term time series of the population prior to the occurrence of notable anthropogenic impact.Well-preserved fish scales in the sediments are regarded as useful indicators reflecting the fluctuations of fish populations over the last centuries.This study aims to validate the anchovy scale deposition rate as a proxy of local anchovy biomass in the Yellow Sea adjoining the western North Pacific.Our reconstructed results indicated that over the last 150 years,the population size of anchovy in the Yellow Sea has exhibited great fluctuations with periodicity of around 50 years,and the pattern of current recovery and collapse is similar to that of historical records.The pattern of large-scale population synchrony with remote ocean basins provides further evidence proving that fish population dynamics are strongly affected by global and basin-scale oceanic/climatic variability.
基金Supported by the National Natural Science Foundation of China(No. 31061160187)Special Fund for Agro-scientific Research in the Public Interest (No. 200903005)Ocean University of China Students Innovation Trainning Program
文摘To investigate the genetic variation and population structure of Pacific herring in the Yellow Sea and the genetic differentiation between the Yellow Sea and the Sea of Japan, fragments of 479-bp mitochondrial DNA control region were sequenced for 110 individuals collected from three different periods in the Yellow Sea and one locality in the Sea of Japan. High haplotype diversity and moderate nucleotide diversity were observed in Pacific herring. AMOVA and exact test of population differentiation showed no significant genetic differentiations among the three populations of the Yellow Sea and suggested the populations can be treated as a single panmictic stock in the Yellow Sea. However, a large and significant genetic differentiation （ФST=0.11; P=0.00） was detected between the populations in the Yellow Sea and the Sea of Japan. The high sea water temperature in the Tsushima Strait was thought a barrier to block the gene exchange between populations of the two sea areas. The neutrality tests and mismatch distribution indicated recent population expansion in Pacific herring.
基金Acknowledgments The study was supported by the Hun- dred Scholar Program （090013） of Sun Yat-sen University in China, Fund-In-Aid of JSPS （P09103） and National Natural Science Foundation of China （31000175）. I am grateful to the Choshikei Monkey Park, the Takasakiyama Monkey Park, Jigokudani Monkey Park and Kyoto University for granting permission to carry out this research. I thank Mr Sam Hodgson from Tigress Productions for revising English. I thank all members of the Social Ecology Department and Center for Human Evolution Modeling Research at the Primate Research Institute, Kyoto University who gave helpful comments on the manuscript.
文摘This article provides information on the phenomenon of alopecia in Japanese macaques, Macaca fuscata, in various environments and proposes a 3-step scoring system for a quantitative assessment of hair loss. Results suggest that alopecia is commonly observed in Japanese macaques, with 20.5% of individuals showing head alopecia and 4.7% showing back alopecia across eight study groups. Alopecia was more commonly observed in adult females （30.8% individuals showing head alopecia and 15.3% showing back alopecia） than in other age-sex classes. Seasonal variation of back alopecia was noted, in particular, in- dividuals with patchy back hair were more frequently observed in winter than in summer. Seasonal variation was not observed in head hair. The distribution of alopecia was also different among study groups. The wild population generally had better hair con- dition than provisioned populations and captive populations. The present study used a non-invasive alopecia scoring system which can be a useful, rapid and non-invasive tool to monitor animal health and well-being at a population level
基金The study was supported by the Na- tional Natural Science Foundation of China （31000175）, the Grant-In-Aid from the Japan Society for the Promotion of Science （JSPS： P09103） and the Kiriyama Foundation of Ja-pan. We are grateful to the Choshikei Monkey Park and Jigo-kudani Monkey Park for granting permission to carry out this research, special thanks to Mr. Eishi Tokida for his kind aids in our study. We thank Dr. Andrew J. Macintosh for reading and commenting on a previous draft of this manuscript. We thank all members of the Anthropology Department, Sun Yat-sen University, China and the Social Ecology Department at the Primate Research Institute, Kyoto University, for their helpful comments on this research. The research and care of the monkeys under study abides by the national and institu- tional guidelines for the care and management of primates established by the Primate Research Institute, Kyoto Univer- sity, Japan.
文摘Typically, Japanese macaques are thought to avoid encountering other groups wherever possible. Intergroup relations between macaques on Shodoshima Island, however, appear exceptional. We show that neighboring groups of Shodoshima mon-keys spent 32.8% of their active time in proximity to （〈100 m） and even foraged simultaneously at the same provisioning site with another group. The average duration and rate of intergroup encounters at Shodoshima （59.8 rain, 0.33 times/hour, n=269） were approximately ten times longer and 16.5 times more frequent than those at Jigokudani （6.1 rain, 0.02 times/hour, n--14）. Since both populations have similar provisioning and ecological conditions, such variation cannot be explained by the socioecol- ogy model alone. Compared with other populations of Japanese macaques, intergroup relations of Shodoshima monkeys are also characterized by more frequent neutral encounters, less frequent agonistic encounters, more frequent unsuccessful displacement, a lower intensity of aggression, and more frequent counter-aggression between groups. These characteristics suggest that intergroup relationships on Shodoshima Island are more tolerant than those in other Japanese macaque populations. This study reveals con- siderable differences in intergroup encounters within local populations of Japanese macaques living in similar environments, and emphasizes the role of social factors in such intra-specific variation [Current Zoology 58 （4）： 517-524, 2012].
