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Growth and Diet Utilization Efficiencies of Overwinter Juvenile Mud Crabs Fed with Different Diets
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作者 Shengping ZHONG Yan JIANG +6 位作者 Changzi GE Xiaohui CAI Jianda SONG Yonghong LIU Lianghua HUANG Yinhui PENG Guoqiang HUANG 《Asian Agricultural Research》 2024年第11期36-43,共8页
[Objectives]To study the utilization efficiency of different diets for juvenile Scylla paramamosain.[Methods]Low-value fish,shrimp,clam and clamworm were fed to overwintering young mud crabs,and the performance of the... [Objectives]To study the utilization efficiency of different diets for juvenile Scylla paramamosain.[Methods]Low-value fish,shrimp,clam and clamworm were fed to overwintering young mud crabs,and the performance of the feed was evaluated by growth,feed utilization and energy allocation.[Results]Shrimp-fed mud crabs showed the best growth performance,while fish-fed mud crabs showed the worst growth performance and converted the least protein and energy for growth.Shrimp-fed mud crabs molted more frequently,and the dry matter mass and energy of Exuviation were significantly higher than those of fish-fed mud crabs.The shrimp-fed crabs also had significantly higher food intake than those fish-fed crabs.The order of feed conversion efficiency(FCE)of fish-fed mud crabs was Polychaete>clam>shrimp>fish,while the order of FCE calculated with FCE-P and FCE-E was Polychaete>clam>shrimp>fish.Fish-fed mud crabs had the least energy intake and the least energy for growth,molting,excretion,metabolism,and feces.Among the four treatments,the mud crabs fed on Polychaete had the largest proportion of energy used for growth,while the mud crabs fed on fish had the largest proportion of energy used for molting.The proportion of energy consumed by mud crabs fed on Polychaete was the smallest,which may be the main reason for the higher FCE-P and FCE-E of mud crabs fed on Polychaete.[Conclusions]The results of this experiment showed that the utilization of low-value fish by mud crabs was the worst,suggesting that fish should not be used as control or reference food when studying the formula feed of mud crabs. 展开更多
关键词 Mud crab(Scylla paramamosain) Natural feed GROWTH Feed conversion efficiency(FCE) Energy allocation
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Integrated Rice-Based Shrimp and Crabs Farming: Adaptation to Climate Change and Potential Mitigation of Global Warming in the Coastal Wetlands of Bangladesh
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作者 Muhammad Aslam Ali Shahroz Mahean Haque +7 位作者 Khalid Sohrawardi S. K. Fazlay Rabbi Shuvo Kumar Sarkar Hafsa Jahan Hiya Fakir Azmol Huda Sumon Malakar Mahjabeen Rahman Md. Shakir Ahammed 《Journal of Agricultural Chemistry and Environment》 2023年第3期223-237,共15页
Coastal agriculture is vulnerable to climate change, thereby may affect food production systems and food security in Bangladesh. Methane (CH4) emission from coastal wetlands rice farming is a major environmental conce... Coastal agriculture is vulnerable to climate change, thereby may affect food production systems and food security in Bangladesh. Methane (CH4) emission from coastal wetlands rice farming is a major environmental concern due to its global warming potential. Therefore, field experiments were conducted at the southern coastal region of Shyamnagar, Satkhira, to investigate the feasibility of Rice-Shrimp and Rice-Crabs mixed farming for adaptation to the changing climate and sustaining food production system. The experimental treatments were designed on rice-based diversified farming systems such as rice sole cropping with no NPKS + no soil amendments (T1), rice sole cropping following farmers’ practice (FP) without soil amendment (T2), rice sole cropping following FP with phosphogypsum (PG) amendment (T3), Rice-Shrimp mixed culture with PG amendment (T4), Rice-Crabs mixed culture with PG amendment (T5), Rice-Shrimp mixed culture + PG amendment with Spirulina (Cyanobacteria) inoculation (T6), and Rice-Crabs mixed culture + PG amendment with Spirulina inoculation (T7). A closed chamber technique was followed to collect gas samples from the rice paddy field and samples were analyzed by Gas Chromatograph. It was found that Rice-Shrimp (T6) and Rice-Crabs mixed farming (T7) practices significantly decreased GWPs compared to the rice sole cropping system. In the dry boro season, the maximum GWPs 4175 kg CO<sub>2</sub> eq. ha<sup>-1</sup> was recorded from rice sole cropping (T2), which was decreased by 30% and 36.7% under Rice-Shrimp (T6) and Rice-Crabs (T7) mixed farming practices, respectively. Furthermore, in the wet aman season, maximum GWP 4525 kg CO<sub>2</sub> eq. ha<sup>-1</sup> was recorded from rice sole cropping (T2), which was decreased by 33.0% and 38.8% under Rice-Shrimp and Rice-Crabs mixed farming, respectively. Rice grain yield was low under rice sole cropping (3500 kg/ha), which was increased by 11.0% and 14.7% under Rice-Shrimp mixed farming amended with PG and Spirulina (T6) during wet aman and dry boro seasons, respectively. The postharvest soil properties, such as soil organic matter content, redox potential value (Eh), and exchangeable K<sup>+</sup> and Ca<sup>2+</sup>, contents in soil increased significantly with Phosphogypsum and Spirulina applications, however, decreased Na<sup>+</sup> content and electrical conductivity (EC) eventually improved rice plants’ tolerance to salinity and enhanced overall productivity of Rice-Shrimp and Rice-Crabs mixed farming. Conclusively, the conversion of wetland mono rice cropping into mixed Rice-Shrimp and Rice-Crabs farming would be a feasible strategy to sustain rice aquaculture-based farming, ensure food security and mitigate GWPs in coastal wetlands ecosystem. 展开更多
关键词 Coastal Paddy SHRIMP crabs SPIRULINA GWPs
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拟南芥心皮发育CRABS CLAW基因的克隆与荠菜遗传转化 被引量:5
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作者 赵燕 张学文 蒋向 《湖南农业大学学报(自然科学版)》 CAS CSCD 北大核心 2007年第1期14-17,共4页
CRABS CLAW(CRC)是控制拟南芥心皮发育的主要基因之一,属MADS box基因家族中的成员.根据GenBank收录的CRABS CLAW基因的cDNA序列设计引物,通过RT-PCR的方法,从哥伦比亚型拟南芥总RNA中扩增出CRABS CLAW基因的全长cDNA片段,将其克隆到pMD... CRABS CLAW(CRC)是控制拟南芥心皮发育的主要基因之一,属MADS box基因家族中的成员.根据GenBank收录的CRABS CLAW基因的cDNA序列设计引物,通过RT-PCR的方法,从哥伦比亚型拟南芥总RNA中扩增出CRABS CLAW基因的全长cDNA片段,将其克隆到pMD18-T载体中,经测序证明该片段与GenBank报道的序列完全一致.以Ti质粒载体pWM101为基础,构建了由组成型启动子CaMV35S调控的CRC基因的植物表达载体pWM101-CRC,通过根癌农杆菌花序浸渍法转化荠菜,获得了转CRC基因的荠菜植株.CRC基因在荠菜中的组成型表达对荠菜心皮形态和大小都产生了一定影响. 展开更多
关键词 拟南芥 CRAB SCLAW基因 荠菜 转化
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Male horseshoe crabs Limulus polyphemus use multiple sensory cues to locate mates 被引量:3
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作者 Katharine M.SAUNDERS H.Jane BROCKMANN +1 位作者 Winsor H.WATSON Ⅲ Steven H.JURY 《Current Zoology》 SCIE CAS CSCD 北大核心 2010年第5期485-498,共14页
The use of multisensory cues to locate mates can increase an organism's success by acting as a back-up plan when one system fails, by providing additional information to the receiver, and by increasing their ability ... The use of multisensory cues to locate mates can increase an organism's success by acting as a back-up plan when one system fails, by providing additional information to the receiver, and by increasing their ability to detect mates using senses that have different ranges in a variable aquatic environment. In this contribution we review the sensory cues that male horseshoe crabs Lirnulus polyphemus are known to use when locating mates and then provide new data that shed light on this subject. Dur- ing the breeding season, females migrate into shore during high tides to spawn. Males attach to females as they approach the beach or are attracted to pairs already spawning. Vision is well established as an important cue in attracting males. Although chemoreception is well known in other marine arthropods, and horseshoe crabs have the anatomy available, there are few studies on chemical cues in this species. Experiments are presented here that provide evidence for chemical cue use. We show that the attraction, and retention, of attached and satellite males to actively spawning females and mating pairs involves multimodal cues 展开更多
关键词 Multimodal communication Horseshoe crabs Sensory system Mating cues
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Flow cytometric analysis of DNA content for four commercially important crabs in China 被引量:1
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作者 LIU Lei CUI Zhaoxia +3 位作者 SONG Chengwen LIU Yuan HUI Min WANG Chunlin 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2016年第6期7-11,共5页
The genome size(C-value) of an organism is referring to the DNA content of its non-replicated haploid chromosome complement,generally deduced from measuring somatic diploid nuclei.We presented genome size(C-value)... The genome size(C-value) of an organism is referring to the DNA content of its non-replicated haploid chromosome complement,generally deduced from measuring somatic diploid nuclei.We presented genome size(C-value) data obtained by flow cytometry for four commercially important crabs(Portunus trituberculatus,Charybdis japonica,Scylla paramamosain,and Eriocheir sinensis) common in the coast of China.Gallus domesticus(2C=2.5 pg) was used as the internal standard.The results showed that the C-value for P.trituberculatus,C.japonica,S.paramamosain,and E.sinensis were(2.31±0.01) pg,(2.33±0.03) pg,(1.64±0.02) pg,and(2.29±0.03) pg,respectively.The C-value of P.trituberculatus,C.japonica and S.paramamosain were reported for the first time.The data represented by the four species indicated that they had lower DNA contents than average DNA values in crustaceans((4.99±0.48) pg),and three of the four values were very similar if not identical.The results provide useful data for future studies in the fields of biodiversity,species conservation,and phylogeny of these commercial crabs.They will also be helpful in instructing the hybridization breeding program and estimating the cost of the whole genome sequencing project. 展开更多
关键词 genome size flow cytometry crabs PORTUNIDAE GRAPSIDAE
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Effect of Anthocidaris crassispina Enhancement on the Behavior of Shrimps and Crabs
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作者 聂永康 周治刚 +5 位作者 李勇 陈丕茂 黄泽强 洪洁漳 谢学东 李辉权 《Agricultural Science & Technology》 CAS 2016年第11期2636-2641,共6页
[Objective] The aim was to study the influence of Anthocidaris crassispina enhancement on the behaviors of wild shrimps and crabs. [Method] Simulation ex- periments were carried out in the laboratory to study the effe... [Objective] The aim was to study the influence of Anthocidaris crassispina enhancement on the behaviors of wild shrimps and crabs. [Method] Simulation ex- periments were carried out in the laboratory to study the effects of A. crassispina enhancement on the behaviors of wild shrimps and crabs. [Result] Penaeus japoni- cus, Penaeus monodon and Metapenaeus affinis could coexist with A. crassispina, and A. crassispina had a certain attraction to Penaeus japonicus, but no harm oc- curred. There were neither behavioral effects nor hazards between Portunus san- guinolentus and A. crassispina. Portunus trituberculatus and Charybdis feriatus might cause some harm to A. crassispina when their quantity was large, but it was not a common phenomenon. [Conclusion[ This research provided references for the bio- logical behavioristics and the further development of ecological risk assessment of A. crassispina enhancement. 展开更多
关键词 Anthocidaris crassispina SHRIMPS crabs BEHAVIORS ENHANCEMENT
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Life Stage, Gender and Movement of Blue Crabs (Callinectes sapidus) in Lake Mattamuskeet and Connecting Canals 被引量:1
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作者 Julia Chen Rinaldi James Hench +2 位作者 M.Zachary Darnell Matthew Kukurugya Daniel Rittschof 《Journal of Fisheries Science》 2019年第2期7-19,共13页
In their ranges on east and south coasts of the Americas as well as their established invasions in the Adriatic and Baltic,blue crabs,Callinectes sapidus,inhabit estuaries,sounds and coastal oceans and are commerciall... In their ranges on east and south coasts of the Americas as well as their established invasions in the Adriatic and Baltic,blue crabs,Callinectes sapidus,inhabit estuaries,sounds and coastal oceans and are commercially and ecologically important.How crabs move in response to physical variables is important to management.We monitored life stages at canal control structures,assessed gender ratios with recreational crabbing,learned from crabbers,and studied movements of tagged crabs in a canal connecting Lake Mattamuskeet to the Pamlico sound.Juveniles enter the lake through two of 4 canals connecting to the sounds.Females migrate out through one canal.The lake standing population is about 70% male.Movements of 240 crabs in August 2012 and 102 crabs in October 2014 were quantified using RFID tags with co-located meteorological and oceanographic devices.Non-spawning females and males are nomadic.Crabs released in the canal move in response to changes in water depth and go with the flow,toward the Pamlico Sound(summer 76% and fall 78%).What crabbers describe as a fall migration appears to be concentration of crabs in warmer deeper canals and then southern movement with flow generated by strong north winds.To be effective,management strategies like migratory corridors require understanding of crab movements. 展开更多
关键词 crabs METEOROLOGY OCEANOGRAPHY MOVEMENT FORAGING Migration RFID Tagging Life History
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Implementing geostatistical analysis to study spatio-temporal distribution patterns of swimming crabs(Portunus trituberculatus)
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作者 Wenbin Zhu Kaner Lu +6 位作者 Zhanhui Lu Qian Dai Zhenghua Li Yongdong Zhou Siqi Huang Haichen Zhu Guocheng Cui 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2021年第6期67-74,共8页
This study attempted to compare the performance of local polynomial interpolation,inverse distance weighted interpolation,and ordinary kriging in studying distribution patterns of swimming crabs.Cross-validation was u... This study attempted to compare the performance of local polynomial interpolation,inverse distance weighted interpolation,and ordinary kriging in studying distribution patterns of swimming crabs.Cross-validation was used to select the optimum method to get distribution results,and kriging was used for making spatial variability analysis.Data were collected from 87 sampling stations in November of 2015(autumn)and February(winter),May(spring)and August(summer)of 2016.Results indicate that swimming crabs widely distributed in autumn and summer:in the summer,they were more spatially independent,and resources in each sampling station varied a lot;in the winter and spring,the abundance of crabs was much lower,but the individual crab size was bigger,and they showed the patchy and more concentrative distribution pattern,which means they were more spatially dependent.Distribution patterns were in accordance with ecological migration features of swimming crabs,which were affected by the changing marine environment.This study could infer that it is applicable to study crab fishery or even other crustacean species using geostatistical analysis.It not only helps practitioners have a better understanding of how swimming crabs migrate from season to season,but also assists researchers in carrying out a more comprehensive assessment of the fishery.Therefore,it may facilitate advancing the implementation in the pilot quota management program of swimming crabs in northern Zhejiang fishing grounds. 展开更多
关键词 swimming crabs(Portunus trituberculatus) geostatistical analysis ordinary kriging spatio-temporal distributions Zhejiang coastal waters of China
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Cloning of CRABS CLAW Gene from Brassica napus and Construction of Its RNA Interference Expression Vector
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作者 Xiaoying ZHOU Sanxiong FU +2 位作者 Song CHEN Chao ZHANG Cunkou QI 《Agricultural Biotechnology》 CAS 2016年第1期11-14,18,共5页
CRABS ClAW (CRC) is a member of the YABBYA transcription factor gene family that plays an important role in floral organ development of plants. This study aimed to further investigate the regulatory function of CRC ... CRABS ClAW (CRC) is a member of the YABBYA transcription factor gene family that plays an important role in floral organ development of plants. This study aimed to further investigate the regulatory function of CRC transcription factor in the development of floral organs of rape (Brassica napus L. ). A 580 bp fragment of CRC gene was cloned by RT-PCR from total RNA of buds of rape cultivar Ningyou No. 10 to construct an inverted repeated expression cassette of CRC gene using intermediate vector pHturieane. Firstly, CRC gene fragment was positively inserted into the 5' end of a spliceable intron and negatively inserted into the 3' end of the intron. Subsequently, CaMV35S promoter sequence and inverted repeated expression cassette of CRC gene were transferred into pUC18 multiple clone site of binary expression vector pCAMBIAI1390. The constructed interference expression vector was named pA6-CRCi, which was further confirmed by restriction enzyme digestion and sequencing. 展开更多
关键词 wBrassica napus L. crabs CLAW gene RNA interference expression vector
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Microalgal Epibiontic Communities on Some Brachyuran Crabs in Suez Canal, Egypt
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作者 Nesreen K. Ibrahim Abeer S. Amin 《Journal of Life Sciences》 2013年第5期517-526,共10页
The microalgal epibiontic communities of the brachyuran crabs Dorippe quadridens, Schizophrys aspera and Hyastenus hilgendorfi were studied during spring and summer of 2011. A total of 68 microalgal species of four ph... The microalgal epibiontic communities of the brachyuran crabs Dorippe quadridens, Schizophrys aspera and Hyastenus hilgendorfi were studied during spring and summer of 2011. A total of 68 microalgal species of four phyla (Chlorophyta, Bascillariophyta, Cyanophyta and Pyrrhophyta) was recorded in the epibiosis of the investigated brachyuran crabs males and females Generally, Bascillariophyta predominate in number of species over the other microalgal groups, followed by Cyanophyta and Pyrrhophyta, while Chlorophyta was represented by the lowest number of species. Highly percentage of occurrence of microalgal epibionts was observed on the dorsal part of the investigated crabs followed by chela and ventral parts. 展开更多
关键词 Brachyuran crabs microalgal epibiontic communities Bitter lakes Suez canal.
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Special Dish: Steamed Crabs
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《China Today》 2000年第4期57-57,共1页
关键词 Special Dish Steamed crabs
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Seasonal movements of American horseshoe crabs Limulus polyphemus in the Great Bay Estuary,New Hampshire (USA) 被引量:7
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作者 Susanne Y SCHALLER Christopher C.CHABOT Winsor H.WATSON Ⅲ 《Current Zoology》 SCIE CAS CSCD 北大核心 2010年第5期587-598,共12页
The goal of this study was to determine the year round movement patterns of American horseshoe crabs, Limulus polyphemus, in the Great Bay Estuary, New Hampshire (USA) by using acoustic telemetry to track the moveme... The goal of this study was to determine the year round movement patterns of American horseshoe crabs, Limulus polyphemus, in the Great Bay Estuary, New Hampshire (USA) by using acoustic telemetry to track the movements of 37 adult Limulus, for periods ranging from 2 to 31 months. During the winter (December-March) horseshoe crabs moved very little. In the spring, when water temperatures exceeded II^C, horseshoe crabs moved at least 1 km further up into the estuary to shallower subtidal areas about a month prior to spawning. The mean distance traveled during spring migrations was 2.6 + 0.5 (n=20) km up the estuary. Mating occurred in May and June and during these months animals spent most of their time in shallow subtidal areas adjacent to mating beaches. In the summer (July-Augnst), animals moved 1.5 ± 0.5 (n=26) km down the estuary, towards the ocean, and ranged widely, using extensive portions of the estuary. In the fall (September-November) movement was more limited (0.5 ± 0.5 km; n = 24) while animals settled into wintering locations, where they remained until spring. The mean annual linear range for all animals was 4.5 ± 0.3 km (n =35) and the maximum distance traveled by an individual horseshoe crab within one year was 9.2 km. There was no evidence that any of the horseshoe crabs tracked during this study left the estuary 展开更多
关键词 Limuluspolyphemus Acoustic telemetry Horseshoe crab TRACKING ESTUARY Home range
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Using Sr isotopes to trace the geographic origins of Chinese mitten crabs 被引量:7
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作者 Hao-Ming Yin Fang Huang +1 位作者 Jun Shen Hui-Min Yu 《Acta Geochimica》 EI CAS CSCD 2020年第3期326-336,共11页
Identifying the geographic origins of Chinese mitten crabs is important for food safety and fair market competition.In this study,we used strontium(Sr) isotopes as a tool to trace the geographic origins of Chinese mit... Identifying the geographic origins of Chinese mitten crabs is important for food safety and fair market competition.In this study,we used strontium(Sr) isotopes as a tool to trace the geographic origins of Chinese mitten crabs.Chinese mitten crabs,water,and different types of crab feed were collected from four different lakes for Sr isotope analyses.The results showed that the Sr isotope compositions of the different parts from one single crab were consistent within error,indicating that any piece of a crab could be used to represent the Sr isotope characteristics of the whole crab.The Sr isotope compositions of Chinese mitten crabs from the same lake were consistent within the analytical error,and the values were similar to the Sr isotope composition of the water from the same lake.However,the Sr isotope compositions of water and crabs from different lakes are significantly different.Therefore,the Sr isotope compositions of Chinese mitten crabs are mainly controlled by lake water composition,while the impact of feed is limited.This study provides an effective method for tracing the geographic origins of Chinese mitten crabs. 展开更多
关键词 Chinese mitten crab LAKES Sr isotopes Geographic origin
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Mitochondrial Genome of Episesarma lafondii(Brachyura:Sesarmidae)and Comparison with Other Sesarmid Crabs 被引量:5
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作者 ZHANG Ying GAO Yan +6 位作者 GONG Li LU Xinting JIANG Lihua LIU Bingjian LIU Liqin LU Zhenming LI Pengfei 《Journal of Ocean University of China》 SCIE CAS CSCD 2021年第6期1545-1556,共12页
Complete mitochondrial genomes(mitogenomes)can provide useful information for phylogenetic relationships,gene rearrangement,and molecular evolution.Here,the complete mitogenome of Episesarma lafondii(Brachyura:Grapsoi... Complete mitochondrial genomes(mitogenomes)can provide useful information for phylogenetic relationships,gene rearrangement,and molecular evolution.Here,the complete mitogenome of Episesarma lafondii(Brachyura:Grapsoidea:Sesarmidae)was sequenced through next-generation sequencing technique for the first time.The 15640 bp mitogenome contains the entire set of 37 genes and an AT-rich region.The rearrangements of two tRNA genes(tRNA-His and tRNA-Gln)are compared with that in the pancrustacean ground pattern,and the tandem duplication/random loss model was selected to explain the observed gene rearrangements.The phylogenetic results showed that all sesarmid crabs belong to the same group,wherein the genus Episesarma showed the closest relationship with Clistocoeloma.Furthermore,the monophyly of each family was well supported except for Xanthidae,Gecarcinidae,and Homolidae.The correlation between the phylogeny of Sesarmidae species and the gaps in the QIM region was analyzed.Evidently,the gaps between Q and I(Gap3 and between I and M(Gap4)degenerated with the evolution process.In general,the results will contribute to the in-depth understanding of gene rearrangements in Sesarmidae mitogenomes and provide new insights into the phylogeny of Brachyura. 展开更多
关键词 mitochondrial DNA sesarmid crab gene order rearrangement mechanism phylogenetic construction
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High Microplastic Contamination in Juvenile Tri-Spine Horseshoe Crabs:A Baseline Study of Nursery Habitats in Northern Beibu Gulf,China
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作者 WANG Xueping LO Hoi Shing +6 位作者 FU Yijian WU Zhou QIN Danmei HUANG Xing ZHU Jingmin CHEUNG Siu Gin KWAN Kit Yue 《Journal of Ocean University of China》 SCIE CAS CSCD 2022年第3期521-530,共10页
Microplastics(MPs)are ubiquitous in marine sedimentary environments.Their occurrence in horseshoe crabs and interactions with the sedimentary environment has not been determined.In this study,MPs,mostly microfibers,we... Microplastics(MPs)are ubiquitous in marine sedimentary environments.Their occurrence in horseshoe crabs and interactions with the sedimentary environment has not been determined.In this study,MPs,mostly microfibers,were found in all extracted gastrointestinal tract(GIT)samples of the juvenile Tachypleus tridentatus from the northern Beibu Gulf,China.The MP concentrations(4–53 items ind-1)were higher than those in most marine benthic invertebrates(<15 items ind-1)reported in Chinese waters,despite their generally low level in habitat sediments(9–1818 items kg-1).The correlation between the juveniles and sediments was not evident,but the abundance in juvenile horseshoe crab GITs decreased with ages.The findings were relevant to the life-history characteristics of the species,typically with limited dispersal capability and their spending nine years or longer time living in mangrove wetlands during low tides,with apparent ontogenetic changes in their diets.These baseline data enable a better understanding of MP availability in benthic macroinvertebrates,and the ecological risks present in the ecosystems. 展开更多
关键词 horseshoe crab INVERTEBRATE fiber INTERTIDAL CELLOPHANE
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Genetic Differences of Mitten Crabs Based on RFLP Analysis on Mitochondrial Cytochrome Oxidase Subunit I(COI) Gene
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作者 HU Pengfei WANG Qian +1 位作者 DAI Wei WANG Xiaomei 《Journal of Northeast Agricultural University(English Edition)》 CAS 2008年第1期51-57,共7页
The genetic differences of 15 mitten crab populations from 6 river systems in China's Mainland and 1 population from Russia were studied based on RFLP analysis of mitochondrial cytochrome oxidase subunit I (CO I... The genetic differences of 15 mitten crab populations from 6 river systems in China's Mainland and 1 population from Russia were studied based on RFLP analysis of mitochondrial cytochrome oxidase subunit I (CO I). The results showed that Tas I-RFLP pattern could be used as a genetic marker to distinguish Eriocheir hepuensis from Eriocheir sinensis, Eriocheirjaponica and Eriocheir leptognathus; genetic distances among 13 populations of Eriocheir sinensis range from 0 to 0.015, indicating that they were different geographic strains; the subspecies status of Eriocheir sinensis and Eriocheir hepuensis (population from Nanliujiang) were considered owning to their genetic distances of 0.02-0.044, indicating that genetic divergence between them was low; Eriocheir leptognathus (population from Nanpaihe, Tianjin) was the most distant taxon with genetic distances value of 0.147-0.195, which could be defined as genetic distances between species in genus Eriocheir. 展开更多
关键词 mitten crab genetic differences mitochondrial CO I gene RFLP
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Mitochondrial Haplotypes suggest Genetic Component for Habitat Preference in Blue Crabs
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作者 Megan NMoran Thomas FSchulz Daniel Rittschof 《Journal of Fisheries Science》 2020年第2期32-40,共9页
Atlantic blue crabs(Callinectes sapidus)are ecologically and commercially fundamental.Life stages are punctuated with migration.Adults and juveniles live in estuaries and sounds.Larval stages develop in the coastal oc... Atlantic blue crabs(Callinectes sapidus)are ecologically and commercially fundamental.Life stages are punctuated with migration.Adults and juveniles live in estuaries and sounds.Larval stages develop in the coastal ocean.Juvenile and adult crabs occupy habitats from high salinities to fresh water.We determined whether maturing juvenile and adult blue crab habitat use is reflected in mitochondrial cytochrome oxidase 1 haplotypes.High salinity crabs had lower haplotype diversity(0.7260±.03900)compared to spawning crabs(0.9841±.00021)and low salinity crabs(0.94154±.00118).Significant pairwise differences in haplotypes were found between high salinity and spawning crabs(Nm=0.26018,p<0.001),and between high salinity and low salinity crabs(Nm=0.19482,p<0.001)indicating a lack of gene flow.Crabs from high salinity had highly significant genetic differentiation compared to spawning crabs(Fst=0.11830,p<0.001)and low salinity crabs(Fst=0.09689,p<0.001).Results support the hypothesis that genetics influence habitat selection.Crab larvae mix in the coastal ocean but occupy specific habitats upon return to sounds and estuaries.These findings have implications for the management of fisheries. 展开更多
关键词 Habitat preference COI Haplotypes Genetic differentiation Callinectes sapidus Blue crab MIGRATION Habitat selection Implications for management
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Size specific boldness associated with differences in resource requirements and habitat use: a cross-sectional study in hermit crabs
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作者 Mark Briffa Rose Archer 《Current Zoology》 SCIE CAS CSCD 2023年第3期360-366,共7页
Animal personality is often studied within compressed periods of observation that represent narrow windows in comparison to animal lifespans.Although much is known about the relations between repeatable personality tr... Animal personality is often studied within compressed periods of observation that represent narrow windows in comparison to animal lifespans.Although much is known about the relations between repeatable personality traits and cross-situational behavioral plasticity,less is known about how such traits might differ across age classes or life history transitions.We conducted a cross-sectional study of startle response duration in 3 size classes of Pagurus bernhardus,the common European hermit crab.We defined size classes using transitions in the preferred species of gastropod shells that accompany growth,and this change in preference is in turn associated with a transition from intertidal to subtidal habitats.Compared with small-and medium-sized intertidal individuals the larger subtidal hermit crabs behaved cautiously by showing startle responses of greater duration following disturbance.Startle responses were also repeatable within all 3 size classes,confirming the presence of animal personality in intertidal hermit crabs and demonstrating that this pattern is retained within the largest size classes,which have undergone the transition from intertidal to subtidal habitat.Interestingly,there was a trend for the pattern of repeatable startle response durations to increase with size class,with the highest value for repeatability and the greatest range of startle response durations being present within the large subtidal population.The greater range of startle responses indicates that the longer startle response durations in some larger individuals are more likely due to developmental changes with age and habitat use than reflecting selection against the boldest individuals during earlier stages of life. 展开更多
关键词 BOLDNESS development HABITAT hermit crab PERSONALITY RESOURCES
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Crab脉冲星巨脉冲辐射等待时间分布的非稳态泊松模拟
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作者 王辉 温志刚 +10 位作者 王娜 王洪光 陈建玲 袁建平 袁少南 李健 吕成冰 王金鹏 闫文明 托乎提努尔 崔思然 《天文学报》 CAS CSCD 北大核心 2024年第2期103-110,共8页
利用中国科学院新疆天文台南山观测站26m射电望远镜,在中心频率1556MHz,对Crab脉冲星(PSR B0531+21)进行了长达12.6h的连续观测,观测带宽为512MHz,时间分辨率为32μs,研究了巨脉冲辐射的等待时间分布特征.观测共探测到2097个信噪比大于1... 利用中国科学院新疆天文台南山观测站26m射电望远镜,在中心频率1556MHz,对Crab脉冲星(PSR B0531+21)进行了长达12.6h的连续观测,观测带宽为512MHz,时间分辨率为32μs,研究了巨脉冲辐射的等待时间分布特征.观测共探测到2097个信噪比大于10的巨脉冲,对应的流量密度大于100Jy.巨脉冲的爆发率表现为高度的间歇性,在较短的时间内具有较高的爆发率,在相对长的宁静期内巨脉冲的爆发率较低,尤其是中间脉冲相位内的巨脉冲爆发.相邻两个巨脉冲的等待时间分布表现为幂律分布特征,可以用一个非稳态的泊松过程进行模拟,这表明巨脉冲的爆发是一种独立的随机事件.此外,主脉冲和中间脉冲相位上的巨脉冲具有不同的等待时间分布特征,这意味着脉冲星不同磁极的巨脉冲辐射机制可能是不同的.这些观测结果对于理解脉冲星的射电辐射机制具有重要意义. 展开更多
关键词 脉冲星:个别:Crab 脉冲星:巨脉冲 方法:观测 方法:数据分析
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多发性骨髓瘤CRAB症状与抗氧化酶活性的相关性分析
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作者 张小旭 张有智 +1 位作者 马育硕 王伟 《中国实验血液学杂志》 CAS CSCD 北大核心 2024年第2期493-498,共6页
目的:探讨多发性骨髓瘤(MM)患者CRAB症状的常见临床指标与抗氧化酶活性之间的联系。方法:比色法检测44名骨髓瘤患者及12名非恶性血液病患者骨髓上清中的过氧化氢酶(CAT)、谷胱甘肽过氧化物酶(GPX)和超氧化物歧化酶(SOD)的活性,分析两组... 目的:探讨多发性骨髓瘤(MM)患者CRAB症状的常见临床指标与抗氧化酶活性之间的联系。方法:比色法检测44名骨髓瘤患者及12名非恶性血液病患者骨髓上清中的过氧化氢酶(CAT)、谷胱甘肽过氧化物酶(GPX)和超氧化物歧化酶(SOD)的活性,分析两组抗氧化酶的活性差异以及骨髓瘤组中抗氧化酶的活性与血钙、血肌酐(Scr)、血红蛋白(Hb)、碱性磷酸酶(ALP)及骨破坏区域数量的关系。结果:与对照组相比,骨髓瘤患者的抗氧化酶活性更低(P<0.05)。当血钙、ALP的浓度高于正常水平,Hb低于85 g/L及存在多个骨破坏区域时,抗氧化酶CAT、SOD和GPX的活性明显降低(P<0.05);当Scr高于正常水平时,GPX活性明显降低(P<0.05)。回归分析结果显示,CAT、SOD、GPX与血钙(r=-0.538,r=-0.456,r=-0.431)、Scr(r=-0.342,r=-0.384,r=-0.463)和ALP(r=-0.551,r=-0.572,r=-0.482)均呈负性相关。结论:抗氧化酶CAT、SOD和GPX的活性在多发性骨髓瘤患者中下降,并且与CRAB症状的常见临床指标(血钙、Scr、ALP)呈负性相关,或许可以通过提高骨髓瘤患者体内的抗氧化酶活性来治疗CRAB症状。 展开更多
关键词 多发性骨髓瘤 CRAB症状 过氧化氢酶 超氧化物歧化酶 谷胱甘肽过氧化物酶
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