Minimum landing size for Northeast Atlantic stocks of deep-water red crab, Chaceon affinis (Milne Edwards and Bouvier, 1894)     

Robinson  Martin 《ICES Journal of Marine Science》2008,65(2):148-154

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中国鲎(Tachypleus tridentatus)微卫星标记筛选及种群遗传多样性和遗传结构分析     

翁朝红  谢仰杰  肖志群  王志勇 《海洋与湖沼》2020,51(2):345-353

采用FIASCO方法构建了中国鲎(Tachypleus tridentatus)(CA)_n微卫星富集文库,对214个阳性克隆进行测序,筛选获得60条含有微卫星的序列,其中可设计引物的序列共38条。38对微卫星引物在37个中国鲎个体中PCR检测发现,只有9个位点具有多态性,其等位基因数为5—14个,每个位点平均具有8.1个等位基因。9个位点之间不存在连锁。利用该9个具有多态性微卫星标记分析了中国沿海9个中国鲎地理群体的种群遗传多样性和遗传结构。结果表明:中国沿海的中国鲎种群遗传多态性水平仍较高, 9个地方群体间无遗传差异,它们之间未见显著分化,且有着较高的基因流;推测人为的迁移是造成遗传无分化的主要原因。我们建议中国鲎已绝迹的海域可从其他海域引入中国鲎个体来恢复地方群体资源。  相似文献   

Inter‐population differences in feeding ecology under nitrogen‐limited diets: Field growth and the role of cannibalism in limiting/improving reserve accumulation     

Claudia Bas  Jesús Nuez  Eduardo Spivak  Toms Luppi 《Marine Ecology》2019,40(3)

Growth is determined by an organism's physiology, physical environment, and biological conditions, including food availability and any intra‐ and inter‐specific interactions that can affect feeding activity. To analyse how all these factors interact to produce final growth in the herbivorous/detritivorous crab Neohelice granulata, we performed field and laboratory experiments with juveniles and adults from three populations which differed genetically as well as in their physical environment and the organic matter (OM) content in the soil that serves as food. We evaluated (a) growth in the field: Juveniles of the three populations were cross‐transplanted in exclusion cages; (b) effect of the presence of adults on juvenile feeding: We measured the feeding activity of small juveniles in presence/absence of an adult male as potential predator in the field; and (c) effect of diet on cannibalism: We analysed the cannibalistic behavior of adult males from two of the populations in the laboratory after they had received protein‐rich (24%) and protein‐poor (3%) diets. In experiment (a), final size was similar for the crabs from all three origins but growth differed between sites. Experiment (b) showed that the presence of adults interfered with feeding activity at the two sites with lower weight indicators. In experiment (c), we observed that low protein diet increased the cannibalistic behavior of adult males, and this effect was more intense in crabs from the poorest food site. Our results contribute to understanding the set of factors and interactions involved in the response of individuals to the prevailing conditions in natural environments in order to maintain a growth rate, perhaps at the expense of different reserve accumulation. They also enable discussion of the limitations of approaches used in laboratory experiments.  相似文献   

Retention of crab larvae in a coastal null zone     

Charles E. Tilburg  Ana I. Dittel  Charles E. Epifanio   《Estuarine, Coastal and Shelf Science》2007,72(4):570-578

Alongshelf transport in the southern Middle Atlantic Bight is forced by buoyancy-driven currents originating in three large estuaries along the bight. These currents are strongest in the coastal ocean near the southern terminus of each estuary, while the analogous region on the northern side is characterized by weak subtidal flow. We used a combination of field observations and numerical modeling to test the hypothesis that these regions of weak subtidal flow are coastal null zones that serve as retention areas for larvae. The field study consisted of a four-day, shipboard investigation of the distribution of blue crab larvae (Callinectes sapidus) near the mouth of Delaware Bay (39°N, 75°W) in late summer, 2004. Hydrographic surveys of the study site were conducted with a hull-mounted, surface-measuring system. Results showed a sharp boundary between the null zone and the buoyancy-driven current to the south. Blue crab larvae were collected in surface plankton tows along a 30-km transect that encompassed these two areas. Stations with higher densities of larvae were clustered in the null zone during both ebb and flood tides. A numerical model was used to examine the physical mechanisms responsible for the observed distribution. Model results agreed with the field survey and showed that simulated larvae are aggregated in the null zone. The simulations also demonstrated that larvae spawned within the null zone have a much greater probability of settling in juvenile nursery habitat within the bay. The close agreement between field and model results provides consistent support for the hypothesis that coastal null zones associated with the buoyancy-driven circulation of large estuaries may allow retention of larvae in the vicinity of the natal spawning population.  相似文献   

Comparative mitochondrial genome analysis of Varunidae and its phylogenetic implications     

Ying Zhang  Li Gong  Xinting Lu  Zengliang Miao  Lihua Jiang  Bingjian Liu  Liqin Liu  Pengfei Li  Xu Zhang  Zhenming Lü 《海洋学报(英文版)》2022,41(6):119-131

Complete mitochondrial genomes(mitogenomes) can indicate phylogenetic relationships, as well as useful information for gene rearrangement mechanisms and molecular evolution. Currently, the phylogenetic location of the genus Varuna(Brachyura: Varunidae) has not been well resolved mainly because of limited representatives(only two extant species). Here, we determined a new mitogenome of this genus(Varuna litterata) and added the published mitogenomes to reconstruct the phylogeny of Varunidae. The ...  相似文献   

Enzyme variation in marine and estuarine populations of a mud crab,Macrophthalmus hirtipes (Ocypodidae)     

F.Y.T. Sin  M.B. Jones 《新西兰海洋与淡水研究杂志》2013,47(4):367-372

Protein and enzyme variation in 2 populations of the mud crab Macrophthalmus hirtipes (Jacquinot, 1853) (Ocypodidae) from 1 marine and 1 estuarine habitat were investigated by poly‐acrylamide gel electrophoresis. A survey of 24 loci revealed that 22 were common to both populations; 20 were monomorphic and 2 were highly polymorphic. Two alleles were detected for each of the polymorphic loci, esterase‐2 (EST‐2) and ester‐ase‐3 (EST‐3). The frequencies of the EST‐3 alleles were similar in the 2 populations. However, the frequencies of the 2 EST‐2 alleles in the estuarine population were significantly different from those for the marine population. Expression of 1 locus, esterase‐4 (EST‐4) was confined to the estuarine population. Two alkaline phosphatase loci (AKPH‐1 and AKPH‐2) were detected in the estuarine population, but only AKPH‐1 was found in the marine population. EST‐4 and AKPH‐2 were neither sex nor age specific. These interpopulational genetic differences may reflect differences in environmental conditions measured between the 2 habitats.  相似文献   

An experimental study on the burrowing activity of river crabs on subsurface water movement and piping erosion     

Yuichi Onda  Naoko Itakura 《Geomorphology》1997,20(3-4)

The effects of the burrowing activity of river crabs on subsurface water movement and piping erosion were studied through a flume experiment. Cohesive field soil was used and constant fluvial head was applied. During the experiments with river crabs, burrows were excavated downwards under the groundwater level. At the outlet of each burrow, the crabs excavated pellets of soil and stacked them in piles, in the form of cone mounds. These mounds acted as effective dams for subsurface outflow, but they sometimes collapsed. The roofs of the burrows also caved in occasionally, whereby the crabs would excavate new burrows. The burrowing activity of the crabs led to marked erosion. In contrast, no marked erosion was observed in experiments without crabs, indicating that piping erosion occurs through the assistance of burrowing activity. It was observed that burrowing activity and piping erosion was pronounced when the hydraulic head was not significantly high (0.21–0.25). Analysis of the potential distribution of the soil mass indicated that the head loss close to the burrow was small in the case of experiments with crabs. This suggests that the burrow enhances rapid discharge of subsurface water. Consequently, burrowing activity was found to play an important role in piping erosion and rapid discharge of subsurface water.  相似文献   

Evaluating the parameters of a MSY control rule for the Bristol Bay, Alaska, stock of red king crabs     

Siddeek  M. S. M.; Zheng  J. 《ICES Journal of Marine Science》2007,64(5):995-1005

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中华绒螯蟹和同科几种大眼幼体的形态区别     

朱小明 《台湾海峡》1997,16(4):465-467

本文镜检了１９９４，１９９５年５，６月采自福建莆田黄石，闽江口的海洋蟹类大眼幼体，初步提出绒螯蟹属与同科几属大眼幼体的区别及绒螯蟹属大眼幼体鉴别方法，并区别出中华绒螯蟹，日本绒螯蟹，字纹弓蟹，相手蟹和厚蟹的大眼幼体。  相似文献   

The life history of the lithodid crab, Paralomis granulosa, in the Falkland Islands     

Hoggarth  Daniel D. 《ICES Journal of Marine Science》1993,50(4):405-424

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