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Yuting Zhang Shanshan Song Bin Zhang Yang Zhang Miao Tian Ziyi Wu Huorong Chen Guangmao Ding Renyan Liu Jingli Mu 《海洋学报(英文版)》2023,42(2):134-141
Toxic harmful algal blooms(HABs) can cause deleterious effects in marine organisms, threatening the stability of marine ecosystems. It is well known that different strains, natural populations and growth conditions of the same toxic algal species may lead to different amount of phycotoxin production and the ensuing toxicity. To fully assess the ecological risk of toxic HABs, it is of great importance to investigate the toxic effects of phycotoxins in marine organisms. In this study, the short-te... 相似文献
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Cen Jingyi Wang Jianyan Huang Lifen Lin Yarou Ding Guangmao Qi Yuzao Lü Songhui 《中国海洋湖沼学报》2021,39(1):242-258
Journal of Oceanology and Limnology - On May 24–29, 2019, a harmful algal bloom occurred in Pingtan coastal areas, Fujian, southeast China, and caused mass mortality of cage-cultured fish.... 相似文献
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Presently, research is lacking regarding the diagnosis and evaluation of habitat degradation in enclosed bay systems. We established a diagnostic model for enclosed bay habitat degradation （EBHD model） using a multi-approach integrated diagnostic method in consideration of driving force-pressure- state-influence-response. The model optimizes the indicator standardization with annual average change rate of habitat degradation as the basic element, to reflect accurately the impact of the change and speed of degradation on the diagnostic results, to quantify reasonably the contribution of individual diagnostic indicator to habitat degradation, and to solve the issue regarding the influence of subjective factors on the evaluation results during indicator scoring. We then applied the EBHD model for the Sansha Bay in Fujian Province, China, evaluated comprehensively the situation of habitat degradation in the bay, and screened out the major controlling factors in the study area. Results show that the diagnostic results are consistent in overall with the real situation of the study area. Therefore, the EBHD model is advantageous in terms of objectivity and accuracy, making a breakthrough in diagnosis and evaluation for habitat degradation in enclosed bay systems. 相似文献
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The process of habitat degradation varies in habitat type and driving force which shows certain spatial and temporal heterogeneity on regional scales. In the present study, a new diagnostic model for enclosed bay habitat degradation was established, with which the spatial and temporal variation patterns of habitat degradation during 1991–2012 in Sansha Bay, Fujian, China was investigated. The results show that anthropogenic disturbance is the major controlling factor for the habitat degradation in large temporal heterogeneity in the bay. On the other hand, the habitat degradation experienced signifi cant spatial variations among six sub-bays. Under the joint action of temporal and spatial heterogeneity, the degradation trend in growing scale shows a more signifi cant correlation with the distribution of local leading industries along shorelines. Therefore, we quantifi ed the main characters of habitat degradation in Sansha Bay, and have understood the relationship between the status of habitats spatio-temporal variation value and the main controlling factor leading to the changes. However, a defi ciency of this research is the lack of or inaccessible to the detailed data, which shall be better solved in the future study for accessing more data from more sources. 相似文献
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本文运用有限元法计算分析研究了多节扩孔钻孔灌注桩（DX桩）不同支盘数和支盘间距时土中应力场及其工作性状的变化规律，并从应力角度探讨了该桩对沉降的控制作用。 相似文献
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为了理清米氏凯伦藻赤潮形成与环境因素的关系,掌握其发生、发展规律,本文分析了2012年春末夏初三沙湾海域米氏凯伦藻赤潮期间的气象、水文和营养盐情况,并结合室内模拟培养实验,探讨了米氏凯伦藻赤潮形成与各环境因素的相关性。结果显示米氏凯伦藻赤潮通常发生在温度为20.5~25.0℃和盐度为24.3~32.3的海域,其细胞生长的最适温度和最适盐度分别为:22.0~25.0℃和26.0~30.0;Pearson相关性分析显示,米氏凯伦藻细胞密度与叶绿素a、无机磷、化学需氧量呈极显著正相关,与透明度、氨氮呈显著负相关;另外,米氏凯伦藻对磷酸盐的需求较低,其赤潮的形成可能主要受水体中氨氮的影响。基于现场调查和模拟实验结果,综合分析认为稳定的水文和气象条件、发生前期降雨输入的无机氮,以及由于持续阴雨导致的较低光照条件是此次米氏凯伦藻赤潮形成和维持的重要条件。 相似文献
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Cen Jingyi Wang Jianyan Huang Lifen Ding Guangmao Qi Yuzao Cao Rongbo Cui Lei L&#; Songhui 《中国海洋湖沼学报》2020,38(3):722-732
Journal of Oceanology and Limnology - On May 24–29, 2019, a bloom occurring in Pingtan coastal areas of Fujian Province caused mass mortality of cage-cultured fish (Plectorhinchus cinctus and... 相似文献
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Science China Earth Sciences - South China preserves a rich archaeological record elucidating the evolution of early modern humans during the Late Pleistocene. However, few studies on plant... 相似文献
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Jingyi CEN Jianyan WANG Lifen HUANG Yarou LIN Guangmao DING Yuzao QI Songhui LÜ 《海洋湖沼学报（英文）》2021,(1):242-258
Abstract On May 24–29,2019,a harmful algal bloom occurred in Pingtan coastal areas,Fujian,southeast China,and caused mass mortality of cage-cultured fi sh.Two clonal cultures of an unknown naked dinofl agellate were set up from seawater samples taken during the bloom.The cultures were examined for morphological features,ultrastructure characters,photosynthetic pigments,the large subunit(LSU)of the rRNA gene,and the internal transcribed spacer(ITS)sequences,as well as acute toxicity analysis.The cell was unarmored,small-sized,and ovoid,and was characterized by elaborate striations on the epicone and hypocone.The nucleus was large,ellipsoid to oval or kidney-shaped,and centrally located in the cell.A long linear apical groove originated above the sulcus in the ventral epicone and extended to the dorsal side.An elongate,slit-like“ventral pore”was located on the left of the epicone,well away from the apical groove.The chloroplasts were yellowish brown,numerous,band like,and irregularly distributed in the cell periphery.Fucoxanthin was the main accessory pigment composition.Phylogeny topology reconstructed on partial LSU rDNA showed that the unknown dinofl agellate branched as a sister species to Karlodinium sp.(strain IFR981&IFR797,from France)and Karlodinium corrugatum(strain KDGSO08,from Australia),with genetic divergences of 0.6%and 3.3%,respectively.Based on the morphological and molecular phylogenetic analysis,we describe the novel dinofl agellate as Karlodinium elegans sp.nov.A toxicity assay revealed that the clonal culture of K.elegans(strain PTB601)had no adverse eff ect on brine shrimp(Artemia salina)and marine medaka(Oryzias melastigma),indicating it may not be a toxic species. 相似文献
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娅怀洞遗址是广西近年又一项重要考古发现,是一处石器时代洞穴遗址,文化遗存分为4期,第一至第三期属于旧石器时代晚期,第四期属于新石器时代晚期.本文以该遗址出土动物遗存为研究对象,鉴定其种属、部位、死亡年龄和性别等信息,观察遗存保存状态和表面痕迹,对其进行尺寸和重量测量.在此基础上,对其进行可鉴定标本数、最小个体数和骨骼发现率的统计,并依据统计结果进行自然环境的复原、人类行为和生业经济的初步分析.遗址出土动物包括软体动物(瓣鳃纲和腹足纲)和脊椎动物(鱼纲、爬行动物纲、鸟纲和哺乳动物纲),计27科19种(属).分析结果显示:自旧石器时代晚期到新石器时代晚期,遗址出土的主要动物,都包括有扁蜷螺科、方形环棱螺、斜口环棱螺、梨形环棱螺、高大环口螺、塔锥短沟蜷、佛耳丽蚌、刻纹丽蚌、三型矛蚌、圆顶珠蚌、河蚬、鲤鱼、青鱼、鳖科、龟科、钝吻鳄科、鸭科、雉科、猕猴、猪獾、野猪、牛亚科、羊亚科和不同体型的鹿科动物等,这表明自旧石器时代晚期到新石器时代晚期,遗址附近的自然条件没有发生大的改变,一直都存在有茂密的森林和相对广阔的水域,各种动植物资源都非常丰富;动物构成始终以哺乳动物纲中的鹿科和猪科数量最多,说明自旧石器时代晚期到新石器时代晚期,先民一直以狩猎鹿科和猪科为代表的野生哺乳动物来获取主要的肉食资源,同时也采集野生植物、捕捞水生的螺类、鱼类和爬行类作为食物资源的补充;从保存数量最多的鹿科和猪科骨骼发现率来看,存在有部分长骨骨骼缺失的现象,说明遗址并非先民宰杀肢解动物的主要场所,遗址中的动物多为先民宰杀肢解后带来的;鹿科动物掌/跖骨及与之相连的腕跗部骨骼发现率普遍较高,且要明显高于同时期的猪科动物,可能与先民有意识选择鹿科动物该部位的骨骼来制作骨器的行为有关;大量出土螺类存在壳顶缺失的现象,这应该与先民对螺肉的取食有关,与娅怀洞遗址的年代相当的柳州白莲洞遗址也存在类似的现象.从旧石器时代晚期到新石器时代晚期的纵向演变来看,先民对哺乳动物的利用程度是在逐渐增加的,对鱼的利用程度是大幅度减少的,对腹足动物的利用也有一定程度的减少,遗址动物群构成的这种变化体现了新石器时代晚期先民生活方式和生业经济选择(定居和农业)的变化. 相似文献
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