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Habitat use of the tapertail anchovy(Coilia mystus Linnaeus, 1758) from the Oujiang River Estuary and the Zhujiang(Pearl) River Estuary was studied by examining the environmental signatures of Sr and Ca in otoliths using electron probe microanalysis. Individuals from the Oujiang River had higher and varied Sr:Ca ratios(expressed as(Sr:Ca)×1 000, 3.83–13.0 average) in the otolith core regions, suggesting that they were born in brackish or sea waters, and that a freshwater habitat might not be necessary for egg hatching and larval growth.While, individuals from the Zhujiang River had lower Sr:Ca ratios(0.39–2.51 average) in the core regions,suggesting a freshwater origin. After hatching, anchovies from the Zhujiang River migrate downstream to the river estuary close to brackish water. Our results demonstrated varied habitat use for spawning during stages of early life history between the two populations, and suggested that such variations are promoting diversity of life history strategies of this species. 相似文献
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李刚 《海洋学报(英文版)》2019,38(8):78-85
Mixing of freshwater and seawater creates the well-known salinity gradients along the estuaries. In order to investigate how phytoplankton respond to the acute salinity changes, we exposed natural phytoplankton assemblies from the Jiulong River Estuary to differential saline field water while continuously monitoring their photosynthetic performances under both indoor-and outdoor-growth conditions. When the natural cell assemblies from salinity 30 field water were exposed to series low saline field water(salinity 25, 17, 13 and 7.5), the effective Photosystem II quantum yield(ΔF/F_m′) decreased sharply, e.g., to one-fifth of its initials after 5 min exposure to salinity 7.5 field water, and then increased fast during the following 40 min and almost completely recovered after 320 min. During such an exposure process, non-photochemical quenching(NPQ) sharply increased from 0 to 0.85 within 5 min, and then decreased to nearly 0 within the following 70 min. When these cells re-acclimated to salinity 7.5 field water were exposed to series high saline field water(salinity 13, 17, 25 and 30), a similar response pattern was observed, with the decreased ΔF/F_m′ accompanied with increased NPQ, and followed by the recovery-induced increase in ΔF/F_m′ and decrease in NPQ. A similar response pattern as ΔF/F_m′to the acute osmotic stress was also observed in the photosynthetic carbon fixation capacity according to radiocarbon(~(14)C) incorporation. Our results indicate that estuarine phytoplankton assemblies could rapidly recover from the acute osmotic stress, implying a potential cause for their frequent blooms in coastal-estuarine waters where despite drastically varying salinity, available nutrients are abundant due to the land-derived runoffs or mixing-caused relaxations from sediments. 相似文献
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闽江口及周边海域沉积物输运及资源效应 总被引:1,自引:0,他引:1
河流入海泥沙的大部分主要分布在河口、三角洲及近岸陆架地区,发育一系列的粗颗粒沉积体系,是海砂资源重要分布区。本文以福建闽江口为研究对象,初步探讨了沉积物输运过程及海砂资源的形成机制。观测结果表明,闽江河口水体盐度由河口内部向口外海域逐渐增大,水体浊度总体减小;闽江河口附近海域近底部(距离海底25cm)流向表现出一定的旋转流特征,潮周期内余流表现为向海输运,而推移质输运主要发生在涨潮期间,并且潮周期内净向陆输运。表层沉积物粒度分析结果表明,闽江河口水下三角洲前缘表层沉积物主要由粗颗粒物质组成,沉积物类型以砂和砂质粉砂为主,中值粒径小于4Φ;前三角洲地区表层沉积物主要由细颗粒物质组成,中值粒径介于4Φ—6Φ之间。沉积物粒径趋势分析结果表明,闽江入海泥沙经梅花水道和长门水道入海后,在盐淡水混合、径流、潮流的作用下,在闽江河口形成了四个粗颗粒沉积物汇聚区,成为闽江口地区海砂资源的重要分布区;而细颗粒物质在河口羽流和潮流的作用下向偏东方向输运,形成了以黏土质粉砂为主的前三角洲。 相似文献
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<正>百岛洞头,犹如一串镶嵌在东海万倾碧波之上的珍珠,山清水秀,山海兼胜,资源丰富,人杰地灵,以"石奇、滩佳、礁美、洞幽、鱼丰、鸟多"著称,富有"海外桃源别有天"的意境。地处浙南沿海,温州市瓯江口外,"外载海洋,内资三江",区位优越,由103个岛、259个礁组成。冬暖夏凉,年平均气温17.3摄氏度,山海兼胜,云海变幻,风光旖旎,引人入胜,是浙江省唯一以县冠名的风景名胜区。共有9大景区、400多个景点,加之人文景观与海岛风味,是一个集绝壁奇滩、海 相似文献
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The performance and integrity of a cassette cross-flow ultrafilter(Pellicon 2, Millipore) are examined with a suite of macromolecules of different molecular masses. The retention coefficient during the cross-flow ultrafiltration experiments increases with increasing molecular mass and reaches 90% with 10 kDa dextran in both milli-Q water and ultrafiltered seawater media. Based on a 90% retention coefficient, the molecular mass cut-off for the ultrafiltration membrane is defined at 10 kDa, which is ten times(1 kDa) that rated by the manufacturer. To further validate the accuracy of the laboratory calibration, the samples from the lower Zhujiang River and the Jiulong River Estuary are ultrafiltered with the cassette ultrafiltration membrane and the colloidal organic carbon abundances in these samples are quantified with the ultrafiltration permeation model based on time series permeation subsamples. The colloidal organic carbon abundances are 5.8%–21.1% in the Jiulong River Estuary and 5.6%–11.0% in the lower Zhujiang River. These are consistent with the reported values for both estuaries as well as with the colloidal organic carbon abundances in marine environments over the coastal and open oceans with 10 kDa cut-off membranes. Therefore, these field data support the laboratory calibration result and indicate the validity of the experimental and quantification procedure adopted. The discrepancy between the nominal molecular mass cut-off and the actual pore size of the ultrafiltration membrane should be of great concern for research in colloidal and nanoparticle biogeochemistry. Careful examination of the membrane integrity should be taken during ultrafiltration experiments in order to avoid misleading molecular mass cut-off information. 相似文献
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旅游扶贫应立足于贫困人口的获利和发展,其核心是使贫困人口从旅游开发中获得更多的发展机会和净利益。以居民感知理论为基础,对汝城国家森林公园九龙江地区居民进行问卷调查,采用因子分析法和数理统计法,分析当地居民对旅游扶贫效应的感知和态度。研究结果表明:当地居民对旅游扶贫的社会和经济效应感知明显,对环境效应不敏感,参与旅游业的意愿强,但受经济、文化等因素制约,实际参与能力不足。建议当地政府将旅游业培育成特色产业,以居民受益为出发点,对居民进行扶持与引导,鼓励居民参与旅游开发与决策,并注重资源开发与保护相结合,以期实现贫困人口脱贫和旅游发展的双赢。 相似文献
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