Contribution of artificial reefs to the diet of the white sea bream (Diplodus sargus)   总被引：1，自引：0，他引：1  

Leitao  Francisco; Santos  Miguel N.; Monteiro  Carlos C. 《ICES Journal of Marine Science》2007,64(3):473-478

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Seasonal succession of cyanoprokaryotes in a hypereutrophic oligo-mesohaline lagoon from the South of France   总被引：2，自引：0，他引：2  

Nicolas Chomrat  Robert Garnier  Cline Bertrand  Arlette Cazaubon 《Estuarine, Coastal and Shelf Science》2007,72(4):591-602

The Bolmon lagoon (South of France) is an oligo-mesohaline coastal lagoon that has undergone intense eutrophication in the past decades, resulting from a strong concentration of human activities in its drainage basin. Consequently, it exhibits some characteristics typical of an advanced trophic state; namely, the disappearance of submerged vegetation, the permanently intense phytoplankton growth and the recurrence of cyanoprokaryote blooms. As cyanoprokaryote dominance in south-temperate saline lagoons is little reported, we carried out this study in order to understand the seasonal variations in the phytoplankton composition and biomass, and to analyse the influence of environmental parameters such as salinity, nutrients and climate on the seasonal succession of species. In this lagoon, the phytoplankton was permanently dominated by cyanoprokaryotes, probably because of high availability of nutrients, low light penetration in the water column and frequent turbulent mixing induced by wind. The two most abundant species Planktothrix agardhii (in winter–spring) and Pseudanabaena limnetica (in summer) have low light requirements and are well adapted to a high mixing frequency, which defines the S1 functional group in Reynolds' typology for phytoplankton. Although widely studied in north-temperate lakes, blooms of these typically freshwater species are almost unreported in the Mediterranean area, especially in brackish ecosystems that are not their normal habitat. In the Bolmon lagoon, all their requirements for nutrients, light and mixing are satisfied and they seem to cope with a moderate presence of salt but P. agardhii was less competitive than P. limnetica at highest salinities, the latter being probably more halophytic. Contrary to the observations in lakes located at higher latitudes, the Mediterranean climate seems to induce a typical seasonal pattern of succession characterised by the dominance of P. agardhii (winter) – Chroococcales (spring) – Pseudanabaenaceae (summer) – P. agardhii (autumn, winter). The warm temperatures seemed to have a major influence on the phytoplankton succession, being responsible for the survival of Planktothrix during winter and its rapid and intense development in early spring. Intense mixing and high irradiance in summer promoted the development of Pseudanabaenaceae, as reported in another south-temperate lagoon, the Albufera of Valencia (Spain). The ecological success of Oscillatoriales observed in the Bolmon lagoon is a perfect example of a shift to the “turbid stable state” as proposed for freshwater shallow lakes only. Our work demonstrated that hypereutrophic Mediterranean lagoons can function very similarly to shallow lakes at higher latitudes; but the warmer climate and higher irradiances are probably responsible for differences in the seasonal pattern of species dominance.  相似文献   

比色法测定海藻植物促生长剂中甜菜碱的含量     

孙杰  韩丽君  张立新  杨化浩 《海洋科学》2007,31(11):5-8

为了对商品化的海藻植物促生长剂中甜菜碱的含量进行测定,利用酸性条件下甜菜碱能与雷氏盐发生特异性反应,生成的络合物在λ525nm有最大吸收的特征,用比色法来检测甜菜碱的含量,并对测定条件、络合物的稳定性、方法的回收率进行了系统研究。结果表明,标准曲线的相关系数为0.9985,平均加标回收率是99.07%。用此方法测定了国内外7种海藻植物促生长剂产品中甜菜碱的含量,其中1号样品甜菜碱质量比最低,为0.6193mg/g,6号样品甜菜碱质量比最高,为120.4163mg/g。此方法能快速、简便、准确地测定海藻植物促生长剂中甜菜碱的含量。  相似文献   

九龙江口红树林上附着动物的生态   总被引：12，自引：2，他引：12  

周时强  洪荣发 《台湾海峡》1993,12(4):335-341

福建九龙江口红树林附着动物７种，白脊藤壶Ｂａｌａｎｕｓ ａｌｂｉｃｏｓｔａｔｕｓ和白条地藤壶Ｅｕｒａｐｈｉａ ｗｉｔｈｅｒｓｉ在数量上占绝对优势，是危害红树的主要附着动物。附着动物在河口红树林区的数量分布随着盐度的降低而减少，其栖息密度和生物量的高峰期在夏，秋两季。生长茂密的红树林（郁蔽度大于０．５），附着动物主要分布于水流畅通的向海边缘和潮沟边缘的红树上。水流畅通程度是影响附着动物在红树林区向纵  相似文献   

Spatial Variation in the Structure of Kelp Forest Communities Along a Wave Exposure Gradient     

Christopher  Harrold  James  Watanabe Susan  Lisin 《Marine Ecology》1988,9(2):131-156

Abstract. Four sites were sampled in kelp (Macrocysiis pyrifera) forests occupying rocky bottom habitats along a wave exposure gradient in central California. Consistent betwecn-site differences were found in the three major structural elements - the surface canopy, the undcrstory assemblage, and the ground cover/turf assemblage - of kelp forest communities. Macrocysiis pyrifera was found at all four sites. Nereucyslis tuelkeana only at the most exposed site. The understory kelps Laminaria setchellii and Pterygopltora californica were also characteristic of exposed sites. Articulated coralline algae were more abundant at exposed sites than protected, while fleshy red algae showed the opposite pattern. All four study sites were located along 8.5 km of coastline, and thus were assumed to have available to them the same species pool for colonization. The substrate composition was the same and the amount of unconsolidated substrate was similar at all four sites. We suggest that exposure to wave-generated water motion, through its influence on the surface canopy and therefore on the amount of light reaching the bottom, is responsible for these between-site differences.  相似文献   

The Effect of Human Exclusion on the Population Structure of Key-Hole Limpets Fissurella crassa and F. limbata on the Coast of Central Chile     

Doris  Oliva Juan Carlos  Castilla 《Marine Ecology》1986,7(3):201-217

Abstract. We describe the basic ecology of two key-hole limpets, Fissurella crassa and Fissurella limbata , which are heavily harvested by coastal shellfishermen (mariscadores) at the rocky intertidal of central Chile. The ecological role of human predation on these species was assessed. Anthropic exclusion from a stretch of the rocky intertidal at Las Cruces (non-harvested area) for about two and a half years resulted in changes of the densities and size distributions of these fissurelid species as compared to populations in control zones (harvested area). Differential human predation generates, on key-hole limpets, responses of different intensities related to the accessibility of man to the mesohabitats (sheltered platforms, exposed platforms and vertical walls) and fringes of the intertidal (mid-low intertidal and Lessonia nigrescens fringe). Thus, size distributions and mean densities of both fissurelids differ widely between the harvested and non-harvested areas on both platform habitats but not on vertical walls. In the mid-low intertidal fringe, differences are greater than in the less accessible L. nigrescens intertidal fringe. Moreover, we discuss the way in which other species, directly harvested by mariscadores (i. e., the mollusc Concholepas concholepas) can affect the keyhole limpet populations of central Chile rocky shores. Finally, we highlight the ecological role of these limpets on the dynamics of intertidal ecosystems and how they can modify community landscape.  相似文献   

Centurial and decadal oceanographic influences on changes in northern gannet populations and diets in the north-west Atlantic: implications for climate change   总被引：1，自引：1，他引：1  

Montevecchi  W. A.; Myers  R. A. 《ICES Journal of Marine Science》1997,54(4):608-614

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厦门地区软相潮间带多毛类的生态   总被引：1，自引：0，他引：1  

鲁琳 《台湾海峡》1996,15(3):286-292

根据厦门地区１９９０年２月至１９９２年１月调查软相潮间带所获资料，研究了该区多毛类的种类组成，数量与分布，结果表明，该区多毛类种类丰富，共鉴定出１１８种，隶属于３７科８３属。其中，高潮区４０种，中潮区９０种，低潮区８３种。多毛类平均栖息密度８７个／ｍ＾３，平均生物量３．３３ｇ／ｍ＾２。  相似文献   

福建红树林上钻孔动物的生态   总被引：1，自引：0，他引：1  

黄戚民  周时强 《台湾海峡》1996,15(3):305-309

福建红树林上的钻孔动物共发现了５种，其中软体动物的龙骨节铠船蛆Ｂａｎｋｉａ ｃａｒｉｎａｔａ、裂铠船蛆Ｔｅｒｅｄｏ ｍａｎｎｉ和甲壳动物的光背团水虱Ｓｐｈａｅｒｏｍａ ｒｅｔｒｏｌａｅｖｉｓ是破坏红树林的主要的钻孔动物。钻孔动物钻凿红树茎的基部和裸露的根部，垂直分布受潮汐水位制约，在红树林区的纵深分布与水流畅通程度有关。  相似文献   

秦山核电站邻近水域生态特点     

何德华 《海洋学研究》1991,9(2):119-123

本文综述了1989年4月至1990年1月秦山核电站邻近水域生态调查结果,认为,该水域具暖温带强潮河口区生态特征。水体虽含丰富营养盐和充足溶解氧,由于同时存在着各种不利于生物繁殖生长的环境因子,表现为生物资源贫瘠、种类组成简单,测区所代表的强潮河口湾顶区属低生产力水域。  相似文献