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首页> 外文期刊>Estuarine Coastal and Shelf Science >Calcidiscus Quadriperforatus And Calddiscus Leptoporus As Oceanographic Tracers In Lisbon Bay (portugal)
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Calcidiscus Quadriperforatus And Calddiscus Leptoporus As Oceanographic Tracers In Lisbon Bay (portugal)

机译：Calcidiscus Quadriperforatus和Calddiscus Leptoporus作为里斯本湾的海洋示踪剂（葡萄牙）

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A study of the Calcidiscus genus in Lisbon Bay has revealed the presence of Calcidiscus quadriperforatus and Calcidiscus leptoporus. Samples were collected continuously on a weekly basis for four years (July 2001-May 2005) and on a cruise carried out in summer 2005, covering Lisbon Bay. Calcidiscus quadriperforatus and C. leptoporus developed in the same range of temperature and salinity, 11.5-21.5 ℃ and 26.9-36.3, respectively. The two species seemed to respond independently but had a co-occurring seasonal pattern nearshore, developing in different concentrations throughout the seasons. The maxima of both species occurred in low turbulent and nutrient enriched waters, which was also favourable for the development of larger coccospheres of C. quadriperforatus. The concentrations of both species decreased from 2001 until 2005, due to the intensification and persistence of upwelling and rainy periods. From late autumn until winter, mixed populations were observed nearshore, largely dominated by Calcidiscus quadriperforatus, in colder and nutrient enriched waters, while during spring, when temperatures begin to increase, only Calcidiscus leptoporus was observed, in mature upwelled waters. Calcidiscus quadriperforatus was considered more opportunistic than C. leptoporus. The availability of nutrients seemed to have influenced the size increase of C. quadriperforatus coccospheres. Both species developed offshore during summer, when the shelf is occupied by colder turbulent upwelled waters. A short downwelling episode in summer 2005, associated with two counter-rotating mesoscale eddies, responsible for a strong north-eastward flow of warm oceanic waters into the bay, allowed the development of C. quadriperforatus nearshore. Contemporary satellite images revealed the presence and onshore displacement of these waters and C. quadriperforatus and C. leptoporus distribution highlighted these conditions. The development of each species nearshore also gave indications of local oceanographic changes during winter and spring.
机译：对里斯本湾Calcidiscus属的一项研究表明，Calcidiscus quadriperforatus和Calcidiscus leptoporus的存在。连续四年（2001年7月至2005年5月）每周一次收集样品，并于2005年夏季进行一次覆盖里斯本湾的巡游。在相同的温度和盐度范围（分别为11.5-21.5℃和26.9-36.3）下，四加钙小球藻和钩端螺旋体发育。这两个物种似乎独立响应，但在近岸具有共同出现的季节性模式，在整个季节中以不同的浓度发展。两种物种的最大值都发生在湍流和营养丰富的低水域，这也有利于更大的C. quadriperforatus球囊的发展。由于上升和下雨期的加剧和持续，两种物种的浓度从2001年到2005年都下降了。从深秋到冬季，在较冷且营养丰富的水域中，近岸观察到混合种群，主要由四吻线虫占主导，而在春季，当温度开始升高时，在成熟的上涌水域中，仅观察到了斜纹夜蛾。拟南芥（Calcidiscus quadriperforatus）比钩端螺旋体（C. leptoporus）更具机会性。营养物的可用性似乎已经影响了四裂C球菌球菌的大小增加。在夏季，当架子被较冷的湍流上升水占据时，这两个物种都在近海发展。 2005年夏季发生的短暂下沉事件，与两个反向旋转的中尺度涡旋有关，造成了温暖的海水向东北强烈向东北流入海湾，从而使近岸C. quadriperforatus得以发展。当代卫星图像揭示了这些水域的存在和在岸上的位移，四角C和角le的分布突出了这些情况。近岸每个物种的发育也表明了冬季和春季当地海洋学的变化。

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