کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4541407 | 1326723 | 2009 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Calcidiscus quadriperforatus and Calcidiscus leptoporus as oceanographic tracers in Lisbon Bay (Portugal)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
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چکیده انگلیسی
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. AÂ 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Estuarine, Coastal and Shelf Science - Volume 81, Issue 3, 10 February 2009, Pages 333-344
Journal: Estuarine, Coastal and Shelf Science - Volume 81, Issue 3, 10 February 2009, Pages 333-344
نویسندگان
A. Silva, S. Palma, P.B. Oliveira, M.T. Moita,