55 research outputs found
Temporal changes in total and size-fractioned chlorophyll-a in surface waters of three provinces in the Atlantic Ocean (September to November) between 2003 and 2010
Phytoplankton total chlorophyll concentration (TCHLa) and phytoplankton size structure are two important ecological indicators in biological oceanography. Using high performance liquid chromatography (HPLC) pigment data, collected from surface waters along the Atlantic Meridional Transect (AMT), we examine temporal changes in TCHLa and phytoplankton size class (PSC: micro-, nano- and pico-phytoplankton) between 2003 and 2010 (September to November cruises only), in three ecological provinces of the Atlantic Ocean. The HPLC data indicate no significant change in TCHLa in northern and equatorial provinces, and an increase in the southern province. These changes were not significantly different to changes in TCHLa derived using satellite ocean-colour data over the same study period. Despite no change in AMT TCHLa in northern and equatorial provinces, significant differences in PSC were observed, related to changes in key diagnostic pigments (fucoxanthin, peridinin, 19’-hexanoyloxyfucoxanthin and zeaxanthin), with an increase in small cells (nano- and pico-phytoplankton) and a decrease in larger cells (micro-phytoplankton). When fitting a three-component model of phytoplankton size structure ̶ designed to quantify the relationship between PSC and TCHLa ̶ to each AMT cruise, model parameters varied over the study period. Changes in the relationship between PSC and TCHLa have wide implications in ecology and marine biogeochemistry, and provide key information for the development and use of empirical ocean-colour algorithms. Results illustrate the importance of maintaining a time-series of in-situ observations in remote regions of the ocean, such as that acquired in the AMT programme
Effect of matrix cracking and interface sliding on the thermal expansion of fibre-reinforced composites
Roentgenological studies on the small intestine (XVI) the influence of accompanied administration of lactase on roentgenological features of small intestine after lactose loading
Gastro-Pleural Fistula: Review of the Literature with a Report of a Case Due to Reticulosarcoma of the Stomach
A Simple Homogenization of Degraded Micro-Cracked Plain Woven and Braided Textile Composites
Relationship between transpulmonary artery distance and pulmonary arterial pressure in patients with chronic bronchitis
Behavioural ecology of 'hand-reared' African elephants (Loxodonta africana (Blumenbach)) in Tsavo East National Park, Kenya
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