Browsing by Author "Danchenko, Sergei A."
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- Contribution of remote sensing products to the management of offshore aquaculture at Sagres, SW PortugalPublication . Icely, John; Moore, Gerald; Danchenko, Sergei A.; Goela, Priscila; Cristina, Sónia; Zacarias, Marielba; Newton, AliceRemote sensing can address important issues affecting offshore aquaculture such as prediction of Harmful Algal Blooms. In situ data for nutrients, chlorophyll a (Chla) and phytoplankton community from a site for long-line aquaculture for bivalves off the SW coast of Portugal has been compared during a period of upwelling with remote sensing data for Chla, sea surface temperature, salinity, direction and intensity of both currents and winds. On the 11th February the in situ nutrients levels were high and the Chla was low, but by the 12th March the converse was the situation. The evolution of this event could be followed by combining remote sensing and model data from a variety of open source web sites made available by the Earth Observation provider that demonstrated clearly the lags between the physical forcings promoting upwelling and the eventual blooms of phytoplankton.
- Shorebirds assemblages as indicators of ecological status and sediment quality in the Ria Formosa lagoonPublication . Danchenko, Sergei A.; Newton, Alice; Ramos, Jaime AlbinoThe Ria Formosa lagoon is a site of international environmental importance, included into Natura 2000 Network, Ramsar Convention and European Water Framework Directive (WFD). This thesis focuses on the study of shorebird assemblages feeding on intertidal flats in relation with physical properties of the sediments, meiobenthos and macrobenthos communities. The study sites were presumably different in ecological status, both located close to the WFD intercalibration sites with defined ecological status. The study sites did not differ significantly by sediment granulometry, but differed in total organic content and redox potential of the sediment. Bird communities consisted of the same species but differed in relative densities between sites. No relation was found between bird densities and their benthic prey. The other habitat characteristics, tidal channels, disturbance of sediment by shellfishery and distance to roost sites, presence of complementary feeding sites influenced bird communities.