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Importance of marine prey to growth of estuarine tern chicks: evidence from an ...
Paiva, Vitor H.; Ramos, Jaime A.; Machado, Daniel; Penha-Lopes, Gil; Bouslama, Mohamed Fadhel; Dias, Nuno; Nielsen, SørenWe assessed the effects of quality and quantity of prey species on the growth of Little Tern Sterna albifrons chicks raised in salinas (salt-pans), Algarve, Portugal. An energetic balance model was developed, which estimated the total amount of energy ingested by all chicks in a nest and the energy expenditure by the chicks when either growing alone or in groups of two and three per nest. Energy intake per chic...
Impact of eutrophication and river management within a framework of ecosystem t...
Marques, João C.; Nielsen, Søren N.; Pardal, Miguel A.; Jørgensen, Sven E.Eutrophication became a dominant process in the Mondego estuarine system in the 1980s, presumably as a result of excessive nutrient release into coastal waters. The main symptoms were the occurrence of seasonal blooms of Enteromorpha spp., green macroalgae, and a drastic reduction of the Zostera noltii meadows. Previous results suggest that this process will determine changes in species composition at other tro...
Structural changes in an estuary, described by models and using exergy as orientor
Jørgensen, Sven Erik; Marques, João; Nielsen, Søren NorsIt is often of interest to determine which structure of an ecosystem among the possible ones will prevail under given environmental circumstances. The authors show that it is feasible using models and an exergy index. The hypothesis is that the structure giving the highest exergy will prevail. The exergy calculations are however still very uncertain, which implies that a clear difference in exergy must be requi...
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