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Long term variation of an amphipod species’ population secondary production as ...

During the last decades many estuaries underwent ranges of environmental pressure due to increasing anthropogenic pressures and the undertaken of mitigation measures to prevent the impoverishment of these areas. The Mondego estuary (NW Atlantic coast of Portugal), a mesotidal shallow estuary, is one typical case of this. In the 1980s, the system was characterized by rich and stable animal and vegetal communitie...

Predicting the variation in Echinogammarus marinus at its southernmost limits u...

Understanding the environmental parameters that constrain the distribution of a species at its latitudinal extremes is critical for predicting how ecosystems react to climate change. Our first aimwas to predict the variation in the amphipod populations of Echinogammarus marinus from the southernmost limit of its distribution under global warming scenarios. Our second aim was to test whether sex-ratio fluctuatio...

Consumption and feeding preference of Echinogammarus marinus on two different a...

Echinogammarus marinus constitutes the most abundant amphipod species in Fucus spp. assemblages from many North Atlantic estuaries. However, there are some doubts about the real use of fucoids by the amphipod. Whilst some studies report the ingestion of Fucus vesiculosus by E. marinus, others suggest that the amphipod preference for fucoids is mostly related to sheltering rather than feeding, due to the high ph...

Population ecology and habitat preferences of juvenile flounder Platichthys fle...

The European flounder Platichthys flesus is a widely distributed epibenthic species and an important component of demersal fish assemblages in the European Atlantic coastal waters. In Portuguese estuaries, this species reaches high densities, especially in Minho estuary (NW Iberian Peninsula, Europe), potentially playing an important role in the system's ecology. In this context, the population structure, produ...

Reação de genótipos de maracujazeiro-amarelo ao Colletotrichum gloeosporioides

O presente trabalho foi desenvolvido em casa de vegetação, na Estação Biológica da Universidade de Brasília, com objetivo de avaliar genótipos de maracujazeiro-amarelo frente ao fungo C. gloeosporioides, agente causal da antracnose. Para inoculação dos genótipos, utilizou-se uma suspensão contendo 5x10(6) esporos/mL do patógeno, depositados sobre ferimentos preestabelecidos com auxílio de escova de aço de cerda...

Reação de genótipos de maracujazeiro-amarelo ao Colletotrichum gloeosporioides

O presente trabalho foi desenvolvido em casa de vegetação, na Estação Biológica da Universidade de Brasília, com objetivo de avaliar genótipos de maracujazeiro-amarelo frente ao fungo C. gloeosporioides, agente causal da antracnose. Para inoculação dos genótipos, utilizou-se uma suspensão contendo 5x106 esporos/mL do patógeno, depositados sobre ferimentos preestabelecidos com auxílio de escova de aço de cerdas ...

Size-dependent variations on the nutritional pathway of Bathymodiolus azoricus ...

Bathymodiolus azoricus is a mussel from vent fields in the south-west of the Azores Triple Junction (Mid-Atlantic Ridge-MAR). Experimental evidence indicates that B. azoricus is a mixotrophic organism, which obtains energy from a dual endosymbiosis and filter-feeding. Yet the relative contribution of symbiosis and filter-feeding to B. azoricus nutrition is still unclear. To address this question, we developed a...

Impacts of macroalgal spores on the dynamics of adult macroalgae in a eutrophic...

A model describing macroalgal early life stages and adult dynamics was used to quantify the effects of non-adult forms on the productivity of adult macroalgae in a eutrophic estuary. Predictions indicate that during years with mild winters and low rainfall, spring blooms will occur at the expense of the growth and reproduction of overwintering adults and without the contribution of the spore bank. In these circ...

Esporulação de Colletotrichum gloeosporioides em meios líquidos

Significant variations in the productivity of green macroalgae in a mesotidal e...

A spatially dynamic model for the productivity of spores and adults of green macroalgae (Enteromorpha sp.) was developed for a mesotidal estuary (Mondego estuary, Portugal). Many of the algal processes and parameters included in the model were experimentally obtained. Model predictions were compared to a real time series (1993-1997) of macroalgal biomass variation and the two sets show a good agreement (ANOVA, ...