Changes in community structure of littoral fish along a salinity gradient

submitted by: Janica_Borg
The structure of a fish community is affected by its habitat. In the light of the current changes in the brackish Baltic Sea (i.e. sinking salinity and increasing eutrophication) we set out to examine exactly how the habitat affects the community structure. We sampled the littoral region of 32 sandy beaches situated along a gradient from inner to outer archipelago, with changing habitat parameters such as salinity, wave exposure, beach size and vegetation. Sampling was done in the northern...

Evidence of natural resistance of wild populations of invertebrates to acidic runoff from acid sulfate soils

submitted by: Valter_Amaral
Laboratory and field experiments showed that even short-term exposure of naïve oysters to acidic runoff from acid sulfate soils (ASS) can lead to increased mortality. How these results apply to wild populations of invertebrates is, however, unclear. Sessile organisms, such as oysters, or species with limited dispersion, such as gastropods, might experience strong selective pressures for tolerance to low pH when chronically exposed. Mobile species, such as crabs, may be capable of...

Coarse sediment habitats diversity in the eastern English Channel

submitted by: Sophie_Lozach
Previous to benthic habitat mapping, it is necessary to have a relevant habitat typology. Currently, EUNIS (European Nature Information System) is the reference in Europe, but it must be implemented by new observations, particularly for the more detailed levels of the classification in offshore coarse sediments which are, historically, less explored because of sampling difficulties. Numerous benthic sampling surveys have been implemented during the ten past years [BENTHOSEINE (1999),...

Marine mammals biodiversity in the Thracian Sea (North Aegean Sea - Greece) during the period 1997-2010.

submitted by: Cristina_Milani

After preliminary marine and land surveys conducted between 1997 and 2004, first scientific dedicated boat surveys have been running since 2005 in the northern part of the North Aegean Sea, known as Thracian Sea, in Greece. 174 dedicated surveys in the study area were undertaken for a total of 1042 hours and covering an area of about 1600 km2.

Where and whence naticid to drill: possible ecological implications

submitted by: Dmitry_Aristov

Naticid gastropod mollusk Amauropsis islandica in the White Sea intertidal feeds on clams Macoma balthica boring their thin shells. In these habitats, predators can possibly influence size structure of Macoma by eliminating bigger clams. Our previous investigations showed weak predators-prey size correlations, contrary to some literature data (i.e. Kingsley-Smith et al, 2003; Quijon et al, 2007).

Meiobenthic diversity from tropical and temperate sandy beaches

submitted by: Katerina_Sevastou

Meiobenthic data from 13 tropical (Galapagos Islands) and 10 subtropical (Crete, Eastern Mediterranean) sandy beaches were used for exploring differences in diversity patterns between temperate and tropical areas. Nematodes dominated in terms of abundance at most of the tropical beaches (highest dominance 94%), whereas, copepods predominated in the temperate area, more pronouncedly in exposed conditions where in some cases they exceeded 90%.