A quarter-century of nutrient load reduction leads to halving river nutrient fluxes and increasing nutrient limitation in coastal waters of central Japan
The response of various water quality parameters on nutrient load reduction in shallow lakes is often non-linear, because of the many different ecological interactions involved. In order to get insight into this, a mathematical model is presented combining a description of the internal nutrient cycles with a food-web approach. Different applications of the model are discussed: combined calibration on a multi-lake data set, and a study on the effects of increasing vs. decreasing loading on the water quality in an “average shallow lake”. The model has also been used to evaluate different restoration scenarios in several lakes in The Netherlands.
A new species of diogenid hermit crab, Diogenes minimus, is described and illustrated on the basis of material from shallow subtidal waters (5–19 m) in central Japan. It appears close to D. holthuisi Asakura & Tachikawa, 2010, but easily distinguished from the latter by the shape of the antennal acicle, non-elongate male left cheliped and the armature of the right cheliped merus. Including the new species, 14 identified species of Diogenes are now known from Japanese waters. A brief overview on species of Diogenes recorded from Japanese waters is given.
Carbon and nutrient recycling ecotechnologies in three Baltic Sea river basins – the effectiveness in nutrient load reduction